The aim of the study is to determine essential oil profile and antioxidant activity endemic Marrubium parviflorum subsp. oligodon. contents were analyzed by Gas Chromatography-Mass Spectrometry (GC-MS) using Solid Phase Microextraction (SPME). In addition, total phenolic content capacity measured DPPH• FRAP assays determined. Twenty-three (64.12%) components Pentadecanolide was found be major p...

In the present work, emission of volatile organic compounds (VOCs) from plastic packaging materials and their migration to packaged product was investigated. Fresh-cut artichokes were chosen as a case study owing nutritional profile, including phenolic compounds, antioxidants, inulin fiber, high market demand. Artichokes cut into quarters, in active modified atmosphere (5% O 2 10% CO ) three di...

Solid-phase microextraction (SPME) combined with gas chromatography (GC) is optimized and applied to the analysis of street-cocaine samples followed by the field-testing of isolated chemicals using certified detector dogs. SPME proves to be a very sensitive and rapid method for isolating odor chemicals from street-cocaine samples. SPME-GC and activated charcoal strip (ACS)-SPME-GC signature pro...

The coffee fermentation process has been established as a determining stage regarding its quality and aroma. objective of this study was to evaluate the differences that exist between five processes within each (at different times) based on their volatile sensory profile. evaluated were dry or natural (NA), semi-dry honey (HO), three variations wet process, called: conventional aerobic (AC), wi...

Green algae are of great economic importance. Seaweed is consumed fresh or as seasoning in Japan. The commercial value is determined by quality, color, and flavor and is also strongly influenced by the production area. Our research, based on solid phase microextraction gas chromatography mass spectrometry (SPME-GC-MS), has revealed that volatile compounds differ intensely in the four varieties ...

BACKGROUND Cocaethylene (CE) is a cocaine metabolite formed during alcohol and cocaine co-consumption. There are no previous studies to assess the effectiveness of hair CE as a biomarker indicating chronic alcohol consumption among individuals who have consumed cocaine. OBJECTIVES To establish the ability of CE to predict chronic alcohol use among individuals testing positive for cocaine. M...

This study develops a method for the discrimination and prediction of honey samples from various botanical origins. The method was based on the nontargeted volatile profiles obtained by solid-phase microextraction and gas chromatography-mass spectrometry (SPME-GC/MS) combined with chemometrics. The blind analysis of nontargeted volatile profiles was carried out by SPME-GC/MS for 87 authentic ho...

The sampling techniques headspace solid-phase microextraction (HS-SPME), petrol ether extraction (PEE) and steam distillation extraction (SDE) were compared for the GC-MS of volatile constituents present in ginger (Zingiber officinale). The effects of different parameters, such as extraction fibers, extraction time, extraction temperature and particle size ranges, on the HSSPME of rhizome of gi...