Most of the excessive aflatoxins in peanut oil are present at lower levels, and few photocatalysts have been reported for degrading low concentrations of aflatoxin B1 (AFB1). This study employed aptamer-modified magnetic graphene oxide/titanium dioxide (MGO/TiO2-aptamer) photocatalysts to degrade low concentrations of AFB1 in peanut oil, thoroughly investigating their selective efficiency, degradation mechanism, and product toxicity. The results indicated that the modification of aptamers on the surface of photocatalytic materials can enhance the selectivity of photocatalysts for AFB1 in peanut oil. Furthermore, UPLC-Q-Orbitrap mass spectrometry identified three degradation products, and structure properties and degradation mechanism of the composites were explored using density function theory (DFT) calculations analysis. The Ames test and zebrafish experiments confirmed that the degradation products had markedly reduced toxicity. This study offers a novel approach to mycotoxin degradation in food, crucial for reducing human exposure and ensuring food safety.

中文翻译：

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适配体改性TiO2复合光催化材料降解食用油中AFB1的选择性效率、降解机理及毒性


花生油中大多数过量的黄曲霉毒素含量较低，很少有光催化剂可以降解低浓度的黄曲霉毒素 B1 （AFB1）。本研究采用适配体改性磁性氧化石墨烯/二氧化钛 （MGO/TiO2-aptamer） 光催化剂降解花生油中低浓度的 AFB1，深入研究其选择性效率、降解机制和产品毒性。结果表明，光催化材料表面适配子的改性可以提高光催化剂对花生油中 AFB1 的选择性。此外，UPLC-Q-Orbitrap质谱鉴定了三种降解产物，并使用密度函数理论（DFT）计算分析探讨了复合材料的结构特性和降解机理。Ames 测试和斑马鱼实验证实，降解产物的毒性显著降低。本研究提供了一种降解食品中霉菌毒素的新方法，对于减少人类接触和确保食品安全至关重要。