A fast analytical method for the simultaneous determination of 9 mycotoxins, including alfatoxins （B1, B2, G1, and G2）, fumonisins （B1, B2 and B3）, zearalenone, and deoxynivalenol in corn using dispersive solid-ph...A fast analytical method for the simultaneous determination of 9 mycotoxins, including alfatoxins （B1, B2, G1, and G2）, fumonisins （B1, B2 and B3）, zearalenone, and deoxynivalenol in corn using dispersive solid-phase extraction method and ultra-performance liquid chromatography coupled to tandem quadrupole time-of-lfight mass spectrometry （UPLC-Q-TOF-MS） was developed and validated. Samples were extracted with acetonitrile-water （84：16, v：v, containing 1% acetic acid） using ultrasonic extraction. The extracts were puriifed with a dispersive SPE method using C18 as a cleaning agent. The ifnal clear extracts were dried by nitrogen blowing and subsequently redissolved in methanol-water （5：5, v：v）. The samples were then analyzed by UPLC-Q-TOF-MS with 0.1% formic acid in ammonium acetate-methanol as mobile phase. The mean recoveries were ranged from 68.0 to 120.0%, and the relative standard deviation （RSD） ranged from 0.18 to 6.29%. Limits of detections ranged from 0.05 to 50 μg kg？1, and limits of quantiifcation ranged from 0.1 to 200 μg kg？1, which were below the legal limits set by the European Union for the legislated mycotoxins. The developed method was applied to 130 corn samples. Among the mycotoxins studied, alfatoxins B1 and fumonisins B1, B2 and B3 were the most predominant mycotoxins, and their concentrations were 0–593.12, 0–2.01×104, 0–6.94×103 and 0–3.05×103 μg kg–1, respectively.展开更多
黄曲霉毒素是一类化学结构类似的小分子化合物,均为二氢呋喃香豆素的衍生物,主要存在于土壤、动植物和各种坚果中,是霉菌毒素中毒性最大,对人类健康危害极为突出的一类霉菌毒素,而黄曲霉毒素的毒理机制始终不是很明确。计算机分子对接...黄曲霉毒素是一类化学结构类似的小分子化合物,均为二氢呋喃香豆素的衍生物,主要存在于土壤、动植物和各种坚果中,是霉菌毒素中毒性最大,对人类健康危害极为突出的一类霉菌毒素,而黄曲霉毒素的毒理机制始终不是很明确。计算机分子对接是模拟受体和底物之间通过能量匹配和几何匹配而相互识别的过程,其被广泛运用于虚拟筛选活性物质以及初步判断分子活性和毒性等领域,并对我们进行实体分子活性毒性试验起到了重要的指导作用。利用计算机分子对接软件Discovery Studio 3.1client,将6种常见黄曲霉毒素分子B1、B2、M1、M2、G1、G2与其具有强亲和性的蛋白进行虚拟对接实验,而这些蛋白在细胞凋亡、激素代谢、免疫抑制以及消化系统功能方面有重要的作用。通过本实验能够初步模拟黄曲霉毒素分子毒性作用位点,对于其毒理机制研究有重要的辅助作用。展开更多
基金supported by the Key Project of Science and Technology Development Program of Shandong Province,China(2013KF03)
文摘A fast analytical method for the simultaneous determination of 9 mycotoxins, including alfatoxins （B1, B2, G1, and G2）, fumonisins （B1, B2 and B3）, zearalenone, and deoxynivalenol in corn using dispersive solid-phase extraction method and ultra-performance liquid chromatography coupled to tandem quadrupole time-of-lfight mass spectrometry （UPLC-Q-TOF-MS） was developed and validated. Samples were extracted with acetonitrile-water （84：16, v：v, containing 1% acetic acid） using ultrasonic extraction. The extracts were puriifed with a dispersive SPE method using C18 as a cleaning agent. The ifnal clear extracts were dried by nitrogen blowing and subsequently redissolved in methanol-water （5：5, v：v）. The samples were then analyzed by UPLC-Q-TOF-MS with 0.1% formic acid in ammonium acetate-methanol as mobile phase. The mean recoveries were ranged from 68.0 to 120.0%, and the relative standard deviation （RSD） ranged from 0.18 to 6.29%. Limits of detections ranged from 0.05 to 50 μg kg？1, and limits of quantiifcation ranged from 0.1 to 200 μg kg？1, which were below the legal limits set by the European Union for the legislated mycotoxins. The developed method was applied to 130 corn samples. Among the mycotoxins studied, alfatoxins B1 and fumonisins B1, B2 and B3 were the most predominant mycotoxins, and their concentrations were 0–593.12, 0–2.01×104, 0–6.94×103 and 0–3.05×103 μg kg–1, respectively.
文摘黄曲霉毒素是一类化学结构类似的小分子化合物,均为二氢呋喃香豆素的衍生物,主要存在于土壤、动植物和各种坚果中,是霉菌毒素中毒性最大,对人类健康危害极为突出的一类霉菌毒素,而黄曲霉毒素的毒理机制始终不是很明确。计算机分子对接是模拟受体和底物之间通过能量匹配和几何匹配而相互识别的过程,其被广泛运用于虚拟筛选活性物质以及初步判断分子活性和毒性等领域,并对我们进行实体分子活性毒性试验起到了重要的指导作用。利用计算机分子对接软件Discovery Studio 3.1client,将6种常见黄曲霉毒素分子B1、B2、M1、M2、G1、G2与其具有强亲和性的蛋白进行虚拟对接实验,而这些蛋白在细胞凋亡、激素代谢、免疫抑制以及消化系统功能方面有重要的作用。通过本实验能够初步模拟黄曲霉毒素分子毒性作用位点,对于其毒理机制研究有重要的辅助作用。
