It can be recovered from the shell of shrimp and crab. But the raw material is not stable ,which affect chitosan’s yield and quality.
其制备通常是从虾、蟹壳提取的,但由于原料的不稳定性,使壳聚糖的产量和质量受到影响。
参考来源 - 从菌丝体中提取壳聚糖的研究进展·2,447,543篇论文数据，部分数据来源于NoteExpress
二战后，日本恢复了丝绸生产，生丝的产量和质量都得到了提高。
After the Second World War, Japan's silk production was restored, with improved production and quality of raw silk.
带领改善产品的生产量和质量。
栽培技术对烟叶的产量和质量起到决定性的影响。
Cultural technology significantly affects the yield and quality of tobacco leaf.
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