Abstract: In order to develop effective deep-sea microbial pesticide against aflatoxin contamination, this study optimized the fermentation medium composition and fermentation conditions of a deep-sea Bacillus circulus, showing significant inhibition activity against aflatoxin synthesis by uniform design based on starch-casein medium. The optimum scheme was consisted of 7.675 g/L starch, 0.787 g/L casein, 2.257 g/L yeast extract, 57.91% seawater, 4.15 pH, 1.02% strain inoculation amount, 20.51℃ culture temperature, and 3.28 d culture time. Compared with the original scheme, the cost of fermentation medium was reduced by 42.76%, fermentation temperature was reduced from 28℃ to 20.51℃, and culturing time was reduced from 6 d to 3.28 d. The optimized scheme established in this study had obvious practicability and maneuverability.

Key words: Bacillus circulus, fermentation optimization, aflatoxin

摘要： 为了开发有效防控黄曲霉毒素污染的深海微生物农药，以淀粉酪蛋白培养基为基础，利用均匀设计，对一株能显著抑制黄曲霉毒素合成的深海环状芽孢杆菌活性物质的发酵培养基成分和发酵条件进行了优化。获得的优化方案为7.675 g/L淀粉、0.787 g/L酪蛋白、2.257 g/L酵母膏、57.91%海水用量，pH 4.15，1.02%的菌种接种量，培养温度20.51℃、培养时间3.28 d。与原始方案相比，优化方案的发酵培养基成本降低了42.76%，发酵温度由原来的28℃降低为20.51℃，培养时间由6 d减少到3.28 d。该优化方案具有明显的实用性和可操作性。

关键词: 环状芽孢杆菌, 发酵优化, 黄曲霉毒素