Abstract:

β-Sitosterol has numerous biological functions such as antioxidation and so on. β-Cyclodextrin (β-CD) was taken as wall materia1 to prepare β-sitosterol microcapsules with better antioxidant effect. The preparation of β -sitosterol microcapsules was optimized using single factor and orthogonal array design methods, followed by a comparison of protective effect against lard oxidation with unmicroencapsulated β -sitosterol and vitamin E. The results showed that the optimal conditions for β-sitosterol microencapsulation were determined to be: water amount 60 mL, temperature 50 ℃, length of stirring time 50 min and ratio of 0.05 g/mL ethyl acetate solution of β -sitosterol to β -CD 1:10 (mL/g). Under these conditions, the embedding ratio of β-sitosterol was 87.98%. β-Sitosterol microcapsules could significantly protect lard from oxidation in a dosedependent way and was superior to unmicroencapsulated β-sitosterol and vitamin E.

Key words: β-sitosterol, β-cyclodextrin, microencapsulation, antioxidant effect