Results 71 to 80 of about 24,605 (215)

Determinação de cádmio, chumbo e cobalto em matrizes aquosas usando micro extração líquido-líquido-sólido com detecção por SS-GF AAS [PDF]

, 2013
Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas, Programa de Pós-Graduação em Química, Florianópolis, 2013.Neste trabalho foram desenvolvidas diversas metodologias de microextração utilizando membranas ...
Carletto, Jeferson Schneider
core  

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

Green and Rapid Determination of Phthalates in Mineral Water From Virgin and Recycled PET Bottles

Journal of Mass Spectrometry, Volume 61, Issue 8, August 2026.
ABSTRACT This study investigates the presence and quantification of phthalates released into mineral waters from virgin and recycled polyethylene terephthalate (PET) bottles. A green, solvent‐free analytical method based on solid‐phase microextraction (SPME) coupled with gas chromatography–mass spectrometry (GC/MS) was developed and validated to detect
Claudia Lino, Serena Indelicato, David Bongiorno, Fabio D'Agostino, Giuseppe Avellone   +4 more
wiley   +1 more source

Recent Advances in Dispersive Liquid-Liquid Microextraction for Organic Compounds Analysis in Environmental Water: A Review [PDF]

, 2012
Dispersive liquid-liquid microextraction (DLLME) is a novel microextraction technique with a great potential in sample pretreatment, which has been increasingly used for preconcentration of diverse analytes.
Chen, Lingxin, Ma, Jiping, Lu, Wenhui
core  

Evaluating Stabilizers Effects on Aroma Release Dynamics in Ice Cream: A PTR‐ToF‐MS Analysis

Journal of Mass Spectrometry, Volume 61, Issue 8, August 2026.
ABSTRACT Capturing the dynamic volatilome of frozen matrices during phase transitions remains an analytical challenge, typically requiring invasive sampling. This study employs proton transfer reaction time‐of‐flight mass spectrometry (PTR‐ToF‐MS) as a rapid, noninvasive technique that directly samples headspace volatiles without preconcentration to ...
Camila Cossettin Teixeira, Michele Pedrotti, Lorenzo Gennari, Andrea Cavallero, Flavia Gasperi, Iuliia Khomenko, Franco Biasioli   +6 more
wiley   +1 more source

Liquid phase microextraction techniques combined with chromatography analysis: a review

Acta Chromatographica, 2020
Sample pretreatment is the first and the most important step of an analytical procedure. In routine analysis, liquid–liquid microextraction (LLE) is the most widely used sample pre-treatment technique, whose goal is to isolate the target analytes, provide enrichment, with cleanup to lower the chemical noise, and enhance the signal. The use of extensive
Dugheri, Stefano, Mucci, Nicola, Bonari, Alessandro, Marrubini, Giorgio, Cappelli, Giovanni, Ubiali, Daniela, Campagna, Marcello, Montalti, Manfredi, Arcangeli, Giulio   +8 more
openaire   +4 more sources

Alternativas verdes para o preparo de amostra e determinação de poluentes fenólicos em água Green alternatives for sample preparation and determination of phenolic pollutants in water

Química Nova, 2010
The restricted availability of water sources suitable for consumption and high costs for obtaining potable water has caused an increase of the conscience concerning the use.
Guilherme Dias Rodrigues, Luis Henrique Mendes da Silva, Maria do Carmo Hespanhol da Silva   +2 more
doaj   +1 more source

Aboveground and Belowground Insect Herbivory Changes Maize‐Wireworm Interactions via Root Volatile Cues

Plant, Cell &Environment, Volume 49, Issue 8, Page 5689-5702, August 2026.
ABSTRACT The rhizosphere harbours critical plant‐herbivore interactions often mediated by small lipophilic molecules (SLMs). Despite the agricultural importance of many soil‐dwelling insects, surprisingly little is known about chemically mediated belowground crop‐pest interactions. Root and shoot herbivores can influence these interactions by modifying
Diego M. Magalhães, Gareth A. Thomas, Oliver Clark‐Hattingh, Anusha Mohan‐Kumar, Pradip Songara, John C. Caulfield, David M. Withall, Michael A. Birkett, József Vuts   +8 more
wiley   +1 more source

Volatile flavor components in strong-flavor Baijiu detected by different pretreatment methods combined with GC-MS [PDF]

Zhongguo niangzao
The volatile flavor compounds in strong-flavor (Nongxiangxing) Baijiu were detected and analyzed by four pretreatment methods including solid phase extraction (SPE), liquid-liquid microextraction (LLME), headspace-solid phase microextraction (HS-SPME ...
FENG Ziyun, YANG Kangzhuo, HE Zhanglan, WANG Jianli, ZHENG Jia
doaj   +1 more source