求翻译：以自然界中广泛存在的高分子聚合物壳聚糖为原料，在浓碱性条件下采用一氯乙酸与之反应，生成具有较高水溶性的O-羧甲基壳聚糖，试验选取了壳聚糖与一氯乙酸的质量比、氢氧化钠的浓度、反应温度和反应时间四个因素为考察对象，按照L9（34）正交实验设计制备了不同取代度和水溶性的O-CMCS，筛选出最优处方的制备条件为 最优处方O-CMCS的取代度为 ；其次将O-CMCS与酸酐反应，向其中引入了硫辛酸，增强了O-CMCS的疏水性，形成了一种新型两亲性高分子药物辅料，并采用红外光谱（IR）、差式扫描量热法（DSC）等对其进行了结构表征。是什么意思？

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