Microwave-assisted extraction （MAE） of isoflavones from Belamcanda chinensis was studied using ethanol as the solvent. The single factor experiment and the orthogonal method were used to optimize the MAE condition. ...Microwave-assisted extraction （MAE） of isoflavones from Belamcanda chinensis was studied using ethanol as the solvent. The single factor experiment and the orthogonal method were used to optimize the MAE condition. It was concluded that two doses of intermittent microwave power radiation, 300 W each for 4 rain, were needed for extraction. The mass ratio of solvent to material was 8：1 and the alcohol mass fraction was 80%. The extracted liquor was then concentrated under vacuum and degreased with petroleum ether. The yield of total isofiavones was about 8.8% and the contents of tectoridin and iridin were 67.6% and 16.3% respectively. Compared with direct-heating extraction （DHE）, MAE may shorten extracting duration, reduce solvent consumption, and improve yield and purity of isoflavones from Belamcanda chinensis.展开更多
Two new isoflavonoids, 6-methoxy-5,7,8,4′-tetrahydryoxyisoflavone (1) and 4′-methoxy -5,6-dihydroxyisoflavone-7-O-β-d-glucopyranoside (2), were isolated from the rhizomes of Belamcanda chinensis (L.) DC. Their stru...Two new isoflavonoids, 6-methoxy-5,7,8,4′-tetrahydryoxyisoflavone (1) and 4′-methoxy -5,6-dihydroxyisoflavone-7-O-β-d-glucopyranoside (2), were isolated from the rhizomes of Belamcanda chinensis (L.) DC. Their structures were elucidated by extensive spectroscopic evidence including 1D NMR, 2D NMR, MS and IR spectra.展开更多
The new flavone, 5,4′-dihydroxy-6,7-methylenedioxy-3′-methoxyflavone, and one new isoflavone glycoside, 3′,5′-dimethoxy irisolone-4′-O-β-d-glucoside were isolated from the rhizomes of Belamcanda chinensis. Their...The new flavone, 5,4′-dihydroxy-6,7-methylenedioxy-3′-methoxyflavone, and one new isoflavone glycoside, 3′,5′-dimethoxy irisolone-4′-O-β-d-glucoside were isolated from the rhizomes of Belamcanda chinensis. Their structures were established based on the spectroscopic methods.展开更多
A new isoflavonoid, 5, 6, 7, 3＇-terahydroxy-8, 4＇, 5＇-trimethoxyisoflavone （1）, along with 10 known isoflavonoids, namely 5, 6, 7, 4＇-tetrahydroxy-8-methoxyisoflavone （2）, irilone （3）, genistein （4）, tecto...A new isoflavonoid, 5, 6, 7, 3＇-terahydroxy-8, 4＇, 5＇-trimethoxyisoflavone （1）, along with 10 known isoflavonoids, namely 5, 6, 7, 4＇-tetrahydroxy-8-methoxyisoflavone （2）, irilone （3）, genistein （4）, tectorigenin （5）, irigenin （6）, irisflorentin （7）, dichotomitin （8）, dimethyltectorigenin （9）, iridin （10）, and tectoridin （11）, was isolated from the alcohol extract of the rhizomes of Belamcanda chinensis （L.） DC. The structures of these compounds were elucidated on the basis of results of spectroscopic analysis.展开更多
文摘Microwave-assisted extraction （MAE） of isoflavones from Belamcanda chinensis was studied using ethanol as the solvent. The single factor experiment and the orthogonal method were used to optimize the MAE condition. It was concluded that two doses of intermittent microwave power radiation, 300 W each for 4 rain, were needed for extraction. The mass ratio of solvent to material was 8：1 and the alcohol mass fraction was 80%. The extracted liquor was then concentrated under vacuum and degreased with petroleum ether. The yield of total isofiavones was about 8.8% and the contents of tectoridin and iridin were 67.6% and 16.3% respectively. Compared with direct-heating extraction （DHE）, MAE may shorten extracting duration, reduce solvent consumption, and improve yield and purity of isoflavones from Belamcanda chinensis.
文摘Two new isoflavonoids, 6-methoxy-5,7,8,4′-tetrahydryoxyisoflavone (1) and 4′-methoxy -5,6-dihydroxyisoflavone-7-O-β-d-glucopyranoside (2), were isolated from the rhizomes of Belamcanda chinensis (L.) DC. Their structures were elucidated by extensive spectroscopic evidence including 1D NMR, 2D NMR, MS and IR spectra.
文摘The new flavone, 5,4′-dihydroxy-6,7-methylenedioxy-3′-methoxyflavone, and one new isoflavone glycoside, 3′,5′-dimethoxy irisolone-4′-O-β-d-glucoside were isolated from the rhizomes of Belamcanda chinensis. Their structures were established based on the spectroscopic methods.
基金Supported by the National Natural Science Foundation of China （30170103）.
文摘A new isoflavonoid, 5, 6, 7, 3＇-terahydroxy-8, 4＇, 5＇-trimethoxyisoflavone （1）, along with 10 known isoflavonoids, namely 5, 6, 7, 4＇-tetrahydroxy-8-methoxyisoflavone （2）, irilone （3）, genistein （4）, tectorigenin （5）, irigenin （6）, irisflorentin （7）, dichotomitin （8）, dimethyltectorigenin （9）, iridin （10）, and tectoridin （11）, was isolated from the alcohol extract of the rhizomes of Belamcanda chinensis （L.） DC. The structures of these compounds were elucidated on the basis of results of spectroscopic analysis.
