制备鲐鱼鱼肉发酵液中抗氧化因子的条件优化

以食品级枯草芽孢杆菌为实验用菌，通过发酵法制备具有抗氧化作用的鲐鱼鱼肉发酵液。在液体培养基的基础上研究装液量、葡萄糖添加量、鱼肉培养基料液比、培养转速对发酵产物的影响，结果表明：装液量50mL/250mL或100mL/250mL、葡萄糖添加量2%、鱼肉:水料液比(m/V)1:(1～2)、摇床转速150r/min条件下，发酵液的抗氧化性较高。在加糖量、装液量及料液比对试验结果影响较大的单因素试验基础上，采用响应面分析法(Box-Behnken)对发酵鱼肉培养基制备抗氧化型发酵液的工艺参数进行优化后，得出最佳条件为：葡萄糖添加量3.98%、装液量96.02mL/250mL、鱼肉:水料液比1:1.60，其发酵液的DPPH自由基清除率可达 94.52%。

Optimization of Fermentation Conditions for Preparation of Highly Antixodant Fermmented Mackerel Broth

The preparation of fermented fish broth with high antioxidant activity from macheral meat with food-grade Bacillus subtilis was investigated in the present study. The results of one-factor-at-a-time experiments showed that highly antioxidant fermented fish broth was obtained under the fermentation conditions: medium volume of 50 mL or 100 mL in 250 mL shake flasks, glucose concentration of 2%, fish meat-to-water ratio of 1:(1－2 )(m/V), and rotation speed of 150 r/min. It was also found that glucose concentraiton, medium volume in 250 mL shake flasks and fish meat-to-water ratio were main parameters that influence the production of antioxidant ingredients. Using response surface methdology based on a Box-Behnken experimental design, the main fermentation parameters were optimized to be 3.98%, 96.02 mL/250 mL and 1:1.60(m/V), respectively. The fermented fish broth obtained under these conditions exhibited a DPPH radical scavenging rate of 94.52%.