结果与结论：随着相对分子质量和取代度的增加，粒子稳定性增强，临界胶束质量浓度降低。
RESULTS AND CONCLUSION: With the degree of substitution and molecular weights increased, the stability of the nanoparticles enhanced, critical micelle concentration decreased.
当取代度和相对分子质量相同时，随着投料比的增加，载药量增加而包封率降低。
Higher feed ratio could lead to higher loading capacity and lower encapsulation efficiency under the same degree of substitution of cholesteryl moiety and molecular weights of parent pullulan.
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