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Journal articles on the topic 'Ekstrakcija (DLLME i QuEChERS)'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Yu, Ling, Guiquan Guo, Jun Zhao, Linnan Zhao, Aiqing Xia, Xu He, Cuijuan Xing, Lili Dong, and Fang Wang. "Determination of Organochlorine Pesticides in Green Leafy Vegetable Samples via Fe3O4 Magnetic Nanoparticles Modified QuEChERS Integrated to Dispersive Liquid-Liquid Microextraction Coupled with Gas Chromatography-Mass Spectrometry." Journal of Analytical Methods in Chemistry 2021 (March 13, 2021): 1–10. http://dx.doi.org/10.1155/2021/6622063.

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A fast method based on Fe3O4 magnetic nanoparticles (Fe3O4 MNPs) modified QuEChERS integrated to dispersive liquid-liquid microextraction (DLLME) coupled with gas chromatography-mass spectrometry was established for the determination of 8 organochlorine pesticides (OCPs) in green leafy vegetables. The factors involved in the purification by QuEChERS and concentration by DLLME were optimized. In the QuEChERS process, Fe3O4 MNPs were used as a new impurity adsorbent after the sample extraction procedure by acetonitrile, which achieved phase separation rapidly. Carbon black was used as an alternative to costly graphitized carbon black without affecting the recovery. In the process of DLLME, 1 mL of the extract obtained by QuEChERS was used as the dispersive solvent, 40 μL of chloroform was used as the extractive solvent, and 4 mL of water was added. Making them mix well, then the dispersed liquid-liquid microextraction concentration was subsequently carried out. The enrichment factors of 8 OCPs ranged from 22.8 to 36.6. The recoveries of the proposed method ranged from 78.6% to 107.7%, and the relative standard deviations were not more than 7.5%. The limits of detection and limits of quantification were 0.15–0.32 μg/kg and 0.45–0.96 μg/kg, respectively. The method has been successfully applied to the determination of OCPs in green leafy vegetable samples.

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2

Karami-Osboo, Rouhollah, Mohammad Hossein Shojaee, Ramin Miri, Farzad Kobarfard, and Katayoun Javidnia. "Simultaneous determination of six fluoroquinolones in milk by validated QuEChERS-DLLME HPLC-FLD." Anal. Methods 6, no. 15 (2014): 5632–38. http://dx.doi.org/10.1039/c4ay00848k.

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3

Andraščíková, Mária, Svetlana Hrouzková, and Sara C. Cunha. "Combination of QuEChERS and DLLME for GC-MS determination of pesticide residues in orange samples." Food Additives & Contaminants: Part A 30, no. 2 (February 2013): 286–97. http://dx.doi.org/10.1080/19440049.2012.736029.

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4

Nagyová, Slávka, and Peter Tölgyessy. "Validation Including Uncertainty Estimation of a GC–MS/MS Method for Determination of Selected Halogenated Priority Substances in Fish Using Rapid and Efficient Lipid Removing Sample Preparation." Foods 8, no. 3 (March 18, 2019): 101. http://dx.doi.org/10.3390/foods8030101.

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A rapid method is proposed for the determination of selected H2SO4 stable organic compounds—eight organochlorines (OCs; hexachloro-1,3-butadiene, pentachlorobenzene, hexachlorobenzene, hexachlorocyclohexane—HCH—isomers, heptachlor) and six polybrominated diphenyl ethers (PBDEs; BDE-28, 47, 99, 100, 153, 154)—in fish samples. In the method, a modified QuEChERS (quick, easy, cheap, effective, rugged and safe) sample preparation using pH-tuned dispersive liquid–liquid microextraction (DLLME) and H2SO4 digestion fish extract clean-up is followed by gas chromatography–triple quadrupole tandem mass spectrometry (GC–QqQ-MS/MS) analysis. The method was validated in terms of linearity, limits of the method, recovery, accuracy, analysis of standard reference material (NIST SRM 1946), and estimation of combined uncertainty of the measurement (top-down approach). For validation, chub composite samples were used, and subsequently, the method was successfully applied to analysis of real samples of eight fish species. Finally, the method passed the analytical Eco-Scale evaluation as “an acceptable green analysis method”, and showed its advantages (simplicity, rapidity, low cost, high extract clean-up efficiency, good sensitivity) when compared to other reported QuEChERS based methods.

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5

Kim, Beom Hee, Wonwoong Lee, You Lee Kim, Ji Hyun Lee, and Jongki Hong. "Efficient Matrix Cleanup of Soft-Gel-Type Dietary Supplements for Rapid Screening of 92 Illegal Adulterants Using EMR-Lipid dSPE and UHPLC-Q/TOF-MS." Pharmaceuticals 14, no. 6 (June 15, 2021): 570. http://dx.doi.org/10.3390/ph14060570.

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An efficient matrix cleanup method was developed for the rapid screening of 92 illegal adulterants (25 erectile dysfunction drugs, 15 steroids, seven anabolic steroids, 12 antihistamines, 12 nonsteroidal anti-inflammatory drugs (NSAIDs), four diuretics, and 17 weight-loss drugs) in soft-gel-type supplements by ultra-high performance liquid chromatography-quadrupole/time of flight-mass spectrometry (UHPLC-Q/TOF-MS). As representative green chemistry methods, three sample preparation methods (dispersive liquid-liquid microextraction (DLLME), “quick, easy, cheap, effective, rugged, and safe” dispersive solid-phase extraction (QuEChERS-dSPE), and enhanced matrix removal-lipid (EMR-Lipid) dSPE) were evaluated for matrix removal efficiency, recovery rate, and matrix effect. In this study, EMR-Lipid dSPE was shown to effectively remove complicated matrix contents in soft-gels, compared to DLLME and QuEChERS-dSPE. For the rapid screening of a wide range of adulterants, extracted common ion chromatogram (ECIC) and neutral loss scan (NLS) based on specific common MS/MS fragments were applied to randomly collected soft-gel-type dietary supplement samples using UHPLC-Q/TOF-MS. Both ECICs and NLSs enabled rapid and simple screening of multi-class adulterants and could be an alternative to the multiple reaction monitoring (MRM) method. The developed method was validated in terms of limit of detection (LOD), precision, accuracy, recovery, and matrix effects. The range of LODs was 0.1–16 ng/g. The overall precision values were within 0.09–14.65%. The accuracy ranged from 81.6% to 116.6%. The recoveries and matrix effects of 92 illegal adulterants ranged within 16.9–119.4% and 69.8–114.8%, respectively. The established method was successfully applied to screen and identify 92 illegal adulterants in soft-gels. This method can be a promising tool for the high-throughput screening of various adulterants in dietary supplements and could be used as a more environmentally friendly routine analytical method for screening dietary supplements illegally adulterated with multi-class drug substances.

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6

Szarka, Agneša, Kristína Búčiková, Ivana Kostić, and Svetlana Hrouzková. "Development of a Multiresidue QuEChERS–DLLME—Fast GC–MS Method for Determination of Selected Pesticides in Yogurt Samples." Food Analytical Methods 13, no. 10 (June 30, 2020): 1829–41. http://dx.doi.org/10.1007/s12161-020-01809-0.

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7

Okšová, Linda, and Peter Tölgyessy. "Determination of Hexabromocyclododecanes in Fish Using Modified QuEChERS Method with Efficient Extract Clean-Up Prior to Liquid Chromatography–Tandem Mass Spectrometry." Separations 7, no. 3 (August 6, 2020): 44. http://dx.doi.org/10.3390/separations7030044.

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A modified QuEChERS (quick, easy, cheap, effective, rugged, and safe) sample preparation method coupled with liquid chromatography–tandem mass spectrometry (LC–MS/MS) was proposed for the determination of α-, β-, and γ-hexabromocyclododecane (HBCD) diastereomers in whole-fish homogenate samples. The main modification of the QuEChERS method concerned a clean-up step in which the combination of pH-tuned dispersive liquid–liquid microextraction (DLLME) with 18.4 M H2SO4 digestion allowed to successfully eliminate the matrix substances from the final extract. For the target HBCDs, good response linearity was obtained with coefficients of determination (R2) >0.998 for the concentration range corresponding to 0.1–50 ng of analyte per g of sample. Limits of quantifications (LOQs) were 0.15–0.25 ng g−1 ww (wet weight), and the recoveries from samples spiked at levels of 0.5 and 5 ng g−1 ranged from 89% to 102% with relative standard deviations <7.5%. The accuracy of the method was verified by analysis of the NIST standard reference material SRM 1947, and a good agreement (90%) was obtained with the certified value for the α-HBCD present in the sample. Finally, the method was applied to the analysis of 293 fish samples collected in water bodies from all over Slovakia, in which the highest concentrations were determined for α-HBCD with the maximum value of 31 ng g−1 ww.

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8

Ma, Lingfei, Yanfei Wang, Haipu Li, Fangyuan Peng, Bo Qiu, and Zhaoguang Yang. "Development of QuEChERS-DLLME method for determination of neonicotinoid pesticide residues in grains by liquid chromatography-tandem mass spectrometry." Food Chemistry 331 (November 2020): 127190. http://dx.doi.org/10.1016/j.foodchem.2020.127190.

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9

Slámová, Tereza, Anna Sadowska-Rociek, Adéla Fraňková, Magdalena Surma, and Jan Banout. "Application of QuEChERS-EMR-Lipid-DLLME method for the determination of polycyclic aromatic hydrocarbons in smoked food of animal origin." Journal of Food Composition and Analysis 87 (April 2020): 103420. http://dx.doi.org/10.1016/j.jfca.2020.103420.

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10

Jovanov, Pavle, Valéria Guzsvány, Mladen Franko, Sanja Lazić, Marijana Sakač, Ivan Milovanović, and Nataša Nedeljković. "Development of multiresidue DLLME and QuEChERS based LC–MS/MS method for determination of selected neonicotinoid insecticides in honey liqueur." Food Research International 55 (January 2014): 11–19. http://dx.doi.org/10.1016/j.foodres.2013.10.031.

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11

Agus, Baizura Aya Putri, Norhayati Hussain, and Jinap Selamat. "Quantification of PAH4 in roasted cocoa beans using QuEChERS and dispersive liquid-liquid micro-extraction (DLLME) coupled with HPLC-FLD." Food Chemistry 303 (January 2020): 125398. http://dx.doi.org/10.1016/j.foodchem.2019.125398.

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12

Rai, Satyajeet, Abhishek Kumar Singh, Anshuman Srivastava, Sapna Yadav, Mohammed Haris Siddiqui, and Mohana Krishna Reddy Mudiam. "Comparative Evaluation of QuEChERS Method Coupled to DLLME Extraction for the Analysis of Multiresidue Pesticides in Vegetables and Fruits by Gas Chromatography-Mass Spectrometry." Food Analytical Methods 9, no. 9 (February 29, 2016): 2656–69. http://dx.doi.org/10.1007/s12161-016-0445-2.

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13

Lawal, Abubakar, Richard Chee Seng Wong, Guan Huat Tan, Lukman Bola Abdulra’uf, and Ali Mohamed Ali Alsharif. "Multi-pesticide Residues Determination in Samples of Fruits and Vegetables Using Chemometrics Approach to QuEChERS-dSPE Coupled with Ionic Liquid-Based DLLME and LC–MS/MS." Chromatographia 81, no. 5 (April 6, 2018): 759–68. http://dx.doi.org/10.1007/s10337-018-3511-7.

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14

Abdel Ghani, Sherif B., Saleh S. Alhewairini, and Svetlana Hrouzková. "A Fast and Easy QuEChERS-DLLME Method Combined with GC-MS for Ethion and Bifenthrin Residues Determination and Study of Their Dissipation Dynamics in Palm Dates." Food Analytical Methods 11, no. 12 (July 27, 2018): 3542–50. http://dx.doi.org/10.1007/s12161-018-1333-8.

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15

Zhao, Qin, Yi-Lian Zhou, Shi-Wen Yue, Yu-Jiao Lou, and Yu-Qi Feng. "Combination of Modified QuEChERS and Disposable Polyethylene Pipet Assisted DLLME Based on Low Density Solvent Extraction for Rapid and Sensitive Determination of Fipronil and Its Metabolites in Eggs by GC-MS." Food Analytical Methods 14, no. 5 (January 8, 2021): 1021–32. http://dx.doi.org/10.1007/s12161-020-01948-4.

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16

LAWAL, Abubakar, and Kah LOW. "Residual Determination of Multiple Pesticides in Vegetable Samples by LC-MS/MS Coupled with Modified QuEChERS-dSPE Ionic Liquid-Based DLLME Method." Journal of the Turkish Chemical Society Section A: Chemistry, May 22, 2021, 693–704. http://dx.doi.org/10.18596/jotcsa.845578.

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17

Zhao, Qin, Yi-Lian Zhou, Shi-Wen Yue, Yu-Jiao Lou, and Yu-Qi Feng. "Combination of Modified QuEChERS and Disposable Polyethylene Pipet Assisted DLLME Based on Low Density Solvent Extraction for Rapid and Sensitive Determination of Fipronil and Its Metabolites in Eggs by GC-MS." Food Analytical Methods, January 8, 2021. http://dx.doi.org/10.1007/s12161-020-01948-4.

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