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Journal articles on the topic '25 hydroxyl'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Chandrakar, Ankur Kumar, Arun Alexander, Medha R., Kalaiselvi Rajendiran, and Karthikeyan Ramasamy. "25-Hydroxyl Vitamin D Deficiency in Nasal Polyposis." International Archives of Otorhinolaryngology 24, no. 03 (2019): e308-e312. http://dx.doi.org/10.1055/s-0039-3399541.

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Abstract Introduction Vitamin D is known to have immunomodulatory functions and has action on chronic inflammatory processes, such as nasal polyposis. Objective The present study assessed the levels of 25-hydroxy vitamin D and high-sensitivity C-reactive protein (hs-CRP) in patients with nasal polyposis, as compared with healthy control subjects, and identified their association with disease severity in nasal polyposis. It further assessed the levels of 25-hydroxyl vitamin D and hs-CRP in patients with nasal polyposis and atopy and compared it with patients with nasal polyposis without atopy.

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2

Hu, T. Q., G. Leary та D. Wong. "A New Approach Towards the Yellowing Inhibition of Mechanical Pulps. Part I: Selective Removal of α-Hydroxyl and α-Carbonyl Groups in Lignin Model Compounds". Holzforschung 53, № 1 (1999): 43–48. http://dx.doi.org/10.1515/hf.1999.008.

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Summary The α-hydroxyl group in lignin model compounds 1-(3,4-dimethoxyphenyl)-2-(2-methoxyphenoxy)-1,3-propanediol (1) and 1-(4-hydroxy-3-methoxyphenyl)ethanol (3), and the α-carbonyl group in 1-(3,4-dimethoxyphenyl)-2-(2-methoxyphenoxy)ethan-1-one (5) are removed by treatment of the model compounds with trifluoroacetic acid (CF3CO OH) and triethylsilane (Et3sih) in methylene chloride. The reaction is highly chemoselective and it tolerates the lignin γ-hydroxyl group, phenol and β-O-4-aryl ether linkage. The α-hydroxyl group in 1 has also been removed with triethylsilane in aqueous trifluoroa

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Mukherjee, Tulika, Tapas Sarkar, Piyali Paul, Ajit K. Chakraborty, Parasuraman Jaisankar та Siba Brata Mukhopadhyay. "Putralone, a Novel 10α-Hydroxy-25-nor D:A Friedo-Oleanane Triterpenoid from Putranjiva Roxburghii". Natural Product Communications 7, № 4 (2012): 1934578X1200700. http://dx.doi.org/10.1177/1934578x1200700424.

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Chemical investigation of the leaves of Putranjiva roxburghii has resulted in the isolation of two new triterpenoids, putralone, a novel 10α-hydroxy-25-nor D:A friedo-olean-9(11)-en-3 one and 3β-acetoxy-cycloart-24-en-23-one, along with a rare hopanoid, adian-5-en-3β,29-diol. Other known triterpenoids isolated from this plant are 3β-acetoxy-adian-5-ene, putrol, putrone, putranjivadione, roxburghonic acid, friedelin, friedlan-3α-ol, oleanolic acid and erythrodiol. Interestingly, putralone is the first example of a naturally occurring nor friedo-oleanane triterpenoid having a hydroxyl functional

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4

Shirato, Midori, Hiroyo Ikai, Keisuke Nakamura, et al. "Synergistic Effect of Thermal Energy on Bactericidal Action of Photolysis of H2O2in Relation to Acceleration of Hydroxyl Radical Generation." Antimicrobial Agents and Chemotherapy 56, no. 1 (2011): 295–301. http://dx.doi.org/10.1128/aac.05158-11.

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ABSTRACTThe purpose of the present study is to evaluate the effect of thermal energy on the yield of and the bactericidal action of hydroxyl radical generated by photolysis of H2O2. Different concentrations of H2O2(250, 500, 750, and 1,000 mM) were irradiated with light-emitting diodes (LEDs) at a wavelength of 400 ± 20 nm at 25°C to generate hydroxyl radical. The 500 mM H2O2was irradiated with the LEDs at different temperatures (25, 35, 45, and 55°C). Electron spin resonance spin trapping analysis showed that the yield of hydroxyl radicals increased with the temperature, as well as the concen

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5

Cui, Xiangyu, Penghui Li, Baohua Hu, et al. "Simulation Study for the Adsorption of Carbon Disulfide on Hydroxyl Modified Activated Carbon." Molecules 28, no. 12 (2023): 4627. http://dx.doi.org/10.3390/molecules28124627.

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In this study, grand canonical Monte Carlo simulations (GCMC) and molecular dynamics simulations (MD) were used to construct models of activated carbon with hydroxyl-modified hexachlorobenzene basic unit contents of 0%, 12.5%, 25%, 35% and 50%. The mechanism of adsorption of carbon disulfide (CS2) by hydroxyl-modified activated carbon was then studied. It is found that the introduction of hydroxyl functional groups will improve the adsorption capacity of activated carbon for carbon disulfide. As far as the simulation results are concerned, the activated carbon model containing 25% hydroxyl mod

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Aggarwal, Rachna, Anthony A. Birkbeck, Robin G. F. Giles, Ivan R. Green, Yolanta Gruchlik, and Francois J. Oosthuizen. "Regioselectivity in the Syntheses of Enantiopure 2-Benzopyrans through Intramolecular Cyclization of Tethered Lactaldehydes. Conformations of the Products." Australian Journal of Chemistry 56, no. 5 (2003): 489. http://dx.doi.org/10.1071/ch03027.

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Using titanium tetraisopropoxide, the enantiopure tethered lactaldehyde (α′ S,2S)-2-(3′-hydroxy-α′-methyl-benzyloxy)propanal (6) is cyclized with complete regio- and diastereoselectivity ortho to the phenolic hydroxyl group to give (1S,3S,4R)-3,4-dihydro-1,3-dimethyl-2-benzopyran-4,5-diol (7). Similar cyclization of the epimeric (α′ R,2S)-lactaldehyde (25) yields solely the corresponding (1R,3S,4R)-4,5-diol (34). The 4,5-diacetate (26), but not (35), undergoes conformational inversion of the heterocyclic ring through significant 4,5-peri interactions between the adjacent acetoxy substituents.

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7

A, Gupta, and Verma AK. "Association of Serum 25-Hydroxyl Vitamin D Deficiency and Idiopathic Presenile Cataract -A Hospital Based Study." Open Access Journal of Ophthalmology 10, no. 2 (2025): 1–5. https://doi.org/10.23880/oajo-16000340.

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Background: Cataract is the leading cause of blindness in India mainly due to age related changes in the lens. Early onset cataract can be visually debilitating having high societal burden requiring early surgical intervention. Identifying modifiablerisk factors can delay or prevent early onset cataractous changes.Aim of the study: The aim of this study was to determine any association between Serum 25-Hydroxyl (25-OH ) Vitamin D Deficiency and Idiopathic Presenile CataractMaterials and Methods: The study was undertaken at Tertiary care hospital in hilly state of India. A detailed medical hist

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8

Albahlol, Ibrahim A., Abdulrahman H. Almaeen, Abdulrahman A. Alduraywish, Umar F. Dar, and Tarek H. El-Metwally. "Vitamin D Status and Pregnancy Complications: Serum 1,25-di-hydroxyl-Vitamin D and its Ratio to 25-hydroxy-Vitamin D are Superior Biomarkers than 25-hydroxy-Vitamin D." International Journal of Medical Sciences 17, no. 18 (2020): 3039–48. http://dx.doi.org/10.7150/ijms.47807.

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9

Psaltou, Savvina, Efthimia Kaprara, Kyriaki Kalaitzidou, Manassis Mitrakas, and Anastasios Zouboulis. "The Effect of Thermal Treatment on the Physicochemical Properties of Minerals Applied to Heterogeneous Catalytic Ozonation." Sustainability 12, no. 24 (2020): 10503. http://dx.doi.org/10.3390/su122410503.

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In order to enhance the efficiency of heterogeneous catalytic ozonation, the effect of thermal treatment on three commonly used and inexpensive minerals, i.e., zeolite, talc and kaolin (clay), which present different physicochemical properties as potential catalysts, has been examined for the removal of para-chlorobenzoic acid (p-CBA). p-CBA is considered a typical micro-pollutant, usually serving as an indicator (model compound) to evaluate the production of hydroxyl radicals in ozonation systems. The catalytic activity of selected solid catalysts was studied for different pH values (6, 7 and

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10

Sihombing, Y. A., D. Edikresnha, I. Anshori, D. A. Hapidin, and K. Khairurrijal. "Electrical Resistivities of PVA/Activated Carbon-Based Hydrogels." Journal of Physics: Conference Series 2734, no. 1 (2024): 012037. http://dx.doi.org/10.1088/1742-6596/2734/1/012037.

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Abstract This study investigates the physical and electrical properties of the polyvinyl alcohol (PVA) hydrogel incorporated with edible Activated Carbon (AC). Three samples, namely PVA, PVA/AC 0.5, and PVA/AC 1.0 were prepared using the freeze-thaw method. The samples underwent six freeze-thaw cycles, each consisting of freezing at –25°C for 20 hours and subsequent exposure to room temperature for 4 hours. The porous network of hydrogel is attributed to the hydroxyl groups of PVA, resulting from the intermolecular cross-linking of PVA chains. The edible AC was uniformly dispersed within the h

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11

Jian, Xi-Xian, Pei Tang, Xiu-Xiu Liu, et al. "Structure-Cardiac Activity Relationship of C19-Diterpenoid Alkaloids." Natural Product Communications 7, no. 6 (2012): 1934578X1200700. http://dx.doi.org/10.1177/1934578x1200700606.

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Thirty three C19-diterpenoid alkaloids, twenty-two prepared from known C19-diterpenoid alkaloids and eleven isolated from Aconitum and Delphinium spp. were evaluated for their cardiac activity in the isolated bullfrog heart assay. Among them, eleven compounds exhibited cardiac activity, with average rate of amplitude increase in the range of 16-118%. Compound 7, mesaconine (17), hypaconine (25), and beiwutinine (26) exhibited strong cardiac activities relative to the reference drug. The structure-activity relationship data acquired indicated that an α-hydroxyl group at C-15, a hydroxyl group a

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12

Oluwadare, Benjamin Segun, Samson Adedayo Adeleye, and Taiwo Oluwasesan Oni. "Performance Analysis of Hydroxyl (HHO) Gas Addition on a Gasoline Generator." European Journal of Applied Science, Engineering and Technology 2, no. 2 (2024): 334–54. https://doi.org/10.59324/ejaset.2024.2(2).25.

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The research explores the use of hydroxyl (HHO) gas as a renewable energy source due to the over-reliance on fossil fuels in conventional engines. An HHO cell is designed to produce hydrogen gas used in conventional generators. The cell uses electrolysis of water and potassium hydroxide as a catalyst. The HHO gas is generated with ordinary water without any catalyst and the detailed results of the reaction and analysis are presented. The goal is to develop and test-run an electrolytic cell on a gasoline engine (spark ignition engine) and measure the variation of its parameters in comparison to

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13

Pato, Usman, Yusmarini, Emma Riftyan, et al. "Probiotic Properties of Lactobacillus fermentum InaCC B1295 Encapsulated by Cellulose Microfiber from Oil Palm Empty Fruit Bunches." Fermentation 8, no. 11 (2022): 602. http://dx.doi.org/10.3390/fermentation8110602.

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This study aims at an in vitro characterization of the acid and bile tolerance of Lactobacillus fermentum InaCC B1295 (LFB1295) encapsulated with hydrogel cellulose microfibers (CMF) from oil palm empty fruit bunches (OPEFBs). The viability at different storage temperatures was assessed. The experimental design used in this research was an in vitro trial. The microencapsulated probiotic was stored at 25 °C and 4 °C for 28 days. LFB1295 encapsulated with cellulose microfiber hydrogel from OPEFB showed a stable viability of probiotic bacteria at pH 2 and 0.5% (m/v) oxgall. In addition, the micro

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14

Collins, Elaine D., June E. Bishop, Craig M. Bula, Alejandra Acevedo, William H. Okamura та Anthony W. Norman. "Effect of 25-hydroxyl group orientation on biological activity and binding to the 1α,25-dihydroxy vitamin D3 receptor". Journal of Steroid Biochemistry and Molecular Biology 94, № 4 (2005): 279–88. http://dx.doi.org/10.1016/j.jsbmb.2004.11.013.

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15

Purwanto, Edy, Lieke Riadi, Nathania Tamara I., and Mellisha Ika K. "The Optimization of Ozonolysis Reaction For Synthesis of Biopolyol From Used Palm Cooking Oil." ASEAN Journal of Chemical Engineering 14, no. 1 (2014): 1. http://dx.doi.org/10.22146/ajche.49711.

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Biopolyol is a raw material for synthesis of polyurethanes which is used as thermoset and thermoplastic materials, adhesives, rigid or non-rigid foams and also for coating. The utilization of waste edible oil as feedstock for synthesis of biopolyol has attracted some researchers. However, there is little attention focused on the application of ozone technology for synthesis of biopolyol from used cooking oil through ozonolysis reaction. Response surface methodology was performed to determine the optimal operating condition in the synthesis of biopolyol using ozone and sorbitol as a hydroxyl gr

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16

Morozov, I. A. "Dose-dependent effect of cadaverine on hydroxyl radicals’ production by human peripheral blood leukocytes." Perm Medical Journal 41, no. 4 (2024): 168–74. http://dx.doi.org/10.17816/pmj414168-174.

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Objective. To assess changes in the generation of hydroxyl radicals by leukocytes under the influence of cadaverine at concentrations of 1, 5 and 25 mmol/L. Materials and methods. Peripheral venous blood samples were obtained from 40 apparently healthy donors. To assess the production of hydroxyl radicals, a luminol-dependent chemiluminescence reaction with blood leukocytes, which were pre-incubated with cadaverine at concentrations of 1, 5 and 25 mmol/L was carried out. The study was conducted on a Luminoskan Ascent® Thermo Labsystems (USA) luminometer for 180 minutes. For statistical analysi

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17

Butt, Mehwish Arif, Asma Arman, and Tahir Ansari. "FREQUENCY OF 25-HYDROXY VITAMIN D DEFICIENCY IN PATIENTS WITH MULTIPLE SCLEROSIS." KHYBER MEDICAL UNIVERSITY JOURNAL 14, no. 1 (2022): 42–6. http://dx.doi.org/10.35845/kmuj.2022.22039.

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OBJECTIVE: To determine the frequency of 25-hydroxy vitamin-D deficiency in Patients with multiple sclerosis (MS). METHODS: This cross-sectional study was conducted at Civil Hospital Karachi, Pakistan from January to December 2019. One hundred and sixty five diagnosed cases of MS of either gender, aging 20-55 years, not taking vitamin-D supplements, steroids and could go outside in the sun were selected through non-probability consecutive sampling technique. Patients having history of rickets, parathyroid disease, chronic liver or renal diseases were excluded. Blood sample was taken to m

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18

Connors, S., and M. Vore. "Coregulation of C3-hydroxyl versus C17-hydroxyl glucuronidation of beta-estradiol in pregnancy and after treatment with phenobarbital or ethinyl-estradiol." Journal of Pharmacology and Experimental Therapeutics 246, no. 1 (1988): 54–59. https://doi.org/10.1016/s0022-3565(25)21038-2.

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19

Bhixavatimath, Prabhulingayya, Akram Naikawadi, Yasmeen Maniyar, Gurudatta Moharir, and Vijayakumar Daroj. "Synthesis and characterization of 2-thiophen flavonoid analogue for free radical scavenging antioxidant analysis." Biomedicine 42, no. 3 (2022): 543–49. http://dx.doi.org/10.51248/.v42i3.1485.

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Introduction and Aim: Currently research is focussed on the use of antioxidants in preventing oxidative stress induced diseases. Flavonoids present in plant sources gaining more therapeutic importance due to their antioxidant property, but their solubility and some pharmacokinetic concern, diverted the current research study towards the synthesis of these flavonoids for their therapeutic potential. The study was aimed to synthesize and characterize the 2-thiophen flavonoid analogue for free radical scavenging antioxidant activity. Materials and Methods: The test synthetic compound PNF(3-hydrox

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20

Kawana, Momoko, Masatoshi Miyamoto, Yusuke Ohno, and Akio Kihara. "Comparative profiling and comprehensive quantification of stratum corneum ceramides in humans and mice by LC/MS/MS." Journal of Lipid Research 61, no. 6 (2020): 884–95. http://dx.doi.org/10.1194/jlr.ra120000671.

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Ceramides are the predominant lipids in the stratum corneum (SC) and are crucial components for normal skin barrier function. Although the composition of various ceramide classes in the human SC has been reported, that in mice is still unknown, despite mice being widely used as animal models of skin barrier function. Here, we performed LC/MS/MS analyses using recently available ceramide class standards to measure 25 classes of free ceramides and 5 classes of protein-bound ceramides from human and mouse SC. Phytosphingosine- and 6-hydroxy sphingosine-type ceramides, which both contain an additi

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21

Ben, Haoxi, Fengze Wu, Zhihong Wu, Guangting Han, Wei Jiang, and Arthur J. Ragauskas. "A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks." Polymers 11, no. 9 (2019): 1387. http://dx.doi.org/10.3390/polym11091387.

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Pyrolysis of raw pine bark, pine, and Douglas-Fir bark was examined. The pyrolysis oil yields of raw pine bark, pine, and Douglas-Fir bark at 500 °C were 29.18%, 26.67%, and 26.65%, respectively. Both energy densification ratios (1.32–1.56) and energy yields (48.40–54.31%) of char are higher than pyrolysis oils (energy densification ratios: 1.13–1.19, energy yields: 30.16–34.42%). The pyrolysis oils have higher heating values (~25 MJ/kg) than bio-oils (~20 MJ/kg) from wood and agricultural residues, and the higher heating values of char (~31 MJ/kg) are comparable to that of many commercial coa

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Bandala, Erick R., and Oscar M. Rodriguez-Narvaez. "On the Nature of Hydrodynamic Cavitation Process and Its Application for the Removal of Water Pollutants." Air, Soil and Water Research 12 (January 2019): 117862211988048. http://dx.doi.org/10.1177/1178622119880488.

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Cavitation is considered a high energy demanding process for water treatment. For this study, we used a simple experimental setup to generate cavitation at a low pressure (low energy) and test it for hydroxyl radical production using a well-known chemical probe as a hydroxyl radical scavenger. The conditions for generating the cavitation process (eg, pressure, flow velocity, temperature, and other significant variables) were used to degrade model contaminants, an azo dye and an antibiotic. The amount of hydroxyl radicals generated by the system was estimated using N,N-dimethyl-p-nitrosoaniline

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23

Jorge Pinto, André, Nuria Sánchez-Pastor, and Angeles Fernández-González. "The Controlling Effect of CaCO3 Supersaturation over Zn Carbonate Assemblages: Co-Crystallization in Silica Hydrogel." Minerals 14, no. 12 (2024): 1274. https://doi.org/10.3390/min14121274.

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Weathering products of sphalerite-bearing ores play an important role in controlling the fate of Zn in the environment. In this framework, the relative stability of Zn carbonates is of special relevance for the common case of ore weathering by carbonated groundwater in the presence of calcium carbonates. We investigated the experimental (co)nucleation and growth of Zn and Ca carbonates at 25 °C in finite double diffusion silica hydrogel media with the purpose of deciphering the system’s reactive pathway and unraveling the major governing factors behind the obtained mineral assemblages. The cry

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24

Faisal, Ramzan, and Abu Bakar Ali Saad. "Association of Vitamin D with Cardiovascular Disease." Journal of Contemporary Insights in Health Sciences 1, no. 1 (2023): 1–8. http://dx.doi.org/10.69591/jcihs.v1i1.2.

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Objective: To investigate the relationship between vitamin D level in serum and cardiovascular diseases. Study Design: Prospective study. Place and duration: Study was conducted in Choudhary Parvez Ellahi institute of cardiology in one year duration from 1st February 2020 to 1st February 2021. Methodology: One hundred and fifty patients presented with cardiac illness at emergency department were enrolled in study. Serum vitamin D hydroxyl level was divided into three categories deficiency, insufficiency and deficiency. SPSS version 23 was used for fata analysis. P value ≤0.5 was taken as signi

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25

Oluwadare, Benjamin Segun, Samson Adedayo Adeleye, and Taiwo Oluwasesan Oni. "Performance Analysis of Hydroxyl (HHO) Gas Addition on a Gasoline Generator." European Journal of Applied Science, Engineering and Technology 2, no. 2 (2024): 334–54. http://dx.doi.org/10.59324/ejaset.2024.2(2).25.

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The research explores the use of hydroxyl (HHO) gas as a renewable energy source due to the over-reliance on fossil fuels in conventional engines. An HHO cell is designed to produce hydrogen gas used in conventional generators. The cell uses electrolysis of water and potassium hydroxide as a catalyst. The HHO gas is generated with ordinary water without any catalyst and the detailed results of the reaction and analysis are presented. The goal is to develop and test-run an electrolytic cell on a gasoline engine (spark ignition engine) and measure the variation of its parameters in comparison to

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26

Logani, Mahendra K., and Marvin C. Ziskin. "Millimeter Waves at 25 mw/cm2have No Effect on Hydroxyl Radical-Dependent Lipid Peroxidation." Electro- and Magnetobiology 17, no. 1 (1998): 67–73. http://dx.doi.org/10.3109/15368379809012888.

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Abdellah, Marwa Mahmoud, Engy Mohamed Mostafa, Eman Hassan Salama, and Eman Roshdy Mohamed. "Association of Serum 25-Hydroxyl Vitamin D Deficiency and Age-Related Cataract: A Case-Control Study." Journal of Ophthalmology 2019 (April 15, 2019): 1–5. http://dx.doi.org/10.1155/2019/9312929.

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Purpose. To study the relation between the serum 25-hydroxyl vitamin D (OH D) level and the occurrence of age-related cataract in a case-control study. Patients and Methods. 325 cataract patients and 385 control individuals of both sexes were examined for the 25-OH D level using the chemiluminescent microparticle immunoassay (CMIA) technology. Results. Mean 25-OH D level in cataract patients was 7.6 ± 5.5 ± 11.2 ng/mL and median was 5.6 (2.6–31.9), while in the control group, mean 25-OH D level was 18.5 ± 9.6 ng/mL and median was 17.8 (3.4–37.8) (p value < 0.001). There was a statistically

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Chen, Ruei-Ching, and Chung-Yu Lan. "Human Antimicrobial Peptide Hepcidin 25-Induced Apoptosis in Candida albicans." Microorganisms 8, no. 4 (2020): 585. http://dx.doi.org/10.3390/microorganisms8040585.

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Hepcidin 25 (hep 25) is a cysteine-rich 25-amino acid antimicrobial peptide containing the amino-terminal Cu(II)/Ni(II)-binding (ATCUN) motif. Upon metal binding, the ATCUN motif is known to be involved in the generation of reactive oxygen species (ROS), especially hydrogen peroxide and hydroxyl radicals, which act against different bacterial species. However, the antifungal activity and its correlation to the Cu(II)-ATCUN complex of Hep 25 are still poorly understood. Here, we found that ROS accumulation plays an important role in the fungicidal activity of hep 25 against Candida albicans. In

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Kim, P. M., and P. G. Wells. "Phenytoin-initiated hydroxyl radical formation: characterization by enhanced salicylate hydroxylation." Molecular Pharmacology 49, no. 1 (1996): 172–81. https://doi.org/10.1016/s0026-895x(25)08685-7.

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Tella, M., and G. S. Pokrovski. "Antimony(V) complexing with O-bearing organic ligands in aqueous solution: an X-ray absorption fine structure spectroscopy and potentiometric study." Mineralogical Magazine 72, no. 1 (2008): 205–9. http://dx.doi.org/10.1180/minmag.2008.072.1.205.

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AbstractThe stabilityand structure of aqueous complexes formed by pentavalent antimony (SbV) with simple organic ligands (acetic, adipic, oxalic, citric acids, catechol and xylitol) having O-functional groups (carboxyl, alcoholic hydroxyl, aliphatic and aromatic hydroxyl) typical of natural organic matter (NOM), were determined at 25°C from potentiometric and X-ray absorption fine structure spectroscopy (XAFS) measurements. In organic-free aqueous solutions, spectroscopic data are consistent with the dominant formation of SbV hydroxide species, Sb(OH)5 and Sb(OH)6-, at acid and near-neutral to

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Bajaj, Prachi, Shivlingrao Mamle Desai, Pearl Dighe, Soniya Naik, and Bheemanagouda Biradar. "SYNTHESIS OF 4-HYDROXY-3-(1-HYDROXY-2-(SUBSTITUTEDAMINO)ETHYL)-1-PHENYL/ METHYL QUINOLIN-2(1H)-ONE AS ANTICANCER AGENTS." Asian Journal of Pharmaceutical and Clinical Research 10, no. 8 (2017): 225. http://dx.doi.org/10.22159/ajpcr.2017.v10i8.18836.

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Objective: The current work is concerned with the synthesis of a series of 4-hydroxy-3-(1-hydroxy-2-(substituted amino)ethyl)-1-phenyl/ methylquinolin-2(1H)-one[III-a(1-5)/III-b(1-5)] and evaluation of its in vitro anticancer activity.Methods: The starting material for linomide analogs was synthesized by following literature procedures. The carbonyl group was reduced to hydroxyl group using sodium borohydride, and the methyl group was brominated using bromine in acetic acid. Further bromine was nucleophilically substituted by primary amines. All the synthesized compounds were satisfactorily ch

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Cáceres-Alonso, Mercedes, Miguel Costas, Lina Andreoli-Ball, and Donald Patterson. "Steric effects on the self-association of branched and cyclic alcohols in inert solvents. Apparent heat capacities of secondary and tertiary alcohols in hydrocarbons." Canadian Journal of Chemistry 66, no. 4 (1988): 989–98. http://dx.doi.org/10.1139/v88-165.

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Apparent heat capacities have been measured for fifteen branched and cyclic alcohols in dilute n-decane solution at 25 °C. The alcohols were 2-methyl-2-propanol, cyclohexanol, 3-methyl-3-pentanol, trans-, cis-, and mixed isomer 2-methylcyclohexanol, 1-methylcyclohexanol, 3-ethyl-3-pentanol, cyclooctanol, 3,7-dimethyl-1-octanol, 5-decanol, 4-propyl-4-heptanol, cyclododecanol, 5-butyl-5-nonanol, and 8-hexadecanol (in n-hexane). Excess heat capacities CpE throughout the concentration range were measured at 25 °C for: 1-hexanol + n-hexadecane (n-C16) and + 2,2,4,4,6,8,8-heptamethylnonane (br-C16),

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Nguyen, Vu Viet Linh, Gia Quynh Nhu Pham, Thi Hong Anh Nguyen, and Van Cuong Nguyen. "Fabrication and Characterization of Alginate Hydrogels for Control Release System of Catechin-Derived Tea Leave Extract." Journal of Biomimetics, Biomaterials and Biomedical Engineering 58 (August 19, 2022): 97–107. http://dx.doi.org/10.4028/p-63176q.

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Polyphenolic chemicals found in tea leaves are frequently used in pharmaceutics and the food industry. Catechin is a polyphenol that has antimicrobial, antioxidant, and antibacterial effects, as well as other health advantages. The goal of this study was to create a catechin-encapsulated alginate hydrogel (Cate-ALG) that would protect catechin from degradation and bioactivity loss in stressful environments while also delivering catechin. The antioxidant ability of catechin was found to be greater than that of vitamin C using the 2,2-diphenyl-1-pierylhyrazyl assay. The FT-IR spectra revealed th

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Mujahidin, Didin, Wiwin Mujiati, and Anita Alni. "An Approach in Synthesis of 1-Morpholino-2-phenylethane-1,2-dione Catalyzed by Copper (II) Bromide." Journal of the Indonesian Chemical Society 3, no. 3 (2020): 145. http://dx.doi.org/10.34311/jics.2020.03.3.145.

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A novel approach towards synthesis of α-Ketoamides was serendipitously found in acetophenone's reaction with a secondary amine catalyzed by copper (II) bromide. This methodology is a promising simple alternative to access biologically active compounds containing α-Ketoamides. Reactions were carried out at room temperature using dimethyl sulfoxide (DMSO) as solvent and catalyst loading at 10 mol %. The products were purified using a chromatographic method and analyzed extensively by spectroscopic methods, namely 1D (1H and 13C) and 2D NMR (HMBC and HSQC). The reaction of acetophenone and morpho

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J., Prema Kumari, Allen Gnana Raj G. та Rajendiran N. "Study on the spectral characteristics of 4-hydroxy-3-methoxy benzoic acid in different pH and α-cyclodextrin". Journal of Indian Chemical Society Vol. 86, Jan 2009 (2009): 53–57. https://doi.org/10.5281/zenodo.5807082.

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Department of Chemistry, Scott Christian College (Autonomous), Nagercoil-629 003, Tamilnadu, lndia <em>E-mail </em>: premarussel@rediffmail.com CAS in Marine Biology, Perangipettai, Annamalai University, Chennai, India <em>Manuscript received 25 January 2008, revised 17 June 2008, accepted 16 September 2008</em> Effect of buffer solutions of different pH and α-cyclodextrin (α-CD) on the absorption and fluorescence spectra of 4-hydroxy-3-methoxy benzoic acid (vanillic acid HMB) have been investigated. The inclusion complex of α-CD with HMB is investigated by UV-Visible and flu

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36

Ekanayake, P., Y. D. Lee, and J. Lee. "Antioxidant Activity of Flesh and Skin of Eptatretus Burgeri (Hag Fish) and Enedrias Nebulosus (White Spotted Eel)." Food Science and Technology International 10, no. 3 (2004): 171–77. http://dx.doi.org/10.1177/1082013204044822.

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Ethyl acetate and diethyl ether extracts, previously extracted with methanol, were obtained from flesh and skin of Eptatretus burgeri (hag fish) and Enedrias nebulosus (white spotted eel). Eight different extracts (4 mg/mL) were tested for DPPH free radical scavenging activity and the values were compared with commercial antioxidants (α-tocopherol and BHT). All extracts of E. burgeri exhibited significantly positive results (> 65%) in scavenging DPPH radicals compared to E. nebulosus. Thus, only E. burgeri extracts were tested for dose effect, hydrogen peroxide, hydroxyl radical, superoxide

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37

Parigger, C. G., and C. M. Helstern. "Hydroxyl Molecular Line Shapes in Laser-Ignition of Air." Journal of Physics: Conference Series 2439, no. 1 (2023): 012004. http://dx.doi.org/10.1088/1742-6596/2439/1/012004.

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Abstract This work communicates measurement and analysis of diatomic molecular hydroxyl (OH) spectra after generation of laser-induced plasma. A relative laboratory-air humidity of the order of 25% causes the occurrence of OH recombination radiation that is recorded with optical emission spectroscopy. A Q-switched, 150 mJ, 6 ns pulsed Nd:YAG laser beam at the fundamental wavelength of 1064 nm is focused in air with f/5 optics. Formation of OH is clearly discernible at time delays of several dozen microseconds after plasma initiation. Optical emissions are dispersed by a 0.64-m Czerny-Turner sp

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Frost, Ray L., Janos Kristof, Eva Mako, and J. Theo Kloprogge. "Modification of the Hydroxyl Surface in Potassium-Acetate-Intercalated Kaolinite between 25 and 300 °C." Langmuir 16, no. 19 (2000): 7421–28. http://dx.doi.org/10.1021/la9915318.

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Frost, Ray L., Janos Kristof, Eva Mako, and J. Theo Kloprogge. "Modification of the hydroxyl surface of potassium acetate intercalated halloysite between 25 and 300 °C." American Mineralogist 85, no. 11-12 (2000): 1735–43. http://dx.doi.org/10.2138/am-2000-11-1217.

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Reggio, P. H., H. H. Seltzman, D. R. Compton, W. R. Prescott, and B. R. Martin. "Investigation of the role of the phenolic hydroxyl in cannabinoid activity." Molecular Pharmacology 38, no. 6 (1990): 854–62. https://doi.org/10.1016/s0026-895x(25)09587-2.

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41

Litosov, H. E., I. M. Dvorko, N. A. Lavrov, N. A. Chistyakov, and A. A. Murawski. "Modification of polyacrylamide with hydroxyl- and carboxyl-containing compounds." Plasticheskie massy, no. 5-6 (July 11, 2020): 25–28. http://dx.doi.org/10.35164/0554-2901-2020-5-6-25-28.

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42

Verronen, P. T., C. J. Rodger, M. A. Clilverd, H. M. Pickett, and E. Turunen. "Latitudinal extent of the January 2005 solar proton event in the Northern Hemisphere from satellite observations of hydroxyl." Annales Geophysicae 25, no. 10 (2007): 2203–15. http://dx.doi.org/10.5194/angeo-25-2203-2007.

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Abstract. We utilise hydroxyl observations from the MLS/Aura satellite instrument to study the latitudinal extent of particle forcing in the northern polar region during the January 2005 solar proton event. MLS is the first satellite instrument to observe HOx changes during such an event. We also predict the hydroxyl changes with respect to the magnetic latitude by the Sodankylä Ion and Neutral Chemistry model, estimating the variable magnetic cutoff energies for protons using a parameterisation based on magnetosphere modelling and the planetary magnetic index Kp. In the middle and lower mesos

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Fu, Zhe, Linjie Zhang, Sijin Hang, et al. "Synthesis of Coumarin Derivatives: A New Class of Coumarin-Based G Protein-Coupled Receptor Activators and Inhibitors." Polymers 14, no. 10 (2022): 2021. http://dx.doi.org/10.3390/polym14102021.

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To expand the range of daphnetin-based inhibitors/activators used for targeting G protein-coupled receptors (GPCRs) in disease treatment, twenty-five coumarin derivatives 1–25, including 7,8-dihydroxycoumarin and 7-hydroxycoumarin derivatives with various substitution patterns/groups at C3-/4- positions, were synthesized via mild Pechmann condensation and hydroxyl modification. The structures were characterized by 1H NMR, 13C NMR and ESI-MS. Their inhibition or activation activities relative to GPCRs were evaluated by double-antibody sandwich ELISA (DAS–ELISA) in vitro. The results showed that

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Wang, Kun, Yuchao Tang, Xinyu Zhang, Xianhuai Huang, and Beiping Zhang. "Study of the Reaction Mechanism of the Excessive Adsorption of Mn2+ from Water by In Situ Synthesis of MnO2@SiO2 Colloid as an Adsorbent." International Journal of Molecular Sciences 26, no. 7 (2025): 2928. https://doi.org/10.3390/ijms26072928.

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An in situ-generated MnO2@SiO2 colloidal (ISMC) composite was used for the adsorption of Mn2+ ions in water. The adsorption capacity of ISMC at a concentration of 1 mg/L at 25 °C was as high as 3017.97 mg/g for the original concentration of 50 mg/L Mn2+ ions. Material characterization revealed that it is a porous sponge with a fibrous structure with a rough surface, many folds, and abundant pores, and these features provide many adsorption sites, which are conducive to the attachment of Mn2+ ions on its surface. ISMC has an isoelectric point of 3.5, indicating a negative surface charge that fa

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Abdel, Karim, M., A. Ateem Salwa, Faiza, and I. "Constituents and Antioxidant Activity of Raphanus sativus L. Grown in Turkey." Pharmaceutical and Chemical Journal 8, no. 1 (2021): 47–52. https://doi.org/10.5281/zenodo.13957734.

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The oil from <em>Raphanus sativus</em> L. seeds was characterized by GC-MS. A total of 25 components were identified and quantified. Major constituents are: 13-docosenoic acid, methyl ester, (Z)-(28.02%), cis-13-eicosenoic acid, methyl ester (15.35%), 9,12- octadecadienoic acid -(Z)-, methyl ester (12.75%) and hexadecanoic acid, methyl ester (8.63%). The antioxidant activity of<strong> </strong><em>Raphanus sativeus</em><strong> </strong>essential oil<strong> </strong>was conducted by different methods: metal chelating, free radical (DPPH<strong><sup>∙</sup></strong>) and superoxide anion scav

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Chen, Zeyu, and Wenbin Zhong. "Anti-Swelling Aramid-Nanofiber-Reinforced Zwitterionic Polymer Hydrogel for Strain Sensors." Materials 18, no. 8 (2025): 1800. https://doi.org/10.3390/ma18081800.

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Zwitterionic polymer hydrogels have great application prospects in wearable electronic devices due to their antifouling and excellent biocompatibility. However, its strong hydrophilicity often leads to easy swelling and poor mechanical properties. In this study, aramid nanofiber (ANF)-reinforced zwitterionic ion hydrogels were synthesized by the one-step free radical polymerization of N-acryloyl glycinamide (NAGA), N-[Tris (hydroxymethyl) methyl] acrylamide (THMA) and sulfobetaine methacrylate (SBMA) monomers in the presence of ANFs. A large number of hydrogen bonds were formed between the ami

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Hassan, Hammed. "Preparation of a set of selectively protected disaccharides for modular synthesis of heparan sulfate fragments: toward the synthesis of several O-sulfonated [β-D-GlcUA-(1→4)-β-D-GlcNAc]OPr types". Open Chemistry 3, № 4 (2005): 803–29. http://dx.doi.org/10.2478/bf02475206.

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AbstractA concise method for a stereocontrolled synthesis of a set of selectively protected disaccharides is reported. Coupling of the donor 11 onto acceptors 23 and 24, promoted by trimethylsilyl triflate-N-iodosuccinimide (TMSOTf-NIS), generated the disaccharides 25 and 26. Under typical conditions, condensation of the fully protected donor 12 onto acceptors 23 and 24 produced the disaccharides 27 and 28. The building blocks 25–28 were prepared in moderate yields having exclusive β-stereoselectivity. A unique pattern of protecting groups distinguished clearly between positions to be sulfated

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Kang, Tong Ho, Bin Na Hong, Su-Young Jung, et al. "Curculigo orchioides Protects Cisplatin-Induced Cell Damage." American Journal of Chinese Medicine 41, no. 02 (2013): 425–41. http://dx.doi.org/10.1142/s0192415x13500316.

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Cisplatin is commonly used as a chemotherapeutic agent against many human cancers. However, it generates reactive oxygen species (ROS) and has serious dose-limiting side effects, including ototoxicity. The roots of Curculigo orchioides (C. orchioides) have been used to treat auditory diseases such as tinnitus and hearing loss in Chinese traditional medicine. In the present study, we investigated the protective effects of an ethanol extract obtained from C. orchioides rhizome (COR) on cisplatin-induced cell damage in auditory cells (HEI-OC1). COR (2.5–25 μg/ml) inhibited cisplatin-induced HEI-O

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Li, Ying Chang, Xiao Zhang, and Jian Rong Li. "Extraction of Polyphenols from Porphyra and Scavenging Activity of Oxygen Free Radicals." Advanced Materials Research 864-867 (December 2013): 531–35. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.531.

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Polyphenols from Porphyra are important biological active substances. The effects of temperature, times, ethanol concentration and liquid to solid ratio were studied for the extraction yield of polyphenols from Porphyra through a single-factor exploration.Then, through an orthogonal experiment, it was investigated to get the best extraction conditions. The content of polyphenols was determined by Folin-Ciocalteu method. Scavenging ability to oxygen free radicals was also assessed. The results show that extraction temperature is 75°C, the extraction time is 2.5 h, ethanol concentration is 70% a

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Pereira, Douglas Cubas, Breno Pupin, and Kumiko Koibuchi Sakane. "Evaluation of hydrogel use in the development of Rapanea ferruginea with water restriction by vibrational Fourier Transform Infrared Spectroscopy (FTIR-UATR)." Ambiente e Agua - An Interdisciplinary Journal of Applied Science 16, no. 5 (2021): 1–16. http://dx.doi.org/10.4136/ambi-agua.2744.

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This study evaluated the use of hydrogel on the development of Rapanea ferruginea under water restriction through Vibrational Fourier Transform Infrared Spectroscopy (FTIR-UATR). Seedlings of approximately 30 cm height were transferred in pots with 3 L of soil. The group of seedlings was separated into 5 different triplicate treatments according to the amount of hydrogel, as follows: H1 (25%), H2 (20%), H3 (15%), H4 (10%) and S (control without hydrogel). The applied hydrogel was mixed homogeneously with the soil. All treatments were irrigated with 40 mL of water. FTIR spectra were obtained fr

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