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|標題:||Isolation and purification of 3,5-diprenyl-4-hydroxycinnamic acid (artepillin C) in Brazilian propolis by supercritical fluid extractions||作者:||Lee, Y.N.
|關鍵字:||supercritical fluids extraction;propolis;DHCA;column purification;anti-oxidative ability;carbon-dioxide extraction;ferric nitrilotriacetate;biological-properties;identification;fractionation;flavonoids;dermatitis;protection;mice;oil||Project:||Separation and Purification Technology||期刊/報告no：:||Separation and Purification Technology, Volume 54, Issue 1, Page(s) 130-138.||摘要:||
This study individually investigated organic solvents and supercritical carbon dioxide (SC-CO2) extractions to recover 3,5-diprenyl-4-hydroxycinnamic acid (DHCA) from Brazilian propolis. An experimental design was applied to show the effect of two independent operational parameters on the recovery and purity of DHCA for these SC-CO2 extractions. Our experimental results indicated that temperature and addition ratio of ethyl-acetate are two major factors to influence the recovery and purity of DHCA in the extracts. A design point at 50 degrees C (323 K) and 4 wt.% ethyl-acetate addition ratio subsequently responded that DHCA recoveries were substantially enhanced from 3.7 wt.% (no adding) to 13.9 wt.% (6 wt.% adding) and DHCA purities in the SC-CO2 extracts were all over 40 wt.%, much better than that of Soxhlet ethyl-acetate extraction (16.9 wt.%). A further purification of the SC-CO2 extract using a normal phase Silica-gel 60 resin column chromatography without two solvent partitions could yield a purified product containing 95 wt.% DHCA. The total DHCA recovery was twice higher than that when the solvent partition was used. Finally, the inhibition of human serum low density lipid revealed a positive relationship between the DHCA purity in the SC-CO2 extracts and the anti-oxidative ability. (C) 2006 Elsevier B.V. All rights reserved.
|Appears in Collections:||化學系所|
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