Results 111 to 120 of about 24,237 (229)

Desenvolvimento de um método de MEFS com CG-DIC para determinação de 1,4 dioxana em amostras de cosméticos

open access: yesQuímica Nova, 2001
A headspace solid-phase microextraction (HS-SPME) for the determination of 1,4 dioxane in cosmetics by gas chromatography is described. A manual SPME holder with 85 µm polyacrylate coating is utilized.
Silva Fernando C.   +3 more
doaj  

Volatiles from Flower: Comparative analysis by Simultaneous Distillation-Extraction and Solid Phase Microextraction

open access: yesNatural Product Communications, 2012
The chemical composition of the volatile compounds isolated by simultaneous distillation-extraction (SDE) and headspace-solid phase microextraction (SPME) from flowers of Michelia champaca growing in Cuba was investigated by GC/FID and GC/MS. Sixty-seven
Disnelys Báez   +2 more
doaj   +1 more source

Impact of Ohmic Heating on Coconut Water Volatile Compounds [PDF]

open access: yes, 2012
Immature coconut water (CW) is a low acid fruit juice mainly composed of sugars and minerals. Beside its healthy feature, it can also be a pleasant refreshing drink especially when coming from aromatic coconut varieties.
Dornier, Manuel   +3 more
core  

The Use of Ultra-Fast Gas Chromatography for Fingerprinting-Based Classification of Zweigelt and Rondo Wines with Regard to Grape Variety and Type of Malolactic Fermentation Combined with Greenness and Practicality Assessment

open access: yesMolecules
In food authentication, it is important to compare different analytical procedures and select the best method. The aim of this study was to determine the fingerprints of Zweigelt and Rondo wines through headspace analysis using ultra-fast gas ...
Anna Stój   +4 more
doaj   +1 more source

The Application of Headspace: Solid-Phase Microextraction (HS-SPME) Coupled with Gas Chromatography/Mass Spectrometry (GC/MS) for the Characterization of Polymers [PDF]

open access: yes, 2017
Solid-Phase Microextraction (SPME) is a very simple and efficient, solventless sample preparation method, invented by Pawliszyn and coworkers at the University of Waterloo (Canada) in 1989.
Kusch, Peter (Dr.)
core  

Evaluation of equilibrium headspace concentration of orange beverage emulsion by using solid phase microextraction (SPME) during storage. [PDF]

open access: yes, 2010
In this study, the effect of glycerol (0.5, 1 and 1.5% w/w) and vegetable oil (2, 3 and 4% w/w) on the equilibrium headspace concentration of target volatile flavor compounds released from the orange beverage emulsions during storage was investigated by ...
Mirhosseini, Hamed   +2 more
core  

Determination of volatile fatty acids in municipal wastewater by gas chromatography-mass spectrometry preceded by headspace- solid phase microextraction with PDMS-CAR fibre [PDF]

open access: yes, 2010
An analytical procedure based on headspace – solid phase microextraction (HS-SPME) followed by gas chromatography-mass spectrometry (GC-MS) has been developed for the determination of free volatile fatty acids in municipal wastewater samples ...
Pokhrel, Teeka Ram
core  

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