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Journal articles on the topic 'PVPP'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

O.M., Vergun, Rakhmetov D.B., Rakhmetova S.O., and Fishchenko V.V. "The content of nutrients and energetic value of the plant raw material of switchgrass (Panicum virgatum L.) genotypes." Plant Introduction 80 (December 1, 2018): 82–88. https://doi.org/10.5281/zenodo.2576109.

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<strong>Objective </strong>– to investigate biochemical properties of plant raw material of 1 cultivar and 14 varieties of <em>Panicum virgatum</em> L. in conditions of M.M. Gryshko National Botanical Garden of the NAS of Ukraine. <strong>Material and methods.</strong> Investigated plants were 1 cultivar and 14 varieties of <em>Panicum virgatum</em> collected in an experimental collection of Cultural Flora Department of National Botanical Garden of the NAS of Ukraine: <em>Panicum virgatum</em> f. <em>DB </em>(PVDB), <em>P. virgatum</em> f. <em>DN </em>(PVDN), <em>P. virgatum</em> f. <em>

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Mrković, Dragan, Perica Perić, and Božidar Marić. "Hybrid Generation of Existing Wind Power Plants with Additional Installation of Photovoltaic Power Plants." B&H Electrical Engineering 17, no. 2 (2023): 1–6. http://dx.doi.org/10.2478/bhee-2023-0006.

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Abstract The paper describes the possibility of hybrid electricity generation in already existing wind power plants (WPP) by additional installation of photovoltaic power plants (PVPP) on individual wind turbines (WT). Wind turbines have the lowest generation of electricity in the summer months, while PVPPs have the opposite, the highest generation in those months. Connecting the PVPP to the existing WT (hybrid electricity generation) brings a more even generation and a greater degree of use of the infrastructure of the existing wind farms (HV/MV transformer station, medium voltage cable distr

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Al-Shetwi, Ali Q., M. A. Hannan, Ker Pin Jern, Ammar A. Alkahtani, and A. E. PG Abas. "Power Quality Assessment of Grid-Connected PV System in Compliance with the Recent Integration Requirements." Electronics 9, no. 2 (2020): 366. http://dx.doi.org/10.3390/electronics9020366.

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The generation and integration of photovoltaic power plants (PVPPs) into the utility grid have increased dramatically over the past two decades. In this sense, and to ensure a high quality of the PVPPs generated power as well as a contribution on the power system security and stability, some of the new power quality requirements imposed by different grid codes and standards in order to regulate the installation of PVPPs and ensure the grid stability. This study aims to investigate the recent integration requirements including voltage sag, voltage flicker, harmonics, voltage unbalance, and freq

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Cosme, F., S. S. Ferreira, A. S. Alves, L. Filipe-Ribeiro, and F. M. Nunes. "Recycling of PVPP used in the wine industry: An opportunity for obtaining reusable PVPP and bioactive phenolic compounds." BIO Web of Conferences 15 (2019): 02020. http://dx.doi.org/10.1051/bioconf/20191502020.

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Polyvinylpolypyrrolidone (PVPP) is a synthetic water insoluble polymer produced by cross-linking of polyvinylpyrrilidone. It is used as a fining agent in the wine industry for removing low molecular weight phenolic compounds. There are no available data on the worldwide use of PVPP in the wine industry; nevertheless, its estimated use in Portugal in 2016 for white wine fining was nearly 147 tons. Used PVPP ends up on the municipal wastewater treatment plants, and as it contains significant quantities of adsorbed polyphenols it has a detrimental environmental impact. Recycling of PVPP for obtai

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Wang, Song, and Chengcheng Tian. "Polyvinylpolypyrrolidone Supported Brønsted Acidic Catalyst for Esterification." International Journal of Polymer Science 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/8104838.

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A polyvinylpolypyrrolidone (PVPP) supported Brønsted acidic catalyst ([PVPP-BS]HSO4) was prepared by coupling SO3H-functionalized polyvinylpolypyrrolidone with H2SO4in this work. After the characterization through FT-IR, FESEM, TG, BET, and elemental analysis, it was found that 1,4-butane sultone (BS) and sulfuric acid reacted with PVPP and were immobilized on PVPP surface. The prepared[PVPP-BS]HSO4catalyst shows high catalytic activity for a series of esterification reactions and could be separated from the reacted mixture easily. Moreover, this catalyst could be recycled and reused for six t

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Díaz, Nelson, Pedro M. Aqueveque, Alejandro Vallejos-Almirall, Rudi Radrigán, María C. Zúñiga-López, and Christian Folch-Cano. "Antioxidant Compound Adsorption in Polyvinylpolypyrrolidone from Chilean Carménère, Cabernet Sauvignon, and Merlot Grape Pomaces as Potential By-Products." Antioxidants 11, no. 10 (2022): 2017. http://dx.doi.org/10.3390/antiox11102017.

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Grape pomace (GP) is a by-product resulting from the winemaking process and its potential use as a source of bioactive compounds is well known. The GP bioactive compounds can be retained in the well-known polyvinylpolypyrrolidone (PVPP), industrially used in the clarification and stabilization of wine and other drinks. Thus, the polyphenolic compounds (PC) from the Chilean Carménère, Cabernet Sauvignon, and Merlot GP were extracted, and their compositions and antioxidant capacities (ORAC-FL) were determined. In addition, the retention capacity of the PC on PVPP (PC-PVPP) was evaluated. The bio

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Al-Shetwi, Ali Q., Walid K. Issa, Raed F. Aqeil, et al. "Active Power Control to Mitigate Frequency Deviations in Large-Scale Grid-Connected PV System Using Grid-Forming Single-Stage Inverters." Energies 15, no. 6 (2022): 2035. http://dx.doi.org/10.3390/en15062035.

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Over the last few years, the number of grid-connected photovoltaic systems (GCPVS) has expanded substantially. The increase in GCPVS integration may lead to operational issues for the grid. Thus, modern GCPVS control mechanisms should be used to improve grid efficiency, reliability, and stability. In terms of frequency stability, conventional generating units usually have a governor control that regulates the primary load frequency in cases of imbalance situations. This control should be activated immediately to avoid a significant frequency variation. Recently, renewable distribution generato

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Zipprich, Alexander, Mauricio R. Loureiro-Silva, Irita D'Silva, and Roberto J. Groszmann. "The role of hepatic arterial flow on portal venous and hepatic venous wedged pressure in the isolated perfused CCl4-cirrhotic liver." American Journal of Physiology-Gastrointestinal and Liver Physiology 295, no. 1 (2008): G197—G202. http://dx.doi.org/10.1152/ajpgi.00190.2007.

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In cirrhosis, hepatic venous pressure gradient is used to measure portal venous and sinusoidal pressures, as well as drug-induced decreases of elevated pressures. The aim of this study was to investigate the influence of hepatic arterial flow (HAF) changes on portal venous perfusion (PVPP) and wedged hepatic venous pressure (WHVP). Normal and CCl4-cirrhotic rats were subjected to a bivascular liver perfusion with continuous measurements of PVPP, WHVP, and hepatic arterial perfusion pressure. Flow-pressure curves were performed with the use of different flows either through the portal vein (PVF

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Ranatunge, Imali, Subshini Adikary, Piumi Dasanayake, Chamira Dilanka Fernando, and Preethi Soysa. "Development of a Rapid and Simple Method to Remove Polyphenols from Plant Extracts." International Journal of Analytical Chemistry 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/7230145.

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Polyphenols are secondary metabolites of plants, which are responsible for prevention of many diseases. Polyvinylpolypyrrolidone (PVPP) has a high affinity towards polyphenols. This method involves the use of PVPP column to remove polyphenols under centrifugal force. Standards of gallic acid, epigallocatechin gallate, vanillin, and tea extracts(Camellia sinensis)were used in this study. PVPP powder was packed in a syringe with different quantities. The test samples were layered over the PVPP column and subjected to centrifugation. Supernatant was tested for the total phenol content. The presen

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Rozhnov, Evgeny, Alexey Kazarskikh, and Marina Shkolnikova. "Polyvinyl Polypyrrolidones Use for Stabilizing Phenol Compounds in the Sea Buckthorn Juices Production." Food Industry 5, no. 2 (2020): 37–43. http://dx.doi.org/10.29141/2500-1922-2020-5-2-5.

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The article discloses the specific use of polyvinylpolypyrrolidone (PVPP) in the sea buckthorn juices production. The authors obtained data on the PVPP use possibility for selective polyphenols sorption with low molecular weight leading to the oxidation tones appearance and non-enzymatic absorption in the sea buckthorn juices production. The research relevance is to develop a technological solution that allows preserving the attractive appearance of sea buckthorn juices and ensuring long-term products storage. The research objects were commercially available PVPP, especially Kollidon CL-M, Pla

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Čosić, Zrinka, Branka Levaj, and Mara Banović. "Utjecaj lakaze i polivinilpirolidona na kvalitetu i fenolni sastav vina Laški rizling." Glasnik zaštite bilja 43, no. 6 (2020): 100–109. http://dx.doi.org/10.31727/gzb.43.6.11.

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Fenolni spojevi su poželjan sastojak vina zbog njihovog dobro poznatog pozitivnog učinka na zdravlje ljudi, međutim zbog podložnosti oksidaciji, mogu negativno utjecati na boju, stabilnost te ukupnu kvalitetu bijelih vina. Sumporni dioksid, učinkovit antioksidans koji se koristi za stabilizaciju i sprječavanje posmeđivanja, izbjegava se zbog mogućeg štetnog utjecaja na zdravlje ljudi i kvalitetu vina. Stoga se koriste i istražuju druga sredstva kao npr. polivinilpolipirolidon (PVPP) i lakaza. PVPP je sintetski polimer koji veže fenolne spojeve i time sprječava njihovu oksidaciju. Nasuprot tome

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Antoce, Oana Arina, and George Adrian Cojocaru. "Effects of Pre-Fermentative Treatments with Non-Synthetic Ternary Component Fining Agents Based on Pea Protein on the Volatile Profiles of Aromatic Wines of Tămâioasă Românească." Beverages 10, no. 3 (2024): 81. http://dx.doi.org/10.3390/beverages10030081.

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To remove oxidizable polyphenolic compounds from wines, fining treatments with products of various origins are applied before or after fermentation. Seeking alternatives to the treatments with animal proteins or synthetic materials such as polyvinylpolypyrrolidone (PVPP), vegetal and mineral products are tested. One of these alternative agents is pea protein (P), which can be combined with chitosan (K), yeast cell walls (Y), active carbon (C), and/or Ca-bentonite (B). Aside from the proven polyphenol removal effect, these products can also have an impact on aroma. This research evaluates the e

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Zilic, Sladjana, Vesna Hadzi-Taskovic-Sukalovic, Dejan Dodig, Vuk Maksimovic, and Vesna Kandic. "Soluble free phenolic compound contents and antioxidant capacity of bread and durum wheat genotypes." Genetika 45, no. 1 (2013): 87–100. http://dx.doi.org/10.2298/gensr1301087z.

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The objective of this study was to determine phenolic compounds and the total antioxidant capacity in the grain of ten bread (T. aestivum L.) and ten durum (T. durum Desf.) wheat genotypes. Soluble free forms of total phenolics, flavonoids, PVPP (polyvinylpolypyrrolidone) bound phenolics, proanthocyanidins and phenolic acids were investigated. In addition, the correlation coefficients between total antioxidant capacities and the concentration of different soluble free phenolic compounds, as well as between soluble free total phenolics and phenolic acids, flavonoids and PVPP bound phenolics wer

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Lusiana, Retno Ariadi, Khabibi Khabibi, Rahmad Nuryanto, and Muhammad Ridho Shofwan Al Aziz. "Development and Characterization of a Chitosan and Polyvinyl Alcohol (CS/PVP)-Based Slow-Release Urea Fertilizer Membrane." Jurnal Kimia Sains dan Aplikasi 27, no. 10 (2024): 470–76. http://dx.doi.org/10.14710/jksa.27.10.470-476.

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A slow-release test of urea fertilizer was conducted using chitosan-urea (CS-U) and chitosan/polyvinyl pyrrolidone K30-urea (CS/PVP-U) membranes. The urea membrane synthesis involved a blending method, with PVP K30 added as a component. The slow-release capabilities of CS-U, CS/PVP1-U, CS/PVP2-U, CS/PVP3-U, and CS/PVP4-U membranes were compared. FTIR results showed an increased intensity of the primary NH double peak at 1587 cm-1 and 1640 cm-1, while the C=O spectrum shifted from 1640 to 1647 cm-1 and the -OH group from 3354 cm-1 to 3362 cm-1, indicating hydrogen bond formation in CS/PVP-U. XR

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15

Wang, Ying, Jiang Feng, Guo Ping Wang, Xian Guo Lv, and Xiao Yu Wang. "A Modified Protocol for Microbial DNA Extraction and Purification in Crude Oil-Spilled Marsh Soil." Applied Mechanics and Materials 340 (July 2013): 353–57. http://dx.doi.org/10.4028/www.scientific.net/amm.340.353.

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High level of humus existing in oil-spilled marsh soil could co-extract with DNA to inhibit PCR amplification. We established a stable DNA extracting protocol by modifying direct lysis and activated sludge DNA extracting procedures: with 0.1g/ml PVPP in extracting buffers to pretreat soils and three cycles of freeze-thawing treatment added, by employing lysozyme and 15% SDS, through reducing duration of water bath and digesting RNA with Rnase A before phenol/chloroform extraction. With high concentration of DNA, this protocol provided lower OD230/OD260 value and appropriate OD260/OD280 ratio,

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Malencic, Djordje, Biljana Kiprovski, Vojislava Bursic, Gorica Vukovic, Nikola Hristov, and Ankica Kondic-Spika. "Whole grain phenolics and antioxidant activity of Triticum cultivars and wild accessions." Journal of the Serbian Chemical Society 81, no. 5 (2016): 499–508. http://dx.doi.org/10.2298/jsc151021013m.

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Soluble free phenolics (SP), PVPP-bound tannins (PVPP-P), flavonoids (TF) and proanthocyanidins (PA) content, as well as the DPPH-radical scavenging capability of the whole grain of 17 different Triticum spp. accessions were analyzed. The content of SP ranged from 976 to 2927 ?g CE/g, while PVPP-P ranged from 335 to 1412 ?g CE/g and TF from 0.16 to 1.12 ?g RE/g of dry whole grain. The presence of PA in the whole grains has not been established. The values for DPPH-radical scavenging activity were rather moderate, under 40 % of neutralized radicals. A positive correlation between DPPH-activity

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Wang, Yifei, Zhisheng Wu, Zhaoyi Wang, Manfei Xu, Xinyuan Shi, and Yanjiang Qiao. "Rapid analysis of spatial distribution of PVPP and hardness of Yinhuang dispersible tablets by NIR-CI." Journal of Innovative Optical Health Sciences 09, no. 02 (2016): 1550016. http://dx.doi.org/10.1142/s1793545815500169.

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The present study aimed at investigating the relationship between tablet hardness and homogeneity of different Yinhuang dispersible tablets by near-infrared chemical imaging (NIR-CI) technology. The regularity of best hardness was founded between tablet hardness and the spatial distribution uniformity of Yinhuang dispersible tablets. The ingredients homogeneity of Yinhuang dispersible tablets could be spatially determined using basic analysis of correlation between analysis (BACRA) method and binary image. Then different hardnesses of Yinhuang dispersible tablets were measured. Finally, the re

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Lusiana, Retno Ariadi, Riska Nurfida Annisa, Vinsencius Guntur Pandu Marcellino, Didik Setiyo Widodo, and Hasan Muhtar. "Fabrication and Characterization of Chitosan-Polyvinyl Pyrolidone K-30 for Creatinine Transport Membranes." Jurnal Kimia Sains dan Aplikasi 26, no. 10 (2023): 381–90. http://dx.doi.org/10.14710/jksa.26.10.381-390.

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The investigation of membrane-based hemodialysis is an interesting study due to its efficacy in eliminating metabolic waste compounds, such as creatinine, from the body. However, not all membrane types exhibit optimal transport capabilities, necessitating modifications. In this study, we conducted modifications on chitosan (CS) membranes by incorporating polyvinyl pyrrolidone K-30 (PVP K-30) and assessing their physicochemical characteristics. The modified membrane underwent characterization and subsequent evaluation of its transport capabilities. The primary objective of this research is to d

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Mutluay Ünal, Server. "A comparison of the effect of different forms of Graphene and Polyvinylpyrrolidone on physically strengthening PMMA." International Dental Research 12, no. 2 (2022): 62–69. http://dx.doi.org/10.5577/intdentres.2022.vol12.no2.4.

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Aim: The aim of this study was to compare the effects of powder, mat, and sheet forms of graphene and polyvinylpyrrolidone (PVP) on the bending strength of polymethyl methacrylate (PMMA). Methodology: A total of 75 PMMA samples (64 x 13 x 3 mm) were obtained and separated into five groups of 15, one of which was the control group. No strengthening material was added to the control group samples. In the PMMA+Polyvinylpyrrolidone powder (PVPP) (Group B) and PMMA+Graphene powder (GP) groups (Group D), PVP (0.5%) and graphene (0.01%) powders, respectively were added to the PMMA. In the PMMA+Polyvi

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Takekuma, Yoh, Haruka Ishizaka, Masato Sumi, Yuki Sato, and Mitsuru Sugawara. "Difference in the Dissolution Behaviors of Tablets Containing Polyvinylpolypyrrolidone (PVPP) Depending on Pharmaceutical Formulation After Storage Under High Temperature and Humid Conditions." Journal of Pharmacy & Pharmaceutical Sciences 19, no. 4 (2016): 511. http://dx.doi.org/10.18433/j3hw3q.

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PURPOSE. Storage under high temperature and humid conditions has been reported to decrease the dissolution rate for some kinds of tablets containing polyvinylpolypyrrolidone (PVPP) as a disintegrant. The aim of this study was to elucidate the properties of pharmaceutical formulations with PVPP that cause a decrease in the dissolution rate after storage under high temperature and humid conditions by using model tablets with a simple composition. METHODS. Model tablets, which consisted of rosuvastatin calcium or 5 simple structure compounds, salicylic acid, 2-aminodiphenylmethane, 2-aminobipheny

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Rihak, Zdenek, Bozena Prusova, Kamil Prokes, and Mojmir Baron. "The Effect of Different Fining Treatments on Phenolic and Aroma Composition of Grape Musts and Wines." Fermentation 8, no. 12 (2022): 737. http://dx.doi.org/10.3390/fermentation8120737.

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The study evaluated the effect of different fining treatments such as oenological additives and the influence of oxygen and hyperoxygenation on the phenolic and aroma composition of grape musts and wines. The oxidative method, hyperoxygenation and fining agents polyvinyl polypyrrolidone (PVPP), pea protein and chitosan were used for the removal of phenolic compounds compared to the control experiment. The content of phenolic substances was determined by high performance liquid chromatography. A total of 24 volatiles—higher alcohols, ethyl esters and acetate esters were determined using gas chr

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Oleksandr, KOLLAROV, and Ostrenko Dmytro. "Application of Classical Machine Learning Methods for Forecasting Energy Generation Volumes Using Photovoltaic Power Plants." Journal of Electrical and power engineering 30, no. 1 (2024): 72–79. http://dx.doi.org/10.31474/2074-2630-2024-1-72-79.

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This work is dedicated to the application of classical machine learning methods for forecasting energy generation volumes using photovoltaic power plants (PVPPs). The primary focus of this work is on using machine learning algorithms such as SVM and random forest to model and predict energy production based on data collected from PVPP sensors and inverters. Accurate energy generation forecasting is crucial for efficient energy system management, particularly for demand balancing, maintenance planning, and resource optimization. The choice of machine learning algorithms is motivated by their ab

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Oliveira, Lorena Mayana Beserra de, Claudia Maria Leal Bevilaqua, Iara Tersia Freitas Macedo, et al. "Effect of six tropical tanniferous plant extracts on larval exsheathment of Haemonchus contortus." Revista Brasileira de Parasitologia Veterinária 20, no. 2 (2011): 155–60. http://dx.doi.org/10.1590/s1984-29612011000200011.

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Tanniferous plants represent a promising alternative for controlling gastrointestinal nematodes of small ruminants. This experiment evaluated the effects of extracts from the leaf and stem of Anadenanthera colubrina, Leucaena leucocephala and Mimosa tenuiflora on larval exsheathment of Haemonchus contortus in vitro and verified the role of tannins in this process. Third-stage larvae of H. contortus were incubated with extracts for 3 hours and were exposed to sodium hypochlorite solution. The extracts were tested at 300 µg.mL-1 and accompanied by controls: phosphate buffer solution (PBS) and po

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Gencer, Altan. "Low Voltage Ride-Through Improvement of a Grid-Connected PV Power System Using a Machine Learning Control System." Applied Sciences 15, no. 8 (2025): 4251. https://doi.org/10.3390/app15084251.

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The insufficient durability of solar energy systems is an important problem in low-voltage situations in the electrical grid. This problem can cause PV systems to become difficult to operate during periods of low voltage and may disconnect PV systems from electrical grids. In this study, a hybrid protection system combining a DC chopper and a capacitive bridge fault current limiter (CBFCL) and based on a machine learning (ML) approach is proposed as a protection strategy to improve the low voltage ride-through (LVRT) capability of a grid-connected PV power plant (PVPP) system. To forecast the

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Nozella, Eduardo F., Sergio L. S. Cabral Filho, Ives C. S. Bueno, Adibe L. Abdalla, and Dorinha M. S. S. Vitti. "Tannin contents and in vitro digestibility of Brazilian browses." Proceedings of the British Society of Animal Science 2002 (2002): 133. http://dx.doi.org/10.1017/s1752756200007894.

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Brazil has arid regions where livestock production is limited by forage source. However, some native herbaceous legumes have a dry tolerance and had been used as animal feed. Some of those plants have anti nutritional compounds such as tannins that and can interfere on intake and digestibility of these plants. Tannins have a high affinity with proteins and could make these molecules unavailable for animal. Compounds as polyvinylpolypyrrolidone (PVPP) have been used on tannin studies, because it has more affinity with tannins than proteins. Based on that, it is possible to evaluate the nutritiv

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Lindemann, Martin, Cornelia Rieder-Gradinger, Thomas Kuncinger, and Ewald Srebotnik. "Selective recovery of polyphenols from MDF process waters by adsorption on a macroporous, cross-linked pyrrolidone-based resin." Holzforschung 74, no. 2 (2020): 217–25. http://dx.doi.org/10.1515/hf-2018-0229.

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AbstractA scalable, fixed-bed adsorption system for the removal and selective recovery of polyphenols (lignans and stilbenes) from medium-density fiberboard (MDF) process waters was developed. Before adsorption, fibers and non-colloidal substances were removed from process water by centrifugation, while colloidal fatty and resin acids were removed by filtration through a 30-kDa cut-off membrane. Polyphenols were then isothermally adsorbed on a medium-pressure liquid chromatography (MPLC) column packed with Divergan® RS, a regenerable macroporous, cross-linked pyrrolidone-based [polyvinylpolypy

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Anyanwu, Nneoma C. J., Lakmini S. Premadasa, Wasifa Naushad, Bryson C. Okeoma, Mohan Mahesh, and Chioma M. Okeoma. "Rigorous Process for Isolation of Gut-Derived Extracellular Vesicles (EVs) and the Effect on Latent HIV." Cells 14, no. 8 (2025): 568. https://doi.org/10.3390/cells14080568.

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The human gastrointestinal (GI) track host trillions of microorganisms that secrete molecules, including extracellular vesicles (EVs) and extracellular condensates (ECs) that may affect physiological and patho-physiological activities in the host. However, efficient protocols for the isolation of pure and functional GI-derived EVs|ECs is lacking. Here, we describe the use of high-resolution particle purification liquid chromatography (PPLC) gradient-bead-column integrated with polyvinylpolypyrrolidone (PVPP)-mediated extraction of impurities to isolate EVs from colonic content (ColEVs). PVPP f

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Liu, Jinbo, Lijuan Duan, Jian Chen, Jingan Shang, Bin Wang, and Zhaoguang Pan. "A Cooperative Operation Strategy for Multi-Energy Systems Based on the Power Dispatch Meta-Universe Platform." Electronics 13, no. 15 (2024): 3015. http://dx.doi.org/10.3390/electronics13153015.

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To meet the challenges of renewable energy consumption and improve the efficiency of energy systems, we propose an intelligent distributed energy dispatch strategy for multi-energy systems based on Nash bargaining by utilizing the power dispatch meta-universe platform. First, the operational framework of the multi-energy system, including wind park (WP), photovoltaic power plant (PVPP), and energy storage (ES), is described. Using the power dispatch meta-universe platform, the models of WP, PVPP, and ES are constructed and analyzed. Then, a Nash bargaining model of the multi-energy system is b

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Bertrand Azando, Erick Virgile, Abiodoun Pascal Olounladé, and Mawulé Sylvie Hounzangbé-Adoté. "Les Tanins et les Flavonoïdes dans l'Activité Anthelminthique in Vivo et in Vitro de Newbouldia Laevis et Zanthoxylum Zanthoxyloïdes sur les Vers Adultes de Haemonchus Contortus." European Scientific Journal, ESJ 18, no. 40 (2022): 328. http://dx.doi.org/10.19044/esj.2022.v18n40p328.

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Aux fins de déterminer in vitro et in vivo la part des tanins et des flavonoïdes dans l’activité anthelminthique de Newbouldia laevis et Zanthoxylum zanthoxyloïdes (Fagara zanthoxyloïdes) sur les vers adultes de H. contortus, des ovins Djallonké infestés par H. contortus ont été traités ad libitum avec des feuilles fraiches de Z. zanthoxyloïdes associées ou non à un inhibiteur de tanins, le poly éthylène glycol (PEG) sur 7 jours consécutifs. Des vers adultes de H. contortus ont été également mis en contact d’extraits de N. laevis et Z. zanthoxyloïdes en présence ou non de polyvinyle polypyroll

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Cervelli, Robert. "In Vitro Propagation of Aconitum noveboracense and Aconitum napellus." HortScience 22, no. 2 (1987): 304–5. http://dx.doi.org/10.21273/hortsci.22.2.304.

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Abstract Shoot proliferation in vitro of a threatened species, northern monkshood (Aconitum noveboracense Gray), and of common European monkshood (A. napellus L.) was achieved using growth chamber-grown stem nodes cultured on Gelrite-solidified MS medium supplemented with 4.5 μM BA, whereas rooting occurred when BA levels were <3.4 μM. Problems with phenol oxidation and its diffusion into the medium were circumvented with addition of 0.1μM citric acid and 500 mgliter−1 PVPP. The use of 60 μM rifampicin provided effective control of most bacterial contaminants. Nonchimeric albino foliage was

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Buczek, Józef. "The occurence of a nitrate reductase inactivating factor in extracts of Spirodela polyrrhiza." Acta Societatis Botanicorum Poloniae 53, no. 3 (2014): 411–17. http://dx.doi.org/10.5586/asbp.1984.036.

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NADH-nitrate reductase (NR) had a low activity immediately after extraction from 14 day-old cultures of <em>Spirodela polyrrhiza</em> with the basic extraction solution (50 mM K-phosphate buffer, pH 7.5, 5 mM cysteine and 3 mM EDTA) whereas nitrite reductase (NiR) activity in the same extract was very high. Increasing the EDTA or cysteine concentration or replacing cysteine by dithiothreitol had no effect on the level of NR activity. The addition of 3% bovine serum albumine (BSA) and 0.4 mM phenylmethyl sulfonyfluoride (PMSF) or 3% BSA and 1.5% polyvinylpolypyrrolidone (PVPP) to th

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Wang, Song, Lanlan Xu, Linlin Xu, Chengcheng Tian, and Yinyan Guan. "Optimization of Process Variables in the Synthesis of Tributyl Citrate Using a Polyvinylpolypyrrolidone-Supported Brønsted Acidic Ionic Liquid Catalyst." International Journal of Polymer Science 2018 (July 15, 2018): 1–9. http://dx.doi.org/10.1155/2018/1953563.

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A polyvinylpolypyrrolidone- (PVPP-) supported Brønsted acidic ionic liquid catalyst ([BsPVPP]HSO4) was synthesized by the reaction between SO3H-functionalized PVPP and H2SO4. The prepared catalyst was characterized by IR, XRD, FESEM, TG, and DSC. The catalytic activity of [BsPVPP]HSO4 in the preparation of tributyl citrate (TBC) by the esterification reaction between citric acid and n-butanol was investigated. Response surface methodology (RSM) was applied to optimize the process variables of the esterification reaction. The variables, including the reaction time, the n-butanol-to-citric acid

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Markovic, Romeo, Olgica Grujic, and Jelena Pejin. "Conventional and alternative principles for stabilization of protein and polyphenol fractions in beer." Acta Periodica Technologica, no. 34 (2003): 3–12. http://dx.doi.org/10.2298/apt0334003m.

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Beer haze is primarily formed through complexation of protein and polyphenolic beer ingredients. The problem of reducing susceptibility of beer haze formation can be done either by lowering protein and/or polyphenol levels, or by minimizing the molecular size of protein/polyphenols. In experimental part of this work the shelf life of unstabilized beer is being compared with beer stabilized with various standard products, such as PVPP and silica gel. Furthermore, the trials have been made to prove the functionality of a new product consisting of carrageenan and cross-linked PVPP. The method use

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Huang, Jing, Xiangkai Fu, and Qiang Miao. "Retraction: Synthesis of a novel type of chiral salen Mn(iii) complex immobilized on crystalline zinc poly(styrene-phenylvinylphosphonate)-phosphate (ZnPS-PVPP) as effective catalysts for asymmetric epoxidation of unfunctionalized olefins." Catalysis Science & Technology 11, no. 11 (2021): 3931. http://dx.doi.org/10.1039/d1cy90048j.

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Retraction for ‘Synthesis of a novel type of chiral salen Mn(iii) complex immobilized on crystalline zinc poly(styrene-phenylvinylphosphonate)-phosphate (ZnPS-PVPP) as effective catalysts for asymmetric epoxidation of unfunctionalized olefins’ by Jing Huang et al., Catal. Sci. Technol., 2011, 1, 1472–1482, DOI: 10.1039/C1CY00285F

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Bilko, Marina, Sergiy Gunko, Iryna Babych, et al. "Investigation of the appearance and elimination of pinking coloration in white wines." Eastern-European Journal of Enterprise Technologies 1, no. 11(115) (2022): 56–62. http://dx.doi.org/10.15587/1729-4061.2022.252472.

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Investigation of the appearance and elimination of “pinking” phenomenon in white wines is presented in the paper. Several factors that can cause pinking were analyzed: the degree of grapes ripeness and enzymatic treatment. The effect of fining agents based on polyvinylpolypyrrolidone (PVPP) on the elimination of “pinking” was determined. It was proved that pinking in wines decreases with an increase in the sugar content in grape. This is explained by a decrease in the content of anthocyanins at the end of technical ripeness of grape. Experimental studies confirmed that the use of pectolytic en

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Abdullahi, Aliyu Dantani, Kridsada Unban, Chalermpong Saenjum, et al. "Antibacterial activities of Miang extracts against selected pathogens and the potential of the tannin-free extracts in the growth inhibition of Streptococcus mutans." PLOS ONE 19, no. 5 (2024): e0302717. http://dx.doi.org/10.1371/journal.pone.0302717.

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Bacterial pathogens have remained a major public health concern for several decades. This study investigated the antibacterial activities of Miang extracts (at non-neutral and neutral pH) against Bacillus cereus TISTR 747, Escherichia coli ATCC 22595, Salmonella enterica serovar Typhimurium TISTR 292 and Streptococcus mutans DMST 18777. The potential of Polyvinylpolypyrrolidone (PVPP)-precipitated tannin-free Miang extracts in growth-inhibition of the cariogenic Streptococcus mutans DMST 18777 and its biofilms was also evaluated. The tannin-rich fermented extracts had the best bacterial growth

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Marina, Bilko, Gunko Sergiy, Babych Iryna, et al. "Investigation of the appearance and elimination of pinking coloration in white wines." Eastern-European Journal of Enterprise Technologies 1, no. 11(115) (2022): 56–62. https://doi.org/10.15587/1729-4061.2022.252472.

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Investigation of the appearance and elimination of “pinking” phenomenon in white wines is presented in the paper. Several factors that can cause pinking were analyzed: the degree of grapes ripeness and enzymatic treatment. The effect of fining agents based on polyvinylpolypyrrolidone (PVPP) on the elimination of “pinking” was determined. It was proved that pinking in wines decreases with an increase in the sugar content in grape. This is explained by a decrease in the content of anthocyanins at the end of technical ripeness of grape. Experimental studies  confirmed

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Mokhtary, Masoud, and Faranak Najafizadeh. "Polyvinylpolypyrrolidone-Supported Boron Trifluoride; Highly Efficient Catalyst for the Synthesis ofN-tert-Butyl Amides." E-Journal of Chemistry 9, no. 2 (2012): 576–82. http://dx.doi.org/10.1155/2012/632574.

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Highly efficient method for the preparation ofN-tert-butyl amides by reaction of nitriles withtert-butyl acetate is described using polyvinylpolypyrrolidone-supported boron trifluoride (PVPP-BF3) at 70°C in good to excellent yields. Selective amidation of benzonitrile in the presence of acetonitrile was also achieved. polyvinylpolypyrrolidone-boron trifluoride complex shows non-corrosive and stable solid catalyst elevated Lewis acid property.

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Laborde, Bénédicte, Virginie Moine-Ledoux, Tristan Richard, Cédric Saucier, Denis Dubourdieu, and Jean-Pierre Monti. "PVPP−Polyphenol Complexes: A Molecular Approach." Journal of Agricultural and Food Chemistry 54, no. 12 (2006): 4383–89. http://dx.doi.org/10.1021/jf060427a.

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Hanh, Nguyen Thi, Nguyen Thi Trang, Nguyen Thi Minh Anh, et al. "Detannying in Cashew Apple Juice (Anacardium occidentale L.) by Chemical Agents." Current Research in Nutrition and Food Science Journal 12, no. 3 (2024): 1211–21. https://doi.org/10.12944/crnfsj.12.3.17.

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Vietnam is the leading exporter of cashew nuts globally; however, the cashew apple, constituting 75% of the total harvest from cashew trees, remains underexploited despite its rich nutrient content. The main reason is that cashew apple contains high amount of tannin which causes astringency. Consequently, this undesired compound poses a significant challenge for food product development. Thus, tannin removal is critical in cashew apple juice processing to improve sensorial characteristic and produce a nutritious beverage from cashew apple. Gelatin, modified cassava starch (MCS), and polyvinyl

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AISSA, A., F. MANOLARAKI, H. BEN SALEM, H. HOSTE, and K. KRAIEM. "In vitroassessment of the anthelmintic activity ofHedysarum carnosumDesf. at different phenological stages and from six locations in Tunisia." Parasitology 143, no. 6 (2016): 778–86. http://dx.doi.org/10.1017/s0031182016000317.

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SUMMARYGastrointestinal nematodes are compromising productivity of grazing sheep and goats. Therefore, scientists have been looking for cost-effective alternative options. Forage legumes (Fabacea Family) contain tannins that could improve livestock performance and their health as well. The present study aimed to (i) determine thein vitroanthelmintic (AH) activity of 19 acetonic extracts ofHedysarum carnosumDesf onHaemonchus contortusby a larval exsheathment assay (LEA); (ii) test the anthelmintic activity of condensed tannins using a deactivating reagent, polyvinylpolypyrrolidone (PVPP); (iii)

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Song, Guocheng, Jing Li, Junrong Yu, Yan Wang, Jing Zhu, and Zuming Hu. "High Performance Microfiltration Composite Membranes Based on Phenolphthalein Poly(ether sulfone) Nanofibrous Substrate with Hydrophilic Coating." Journal of Nanoscience and Nanotechnology 19, no. 6 (2019): 3495–504. http://dx.doi.org/10.1166/jnn.2019.16035.

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In the present paper, Phenolphthalein poly(ether sulfone) (PES-C) nanofibrous membranes were prepared via solution-blowing technology and polyvinylpyrrolidone (PVP) which would be converted to stable gels by reaction with potassium persulfate (K2S2O8) was immobilized on the surface of nanofibers. The influence factors such as PVP concentration and depositing time were optimized to obtain the composite nanofibrous membranes. The membranes were characterized by Scanning electron microscopy (SEM), Fourier transform infrared (FTIR), Wide-angle X-ray diffraction (WAXD), X-ray photoelectron spectros

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Vendramin, Veronica, Daniele Pizzinato, Céline Sparrow, et al. "Prevention of quercetin precipitation in red wines: a promising enzymatic solution." OENO One 56, no. 1 (2022): 41–51. http://dx.doi.org/10.20870/oeno-one.2022.56.1.4699.

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Flavonols are known for causing undesirable deposits in both red and white wines. Among flavonols, quercetin is widely considered the principal factor determining this phenomenon. One of the most accredited hypotheses claims that glycosylated derivatives of quercetin undergo hydrolysis of the glycosylic bond during the fermentation and the wine ageing, releasing quercetin aglycone, which is much less soluble in water solution and causes the precipitation. Our work describes the dynamics of quercetin-derived deposition in Chianti wines and purposes a new method, based on the enzymatic quercetin

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Puskas, Vladimir, and Uros Miljic. "Effects of fining on phenolic compounds and colour of red wine obtained with addition of increased amounts of grape solid phase in pomace." Chemical Industry 66, no. 5 (2012): 727–34. http://dx.doi.org/10.2298/hemind111209018p.

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The purpose of this work is to study the effect of grape pomace enrichment in solid phase (stems and seeds) on phenolic compounds and colour stability of obtained red wines, before and after use of different fining agents. Results have shown increase in total phenols and flavan-3-ols content after grape solid phase addition. On the other hand, decrease in anthocyanins content has generally been recorded in all wine samples except in wines obtained with addition of 40 g/l of seeds during maceration. Stems addition caused decrease in colour intensity while addition of seeds has increased this co

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Vuković, Miodrag, Željko V. Despotović, and Bojan Simonović. "Iskustva u izvođenju i eksploataciji fotonaponske elektrane instalisane snage 500 kW u fabrici „Gruner“ d.o.o-Vlasotince." Energija, ekonomija, ekologija XXIV, no. 4 (2022): 57–67. http://dx.doi.org/10.46793/eee22-4.57v.

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The main purpose of the solar photovoltaic power plant (SPVPP), with installed power of 500 kW on the roof of the factory GRUNER Serbian Ltd in Vlasotince, is to electrical supply of consumers in the factory. Considering the geometric dimensions of the roof and the daily and monthly profiles of electricity consumption in the factory, at the beginning of 2021, SPVPP was designed. In this way It is achieves parallel operation with the electricity distribution network, with the possibility of delivering surplus electrical energy. SPVPP was performed by the company CONSEKO Ltd., Belgrade in the pe

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Li, Min Jie, Ya Xiong, Yun An, and Bang Tao Zhou. "The Study on the Fermentation of Phyllanthus emblica L. Juice." Advanced Materials Research 183-185 (January 2011): 282–86. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.282.

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This article studied the problems of the low juice yield during the process of fermentation and the problems of sedimentation and brown during the period of storage, got the optimum technological conditions of fermentation: the amount of pectase is 0.25%, the amount of cellulose is 0.25%, the time and the temperature of zymohydrolysis are four hours and 40°C respectively. Adding 6% of diatomite and 0.1% of PVPP sorbents after zymohydrolysis, then filtering and clarifying after 2h’s static placing.

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Dèdéhou, Vidjinnangni Fifamè Grâce Nadège, Sévérin Babatoundé, and Mahulé Sylvie Hounzangbé-Adoté. "In Vitro Effect of Degradation in Sacco in the Rumen on the Anthelmintic Properties of Parkia Biglobosa and Pterocarpus Erinaceus on Haemonchus Contortus." European Scientific Journal, ESJ 14, no. 21 (2018): 87. http://dx.doi.org/10.19044/esj.2018.v14n21p87.

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Parkia biglobosa and Pterocarpus erinaceus are traditionally used to treat various ailments including helminth infections. This study was undertaken to evaluate the effect of the rumen degradability on anthelmintic properties of the two plants and to examine the possible role of tannins and/or polyphenols on these properties. Hydro-acetone extracts of in sacco degradability residues of P. biglobosa pods and P. erinaceus leaves were screened in vitro to determine the possible anti-parasitic effects against eggs and infective larvae of Haemonchus contortus. In addition, the possible involvement

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Méndez-Álvarez, Dawa, and Ana Abdelnour-Esquivel. "Establecimiento in vitro de Terminalia amazonia (Gmel.) Excell." Revista Forestal Mesoamericana Kurú 11, no. 27 (2014): 7. http://dx.doi.org/10.18845/rfmk.v11i27.1774.

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<em>Terminalia amazonia </em>es una especie nativa utilizada para la reforestación por sus características de rápido crecimiento y madera de buena calidad. El objetivo principal de este trabajo fue determinar la condiciones necesarias para el establecimiento in vitro de dicha especie, por lo cual se trabajó con plantas provenientes de campo y de invernadero, a estas últimas se les establecieron condiciones sanitarias, posteriormente se evaluó el efecto de dos agentes desinfectantes, hipocloritode sodio (NaClO) y cloruro de mercurio, en diferentes concentraciones y tiempos de exposi

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Khandakar, Jebunnahar, Md Abdul Muktadir, Md Shafiqul Islam, Kenichi Yamaguchi, Tatsuya Oda, and Yoshie Kitamura. "Extraction and fractionation of subproteome from root tips of Hyoscyamus albus." Journal of the Bangladesh Agricultural University 17, no. 4 (2019): 430–36. http://dx.doi.org/10.3329/jbau.v17i4.44602.

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Identification and quantification of different metabolites under stress, especially protein, is a vital way to understand plant adaptation mechanism. We established an efficient protein extraction method from the tiny amount (100 mg) of root tips of non-model medicinal plant Hyoscyamus albus, using bead-beating cell disruption, TRIzol extraction, and sequential chemical protein solubilization. H. albus is very well known for biosynthesized of different secondary metabolites like hyoscyamine, tropane alkaloids and scopolamine. Our method is rational for sample preparation even in small-scale pr

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Cong, Le Viet. "STUDY ON SOLUTIONS FOR STABILIZING FRUITY FLAVOUR MIXED BEER DURING FILTRATION AND PACKAGING." Vietnam Journal of Science and Technology 55, no. 5A (2018): 234. http://dx.doi.org/10.15625/2525-2518/55/5a/12200.

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Nowadays, fruity flavours mixed beers are very popular and widely accepted in the world. However, there aren’t brewers producing this brand of beer in Vietnam; hence it is mostly imported products. New beer types can be produced based on lager beer, then mixed with natural flavours, sugar and citric acid. Mixed beer have low alcohol content ranged from 2.5 to 3.0 % v/v. Due to the blending process of lager beer with other ingredients mixed beer may have different stability from the base lager beer. The aim of this study is to improve beer stability up to six months shelf-life. Experiments were

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