| Perfume is an necessary additive that can promote the quanlity of detergent, but perfume is influenced by eviroment conditons such as light,heat and radiation easily if just add it to detergent.Besides, detergent is often soluble and the perfume in detergent release to water instantly so that aroma in fabric will volatilize quickly. This research pay attention to perfume microencapsulated in chitosan and in the form of microemulsion absorded in pronous materials to reserve most perfume during washing which will release slowly in fabric.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 chitosan emulsions were evaluated by the emusifying effectiveness test of Tweens as single emulsifiers and with Spans, sucrosesters and monoglyceride as co-emusifiers.The content of the emulsifiers, the conditions of spry-drying and the ratio of chitosan and orange oil were researched in system to confirm the best process of microencapsulation. Results showed that the optimum co-emulsifiers were Tween40 and Span20 with the ratio 4:1. The best spry-drying conditions were: the co-emusifier was 5% in orange oil(w/w),the ratio of chitosan and range oil was 2:1(w/w),the inlet temperayure was 150℃. The encapsulated rate of the powdered product was 92.9%.Corn starch was used as the raw material to produce porous starch through complex enzymolysis. There are four main factors deciding the quality of porous starch: the ratio ofα-amylase and glucan glucohydrolase, co-enzyme concentration, enzymolysis time and corn starch concentration. Testing the oil absorbing rate and yield of porous stach confirmed the best process conditions: the ration of glucan glucohydrolase andα-amylase was 2:1; co-enzyme concentration was 1.0%; enzymolysis reaction time was 14h; corn starch concentration was 20%, and the best oil absorbing rate was 99.8% with the particle size about 17μm. The compositions of orange oil microemulsion confirmed by the three-phase diagram were as followed: 13% orange oil, 23% Brij56/ethanol (2:1) and 64% water. The perfume fixed product was prepared by absorbing orange oil microemulsion to porous starch and the loading rate was 65%.As indicated in the research, chitosan microencapsulation was superior to perfume in porous product while the particle size became larger in the alkaline medium (pH10 water and detergent solution). After washing, chitosan microencapsules could retain perfume for 21 days in the cotton fabrics and microemulsion fixed product could release perfume for 25 days. However the effect of perfume reservation was not so notable in terylene fabrics. Microemulsion could improve perfume reservation in terylene fabrics and released aroma for 30 days.Higher temperature and humidity(45℃,50%RH) would influence the store stability of both two kinds of perfume controlled releasing products,but the perfume fixed products were more sensitive. If stored in the condition of 25℃and 30% RH, more than 60% perfume could be retained in products during 3 months,that indicated the perfume controlled releasing products had a good store stability.
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