【摘要】 为探讨金属离子对法夫酵母生物合成虾青素的影响,采用Plackett-Burman设计从八种金属离子中筛选出了对虾青素合成有显著影响的四种金属离子,即Zn2+、Cu2+、Mn2+、Fe3+。在此基础上采用最陡爬坡实验逼近最优区域,Box-Behnken设计对其浓度进行优化,结果表明:最佳离子浓度分别为1.45、1.94、1.3、0.89μmol/L,虾青素产量达6.89mg/L,较优化前提高了51%左右。更多还原

【Abstract】 The effects of metal ions on astaxanthin accumulation of Phaffia rhodozyma were investigated in the paper. Three types of experimental designs were used to optimize the metal ions conditions for astaxanthin production. The first Plackett- Burman experiment design was adopted to screen key factors from eight ions. The results indicated that Zn2+, Cu2+, Mn2+ and Fe3+ contribute to synthesize astaxanthin greatly. With this first design the most important factors were determined to be used in the second experimental strategy. The method of steepest ascent was applied in order to rapidly approach the optimum. Finally, the optimal concentrations of Zn2+, Cu2+, Mn2+ and Fe3+ are 1.45μmol/L, 1.94μmol/L, 1.3μmol/L and 0.89μmol/L respectively, optimized through Box-Behnken design and RSM. In optimum conditions, the yield of astaxanthin is about 6.89 mg/L, 51% higher than the production under the initial conditions.更多还原