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Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Objective To search for the most effective condition of extracting quercetin from Semen Plantaginis ．Methods Single factor experiments of extracting quercetin from Litchi Semen Plantaginis were carried out by HPLC ．Ultrasonic pow- er ，extracting time ，methanol percentage and solid／liquid ratio were selected as critical factors ．Orthogonal array design L９（３４ ） was carried out to search for the most efficient condition to extract quercetin ．Results The influential factors for quercetin ex- traction were as follows ，solid／liquid ratio ＞ ultrasonic power ＞ methanol percentage ＞ extracting time ．The most optimal condition was to use ４０％ methanol to extract for ４０ min with ２００ W ultrasonic power and a solid／liquid ratio of １ ∶ ４０ （g／ml） ． Conclusion Under this optimal condition ，the extraction yield of quercetin reached ０ ．７９％ ．This condition offered a simple ， stable and effective process to extract Quercetin from Semen Plantaginis. [ABSTRACT FROM AUTHOR]