食品科学 ›› 2012, Vol. 33 ›› Issue (12): 143-148.doi: 10.7506/spkx1002-6630-201212028

• 分析检测 • 上一篇    下一篇

黄曲霉毒素G1 与β - 环糊精及其衍生物超分子体系的荧光光谱研究

马 良1,2,张 敏1,张宇昊1,2,胡媛媛1,周 瑶1   

  1. 1.西南大学食品科学学院 2.重庆市特色食品工程技术研究中心
  • 出版日期:2012-06-25 发布日期:2012-07-27
  • 基金资助:
    国家“863”计划项目(2007AA10Z427);中央高校基本科研业务费专项(XDJK 2009C056); 西南大学研究生科技创新基金项目(ky2010006)

Fluorescence Enhancement Mechanism of Aflatoxin G1 by β-Cyclodextrin and Its Derivatives

MA Liang1,2,ZHANG Min1,ZHANG Yu-hao1,2,HU Yuan-yuan1,ZHOU Yao1   

  1. (1. College of Food Science, Southwest University, Chongqing 400716, China; 2. Engineering Technology Research Center for Characteristic Food of Chongqing, Chongqing 400716, China)
  • Online:2012-06-25 Published:2012-07-27

摘要: 研究β-环糊精及其衍生物对AFG1的超分子包合作用及反应体系荧光响应值的影响。经研究:AFG1-HE-β-CD二元包合物反应体系荧光响应值大幅提高,在溶剂为2%的甲醇溶液,HE-β-CD浓度0.05mol/L、反应时间3min时体系可以达到最大的荧光值。根据Benesi-Hildebrand法确定HE-β-CD与AFG1形成1:1包络物。紫外吸收光谱、荧光光谱、KI淬灭实验以及热力学参数表明,AFG1进入HE-β-CD空腔从而荧光得到保护。AFG1在2~40μg/kg范围内与体系荧光呈良好线性关系,相关系数为0.9998,检出限为0.079μg/kg。将HE-β-CD应用于花生样品AFG1分析,准确度和精密度良好。

关键词: β-环糊精, 黄曲霉毒素G1, 荧光增敏, 超分子包络物

Abstract: The fluorescence response signals of supramolecular inclusion complexes of AFG1 with β-cyclodextrin or its derivatives were studied. The fluorescence response signal of AFG1-HE-β-CD reaction system was significantly enhanced compared with AFG1, which reached maximum level after 3 min reation in 2% methanol solution HE-β-CD at the HE-β-CD cocnentration of 0.05 mol/L. According to the Benesi-Hidebrand equation, an inclusion complex was formed from AFG1 and HE-β-CD at a ratio of 1:1. UV spectroscopic, infrared spectroscopic and thermodynamic analyses and KI quenching experiments showed that AFG1 entered the cavity of HE-β-CD so that its fluorescence intensity was protected. An excellent linear relationship with fluorescence intensity was observed in the AFG1 concentration of 2-40 μg/kg (r = 0.9998). The detection limit was 0.079 μg/L. Therefore, the application of HE-β-CD can permit the accurate and precise analysis of AFG1 in peanut samples.

Key words: β-cyclodextrin, aflatoxin G1, fluorescence enhancement, supramolecular inclusion

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