求翻译：本章采用H2O2-Ac 体系氧化壳聚糖，得到一系列低分子量的壳聚糖，并对其进行了N-甲基化改性。用粘度法测定了降解后壳聚糖的分子量，用红外光谱(FT-IR)对降解前后壳聚糖进行了对比，对N-甲基化的壳聚糖进行了表征；并用紫外光谱(UV)测定了壳聚糖及N-甲基化的壳聚糖不同 pH 值时的透光率，得出N-甲基化的壳聚糖 pH 敏感性更强是什么意思？

This chapter h2o2-ac system oxidation of chitosan, a series of low molecular weight chitosan, and n-methyl modification. A molecular weight of degraded chitosan was determined by viscosity method were compared before and after degradation of chitosan by infrared spectroscopy (ft-ir), were characteri

This chapter 2 adopted H O Ac system 2 - Carbon dioxide is present in sugar, and a range of low molecular weight of poly-sugar, and it was N - methylation modified. Viscosity measured the law after the fall of the sugar present in molecular weight, and the infrared spectrum (FT - IR) in the front an

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This chapter uses Chitosan oxide H2O2-Ac system, a range of low-molecular-weight Chitosan, and n-methylation modification. With stick of method determination has degradation Hou shell poly sugar of molecular volume, with infrared spectrum (FT-IR) on degradation before and after shell poly sugar for

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