摘要
以污水源分离菌株Bt BRC-WLY1为供试菌,以啤酒废弃物为培养基,单因素实验优化发酵条件,并探讨补麦芽糖、预处理后的新鲜啤酒酵母液(下称酵母液)和KH2PO4的不同补料成分和补料时间对发酵水平的影响。结果显示,优化的最佳发酵条件是初始pH7.5～8.0、装液量80 mL、发酵温度30℃、接种量5%。最佳补料方式为发酵8 h,加入10%的酵母液,与未补料对比,芽胞数、晶体干重、生产强度和单位糖产量分别提高了8、1.78、0.98、3.07倍。
Bt BRC-WLY1 isolated from wastewater-digestive plants was cultivated in brewery-waste-medium by submerged fermentation with the single factor study to optimize the fermentation conditions in the experiment and the affection of fermentation of Bt by different feeding modes and feeding composition of material, pretreatmented brewery yeast fluid （yeast fluid）, KH2PO4 and feeding time on fermentation were also explored . The results showed that the optimal conditions comprised initial pH at 7.5-8.0, 80 mL of liquid volume in the 500 mL flask, fermentation temperature at 30℃ and 5% of inoculation volume. The optimal fed batch mode was fedding 10% （V/V） of yeast fluid after cultured for 8 hr, which resulted in spores yield, crystal weightiness, production intensity and yield of units sugar increased 8, 1.78, 0.98 and 3.07 times than those of fermentation without fed batched.
出处
《热带作物学报》
CSCD
北大核心
2012年第5期930-935,共6页
Chinese Journal of Tropical Crops
基金
科技部农业科技成果转化资金(No.2010GB2C400212)
教育部博士点基金(No.20093515110010
No.20093515120010)
莆田市科技计划项目(No.2008N18)
福建省教育厅科技项目(No.JA11346)
福建省自然科学基金计划项目(No.2011J0101)
关键词
苏云金杆菌
补料
啤酒废弃物
发酵优化
Bacillus thuringiensis
Batch feed
Brewery waste
Fermentation-optimization
