纳米-氧化镁荷正电无机陶瓷膜的制备及对葡萄汁中赭曲霉毒素A的静电吸附

Synthesis of nano-MgO positively charged inorganic ceramic membrane and electrostatic adsorption for ochratoxin A in grape juice

赭曲霉毒素A(ochratoxin A,OTA)作为重要的真菌毒素之一,在葡萄制品中的污染较为普遍,尤其是葡萄酒与葡萄汁。传统的OTA物理脱除方法存在材料单一、吸附材料难去除、影响营养品质等问题。该研究采用浸渍-热分解法以尿素与MgCl_(2)·6H_(2)O为原料通过加入分散剂来制备纳米-氧化镁(nano-MgO)荷正电无机陶瓷膜,筛选了OTA的最佳吸附条件,应用于葡萄汁中OTA的去除并分析了葡萄汁的营养品质与风味变化。结果表明,nano-MgO立方体有效增加了陶瓷膜的比表面积,改变了其荷电性能,对葡萄汁中OTA的吸附率达到91%以上,且整体保留了葡萄汁的营养品质与香气物质。

Ochratoxin A(OTA)is an important mycotoxin that widely exists in grape products,especially in wine and grape juice.The traditional physical removal methods for OTA are limited by single material,difficult removal of adsorbents,and affecting the nutri-tional quality.Nano-MgO positively charged inorganic ceramic membrane was prepared by impregnation-thermal decomposition with urea,MgCl_(2)·6H_(2)O and dispersant,and the optimal conditions for OTA adsorption were tested.Nano-MgO positively charged inorganic ceramic membrane was applied to remove OTA in grape juice,and the quality and flavor changes of grape juice were also analyzed.The results showed that nano-MgO cubes increased specific surface area and changed the electric properties of the ceramic membrane.The removal rate of OTA in grape juice was over 91%,and the overall nutritional quality and aroma substances of grape juice was preserved.