研究了黑曲霉Aspergillus niger ZJUT712菌株固态发酵和水煮工艺相耦合炮制牛蒡子. 结果表明,该工艺提高了牛蒡子中有效成分牛蒡子苷元的含量,从而有利于促进牛蒡子摄入体内迅速起效. 最佳固态发酵炮制条件为: 0.5 g牛蒡子粉、 3 g麸皮、 2 g甘蔗渣、 0.3 g蛋白胨和10 ml Mandels营养液,固液比1∶3.6 g/ml, 初始pH 5.6, 30 ℃发酵 7 d. 牛蒡子苷元产率随底物初始浓度的增加而降低. A.niger ZJUT712转化0.174 mmol/L牛蒡子苷的产率可达93.0%. 7 d时间内A.niger ZJUT712水解牛蒡子苷的过程符合Monod方程,反应动力学常数为Vm=0.083 7 mmol/(L·d), Km=0.16 mmol/L.
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