An on-line solid-phase extraction disc packed with a phytic acid induced 3D graphene-based foam for the sensitive HPLC-PDA determination of bisphenol A migration in disposable syringes.

In this study, an on-line SPE-disc filled with phytic acid induced 3D graphene-based foam (PAGF) has been applied to the determination of the migration of bisphenol A (BPA) in disposable syringes. The approach is of quick, easy, sensitive and environmentally-friendly. Experimental conditions were investigated and optimized including the character of enriched material and the amount of migrated BPA under different temperature, time and pH conditions.

Headspace solid-phase microextraction coupled to gas chromatography for the analysis of aldehydes in edible oils.

Oxidation has important effects on the quality of edible oils. In particular, the generation of aldehydes produced by the oxidation of oils is one of the deteriorative factors to their quality. The aim of this study was to develop a method to determine the aldehydes as lipid oxidation markers in edible oils.

[Applications of multi-micro-volume pressure-assisted derivatization reaction device for analysis of polar heterocyclic aromatic amines by gas chromatography-mass spectrometry].

A multi-micro-volume pressure-assisted derivatization reaction device has been designed and made for the silylation derivatization of polar heterocyclic aromatic amines by N-(tert-butyldimethylsilyl )-N-methyl-trifluoroacetamide (MTBSTFA) with 1% catalyst tert-butyldimethylchlorosilane (TBDMCS) at a high temperature. The tert-butyldimethylsilyl derivatives then could be automatically analyzed by gas chromatography-mass spectrometry. Using the pressure-assisted device, the silylation reaction may occur at a temperature higher than the boiling points of the reagents, and several micro-volume samples can be simultaneously pretreated in the same device to shorten the sample-preparation time and to improve the repeatability.