A technique based on solid-phase microextraction, mass spectrometry, and multivariate analysis (SPME-MS-MVA) was used to predict the shelf life of pasteurized and homogenized reduced-fat milk and whole-fat chocolate milk sampled over a 7 month period. Using SPME-MS-MVA, which is essentially a mass spectrometry-based electronic-nose instrument, volatile bacterial metabolites were extracted from ...

Viola calcarata L. and dubyana Burnat ex Gremli belong to the V. complex in section Melanium (Violaceae family). For first time, essential oils (EOS) obtained by hydrodistillation from dried flowers, were analyzed GC/MS SPME-GC/MS describe their volatile chemical profile. Differences qualitative quantitative composition between two violets have been found. A total of 43 compounds identified amo...

The aim of this study was to compare two extraction procedures: dynamic headspace-purge and trap (PT) and headspace solid-phase microextraction (HS-SPME) for gas chromatographic determination of benzene, toluene, ethylbenzene, and isomeric xylenes (BTEX) in urine with photoionization (PID) and mass spectrometric (MS) detection, respectively. Both methods showed linearity in the range of interes...

Kelussia odoratissima Mozaff. is a species of Apiaceae endemic to the Zagros Mountains in Iran. In present investigation, for first time, polyphenolic compounds and flavonoids its leaves were determined by liquid chromatography-mass spectrometry (LC-MS). As result, p-coumaric acid, ferulic caffeic chlorogenic acetyl phloroglucinol, vanillic m-coumaric 4-methylsiringol as main phenolic compounds...

Thymus L. is of great interest in horticulture as ornamentals, spices, and medicinal plants, well the extracts industry due to richness bioactive specialized metabolites. The natural hybrid T. × josephi-angeli Mansanet & Aguil. produced Spain, its horticultural forms are very popular for domestic uses gardening. However, micropropagation chemical composition have not been studied yet. There...

Various solvents can be used in the synthesis of the illicit synthetic drug methylenedioxymethamphetamine (MDMA, commonly known as Ecstasy). In the crystallization process, traces of those solvents can be trapped inside crystals; during the following tabletting process, the solvent traces remain present in the tablets. The forensic investigation of tablets for solvents may increase knowledge of...

The purpose of the present study was to identify, by gas chromatography (GC) and GC-mass spectrometry (GC-MS), components spontaneously emitted volatile organic compounds (VOCs), obtained Solid-Phase-Micro-Extraction (SPME) that hydrodistilled oil fresh flowers leaves Ononis natrix, as well compare them. leaf rich in non-terpenoid aldehydes, whereas its aroma profile contained mainly sesquiterp...

A novel rapid, simple and solvent-free method was developed for determination of the volatile compounds from the flowers of Chimonanthus praecox Link using headspace solid-phase microextraction (HS-SPME) and gas chromatography-mass spectrometry (GC-MS). The SPME conditions were firstly optimized and applied to sampling of the volatile compounds emitted from living Chimonanthus praecox L. flower...

The characterization of the volatile compounds of two varieties of Solanum betaceum Cav. by means of headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography-mass spectrometry (GC-MS) is presented. The HS-SPME method for extraction of the volatiles compounds was optimized by using a 2 central composite design. Maximum extraction of volatile compounds was achieved by using...

Roots of Vetiveria zizanioides Nash (Mae Hae; Thai ecotype) planted in three different cultivation systems (normal soil, normal soil with added microbes and semi- hydroponically) were extracted using a simultaneous steam distillation and solvent extraction (SDE) apparatus. Yields of the essential oils obtained were 0.27, 0.18 and 0.06%, respectively. The separation profiles obtained by comprehe...