Chromatography (Basel)最新文献_第4页

Ultrasound-assisted QuEChERS-based extraction using EDTA for determination of currently-used pesticides at trace levels in soil. 使用 EDTA 进行超声辅助 QuEChERS 萃取，测定土壤中痕量水平的当前使用的农药。

IF 5.8

Chromatography (Basel) Pub Date : 2022-03-03 DOI: 10.1007/s11356-022-19397-3

Florent Lafay, Gaëlle Daniele, Maëva Fieu, Céline Pelosi, Clémentine Fritsch, Emmanuelle Vulliet

{"title":"Ultrasound-assisted QuEChERS-based extraction using EDTA for determination of currently-used pesticides at trace levels in soil.","authors":"Florent Lafay, Gaëlle Daniele, Maëva Fieu, Céline Pelosi, Clémentine Fritsch, Emmanuelle Vulliet","doi":"10.1007/s11356-022-19397-3","DOIUrl":"10.1007/s11356-022-19397-3","url":null,"abstract":"It is essential to monitor pesticides in soils as their presence at trace levels and their bioavailability can induce adverse effects on soil's ecosystems, animals, and human health. In this study, we developed an analytical method for the quantification of traces of multi-class pesticides in soil using liquid chromatography-tandem mass spectrometry. In this way, 31 pesticides were selected, including 12 herbicides, 9 insecticides, and 10 fungicides. Two extraction techniques were first evaluated, namely, the pressurized liquid extraction and the QuEChERS procedure. The latest one was finally selected and optimized, allowing extraction recoveries of 55 to 118%. The role of the chelating agent EDTA, which binds preferentially to soil cations that complex some pesticides, was highlighted. Coupled with liquid chromatography-tandem mass spectrometry, the procedure displayed very high sensitivity, with limits of quantification (LOQ) in the range 0.01-5.5 ng/g. A good linearity (R2 > 0.992) was observed over two orders of magnitude (LOQ-100 [Formula: see text] LOQ) with good accuracy (80-120%) for all compounds except the two pyrethroids lambda-cyhalothrin and tau-fluvalinate (accuracy comprised between 50 and 175%) and the cyclohexanedione cycloxydim (accuracy < 35%). Good repeatability and reproducibility were also achieved. The method was finally successfully applied to 12 soil samples collected from 3 land-use types. Among the 31-targeted pesticides, 24 were detected at least once, with concentration levels varying from LOQ to 722 ng/g. Many values were below 0.5 ng/g, indicating that the developed method could provide new knowledge on the extremely low residual contents of some pesticides.","PeriodicalId":91226,"journal":{"name":"Chromatography (Basel)","volume":"37 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2022-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89215840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Studies on π Interactions in Liquid-phase Separations 液相分离中π相互作用的研究

Chromatography (Basel) Pub Date : 2022-02-04 DOI: 10.15583/jpchrom.2021.021

Eisuke Kanao

{"title":"Studies on π Interactions in Liquid-phase Separations","authors":"Eisuke Kanao","doi":"10.15583/jpchrom.2021.021","DOIUrl":"https://doi.org/10.15583/jpchrom.2021.021","url":null,"abstract":"π interactions have recently received considerable attentions due to principal factor governing molecular recognitions and self-assemble abilities, as accumulated in the database on proximate arrangements in structures of biological systems and organic functional materials. Therefore, further deep understanding and control of π interactions will greatly facilitate the development of new functional materials. Despite the importance of π interactions, they are still challenging to study because π interactions are much weaker than most other molecular interactions, such as hydrophobic interaction, hydrogen bonding, and electrostatic bonding. On the other hand, liquid chromatography (LC) is a powerful separation technique, which is able to distinguish the partition coefficients of solutes between the mobile and stationary phases, and can sensitively reflect the strength of molecular interactions. We investigated the properties of π interactions by developing new silica-monolithic capillary columns modified with carbon materials providing strong π interactions. In this focusing review, we introduce a few specific π interactions by columns modified with fullerenes and polycyclic aromatic hydrocarbons (PAHs), which showed strong π - π interactions due to spherical recognition and multiple CH- π interactions. Furthermore, π interactions can contribute to the separation of various samples, which are difficult to achieve by the available retention mechanisms. Briefly, we applied various π interactions to specific separation analyses, and we succeeded in separating halogenated compounds, H/D isotopologue pairs, and saccharides by effective π interactions. These results indicates that π interactions contribute to practical separation science, such as removal of environmental pollutants and quantitative determination of medicinal compounds.","PeriodicalId":91226,"journal":{"name":"Chromatography (Basel)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47397186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Molecular Shape Selectivity for Polycyclic Aromatic Compounds on a Poly(benzoguanamine-co-melamine-co-formaldehyde) Stationary Phase in Reversed-Phase Liquid Chromatography 反相液相色谱中多环芳烃在聚（苯并胍胺-三聚氰胺-甲醛）固定相上的分子形状选择性

Chromatography (Basel) Pub Date : 2022-02-03 DOI: 10.15583/jpchrom.2022.001

Ohjiro Sumiya, Koki Nakagami, I. Ueta, Yoshihiro Saito

{"title":"Molecular Shape Selectivity for Polycyclic Aromatic Compounds on a Poly(benzoguanamine-co-melamine-co-formaldehyde) Stationary Phase in Reversed-Phase Liquid Chromatography","authors":"Ohjiro Sumiya, Koki Nakagami, I. Ueta, Yoshihiro Saito","doi":"10.15583/jpchrom.2022.001","DOIUrl":"https://doi.org/10.15583/jpchrom.2022.001","url":null,"abstract":"A novel spherical polymeric material has been introduced as a stationary phase in liquid chromatography (LC). Poly(benzoguanamine- co -melamine- co -formaldehyde) (BMF) was packed into a stainless-steel tube having 4.6 mm i.d., 150 mm length, as a particulate separation medium in LC. The retention behavior for polycyclic aromatic compounds (PACs) on the BMF phase was evaluated in reversed-phase LC and the trend was compared with that on a commercially-available octadecylsilica (ODS) phase. The BMF phase showed a unique molecular shape selectivity for PACs that was clearly different from that on typical ODS phases. The BMF stationary phase more strongly retained \"rod-like\" molecules such as naphthacene than \"square-like\" molecules with a relatively large molecular weight. From the results, it was considered that the phenyl groups as stationary phase ligands were exposed on the surface of BMF particles, and these phenyl functionalities were apart from each other. Therefore, the BMF phase strongly retained \"rod-like\" analyte molecules that can interact with more than one phenyl groups simultaneously of the stationary phase.","PeriodicalId":91226,"journal":{"name":"Chromatography (Basel)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49258823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of Novel Analysis and Characterization Methods Utilizing Reaction Dynamics in a Separation Capillary 利用分离毛细管中反应动力学的新分析和表征方法的发展

Chromatography (Basel) Pub Date : 2022-01-20 DOI: 10.15583/jpchrom.2021.022

T. Takayanagi

{"title":"Development of Novel Analysis and Characterization Methods Utilizing Reaction Dynamics in a Separation Capillary","authors":"T. Takayanagi","doi":"10.15583/jpchrom.2021.022","DOIUrl":"https://doi.org/10.15583/jpchrom.2021.022","url":null,"abstract":"Electrophoretic migration of an analyte in capillary electrophoresis (CE) reflects reaction dynamics of the analyte in solution. In affinity CE, an analyte of interest interacts with a modifier added in the separation buffer in fast equilibrium, and effective electrophoretic mobility of the analyte is contributed from its equilibrium species. Precise measurement of effective electrophoretic mobility allows analyzing the equilibrium. Analysis of equilibria under CE separation possesses several advantages against traditional analyses in homogeneous solution; coexisting substances including impurities and kinetically generated substances are resolved by CE from the equilibrium species of interest. Characteristics of the CE analysis have been applied to analyses of acid-base equilibria of degradable substances and ion-association equilibria in an aqueous solution. Since CE is operated in an open-tubular capillary, it is also suitable for the characterization of carbon nanoclusters such as graphene and carbon nanotube, and measurement of effective electrophoretic mobility helps characterization of nanoclusters. A novel analysis technique of capillary electrophoresis/dynamic frontal analysis (CE/DFA) has also been proposed for the analysis of such reactions as involving equilibria and kinetic reactions. In CE/DFA, kinetically generated product is continuously resolved from the equilibrium species, and a plateau signal would be detected when the reaction rate is constant. Michaelis-Menten constants have successfully been determined through the plateau height by CE/DFA. In this review, analysis and characterization methods utilizing reaction dynamics in a separation capillary are summarized.","PeriodicalId":91226,"journal":{"name":"Chromatography (Basel)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43045053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two-Dimensional High-Performance Liquid Chromatographic Determination of Chiral Amino Acids in Food Samples and Human Physiological Fluids Using Fluorescence Derivatization with 4-(N,N-Dimethylaminosulfonyl)-7-fluoro-2,1,3-benzoxadiazole 4-（N，N-二甲氨基磺酰基）-7-氟-2,1,3-苯并恶二唑荧光衍生二维高效液相色谱法测定食品和人体生理液中的手性氨基酸

Chromatography (Basel) Pub Date : 2022-01-15 DOI: 10.15583/jpchrom.2021.020

Aogu Furusho, Karina Akemy IKEJIRI, Chiharu Ishii, T. Akita, M. Mita, M. Nagano, T. Ide, K. Hamase

{"title":"Two-Dimensional High-Performance Liquid Chromatographic Determination of Chiral Amino Acids in Food Samples and Human Physiological Fluids Using Fluorescence Derivatization with 4-(N,N-Dimethylaminosulfonyl)-7-fluoro-2,1,3-benzoxadiazole","authors":"Aogu Furusho, Karina Akemy IKEJIRI, Chiharu Ishii, T. Akita, M. Mita, M. Nagano, T. Ide, K. Hamase","doi":"10.15583/jpchrom.2021.020","DOIUrl":"https://doi.org/10.15583/jpchrom.2021.020","url":null,"abstract":"A two-dimensional high-performance liquid chromatographic (2D-HPLC) system using the pre-column derivatization with 4-( N , N -dimethylaminosulfonyl)-7-fluoro-2,1,3-benzoxadiazole (DBD-F) has been developed for the determination of alanine (Ala), aspartic acid (Asp) and serine (Ser) enantiomers. For the precise determination of trace amounts of D -amino acids in complex matrices, a highly sensitive and selective method is required. In the present study, amino acids were derivatized with DBD-F for the sensitive fluorescence detection and were analyzed by a selective 2D-HPLC system combining a reversed-phase column (Singularity RP18, 1.0 x 500 mm) and an enantioselective column (Singularity CSP-001S, 1.5 x 250 mm). The established system was successfully applied to the chiral amino acid analyses of Japanese traditional amber rice vinegar, human plasma and human urine samples. In the Japanese traditional amber rice vinegar and human urine, relatively high amounts of all the target D -amino acids were observed (% D =5.8-37.7), while trace amounts of D -Ser and D -Ala were found in human plasma (% D =0.5-2.1).","PeriodicalId":91226,"journal":{"name":"Chromatography (Basel)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46383748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Enantiomeric Separation of 2-Hydroxyglutarate Using Chiral Mobile Phase Additives 用手性流动相添加剂分离2-羟基戊二酸对映体

Chromatography (Basel) Pub Date : 2021-12-24 DOI: 10.15583/jpchrom.2021.016

Takuma Ohtawa, M. Tsunoda

引用次数: 1

Elucidation of Factors for Chiral Conversion of α-Lipoic Acid in Dietary Supplement 膳食补充剂中α-脂肪酸手性转化因素的阐明

Chromatography (Basel) Pub Date : 2021-12-10 DOI: 10.15583/jpchrom.2021.019

Koichi Saito, Yukie Arima, Miho Morooka, Yoshiyuki Kobayashi, R. Ito

引用次数: 0

LVSEP Analysis of Phosphopeptides in Dynamically PVP-Coated Capillaries and Microchannels 动态pvp包被毛细血管和微通道中磷酸肽的LVSEP分析

Chromatography (Basel) Pub Date : 2021-11-12 DOI: 10.15583/jpchrom.2021.018

F. Kitagawa, Ayaka Hayashi, Isoshi Nukatsuka