請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/34004
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.
林助傑
Chen, C.R.
Yang, H.L.
Lin, C.C.
Chang, C.M.J.
張傑明
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
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.
URI: http://hdl.handle.net/11455/34004
ISSN: 1383-5866
文章連結: http://dx.doi.org/10.1016/j.seppur.2006.08.028
顯示於類別:化學系所

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