Note: effect of high hydrostatic pressure on extraction of flavonoids in propolis.

摘要

Effects of high hydrostatic pressure (HHP) were investigated on the extraction of flavonoids (chrysin and galangin) from propolis. Propolis samples were exposed to HHP at 100-600 MPa for 1-15 min at room temp., prior to HPLC analysis. HHP led to considerable increases in yields; exposure to HHP for as little as 1 min resulted in higher yields than extraction under ambient conditions for 7 days. As HHP increased from 100 to 500 MPa, extraction yields of chrysin increased from 0.956 ± 0.032 to 1.135 ± 0.031% and those of galangin increased from 0.637 ± 0.023 to 0.825 ± 0.03%. Further increases in pressure did not lead to further increases in yields. HHP did not damage the structure of the 2 flavonoids.