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微球（microsphere）是指药物分散或被吸附在高分子、聚合物基质中而形成的微粒分散体系。制备微球的载体材料很多,主要分为天然高分子微球(如淀粉微球，白蛋白微球，明胶微球，壳聚糖等)和合成聚合物微球(如聚乳酸微球)。