三七渣发酵生产蛋白饲料的总糖和淀粉降解动力学

Dynamics of Total Sugar and Starch Degradation in Protein Feed Fermentation Production Using Panax Notoginseng Residues

摘要:

在黑曲霉/产朊假丝酵母固态发酵三七渣生产蛋白饲料过程中，考察了总糖含量、淀粉含量、还原糖含量、产品收率和pH值随时间的变化，并建立了总糖和淀粉降解动力学模型。研究结果表明，总糖和淀粉的降解动力学适合采用四参数对数模型进行描述，该模型能准确预测发酵过程中总糖和淀粉含量的变化情况。在发酵过程中总糖和淀粉的半衰期分别为58.32h和42.47h，其降解速率分别在发酵后46.1h和29.1h到达峰值。总糖和淀粉在快速降解阶段的平均降解速率是其慢速降解阶段的平均降解速率的2倍以上。在快速降解阶段，淀粉的平均降解速率大于总糖的平均降解速率，但在慢速降解阶段则相反。

关键词:三七;发酵;蛋白饲料;降解动力学

Abstract:

The total sugar, starch and reducing sugar, yield and pH value change were thoroughly studied in solid state fermentation for protein feed production from Panax notoginseng residues. The related degradation kinetic model of total sugar and starch was established as well. The results showed a four-parameter model matched well the degradation kinetics of total sugar and starch and predicted the change of total sugar and starch contents relatively accurately. The half-life of total sugar and starch were determined as 58.32h and 42.47h, respectively. The peaks of degradation rate were observed at 46.1h and 29.1h, respectively. The average degradation rates of both total sugar and starch in the fast degradation stage were twice more than those in the slow degradation stage. It was found that the average degradation rate of starch was greater than that of total sugar in the fast degradation stage, but oppositely less in the slow degradation stage.

Key words:Panax notoginseng;Fermentation;Protein feed;Degradation dynamics