Results 61 to 70 of about 5,024,272 (209)

DETERMINATION OF GEOSMIN AND 2-METHYLISOBORNEOL IN WATER BY HEADSPACE LIQUID-PHASE MICROEXTRACTION COUPLED WITH GAS CHROMATOGRAPHY-MASS SPECTROMETRY

, 2011
Geosmin (GSM) and 2-methylisoborneol (MIB) were extracted from water samples, adsorbed in organic solvent microdrop by headspace liquid-phase microextraction (HS-LPME), and were analyzed by gas chromatography-mass spectrometry (GC-MS).
Liu, Dongyan, Lingxin Chen, Wenhui Lu, Jiping Ma, Dongyan Liu, Chen, Lingxin, Li, Jinhua, Ma, Jiping, Song, Zhiwen, Lu, Wenhui, Jinhua Li, Zhiwen Song   +11 more
core   +1 more source

Hollow-Fibre-Supported Dispersive Liquid-Liquid Microextraction for Determination of Atrazine and Triclosan in Aqueous Samples

International Journal of Analytical Chemistry, 2017
We report the application of the dispersive liquid-liquid microextraction coupled to hollow-fibre membrane-assisted liquid-phase microextraction and its application for extraction of atrazine and triclosan. Under optimum conditions, namely, 25 μL of a 1 :
Thabiso Letseka, Mosotho J. George
doaj   +1 more source

Machine Learning–Based Optimization of Phthalate Extraction Conditions Using HS‐INME‐GC/MS Data

Journal of Chemometrics, Volume 40, Issue 10, October 2026.
ABSTRACT Optimization of extraction conditions in GC/MS analysis remains challenging because experimental variables can interact in complex and nonlinear ways. In this study, a machine learning based chemometric workflow was applied to optimize headspace in‐needle microextraction GC/MS (HS‐INME‐GC/MS) conditions for four phthalates: dimethyl phthalate (
Hyeyoung Jung, Sunyoung Bae, Jooyoung Kim   +2 more
wiley   +1 more source

Micro‐QuEChERS Extraction for Broad‐Spectrum LC‐QQQ‐MS Quantification of Nitazene Analogs in Plasma: A Validated Method With Casework Application

Drug Testing and Analysis, Volume 18, Issue 10, Page 1296-1310, October 2026.
Micro‐QuEChERS sample preparation coupled to LC‐QQQ‐MS enabled sensitive quantification of nitazene analogs in 100 μL of plasma. The validated method provided low detection limits and was successfully applied to an authentic intoxication case involving N‐pyrrolidino protonitazene, supporting clinical and forensic toxicology workflows.
Karla A. O. Souza, Náthaly C. B. F. Santos, Rafael Lanaro, Sara E. Walton, Alex J. Krotulski, Barry K. Logan, Mauricio Yonamine, Jose Luiz Costa   +7 more
wiley   +1 more source

Desenvolvimento de metodologias analíticas para determinação de fármacos em fluidos biológicos e amostras ambientais por cromatografia líquida e gasosa [PDF]

, 2007
Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas. Programa de Pós-Graduação em Química.Neste trabalho está apresentada a análise de fluído biológico e matriz ambiental para a determinação de fármacos ...
Suchara, Eliane Aparecida
core  

Effects of Different Drying Methods on the Physicochemical Properties and Flavor Profile of Chaenomeles speciosa (Sweet) Nakai

eFood, Volume 7, Issue 5, October 2026.
Comparative assessment of different drying methods on the physicochemical properties and flavor quality of Chaenomeles speciosa. Changes in soluble sugars, organic acids, phenolic compounds and volatiles in Chaenomeles speciosa following different drying treatments were determined.
Houyu Kang, Hong Quan, Qiaojun Cai, Xiaozhong Lan, Xinbo Guo   +4 more
wiley   +1 more source

Triazoles in the environment: An update on sample pretreatment and analysis methods

Ecotoxicology and Environmental Safety
Triazoles, due to their high bactericidal performance, have been widely used in the agricultural, clinical, and chemical industry. However, triazoles have been proven to cause endocrine-toxic and organ impairment in humans as a potentially toxic ...
Pei-chen Zou, Yuan Zhang, Yu Bian, Rong-zhu Du, Min Qian, Xue-song Feng, Cheng Du, Xin-yuan Zhang   +7 more
doaj   +1 more source

Sensitive Determination of Terazosin in Pharmaceutical Formulations and Biological Samples by Ionic-Liquid Microextraction Prior to Spectrofluorimetry

International Journal of Analytical Chemistry, 2012
An efficient and environmentally friendly sample preparation method based on the application of hydrophobic 1-Hexylpyridinium hexafluorophosphate [Hpy][PF6] ionic liquid (IL) as a microextraction solvent was proposed to preconcentrate terazosin.
Mohsen Zeeb, Mahdi Sadeghi
doaj   +1 more source

Comparison of Extraction Methods for the Quantification of Phytohormones From Tomato Fruits and Leaves by LC–MS/MS

Journal of Mass Spectrometry, Volume 61, Issue 10, October 2026.
ABSTRACT Purification of crude plant extracts by solid‐phase extraction (SPE) is assumed to reduce matrix effect in phytohormone quantification by LC–MS/MS, but its efficacy is rarely assessed. We used postextraction spiking of isotope‐labeled phytohormones to estimate matrix effect, recovery, and processes efficiency in extracts prepared according to ...
Carlos A. Juarez Guzman, Linxing Yao, Corey D. Broeckling, Cristiana T. Argueso   +3 more
wiley   +1 more source

Analysis of triazine herbicides using an up-and-down-shaker-assisted dispersive liquid-liquid microextraction coupled with gas chromatography-mass spectrometry

, 2017
In dispersive liquid-liquid microextraction, a few hundred microliters to a few milliliters of water-miscible dispersive solvent are commonly used to assist emulsification in aqueous samples.
Chen, Pai-Shan;Haung, Wan-Yun;Huang, Shang-Da, 陳珮珊   +1 more
core   +1 more source