Novel covalent organic frameworks based electrospun composite nanofiber membranes as pipette-tip strong anion exchange sorbent for determination of inorganic arsenic in rice.

Novel covalent organic frameworks (COFs) based PAN@TpBD(NH) electrospun composite nanofiber membranes (ECNMs) were fabricated as strong anion exchange sorbent by implementing electrospinning technology. The finished sorbent was characterized, and key parameters of pipette-tip solid phase extraction (PTSPE) procedures were investigated. Inorganic arsenic (iAs) was successfully separated from rice under the optimal precondition conditions, and quantified by hydride generation-atomic fluorescence spectrometry (HG-AFS).

Antifungal Activity and Action Mechanism of Ginger Oleoresin Against Isolated From Chinese Olive Fruits.

() is one of dominant pathogenic fungi causing rotten disease in harvested Chinese olive ( Lour.) fruits. The purposes of this study were to evaluate the antifungal activities of ginger oleoresin (GO) against and to illuminate the underlying action mechanisms.

Continuous Arsine Detection Using a Peltier-Effect Cryogenic Trap To Selectively Trap Methylated Arsines.

Hydride generation (HG) is an effective technique that eliminates interfering matrix species and enables hydride separation. Arsenic speciation analysis can be fulfilled by cryogenic trapping (CT) based on boiling points of resulting arsines using liquid nitrogen (LN) as a coolant. In this work, LN was replaced by the thermoelectric effect using a cryogenic trap that consisted of a polytetrafluoroethylene (PTFE) body sandwiched by two Peltier modules.

Speciation of As(III) and As(V) in fruit juices by dispersive liquid-liquid microextraction and hydride generation-atomic fluorescence spectrometry.

A sensitive method was developed to speciate and quantify As(III) and As(V) in fruit juices. At pH 3.0, As(III) and ammonium pyrrolidine dithiocarbamate (APDC) formed a complex, which was extracted into CCl4 by dispersive liquid-liquid microextraction (DLLME) and subsequently quantified by hydride generation-atomic fluorescence spectrometry (HG-AFS).

SPE speciation of inorganic arsenic in rice followed by hydride-generation atomic fluorescence spectrometric quantification.

Due to high toxicity, inorganic arsenic (iAs) species are the focus of monitoring effort worldwide. In this work arsenic was first extracted from rice by microwave-assisted digestion in HNO3-H2O2, during which As(III) was oxidized to As(V). Silica-based strong anion exchange cartridges were used to separate As(V) from organic forms.

Characterisation of the spoilage bacterial microbiota in oyster gills during storage at different temperatures.

Background: The spoilage bacterial community in oyster gill was investigated during storage at 4, 10 and 20 °C. Aerobic plate counts and pH values were determined. Total bacterial DNA was extracted from oyster gill and bulk cells of plate count media.