甜橙油壳聚糖微胶囊的制备

Chitosan is an ideal microencapsulation material because it is a biodegradable natural polymer without toxicity. In this research,orange oil was encapsulated in chitosn using the method of spray-drying. A powered product was obtained containing microcapsules with a diameter below 20μm having a smooth and spherical surface.The stability of the emulsions is evaluated by the emusifying effectiveness of single emusifiers such as Tween,Span,sucrosestersand monoglyceride including their co-emusifiers in orange oil.The add content of the emulsifiers, the conditions of spry-drying and the ratio of chitosan and orange oil is researched in system to determine the best process of microencapsulation. Results shows that the optimum co-emulsifiers are Tween40 and Span20 and their ratio is 4:1. Followed are the best spry-drying conditions:the emusifiers is 0.5% in orange oil(W/W),the ratio of chitosan and range oil is 2:1(W/W), the inlet temperayure is 150℃.In that conditons,the encapsulationed ratio of the powder is 93.9%.