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Zhang X.,China Agricultural University | Chen L.,China Agricultural University | Li J.,China Agricultural University | Zhu B.Q.,China Agricultural University | And 2 more authors.
European Food Research and Technology | Year: 2013

A total of 119 wines, including 115 dry wines (77 red, 34 white, 4 rosé) and 4 ice wines, were obtained from four major regions around China (east, northeast, west, and northwest) from 1999 to 2009. Ochratoxin A (OTA) was detected by solid-phase extraction and high-performance liquid chromatography with fluorescence detection. The OTA levels ranged from <0.1 to 5.65 μg/L. The wines from the northeast area had the highest OTA level, with an average concentration of 2.18 μg/L. Analysis of the correlation between meteorological parameters and the OTA concentration in red wine revealed that the OTA concentration was positively correlated with rainfall in August, but negatively correlated with the average temperature. No significant correlation was found with the daily range of temperature and relative humidity. The results show that climate factors affect the OTA distribution in wines from the four major regions of China. © 2012 Springer-Verlag Berlin Heidelberg. Source


Jin Q.,China Agricultural University | Yang J.,China Agricultural University | Ma L.,Supervision and Testing Center for Agricultural Products Quality | Cai J.,Guangdong Mulberry Wine Industry Co.Ltd | Li J.,China Agricultural University
Journal of Food Science | Year: 2015

Mulberry (genus Morus) is a significant source of polyphenols, which can promote positive effects on human health. China has various mulberry cultivars, however, many Chinese mulberry cultivars have been only minimally studied. To solve this lack of research, 8 mulberry cultivars (Da10, Tang10, Yueshen74, Yuefenshen, Longsang, Ningxia1hao, Taiwanguosang, and Baiyuwang) from 4 regions of China were assessed to determine their polyphenol profiles using HPLC-MS/MS and then tested for their antioxidant and anti-α-glucosidase activities in vitro. A total of 18 nonanthocyanins and 4 anthocyanins were quantified in mulberry cultivars; among these polyphenols, chlorogenic acid, quercetin 3-O-rutinoside, and cyanidin 3-O-glucoside were confirmed as the major phenolic acid, flavonol derivative, and anthocyanin, respectively. Two types of stilbene compounds, piceid, and piceatannol, were detected for the 1st time in all mulberry cultivars. Moreover, the methanolic extracts of different mulberry cultivars showed disparate antioxidant and α-glucosidase inhibitory activities, and this discrepancy was mainly attributed to varying the anthocyanin content. Based on our results, Taiwanguosang is proposed to be a good candidate suitable for further process due to its high level of anthocyanins. Practical Application: The polyphenols of mulberry cultivars are vital for human health and are relevant to the further development of mulberry-based products. China has a wide range of mulberry cultivar resources, and many of these cultivars have not yet been studied. Our research concentrated on the polyphenol profiles, antioxidant, and α-glucosidase inhibitory activities of various mulberry cultivars from different regions of China to provide basic information for mulberry cultivar selection and mulberry-based food production. © 2015 Institute of Food Technologists®. Source


Zhang X.,China Agricultural University | Li J.,China Agricultural University | Zong N.,JinMaiLang Beverage Corporation Company Ltd | Zhou Z.,Supervision and Testing Center for Agricultural Products Quality | And 2 more authors.
Food Additives and Contaminants: Part B Surveillance | Year: 2014

A total of 56 dried vine fruits, including 31 sultanas and 25 currants, were selected from Chinese markets in 2012. All samples were analysed for Ochratoxin A (OTA) using solid-phase extraction and high-performance liquid chromatography (HPLC) with fluorescence detection. It turned out that 58.9% of the samples were positive and the OTA amount ranged from <0.07 to 12.83 μg/kg, with a mean level of 0.99 μg/kg. Only one sample exceeded the European Union (EU) maximum level of 10 μg/kg. Meanwhile, it was shown that OTA contamination increased among north-western, northern and southern China, which showed OTA means of 0.08, 0.99 and 2.01 μg/kg, respectively. Moreover, in samples of products sold in sealed plastic bags, i.e. consumer-size packages (n = 19, mean = 0.30 μg/kg) less OTA was detected when compared with sampled bulk packages (n = 37, mean = 1.67 μg/kg). In addition, sultanas (mean = 0.92 μg/kg) had less OTA contamination than currants (mean = 1.22 μg/kg). © 2014 © 2014 Taylor & Francis. Source


Zhang X.,China Agricultural University | Xiao Z.,Beijing Agro Environmental Monitoring Station | Zhang H.,China Agricultural University | Zhang H.,Supervision and Testing Center for Agricultural Products Quality | And 3 more authors.
Chinese Journal of Chromatography (Se Pu) | Year: 2012

A high performance liquid chromatography-fluorescence detection with post-column derivatization method was developed to detect fumonisin B1 (FB1) and fumonisin B2 (FB2) in corn. Several factors, such as the pH of derivatization buffer, concentration and flow rate of derivatization reagents, excitation wavelength, emission wavelength, which affected the detection of fumonisins were optimized. The separation was performed on a ZORBAX SB C18 column operated at 40°C with the gradient elution by two mobile phases of 0.1mol/L sodium dihydrogen phosphate solution (pH 3.3) and methanol at a flow rate of 0.8mL/min. The derivatization was performed at ambient temperature. The o-phthalaldehyde (OPA) flow rate was 0.4mL/min. The results showed that the optimum conditions were pH 10.5 of the derivatization reagent, OPA concentration at 2g/L, and excitation wavelength of 335nm, emission wavelength of 440nm. The linear plots of FB1 and FB2 were obtained between 0.2to20mg/L, with the correlation coefficients above 0.999 for both FB1 and FB2. The limits of detection of fumonisins B1 and B2 were 0.02mg/kg. The mean recoveries at the three spiked levels of 0.1-4.0mg/kg were 82. 5%-89.8%. This method is accurate, simple, rapid and suitable for the determination of fumonisins B1 and B2 in corn. Source

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