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肺炎喘嗽液原生产工艺是水煮醇沉法以除去杂质使药液澄清，现改为用壳聚糖絮凝法，并进行了定性、定量、稳定性等实验对照。结果表明，对该制剂用壳聚糖絮凝法代替醇沉法同样可达质量标准，但对含淀粉药材较多的中成药就不适合用壳聚糖作澄清剂。
The original production process of pneumonia and asthmatic fluid is boiling water and alcohol precipitation method to remove impurities to clarify the liquid. Now it is changed to chitosan flocculation method, and qualitative, quantitative, stability and other experimental control. The results showed that the chitosan flocculation instead of the alcohol precipitation method can also meet the quality standards for the preparation, but the Chinese patent medicine containing more starch-containing herbs is not suitable for the use of chitosan as a clarifying agent.