Isolation and Identification of pathovar from Black Fungus and Characteristics of the Gene Cluster - Shanghai Municipality, China, 2023.

What Is Already Known About This Topic?: () pathovar (), a foodborne pathogen, can cause lethal poisoning. Most cases have been reported in China, primarily originating from fermented cereal products.

What Is Added By This Report?: This study investigated the prevalence of contamination in commercially available fungi and analyzed the environmental conditions for bongkrekic acid (BA) production in Shanghai.

[Research on pretreatment methods for cystine determination in milk powder].

Objective: To establish a rapid, accurate and safe pretreatment method for the determination of cystine in milk powder.

Methods: Samples were oxidized at 50 ℃ for 10 min after adding performic acid, and then the reaction was terminated with ethanol as oxidation terminator. The reaction solution was concentrate to dryness by vacuum centrifugation at 50 ℃.

Determination of polybrominated diphenyl ethers and polychlorinated biphenyls in fishery and aquaculture products using sequential solid phase extraction and large volume injection gas chromatography/tandem mass spectrometry.

A new method was developed to determine polybrominated diphenyl ethers (PBDEs) and polychlorinated biphenyls (PCBs) in fishery and aquaculture products. Samples were extracted by an accelerated solvent extraction system and cleaned up by sequential solid phase extraction (SPE) including dispersive SPE (D-SPE) and tandem SPE. PBDEs and PCBs were analyzed by a large-volume injection gas chromatography triple quadrupole mass spectrometry (LVI-GC-QqQ-MS/MS).

Simultaneous determination of 45 pesticides in fruit and vegetable using an improved QuEChERS method and on-line gel permeation chromatography-gas chromatography/mass spectrometer.

In this study, a method was developed to determine 45 selected pesticides (of different chemical families) in fruit and vegetable (including apple, spinach and cucumber). Samples were extracted using an improved QuEChERS method with salting out and phase separation in two steps. The target pesticides in concentrated extracts were analyzed by an on-line gel permeation chromatography-gas chromatography/mass spectrometer (online-GPC-GC/MS).