Unintended compositional changes in transgenic rice seeds ( Oryza sativa L.) studied by spectral and chromatographic analysis coupled with chemometrics methods.

Unintended compositional changes in transgenic rice seeds were studied by near-infrared reflectance, GC-MS, HPLC, and ICP-AES coupled with chemometrics strategies. Three kinds of transgenic rice with resistance to fungal diseases or insect pests were comparatively studied with the nontransgenic counterparts in terms of key nutrients such as protein, amino acids, fatty acids, vitamins, elements, and antinutrient phytic acid recommended by the Organization for Economic Co-operation and Development (OECD). The compositional profiles were discriminated by chemometrics methods, and the discriminatory compounds were protein, three amino acids, two fatty acids, two vitamins, and several elements.

Study of the alarming volatile characteristics of Tessaratoma papillosa using SPME-GC-MS.

The stinkbug's volatile compositions would alter very much before and after stinkbugs were disturbed or irritated, which caused the alarming effect. An efficient headspace solid-phase microextraction sampling method was established to study the alarming volatile characteristics and potential alarming volatiles of stinkbugs (Tessaratoma papillosa) followed by gas chromatography-mass spectrometry detection. The number of volatiles identified was 16 and 22 before and after stinkbug irritation, respectively.

A GC-MS study of the volatile organic composition of straw and oyster mushrooms during maturity and its relation to antioxidant activity.

Mushrooms are very popular in the market for their nutritional and medicinal use. Mushroom volatiles are not only an important factor in the flavor, but also contain many antioxidant compounds. Antioxidant activity is a very important property for disease prevention.

[Determination of organophosphorus pesticides in vegetables by microwave-assisted extraction/gas chromatography-mass spectrometry].

A method of microwave-assisted extraction (MAE) followed by gas chromatography-mass spectrometry (GC-MS) for the determination of organophosphorus pesticides (OPPs) in vegetables has been developed. The OPPs studied were diazinon, parathion and isocarbophos. Several extraction solvents were compared on the MAE efficiency.

The study of fingerprint characteristics of the emanations from human arm skin using the original sampling system by SPME-GC/MS.

An efficient and noninvasive method consisting of an original sampling device, solid phase microextraction (SPME) and gas chromatography-mass spectrometry (GC-MS) was developed to analyze volatile organic emanations from the skin of human arms. The emanations were sampled by SPME connected with the active sampling device for 30 min and transferred into GC-MS immediately for the consequent analysis. The sampling projects for 15 candidates were scheduled in both winter and spring with the same optimized conditions.