Changes of polysaccharide content, functional properties and in vitro release of peach gum before and after improvement / 中草药

ABSTRACT

Objective To analyze the difference of polysaccharides content, property characterization, and in vitro release between the original peach gum and improved peach gum, and to find the change rule, so as to provide the basis for its further application as the new delivery material. Methods The content of polysaccharides was measured by the phenol-sulfuric acid method combined with ultraviolet spectrophotometry. The pH value of liquid cement was measured by pH meter. The dynamic viscosity of liquid cement was measured by the Brookfield DV-Ⅱ Pro viscometer. The solubility and swelling ratio of rubber powder were measured by the weighing method. The moisture-absorption rate at different relative humidity of rubber powder was measured by the method of controlling humidity with the desiccator. With three index components (ephedrine, pseudoephedrine, and scopolamine) as the standards, HPLC and the release test were applied to determine the accumulated release rate of Chuanping adhesive tablets (CAT). Results Original peach gum In the three producing areas of Xishui in Guizhou Province, Xinfeng in Jiangxi Province, and Suixian in Hubei Province, the content of polysaccharides respectively was 84.30%, 81.52%, and 77.84%. The pH value of 1% liquid cement was 5.63, 5.60, and 5.88. The dynamic viscosity of 1% liquid cement was 30.8, 28.5, and 25.9 mPa∙s. The solubility of rubber powder was 6.08%, 5.75%, and 5.12%. The swelling ratio of rubber powder was 34.22%, 29.66%, and 26.25%. The 12 h moisture-absorption rate of the improved peach gum polysaccharose at RH of 43% was 28.19%, 27.02%, and 26.44%; and at RH of 81% was 38.22%, 35.26%, and 34.64%. The 2 h cumulative release amount in vitro of methamphetamine, pseudoephedrine, and scopolamine of Chuanping adhesive tablets were 95.41%—98.84%, 96.05%—97.11%, and 96.35%—98.21%. Improved peach gum In the three producing areas of Xishui, Xinfeng, and Suixian, the content of polysaccharides respectively was 96.92%, 94.76%, and 93.35%. The pH of 1% liquid cement was 7.10, 7.08, and 7.12. The dynamic viscosity of 1% liquid cement was 318.4, 289.6, and 266.4 mPa∙s. The solubility of rubber powder was 17.82, 16.73, and 16.38 g. The swelling ratio of rubber powder was 84.98%, 81.55%, and 79.82%. The 12 h moisture-absorption rate of the improved peach gum polysaccharose at RH of 43% was 41.22%, 39.93%, and 39.20%; and at RH of 81% was 60.88%, 58.48%, and 57.17%. The 12 h cumulative release amount in vitro of methamphetamine, pseudoephedrine, and scopolamine of CAT were 97.88%—98.36%, 97.59%—98.56%, and 97.72%—98.12%. Conclusion Compared with the original peach each gum, the content of polysaccharides, dynamic viscosity, solubility, swelling ratio, and moisture-absorption rate, and sustained release property of the improved peach gum were all improved remarkably, and the solution was also neutral. These results show that the improved peach gum can be further developed and applied as a new sustained release material.