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Journal articles on the topic 'Separative chemistry'

Author: Grafiati

Published: 1 February 2023

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1

Wong, Kar Chun, Pei Sean Goh, Ahmad Fauzi Ismail, Hooi Siang Kang, Qingjie Guo, Xiaoxia Jiang, and Jingjing Ma. "The State-of-the-Art Functionalized Nanomaterials for Carbon Dioxide Separation Membrane." Membranes 12, no. 2 (February 4, 2022): 186. http://dx.doi.org/10.3390/membranes12020186.

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Nanocomposite membrane (NCM) is deemed as a practical and green separation solution which has found application in various fields, due to its potential to delivery excellent separation performance economically. NCM is enabled by nanofiller, which comes in a wide range of geometries and chemical features. Despite numerous advantages offered by nanofiller incorporation, fabrication of NCM often met processing issues arising from incompatibility between inorganic nanofiller and polymeric membrane. Contemporary, functionalization of nanofiller which modify the surface properties of inorganic material using chemical agents is a viable approach and vigorously pursued to refine NCM processing and improve the odds of obtaining a defect-free high-performance membrane. This review highlights the recent progress on nanofiller functionalization employed in the fabrication of gas-separative NCMs. Apart from the different approaches used to obtain functionalized nanofiller (FN) with good dispersion in solvent and polymer matrix, this review discusses the implication of functionalization in altering the structure and chemical properties of nanofiller which favor interaction with specific gas species. These changes eventually led to the enhancement in the gas separation efficiency of NCMs. The most frequently used chemical agents are identified for each type of gas. Finally, the future perspective of gas-separative NCMs are highlighted.

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2

YANAGISAWA, Masaaki, Kazuo KATOH, and Kuniyuki KITAGAWA. "Separation of atomic vapor of lead in direct sampling of urine with a separative column atomizer." Analytical Sciences 6, no. 3 (1990): 471–72. http://dx.doi.org/10.2116/analsci.6.471.

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3

Nowik, Witold, Myriam Bonose, Sylvie Héron, Mateusz Nowik, and Alain Tchapla. "Assessment of Two-Dimensional Separative Systems Using the Nearest Neighbor Distances Approach. Part 2: Separation Quality Aspects." Analytical Chemistry 85, no. 20 (September 25, 2013): 9459–68. http://dx.doi.org/10.1021/ac4012717.

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4

Marques, Sara S., Inês I. Ramos, Sara R. Fernandes, Luisa Barreiros, Sofia A. C. Lima, Salette Reis, M. Rosário M. Domingues, and Marcela A. Segundo. "Insights on Ultrafiltration-Based Separation for the Purification and Quantification of Methotrexate in Nanocarriers." Molecules 25, no. 8 (April 18, 2020): 1879. http://dx.doi.org/10.3390/molecules25081879.

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The evaluation of encapsulation efficiency is a regulatory requirement for the characterization of drug delivery systems. However, the difficulties in efficiently separating nanomedicines from the free drug may compromise the achievement of accurate determinations. Herein, ultrafiltration was exploited as a separative strategy towards the evaluation of methotrexate (MTX) encapsulation efficiency in nanostructured lipid carriers and polymeric nanoparticles. The effect of experimental conditions such as pH and the amount of surfactant present in the ultrafiltration media was addressed aiming at the selection of suitable conditions for the effective purification of nanocarriers. MTX-loaded nanoparticles were then submitted to ultrafiltration and the portions remaining in the upper compartment of the filtering device and in the ultrafiltrate were collected and analyzed by HPLC-UV using a reversed-phase (C18) monolithic column. A short centrifugation time (5 min) was suitable for establishing the amount of encapsulated MTX in nanostructured lipid carriers, based on the assumption that the free MTX concentration was the same in the upper compartment and in the ultrafiltrate. The defined conditions allowed the efficient separation of nanocarriers from the free drug, with recoveries of >85% even when nanoparticles were present in cell culture media and in pig skin surrogate from permeation assays.

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Washino, Takehiro, Mikihide Demura, Shintaro Morisada, Keisuke Ohto, and Hidetaka Kawakita. "Separation of Microalgae by a Dynamic Bed of Magnetite-Containing Gel in the Application of a Magnetic Field." Separations 9, no. 5 (May 12, 2022): 120. http://dx.doi.org/10.3390/separations9050120.

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Microalgae are now known as potential microorganisms in the production of chemicals, fuel, and food. Since microalgae live in the sea and the river, they need to be harvested and separated and cultured for further usage. In this study, to separate microalgae, a bed of magnetite-containing gel (Mag gel, 190 µm) was packed in the column by the application of a magnetic field for the separative elution of injected microalgae (including mainly four species), cultured at Saga University in Japan. The applied magnetic field was set at a constant and dynamic-convex manner. At a constant magnetic field of 0.4–1.1 T, the elution percentage of the microalgae at less than 5 µm was 30–50%. At 1.1 T, the larger-sized microalgae were eluted at a percentage of 20%, resulting in the structural change of the bed by the applied magnetic field. In a convex-like change of the magnetic field at 1.1 T ⇄ 0.4 T, the smaller-sized microalgae were selectively eluted, whereas at 1.1 T ⇄ 0.8 T, the larger-sized microalgae were eluted. Dynamic convex-like changes by the magnetic field selectively eluted the microalgae, leading to the separation and the extraction of potential microalgae.

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KITAGAWA, Kuniyuki, Tetsuya TAKEUCHI, and Masaaki YANAGISAWA. "Retention characteristics of a separative column atomizer for atomic absorption spectrometry." Analytical Sciences 5, no. 4 (1989): 445–48. http://dx.doi.org/10.2116/analsci.5.445.

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7

Temporini, Caterina, Enrica Calleri, Gloria Brusotti, and Gabriella Massolini. "Protein-Labs on Separative Analytical Scale in Medicinal Chemistry: from the Proof of Concept to Applications." Current Organic Chemistry 20, no. 11 (March 3, 2016): 1169–85. http://dx.doi.org/10.2174/1385272819666150810220825.

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8

Arora, M. B., J. A. Hestekin, S. W. Snyder, E. J. St. Martin, Y. J. Lin, M. I. Donnelly, and C. Sanville Millard. "The Separative Bioreactor: A Continuous Separation Process for the Simultaneous Production and Direct Capture of Organic Acids." Separation Science and Technology 42, no. 11 (July 2007): 2519–38. http://dx.doi.org/10.1080/01496390701477238.

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9

Ruthven, Douglas M. "CO2 capture: Value functions, separative work and process economics." Chemical Engineering Science 114 (July 2014): 128–33. http://dx.doi.org/10.1016/j.ces.2014.04.020.

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10

de Andrés, Fernando, and Ángel Ríos. "Carbon dots – Separative techniques: Tools-objective towards green analytical nanometrology focused on bioanalysis." Microchemical Journal 161 (February 2021): 105773. http://dx.doi.org/10.1016/j.microc.2020.105773.

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11

Tang, Cong-Ming, and Xin-Li Li. "Separative capability of γ-Al2O3 porous ceramic membrane modified by ZIF-8." Korean Journal of Chemical Engineering 30, no. 5 (April 1, 2013): 1119–24. http://dx.doi.org/10.1007/s11814-013-0026-7.

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12

Borisevich, V. D., V. D. Borman, S. V. Bogovalov, V. A. Kislov, V. N. Tronin, I. V. Tronin, V. I. Abramov, and S. V. Yupatov. "On a Formula to Evaluate the Separative Power of Long Gas Centrifuges." Separation Science and Technology 49, no. 3 (January 17, 2014): 329–34. http://dx.doi.org/10.1080/01496395.2013.851697.

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13

Eccles, H., and A. Rushton. "Separative Technologies for the Removal of Thorium from an Acidic Waste Liquor." Separation Science and Technology 28, no. 1-3 (January 1993): 59–79. http://dx.doi.org/10.1080/01496399308019479.

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14

Zhu, Jianfeng, Pei Shi, Fen Wang, Ting Zhao, and Hao Jiang. "Preparation of separative-phase fancy glaze derived from iron ore slag." Ceramics International 42, no. 4 (March 2016): 5250–57. http://dx.doi.org/10.1016/j.ceramint.2015.12.052.

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15

Radu, Elena Ruxandra, and Stefan Ioan Voicu. "Functionalized Hemodialysis Polysulfone Membranes with Improved Hemocompatibility." Polymers 14, no. 6 (March 11, 2022): 1130. http://dx.doi.org/10.3390/polym14061130.

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The field of membrane materials is one of the most dynamic due to the continuously changing requirements regarding the selectivity and the upgradation of the materials developed with the constantly changing needs. Two membrane processes are essential at present, not for development, but for everyday life—desalination and hemodialysis. Hemodialysis has preserved life and increased life expectancy over the past 60–70 years for tens of millions of people with chronic kidney dysfunction. In addition to the challenges related to the efficiency and separative properties of the membranes, the biggest challenge remained and still remains the assurance of hemocompatibility—not affecting the blood during its recirculation outside the body for 4 h once every two days. This review presents the latest research carried out in the field of functionalization of polysulfone membranes (the most used polymer in the preparation of membranes for hemodialysis) with the purpose of increasing the hemocompatibility and efficiency of the separation process itself with a decreasing impact on the body.

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16

Foulon, C., J. Tedou, T. Queruau Lamerie, C. Vaccher, J. P. Bonte, and J. F. Goossens. "Assessment of the complexation degree of camptothecin derivatives and cyclodextrins using spectroscopic and separative methodologies." Tetrahedron: Asymmetry 20, no. 21 (November 2009): 2482–89. http://dx.doi.org/10.1016/j.tetasy.2009.10.029.

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17

Nowik, Witold, Sylvie Héron, Myriam Bonose, Mateusz Nowik, and Alain Tchapla. "Assessment of Two-Dimensional Separative Systems Using Nearest-Neighbor Distances Approach. Part 1: Orthogonality Aspects." Analytical Chemistry 85, no. 20 (September 25, 2013): 9449–58. http://dx.doi.org/10.1021/ac4012705.

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18

Sharma, Durlubh Kumar, and Heena Dhawan. "Separative Refining of Coals through Solvolytic Extraction under Milder Conditions: A Review." Industrial & Engineering Chemistry Research 57, no. 25 (June 15, 2018): 8361–80. http://dx.doi.org/10.1021/acs.iecr.8b00345.

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19

Gibbons, Dick. "Energy efficiency in cleanrooms and separative devices: ISO 14644-16, outreach article." Journal of the IEST 63, no. 1 (December 1, 2020): 91–95. http://dx.doi.org/10.17764/1557-2196-63.1.

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Abstract The ISO 14644 family of cleanroom standards has been at the center of international cleanroom standards development for many years and covers most facets of cleanroom activity and cleanroom types from large ballroom cleanrooms to isolators and clean tunnels. The series is under constant review and is still expanding. Recent documents that have been released concern the quantification of airborne and surface chemical concentrations, nanoparticles and the selection and testing of equipment used within these rooms. However, apart from some misleading information in the original Part 4 design document, questions concerning the energy demands from air purification processing have been overlooked. Nationally, institutions such as the BSI in UK, DIN- VDI in Germany and IEST in the USA have produced limited information on the topic, but Part 16 is the first standard to be internationally agreed upon. The key new features of the standard are a) the preparation of an accurate User Requirement Specification (URS), b) a practical method for estimating the volume of supply air needed to maintain the specified ISO room classifications in operation, c) tuning and d) benchmarking. An informative annex develops three useful metrics for benchmarking: power intensity for contamination removal (PICR), fan energy intensity for contamination removal (EICR) and energy intensity (EI).

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20

YANAGISAWA, Masaaki, Keiichi IDA, and Kuniyuki KITAGAWA. "Direct determination of mercury in rat tissues by atomic absorption spectrometry with a separative column atomizer." Analytical Sciences 5, no. 6 (1989): 765–66. http://dx.doi.org/10.2116/analsci.5.765.

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21

Chylewska, Agnieszka, Małgorzata Ogryzek, and Mariusz Makowski. "Modern Approach to Medical Diagnostics - the Use of Separation Techniques in Microorganisms Detection." Current Medicinal Chemistry 26, no. 1 (March 14, 2019): 121–65. http://dx.doi.org/10.2174/0929867324666171023164813.

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Background:Analytical chemistry and biotechnology as an interdisciplinary fields of science have been developed during many years and are experiencing significant growth, to cover a wide range of microorganisms separation techniques and methods, utilized for medical therapeutic and diagnostic purposes. Currently scientific reports contribute by introducing electrophoretical and immunological methods and formation of devices applied in food protection (avoiding epidemiological diseases) and healthcare (safety ensuring in hospitals).Methods:Electrophoretic as well as nucleic-acid-based or specific immunological methods have contributed tremendously to the advance of analyses in recent three decades, particularly in relation to bacteria, viruses and fungi identifications, especially in medical in vitro diagnostics, as well as in environmental or food protection.Results:The paper presents the pathogen detection competitiveness of these methods against conventional ones, which are still too time consuming and also labor intensive. The review is presented in several parts following the current trends in improved pathogens separation and detection methods and their subsequent use in medical diagnosis.Discussion:Part one, consists of elemental knowledge about microorganisms as an introduction to their characterization: descriptions of divisions, sizes, membranes (cells) components. Second section includes the development, new technological and practical solution descriptions used in electrophoretical procedures during microbes analyses, with special attention paid to bio-samples analyses like blood, urine, lymph or wastewater. Third part covers biomolecular areas that have created a basis needed to identify the progress, limitations and challenges of nucleic-acid-based and immunological techniques discussed to emphasize the advantages of new separative techniques in selective fractionating of microorganisms.

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22

Casas-Ferreira, Ana María, Miguel del Nogal-Sánchez, José Luis Pérez-Pavón, and Bernardo Moreno-Cordero. "Non-separative mass spectrometry methods for non-invasive medical diagnostics based on volatile organic compounds: A review." Analytica Chimica Acta 1045 (January 2019): 10–22. http://dx.doi.org/10.1016/j.aca.2018.07.005.

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23

Delbeke, Jochen F. A. "Theoretical Analysis To Assess the Separative Power of Reconfigured Cascades of Predesigned Gas Centrifuges." Industrial & Engineering Chemistry Research 48, no. 10 (May 20, 2009): 4960–65. http://dx.doi.org/10.1021/ie8011006.

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24

Tsapiuk, Eugene, and Ludmyla Melnyk. "Homoporous and heteroporous membrane models in describing key separative parameters of semipermeable membranes." Desalination 184, no. 1-3 (November 2005): 89–97. http://dx.doi.org/10.1016/j.desal.2005.03.066.

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25

BONINA, F., L. MONTENEGRO, C. LA ROSA, F. GASPARRI, and R. LEONARDI. "Comparison of different separative techniques in the quantitative determination of active compound enclosed in liposomal systems." International Journal of Cosmetic Science 16, no. 5 (October 1994): 183–97. http://dx.doi.org/10.1111/j.1467-2494.1994.tb00096.x.

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26

Fang, Yueyun, Qizhang Huang, Pengyi Liu, Jifu Shi, and Gang Xu. "Easy-separative MoS2-glue sponges with high-efficient dye adsorption and excellent reusability for convenient water treatment." Colloids and Surfaces A: Physicochemical and Engineering Aspects 540 (March 2018): 112–22. http://dx.doi.org/10.1016/j.colsurfa.2018.01.001.

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27

Lim, Huaixun, Kunli Goh, Miao Tian, and Rong Wang. "Membrane-based air dehumidification: A comparative review on membrane contactors, separative membranes and adsorptive membranes." Chinese Journal of Chemical Engineering 41 (January 2022): 121–44. http://dx.doi.org/10.1016/j.cjche.2021.12.018.

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28

María Casas-Ferreira, Ana, Miguel del Nogal Sánchez, Encarnación Rodríguez-Gonzalo, and José Luis Pérez Pavón. "Non-separative determination of isomeric polycyclic aromatic hydrocarbons by electrospray Ag(I) cationization mass spectrometry and multivariate calibration." Microchemical Journal 183 (December 2022): 108072. http://dx.doi.org/10.1016/j.microc.2022.108072.

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29

Clarizia, Gabriele, and Paola Bernardo. "Polyether Block Amide as Host Matrix for Nanocomposite Membranes Applied to Different Sensitive Fields." Membranes 12, no. 11 (November 3, 2022): 1096. http://dx.doi.org/10.3390/membranes12111096.

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The cornerstones of sustainable development require the treatment of wastes or contaminated streams allowing the separation and recycling of useful substances by a more rational use of energy sources. Separation technologies play a prominent role, especially when conducted by inherently environmentally friendly systems such as membrane operations. However, high-performance materials are more and more needed to improve the separative performance of polymeric materials nanocomposites are ideally suited to develop advanced membranes by combining organic polymers with suitable fillers having superior properties. In this area, polyether block amide copolymers (Pebax) are increasingly adopted as host matrices due to their distinctive properties in terms of being lightweight and easy to process, having good resistance to most chemicals, flexibility and high strength. In this light, the present review seeks to provide a comprehensive examination of the progress in the development of Pebax-based nanocomposite films for their application in several sensitive fields, that are challenging and at the same time attractive, including olefin/paraffin separation, pervaporation, water treatment, flexible films for electronics, electromagnetic shielding, antimicrobial surfaces, wound dressing and self-venting packaging. It covers a wide range of materials used as fillers and analyzes the properties of the derived nanocomposites and their performance. The general principles from the choice of the material to the approaches for the heterogeneous phase compatibilization as well as for the performance improvement were also surveyed. From a detailed analysis of the current studies, the most effective strategies to overcome some intrinsic limitations of these nanocomposites are highlighted, providing guidelines for the correlated research.

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30

Yu, Jiahuan, Guosheng Gao, Bo Sun, Lingyan Liang, Qiang Shen, Yang Zhang, and Hongtao Cao. "Optimization of sensing-pad functionalizing strategy toward separative extended-gate FET biosensors for PSA detection." Journal of Pharmaceutical and Biomedical Analysis 211 (March 2022): 114597. http://dx.doi.org/10.1016/j.jpba.2022.114597.

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31

KITAGAWA, Kuniyuki, Akihiko MIZUTANI, and Masaaki YANAGISAWA. "Separative column atomizer attached to atmospheric pressure helium microwave-induced plasma for direct trace element analysis by atomic emission spectrometry." Analytical Sciences 5, no. 5 (1989): 539–44. http://dx.doi.org/10.2116/analsci.5.539.

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32

Martín Santos, Patricia, Miguel del Nogal Sánchez, José Luis Pérez Pavón, and Bernardo Moreno Cordero. "Quantitative and qualitative analysis of polycyclic aromatic hydrocarbons in urine samples using a non-separative method based on mass spectrometry." Talanta 181 (May 2018): 373–79. http://dx.doi.org/10.1016/j.talanta.2018.01.032.

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33

Yu, Haiyan, Patrick Chaimbault, Igor Clarot, Zilin Chen, and Pierre Leroy. "Labeling nitrogen species with the stable isotope 15N for their measurement by separative methods coupled with mass spectrometry: A review." Talanta 191 (January 2019): 491–503. http://dx.doi.org/10.1016/j.talanta.2018.09.011.

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34

Ma, Xiao-Hua, Xin Wen, and Zhen-Liang Xu. "Reactive Distillation Performance of Difunctional Hollow Fiber Composite Membranes with Catalytic and Separative Properties as Structured Packing." Industrial & Engineering Chemistry Research 52, no. 17 (April 22, 2013): 5958–66. http://dx.doi.org/10.1021/ie301016w.

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35

Otani, Akihito, Yong Zhang, Tatsuya Matsuki, Eiji Kamio, Hideto Matsuyama, and Edward J. Maginn. "Molecular Design of High CO2 Reactivity and Low Viscosity Ionic Liquids for CO2 Separative Facilitated Transport Membranes." Industrial & Engineering Chemistry Research 55, no. 10 (March 7, 2016): 2821–30. http://dx.doi.org/10.1021/acs.iecr.6b00188.

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36

Gualtieri, Elena, Roberta De Filippis, and Silvia Vayr. "I modelli teorici di matrice cognitivista nella consulenza tecnica in ambito civile nei casi di separazione divorzio: riflessioni ed esemplificazioni cliniche." QUADERNI DI PSICOTERAPIA COGNITIVA, no. 50 (August 2022): 115–31. http://dx.doi.org/10.3280/qpc50-2022oa14084.

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L'articolo valuta il ruolo dell'esperto impegnato nelle consulenze tecniche, nell'ambito delle vicende separative. Vengono analizzati gli strumenti a supporto del lavoro clinico forense e i modelli tecnico-teorici dei terapeuti cognitivisti che lavorano in questo ambito. Le autrici propongono il tema della valutazione della genitorialità, con particolare attenzione alla teoria dell'attaccamento, al modello dinamico-maturativo e al primario interesse del minore. Seguendo il modello cognitivista evoluzionista e quello post-razionalista, viene poi sottolineato il ruolo della relazione e del processo conoscitivo narrativo. Vengono messe in luce altresì le principali criticità che lo psicologo forense può dover affrontare in un contesto denso di conflittualità, come quello delle separazioni. Vengono affrontati i temi centrali da esplorare in CTU e gli interventi che si possono attuare durante l'iter peritale, al fine di promuovere il riconoscimento e la condivisione della sofferenza, oltre che la cooperazione, ritenuti elementi centrali del buon esito della consulenza. Vengono affrontati due casi clinici-forensi, rileggendoli alla luce dei modelli proposti. Le autrici auspicano inoltre che i professionisti in ambito forense acquisiscano competenze e riflessività sulle ricadute del proprio agire professionale, sufficienti a perseguire lo scopo, ovvero il benessere del minore e della famiglia.

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Martín Santos, Patricia, Miguel del Nogal Sánchez, José Luis Pérez Pavón, and Bernardo Moreno Cordero. "Non-separative method based on a single quadrupole mass spectrometer for the semi-quantitative determination of amino acids in saliva samples. A preliminary study." Talanta 208 (February 2020): 120381. http://dx.doi.org/10.1016/j.talanta.2019.120381.

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38

Cho, Won-Ju, and Cheol-Min Lim. "Sensing properties of separative paper-based extended-gate ion-sensitive field-effect transistor for cost effective pH sensor applications." Solid-State Electronics 140 (February 2018): 96–99. http://dx.doi.org/10.1016/j.sse.2017.10.025.

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39

Yates, Edwin, and Andrew Yates. "Johann Peter Griess FRS (1829–88): Victorian brewer and synthetic dye chemist." Notes and Records: the Royal Society Journal of the History of Science 70, no. 1 (December 16, 2015): 65–81. http://dx.doi.org/10.1098/rsnr.2015.0020.

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The German organic chemist Johann Peter Griess (1829–88), who first developed the diazotization of aryl amines (the key reaction in the synthesis of the azo dyes), and a major figure in the formation of the modern dye industry, worked for more than a quarter of a century at the brewery of Samuel Allsopp and Sons in Burton upon Trent, which, owing to the presence of several notable figures and an increase in the scientific approach to brewing, became a significant centre of scientific enquiry in the 1870s and 1880s. Unlike the other Burton brewing chemists, Griess paralleled his work at the brewery with significant contributions to the chemistry of synthetic dyes, managing to keep the two activities separate—to the extent that some of his inventions in dye chemistry were filed as patents on behalf of the German dye company BASF, without the involvement of Allsopp's. This seemingly unlikely situation can be explained partly by the very different attitudes to patent protection in Britain and in Germany combined with an apparent indifference to the significant business opportunity that the presence of a leading dye chemist presented to Allsopp's. Although his work for the brewery remained largely proprietary, Griess's discoveries in dye chemistry were exploited by the German dye industry, which quickly outpaced its British counterpart. One less well-known connection between brewing and synthetic dyes, and one that may further explain Allsopp's attitude, is the use of synthetic dyes in identifying microorganisms—the perennial preoccupation of brewers seeking to maintain yield and quality. Developments of Griess's original work continue to be applied to many areas of science and technology.

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40

Zappi, Alessandro, Valentina Marassi, Stefano Giordani, Nicholas Kassouf, Barbara Roda, Andrea Zattoni, Pierluigi Reschiglian, and Dora Melucci. "Extracting Information and Enhancing the Quality of Separation Data: A Review on Chemometrics-Assisted Analysis of Volatile, Soluble and Colloidal Samples." Chemosensors 11, no. 1 (January 4, 2023): 45. http://dx.doi.org/10.3390/chemosensors11010045.

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Instrument automation, technological advancements and improved computational power made separation science an extremely data-rich approach, requiring the use of statistical and data analysis tools that are able to optimize processes and combine multiple outputs. The use of chemometrics is growing, greatly improving the ability to extract meaningful information. Separation–multidetection generates multidimensional data, whose elaboration should not be left to the discretion of the operator. However, some applications or techniques still suffer from the lack of method optimization through DoE and downstream multivariate analysis, limiting their potential. This review aims at summarizing how chemometrics can assist analytical chemists in terms of data elaboration and method design, focusing on what can be achieved by applying chemometric approaches to separation science. Recent applications of chemometrics in separation analyses, in particular in gas, liquid and size-exclusion chromatography, together with field flow fractionation, will be detailed to visualize the state of the art of separation chemometrics, encompassing volatile, soluble and solid (colloidal) analytes. The samples considered will range from food chemistry and environmental chemistry to bio/pharmaceutical science.

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41

Yonny, Melisa E., Ariel Rodríguez Torressi, Mónica A. Nazareno, and Soledad Cerutti. "Development of a Novel, Sensitive, Selective, and Fast Methodology to Determine Malondialdehyde in Leaves of Melon Plants by Ultra-High-Performance Liquid Chromatography-Tandem Mass Spectrometry." Journal of Analytical Methods in Chemistry 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/4327954.

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Early production of melon plant(Cucumis melo)is carried out using tunnels structures, where extreme temperatures lead to high reactive oxygen species production and, hence, oxidative stress. Malondialdehyde (MDA) is a recognized biomarker of the advanced oxidative status in a biological system. Thus a reliable, sensitive, simple, selective, and rapid separative strategy based on ultra-high-performance liquid chromatography coupled to positive electrospray-tandem mass spectrometry (UPLC-(+)ESI-MS/MS) was developed for the first time to measure MDA, without derivatization, in leaves of melon plants exposed to stress conditions. The detection and quantitation limits were 0.02 μg·L−1and 0.08 μg·L−1, respectively, which was demonstrated to be better than the methodologies currently reported in the literature. The accuracy values were between 96% and 104%. The precision intraday and interday values were 2.7% and 3.8%, respectively. The optimized methodology was applied to monitoring of changes in MDA levels between control and exposed to thermal stress conditions melon leaves samples. Important preliminary conclusions were obtained. Besides, a comparison between MDA levels in melon leaves quantified by the proposed method and the traditional thiobarbituric acid reactive species (TBARS) approach was undertaken. The MDA determination by TBARS could lead to unrealistic conclusions regarding the oxidative stress status in plants.

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Pascali, Jennifer P., Paolo Fais, Fabio Vaiano, Alice Ciolini, and Elisabetta Bertol. "Zwitterionic HILIC stationary phase as a valuable alternative in separative techniques: Application to the analysis of gamma-hydroxybutyric acid and its metabolite in hair." Journal of Chromatography B 1134-1135 (December 2019): 121876. http://dx.doi.org/10.1016/j.jchromb.2019.121876.

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Martin, Erik W., and Alex S. Holehouse. "Intrinsically disordered protein regions and phase separation: sequence determinants of assembly or lack thereof." Emerging Topics in Life Sciences 4, no. 3 (October 20, 2020): 307–29. http://dx.doi.org/10.1042/etls20190164.

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Intrinsically disordered protein regions (IDRs) — regions that do not fold into a fixed three-dimensional structure but instead exist in a heterogeneous ensemble of conformations — have recently entered mainstream cell biology in the context of liquid–liquid phase separation (LLPS). IDRs are frequently found to be enriched in phase-separated compartments. Due to this observation, the presence of an IDR in a protein is frequently assumed to be diagnostic of its ability to phase separate. In this review, we clarify the role of IDRs in biological assembly and explore the physical principles through which amino acids can confer the attractive molecular interactions that underlie phase separation. While some disordered regions will robustly drive phase separation, many others will not. We emphasize that rather than ‘disorder' driving phase separation, multivalency drives phase separation. As such, whether or not a disordered region is capable of driving phase separation will depend on the physical chemistry encoded within its amino acid sequence. Consequently, an in-depth understanding of that physical chemistry is a prerequisite to make informed inferences on how and why an IDR may be involved in phase separation or, more generally, in protein-mediated intermolecular interactions.

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Bruni, Silvia, and Vittoria Guglielmi. "Identification of archaeological triterpenic resins by the non-separative techniques FTIR and 13C NMR: The case of Pistacia resin (mastic) in comparison with frankincense." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 121 (March 2014): 613–22. http://dx.doi.org/10.1016/j.saa.2013.10.098.

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Sheng, Shiqi, Haijun Yang, Yongshun Song, Ruoyang Chen, Shanshan Liang, and Haiping Fang. "Size-Dependent Spontaneous Separation of Colloidal Particles in Sub-Microliter Suspension by Cations." International Journal of Molecular Sciences 23, no. 15 (July 22, 2022): 8055. http://dx.doi.org/10.3390/ijms23158055.

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Great efforts have been made to separate micro/nanoparticles in small-volume specimens, but it is a challenge to achieve the simple, maneuverable and low-cost separation of sub-microliter suspension with large separation distances. By simply adding trace amounts of cations (Mg2+/Ca2+/Na+), we experimentally achieved the size-dependent spontaneous separation of colloidal particles in an evaporating droplet with a volume down to 0.2 μL. The separation distance was at a millimeter level, benefiting the subsequent processing of the specimen. Within only three separating cycles, the mass ratio between particles with diameters of 1.0 μm and 0.1 μm can be effectively increased to 13 times of its initial value. A theoretical analysis indicates that this spontaneous separation is attributed to the size-dependent adsorption between the colloidal particles and the aromatic substrate due to the strong hydrated cation-π interactions.

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YOSHIZUKA, Kazuharu. "Progress of Computational Chemistry in Separation Chemistry." Journal of Ion Exchange 14, no. 1 (2003): 30–37. http://dx.doi.org/10.5182/jaie.14.30.

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Sabarni, Sabarni. "STRUKTUR ATOM BERDASARKAN ILMU KIMIA DAN PERSPEKTIF AL-QURAN." Lantanida Journal 7, no. 1 (July 9, 2019): 87. http://dx.doi.org/10.22373/lj.v7i1.4647.

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The atomic structure is one of the chemical metrics studied in high schools and universities. The concept of atomic structure in learning chemistry in schools and universities is usually not associated with religion, especially the Qur'an, so as if learning atomic structure is a separate science and has no connection with the Qur'an. To show that the Qur'an is a guideline for humanity, including examining the natural sciences including chemistry, the authors want to examine the concept of atomic structure based on chemistry and the perspective of the Qur'an which aims to determine the concept of the development of atomic models, particles basic and electron configurations based on chemistry and the Qur'anic perspective. The data collection technique used in this study is literature (Library Research), namely studying the Qur’an and studying reading books, journals, dictates, dictionaries, and scientific works. From this study shows that the Qur'an has been proven to explain the concept of atomic structure first and in the Qur'an there is the concept of atomic structure which is in line with the chemical concept proposed by chemists.

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Wang, Wenhui, Zheng Li, Chunli Song, Jie Yang, and Yingwei Yang. "Separation of Low-Molecular-Weight Organics by Water-Soluble Macrocyclic Arenes." Molecules 27, no. 23 (December 5, 2022): 8554. http://dx.doi.org/10.3390/molecules27238554.

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In this study, we fabricate a series of water-soluble anionic macrocyclic arenes, including pillar[5]arene (WP5), pillar[6]arene (WP6), leaning pillar[6]arene (WLT6), and biphenyl-extended pillar[6]arene (WBpP6), which show different separation capabilities toward low-molecular-weight organics, such as short chain haloalkanes, cyclic aliphatics, and aromatics, in water. The liquid–liquid distribution experiments are carried out at room temperature. The separation factor for low-molecular-weight organics is evaluated in the extraction of equimolar mixtures. WP6 demonstrates a high extraction efficiency of up to 89% in separating toluene/methylcyclohexane mixtures. These adsorbents also have the advantages of rapid adsorption, high separation efficiency, remarkable selectivity, and good recyclability. This work not only expands the application scope of macrocyclic chemistry, but also has practical research value for organics separation and water purification.

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Lim, XiaoZhi. "Chemistry: Degrees of separation." Nature 520, no. 7548 (April 2015): 426–27. http://dx.doi.org/10.1038/520426a.

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Lavine, Marc S. "Separating chemistry from mechanics." Science 355, no. 6332 (March 30, 2017): 1387.3–1388. http://dx.doi.org/10.1126/science.355.6332.1387-c.

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