辉光放电等离子体对葡萄汁中棒曲霉素的降解作用

Degradation of Patulin in Grape Juice by Glow Discharge Plasma

为了提高葡萄汁的安全品质,利用辉光放电等离子体(glow discharge plasma,GDP)反应器处理含棒曲霉素(patulin,PAT)的葡萄汁,并通过单因素试验和正交实验确定了最佳工艺条件:电压560 V、时间3 min、PAT初始浓度3 mg/L以及以100 mg/L H_2O_2为催化剂,在此条件下,GDP对葡萄汁中PAT的降解率高达98.9%。降解动力学测定结果表明GDP对葡萄汁中PAT的降解反应符合一级动力学特征。此外,葡萄汁经GDP处理后,对其各项理化指标进行评价,结果表明,GDP处理对葡萄汁的还原糖、可溶性固形物(total soluble solid,TSS)、总酸、pH、总酚及总黄酮均无显著影响,且可在一定程度上提高葡萄汁的澄清度。研究结果为辉光放电等离子体技术应用于葡萄汁中棒曲霉素的降解提供了理论依据。

In order to improve the security quality of grape juice, the grape juice containing patulin(PAT) was treated with a glow discharge plasma(GDP) reactor, and the optimal process conditions were determined by single factor experiment and orthogonal experiment: The voltage was 560 V, the treatment time was 3 min, the concentration of PAT was 3 mg/L, and 100 mg/L H2O2 was used as the catalyst. Under these conditions, the degradation rate of PAT in grape juice by GDP was as high as 98.9%. The results of degradation kinetics indicated that the degradation of PAT in grape juice by GDP conformed to the first-order kinetics. In addition, the physicochemical indexes of grape juice were evaluated after GDP treatment. The results showed that the reducing sugar, total soluble solid(TSS), total acid, pH, total phenols and total flavonoids of grape juice treated with GDP did not change significantly, and the clarity of grape juice was improved to a certain extent. Results of the research provided a theoretical basis for the application of glow discharge plasma to the degradation of patulin in grape juice.