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Yang J.,China National Center for Food Safety Risk Assessment
Wei sheng yan jiu = Journal of hygiene research | Year: 2013

To develop a method for determining 3 kinds of antioxidants in food in same time with HPLC and GC. Firstly, extracted fat with petroleum ether, then extracted antioxidants with 13 ml methnol, centrifuged, repeated the above procedure twice, combined the extracts, next evaporated to 5 ml, constanted volume to 10 ml, then kepted in freezer (- 1h), lastly, the supernatant injected into high performance liquid chromatography (HPLC) and Gas chromatography (GC) which had been optimized condition. The limits of quantitation for BHA,BHT and TBHQ were 0.002, 0.010 and 0.002g/kg respectively in HPLC, The limits of quantitation for BHA, BHT and TBHQ were 0.003, 0.002 and 0.005 g/kg respectively in GC, The mean recoveries at the two spiked levels were 82.8% - 109.0%. There were no significant difference between HPLC and GC. The method can be used to determine the antioxidants in food accurately and sensitively, the comparative results are constant between liquid and gas chromatography.

Liu X.,China National Center for Food Safety Risk Assessment
Journal of the Science of Food and Agriculture | Year: 2014

Food safety is a major livelihood issue and a priority concern in China. Since the Food Safety Law of the People's Republic of China was issued in 2009, the food safety control system has been strengthened through, inter alia, the Food Safety Risk Surveillance System, the Food Safety Risk Assessment System and the Food Safety Standards System. In accordance with the Food Safety Law and regulations for implementation, the Ministry of Health released the 'Twelfth Five-year Plan' of Food Safety Standards. The existing 5000 food-related standards will be integrated. Notwithstanding, the supervision system in China needs to be further improved and strengthened. © 2014 Society of Chemical Industry.

Liu G.,CAS Research Center for Eco Environmental Sciences | Zheng M.,CAS Research Center for Eco Environmental Sciences | Jiang G.,CAS Research Center for Eco Environmental Sciences | Cai Z.,Hong Kong Baptist University | Wu Y.,China National Center for Food Safety Risk Assessment
TrAC - Trends in Analytical Chemistry | Year: 2013

The main objective of the Stockholm Convention on Persistent Organic Pollutants (POPs) is to protect human health and the environment from overexposure to POPs. As one of the signatories to the Stockholm Convention, China has built significant capacity and carried out intensive studies on sources of emissions, levels of environmental pollution, and risk assessment associated with dioxins in recent years. Significant progress has been made in adopting and ratifying the Stockholm Convention.This article provides a brief overview of recent progress in capacity building for dioxin analysis, source identification and quantification of dioxin emissions, environmental monitoring of dioxin contamination, and risk assessment of human exposure to dioxins in China. © 2013 Elsevier Ltd.

Jiang W.,China Agricultural University | Wang Z.,China Agricultural University | Beier R.C.,U.S. Department of Agriculture | Jiang H.,China Agricultural University | And 2 more authors.
Analytical Chemistry | Year: 2013

Enzyme-linked immunosorbent assays (ELISAs) usually focus on the detection of a single analyte or a single group of analytes, e.g., fluoroquinolones or sulfonamides. However, it is often necessary to simultaneously monitor two classes of antimicrobial residues in different food matrixes. In this paper, we describe a dual-colorimetric ELISA for the simultaneous detection of 13 fluoroquinolone and 22 sulfonamide residues. The limit of detection for fluoroquinolones and sulfonamides was 2.4 and 5.8 ng/mL, respectively. The developed immunoassay is suitable for high-throughput screening of these low-molecular weight contaminants. This is the first report where two different enzymes (alkaline phosphatase and horseradish peroxidase) were used in one immunoassay and together in a single well for simultaneous detection of multiple low-molecular weight chemical residues. © 2013 American Chemical Society.

Wu Y.,China National Center for Food Safety Risk Assessment | Zhang Y.,Zhejiang University
Food and Chemical Toxicology | Year: 2013

This review summarizes the most recent scientific literature and regulations regarding analytical chemistry, toxicology, epidemiology, exposure, and risk assessment of melamine in infant formula. For analyses, enzyme-linked immunosorbent assay, high-performance liquid chromatography, capillary electrophoresis, gas chromatography coupled with mass spectrometry and liquid chromatography coupled with tandem mass spectrometry have commonly been used. Organization of proficiency test programs provided good evidence to facilitate granting laboratories accreditation and to ascertain the measurement reliability of melamine methods. Metabolic studies demonstrated that melamine is predominantly restricted to blood or extracellular fluid and is not extensively distributed to organs and tissues. Studies of human renal histopathology and clinical diagnoses indicated that melamine-related obstructive nephropathy derives from melamine precipitation in the lower urinary tract, with stones that are thought to be melamine-uric acid complexes. Epidemiologic studies showed that the occurrence of melamine-related urolithiasis is related to both the concentration of melamine in ingested milk products and the duration of ingestion. Long-term follow-up cohort studies should be continued to further investigate the epidemic and chronic hazard of melamine-induced nephrotoxicity. The World Health Organization set a tolerable daily intake of 0.2. mg/kg. bw/day to be applied to " the whole population including infants" Other authorities and research institutes have set/proposed lower values. © 2013 Elsevier Ltd.

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