| 1. | Chitin possesses special character and usage after modification such as modified as sulphonation , carboxymethylation , deacetylation etc . the derivatives are widely used in the fields of chemical industry , medicine , food , cosmetics , printing and dyeing , papermaking , environmental protection and agriculture etc . chitin is the ba
甲壳素经过化学修饰和改性，如磺化羧甲基化脱乙酰化等可获得具有特殊性质和用途的甲壳质系列衍生物，在化工医药食品化妆品印染造纸环保农业等领域具有广泛用途。 |
