AGFD 187 |
| Pressurized hot (subcritical) water and ethanol are environmentally friendly high-diffusion solvents that can be used for fast and efficient extraction of health-beneficial compounds from agricultural- and forestry- biomass wastes. Betulin, an anti-inflammatory compound, was extracted from birch bark using ethanol at 90°C and 50 bar, resulting in quantitative yield within only 15 min of extraction. Furthermore, antioxidants in the bark were extracted at different temperatures and showed higher antioxidant activity with increasing temperature using a radical scavenging method with DPPH (2,2-diphenyl-1-picrylhydrazylhydrate). In another project, polyphenolic glycosides were extracted from onion within 15 min of extraction using water at 120°C and 50 bars. Of particular interest is quercetin, a potent antioxidant and anti-neurodegenerative compound, which is found in both red and yellow onions. In summary, we have developed fast and gentle processes for extraction and analysis of betulin and other health-beneficial compounds in birch bark and polyphenolic compounds in onion waste. |
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Food Bioactives and Nutraceuticals: Production, Chemistry, Analysis and Health Effects
8:00 AM-11:00 AM, Wednesday, August 22, 2007 BCEC -- 255, Oral
Division of Agricultural & Food Chemistry |