Abstract:

In order to elevate the utilization value of propolis residue from supercritical carbon dioxide fluid (SFE-CO2) extraction, the residue was reextracted with absolute alcohol, and the extract obtained was subjected to comparisons with alcohol and SFE-CO2 extracts from propolis for differences in flavonoid compound composition and antioxidant effect and to microencapsulation by lyophilization. Total flavonoid content in the alcohol extract from propolis residues left after SFE-CO2 extraction was 118.798 mg/kg, which was close to the alcohol extract from propolis. The protective effects of different propolis products on the peroxidation of lard were different and deceased in the following order: the alcohol extract from propolis＞ the alcohol extract from propolis residue left after SFE-CO2 extraction ＞ the SFE-CO2 extract from propolis. Thus, the alcohol extract from propolis residue left after SFE-CO2 extraction is a superior antioxidant. Its microcapsules were exquisite powder with a loose texture and the embedding rate was 69.87%.

Key words: propolis, recycling, total flavonoids, antioxidation, microcapsule