There are a lot of factors that affect the quality, such as protective agent, freezing temperature, freezing rate, freeze - drying conditions.
影响冻干角膜效果的因素涉及方方面面，诸如保护剂系统，预冻温度，降温速率，冷冻干燥条件等。
The optimal fermentation condition was found out, the growth improver and protective agent in freeze drying were decided in this study.
本研究确定了最佳发酵工艺，促生长物质及冻干保护剂。
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