目的 研究以交联明胶为壁材的复合维生素微胶囊的制备工艺及体外释放行为。方法 在过氧化氢存在下,以阿魏酸为交联剂,通过辣根过氧化物酶催化,制备交联明胶,考察反应条件对交联度的影响;然后以交联明胶为壁材,以盐酸硫胺素(维生素B1)、核黄素(维生素B2)、盐酸吡哆醇(维生素B6)、叶酸、烟酰胺的混合物为芯材,采用喷雾干燥工艺,按不同壁材/芯材比,制备复合维生素微胶囊。用扫描电镜和激光粒度仪,对微胶囊进行了表征。用荧光分光光度计,对微胶囊的包埋率、荷载量以及在模拟胃液和模拟肠液中的释放行为,进行了测试和分析。结果 在温度为40 ℃、pH值为8.0、明胶浓度为9%(W/V)、阿魏酸浓度为40 mmol·L-1、交联时间为24 h的反应条件下,交联明胶的交联度较高,达到10%。以此交联明胶为壁材制备的微胶囊,其中维生素的包埋率在85%以上;少数呈表面光滑的圆球形,大多数表面有凹陷;平均粒径为15.27 μm;当壁材/芯材为10/1(W/W)时,维生素在模拟胃液和模拟肠液中完全释放的时间,分别为30和16 min,都比明胶为壁材时相应延长。结论 以交联明胶为壁材,采用喷雾干燥工艺,可以制备出包埋率高、具有一定的缓释性能的复合维生素微胶囊。
Abstract
OBJECTIVE To study the preparation and in vitro release profile of compound vitamin microencapsules using cross-linked gelatin as wall material. METHODS At the presence of hydrogen peroxide, the cross-linked gelatin was prepared with ferulic acid as the cross-linking agent. During this reaction, horseradish peroxidase was used as the catalyst. Influences of reaction conditions on the cross-linking degree were investigated. Compound vitamin microcapsules were prepared by spray-drying technique using the obtained cross-linked gelatin as wall material. The core material was the mixture of thiamine hydrochloride (vitamin B1), riboflavin (vitamin B2), pyridoxine hydrochloride (vitamin B6), folic acid and nicotinamide. The effect of the ratio of wall material to core material on the encapsulation efficiency and loading of the vitamins were investigated. The size and surface morphology of the compound vitamin microcapsules were characterized. The encapsulation efficiency, loading and in vitro release property of the core material were determined by fluorospectrophotometry. RESULTS A comparatively high cross-linking degree (ca. 10%) of cross-linked gelatin was obtained under the following reaction conditions:temperature of 40 ℃, pH value of 8.0, gelatin concentration of 9% (W/V), ferulic acid concentration of 40 mmol·L-1 and reaction time of 24 h. The vitamins were embedded by the cross-linked gelatin and the encapsulation efficiency was more than 85%. Scanning electron microscopy (SEM) study showed that the compound vitamin microcapsules had a regular spherical shape but the majority presented rough surfaces or dents. Particle size analysis indicated that the microcapsules had a mean diameter of 15.27 μm. At the ratio of coating material to core material was 10/1 (W/W), the vitamins encapsulated with the cross-linked gelatin released completely in 30 min in simulated gastric fluid, and they released completely in 16 min in simulated intestinal fluid. They released slower than the vitamins encapsulated with the gelatin accordingly. CONCLUSION Compound vitamin microencapsules with high encapsulation efficiency and sustained release effect can be obtained by spray-drying using cross-linked gelatin as wall material.
关键词
微胶囊 /
复合维生素 /
明胶 /
交联 /
阿魏酸
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Key words
microcapsule /
compound vitamin /
gelatin /
cross-linking /
ferulic acid
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中图分类号：
R944
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参考文献
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