求翻译：Optimization of a process for extracting astaxanthin from Phaffia rhodozyma by acidic method was investigated, regarding several extraction factors such as acids, organic solvents, temperature and time. Fractional factorial design, central composite design and response surface methodology were used to derive a statistically optimal model, which Optimization of the extraction process in the traditional preparation of Baohe Wan].是什么意思？

待解决 悬赏分：1 - 离问题结束还有