磁性Fe基MOF材料(Fe3O4-MIL-101)对葡萄汁中赭曲霉毒素A的吸附性能及其品质的影响

    The adsorption of ochratoxin A in grape juice by Fe3O4-MIL-101 and its quality influences

    • 摘要: 赭曲霉毒素A(Ochratoxin A,OTA)的物理脱毒方法存在吸附材料效率低、选择性差等问题,难以满足实际需求。金属有机框架(Metal-Organic Frameworks, MOFs)材料因比表面积高、表面活性位点丰富而表现出更优的吸附性能。为了开发高效安全的脱毒方法,采用溶剂热法制备磁性Fe基MOF材料(Fe3O4-MIL-101),研究其对葡萄汁中OTA的吸附效果及葡萄汁品质的影响。结果表明:当前驱体H2BDC、Fe3O4和FeCl3·6H2O的物质的量的比为7∶1∶14时,材料的吸附效果最佳;最优条件下,当Fe3O4-MIL-101投加量为8 mg, OTA初始质量浓度为40 ng/mL时,25℃反应30 min, OTA吸附率达80.6%;3次循环试验后,该材料对OTA的吸附率仍在66%以上;Fe3O4-MIL-101吸附OTA后,葡萄汁中总酸、还原糖、维生素C及可溶性固形物含量均未发生显著性变化,吸光度和pH值略有下降。Fe3O4-MIL-101对葡萄汁中的OTA吸附率较高,虽然葡萄汁中的总酚和总黄酮含量有一定程度的损失,但营养品质整体保持较好。

       

      Abstract: The traditional physical detoxification method of ochratoxin A(OTA) has problems such as low efficiency and poor selectivity of adsorption materials, making it difficult to meet practical needs. Metal-Organic Frameworks(MOFs) materials exhibit better adsorption performance due to their high specific surface area and adjustable pore structure. In this study, Fe3O4-MIL-101 was prepared by loading a magnetic shell onto the MIL-101. The adsorption effect of Fe3O4-MIL-101 on OTA in grape juice and its effects on quality were studied. The results showed that when the molar ratio of the precursor H2BDC, Fe3O4 and FeCl3·6H2O was 7∶ 1∶ 14, the adsorption effect of the material was the best. Under the optimal conditions, when the dosage of Fe3O4-MIL-101 was 8 mg, the initial mass concentration of OTA was 40 ng/mL, and the degradation rate of OTA reached 80.6% after reacting for 30 min at 25 ℃. After three cyclic experiments, the adsorption rate of this material for OTA remained at 66%. There were no significant changes in the contents of total acid, reducing sugar, Vitamin C, and soluble solids in the grape juice, while the absorbance and pH value decreased slightly. Despite some loss of reducing sugars and polyphenols, the overall nutritional quality of grape juice was still well preserved.

       

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