A headspace solid-phase microextraction gas chromatography-mass spectrometry (SPME GC-MS) method is described, to screen seafood for volatile organic compounds (VOCs) associated with petrochemical taint. VOCs are extracted from the headspace of heated sample homogenates by adsorption onto a SPME fiber and desorbed for analysis by GC-MS. Targeted compounds are determined semi-quantitatively usin...

Using an automated rapid headspace solid phase microextraction (SPME) method for volatile extraction in cantaloupes, 86 compounds already reported for muskmelons were recovered and an additional 53 compounds not previously reported were identified or tentatively identified. The SPME method extracted a copious number of volatiles that can be analyzed to clearly differentiate between variety, gro...

Two methods for the extraction, identification and quantification of the highest occurrence and lowest perception threshold off-flavours in fifteen different samples of Brazilian Pilsner beers were developed. For this purpose, headspace solid phase microextraction in combination with a gas chromatography coupled to a mass spectrometric detection (HS-SPME-GC-MS) as well as headspace extraction i...

Headspace solid-phase microextraction has been applied to the analysis of volatile phenols in wine. Silica fibre coated with Carbowax-divinylbenzene was found to be more efficient at extracting these compounds than other fibres such as those coated with polydimethylsiloxane, polyacrylate, carboxen-polydimethylsiloxane, and polydimethylsiloxane-divinylbenzene. Different parameters such as extrac...

Canines continue to be one of the most frequently deployed tool in detection explosives, and particularly homemade explosives (HMEs), part, due ease training new HME materials as threats arise. The majority HMEs encountered contain ammonium nitrate (AN), previous research has measured release ammonia from AN, found that vapor concentration varies with form, purity, environment, but this is not ...

Aerial parts of Citrus aurantium L. were subjected to headspace (HS) and hydro-distillation (HD) techniques after drying, and then headspace volatiles and the essential oil were analyzed by GC/MS. Results of GC/MS analysis led to identification seventeen (99.8%) and sixteen (99.9%) constituents in samples extracted by HS methods in leaf and flower, respectively. (E)-β-ocimene (2.5%), Linalool (...

Xylopia aromatica (Lam.) Mart. (Annonaceae) is a typical species from the Brazilian cerrado that presents medicinal properties. The plant distinguished by its large white flowers which produce pleasant fragrance. X. characterized wide range of application. These characteristics have motivated us to investigate volatile organic compounds (VOCs) via in vivo and vitro protocols headspace solid-pha...

background and objectives: analytical methods for volatile organic compounds (vocs) in different samples need extraction of compounds, by applying hazardous solvents. solid phase micro-extraction (spme) is a solvent-free equilibrium extraction method, in which proper calibration can allow quantitative determinations of vocs at a very good sensitivity without the use of any organic solvent. vocs...

Norlin, E., 2005. Nitrogen Isotope Analysis of Ammonium and Glycine. Method Development for Aqueous Solutions and Soil Extracts. Doctor ́s dissertation. ISSN 1652-6880, ISBN 91-576-6983-X Stable isotope techniques can be used as a tool in nitrogen cycling studies of different ecosystems. The studies are based on measurement of the heavy (N)tolight (N) isotopic ratios of nitrogen in different bio...

Volatile fingerprinting by Headspace-Solid-Phase Microextraction followed Direct Injection Mass Spectrometry (HS-SPME DIMS) has been assessed for the first time as an alternative approach to gas chromatographic methods GC-MS) rapid classification of honey botanical origin. In order fully evaluate potential SPME authentication, samples from different sources (eucalyptus, citrus, acacia, rosemary...