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羟丙基甲基纤维素(HPMC)作为种衣成膜剂的应用性能研究

2018-08-30王海燕

天津农业科学 2018年6期

王海燕

摘 要:羟丙基甲基纤维素(HPMC) 具有良好的水溶、分散、增稠、保水和成膜性能,可用于药品的包衣,本试验将其用于种子包衣用成膜剂,采用标准测试方法,设置4个不同HPMC添加浓度,测定其成膜时间、包衣均匀度、包衣脱落率、发芽率等。结果表明,添加5% HPMC成膜效果最佳,成膜时间6 min,包衣均匀度98.5%,脱落率为2.8%,7 d发芽率为90.1%,说明HPMC可作为玉米种子的包衣成膜材料。

关键词:羟丙基甲基纤维素;种子包衣;成膜剂

中图分类号:TQ450.6 文献标识码:A DOI 编码:10.3969/j.issn.1006-6500.2018.06.015

Study on the Application Performance of Hydroxylpropyl MethylCellulose as a kind of Membrane-forming Agent

WANG Haiyan

(Tianjin Red Sun Love For Pharmaceutical Company Limited, Tianjin 300384, China)

Abstract: Hydroxypropyl methyl cellulose (HPMC) has good water solubility, dispersion, thickening, and water and film-forming properties, it could be used for drug coating. The experiment studied the application performance of HPMC as seed membrane-forming agent, 4 different HPMC concentration were set to test the film-forming time, coating uniformity, coating peeling rate, and maize seed germination rate. The results showed that 5% HPMC was the best film, the film time was 6 minutes, the coating uniformity rate was 98.5%, the shedding rate was 2.8%, and 7 d germination rate was 90.1%, indicating that HPMC could be used as the coating material for maize seeds.

Key words: HPMC; seed coating; membrane-forming agent

种子包衣用成膜剂是一种能将种衣剂中农药、微肥、生长调节剂和缓释剂等活性组分黏附于种子表面、固化成膜的物质。当种衣剂处于制剂状态时,成膜剂在水中溶解为胶体,为其他成分在制剂中的悬浮提供支撑骨架,保证种衣剂产品具有一定的黏度;当种衣剂在种子表面干燥后成膜剂聚合为具有一定强度的连续膜,束缚农药成分不致脱落,对衣膜内活性成分起缓释作用。我国现阶段的种子包衣剂仍然存在包衣容易脱落、经常出现包衣层分层、沉淀和不牢固等现象。包衣层的脱落会使得包衣中的有效成分含量降低,从而影响种子包衣技术的推广和应用[1-3]。

羟丙基甲基纤维素(HPMC)为天然纤维素,是经过碱化处理、醚化改性、中和反应以及洗涤干燥等工艺得到的具有水溶性的纤维素衍生物,其来源丰富可再生,环境友好,可以生物降解[4-5]。作为水溶性高分子材料,HPMC具有良好的水溶、分散、增稠、保水和成膜性能,所形成的包衣薄膜无色无味、坚韧、透明度好,广泛地用作药物包衣和缓释制剂的控速聚合物材料[6-7]。……

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