title: Studies on the microwave extraction of the yellow pigment from Rabdosia serra (Maxim.) Hara.
abstract: A new method of microwave extraction was used to extract the yellow pigment from Rabdosia serra (Maxim.) Hara. The extraction processes were investigated and the optimal conditions were determined as follows: raw material is 2. 0000 g dry powder, the extraction agent is 95% alcohol, the ratio of raw material to extraction agent is 1:60 (g:ml) , microwave power is 464 W, extraction time is 350 s, extraction times is 3. Under the optimal conditions, extraction rate is 90.6%, productive rate is 12.7%, colority E (1%, 330 nm) is 53.3 and pH value of the extractive is 6.0. Compared with solvent extraction, microwave extraction reduces extraction time from 6 h to 350 s and increases extraction rate from 90.4% to 90.6%.
authors.affiliation: School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275.
authors.forename: Yu
authors.initials: Y
authors.lastname: Li
authors.forename: Minrui
authors.initials: M
authors.lastname: Liu
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification; D000431:Ethanol; D037602:Isodon / Q000737:chemistry*; D008872:Microwaves; D010860:Pigments, Biological / Q000302:isolation & purification*; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013678:Technology, Pharmaceutical / Q000379:methods
chemical_list: D004365:Drugs, Chinese Herbal; D010860:Pigments, Biological; D000431:Ethanol