ºÝºÝߣshows by User: margarethgallo71 / http://www.slideshare.net/images/logo.gif ºÝºÝߣshows by User: margarethgallo71 / Sun, 02 Feb 2014 15:23:02 GMT ºÝºÝߣShare feed for ºÝºÝߣshows by User: margarethgallo71 Quantitative determination of 20-hydroxyecdysone in methanolic extract of twigs from Vitex polygama Cham. /margarethgallo71/2006-jcb 2006jcb-140202152302-phpapp01
20-Hydroxyecdysone (20E) is effective in stimulating protein synthesis, therefore, it has been largely used as anabolic agent in several commercial formulas. Phytochemical study of methanolic extract of twigs from Vitex polygama, used in traditional Brazilian medicine as emenagogue, yielded a large quantity of 20E. This finding led us to developing and validating a simple and reliable method to determine 20E in the surveyed extract. Chromatographic separation of 20E was achieved on a phenyl-hexyl-based column using reversed elution mode. Extract was cleaned-up by solid phase extraction employing C18 cartridge, and an absolute recovery of 97% was acquired. External standard and standard addition calibration graphs were obtained and good linearity was accomplished (r > 0.999 for both curves). The limit of quantification and detection were determined. The results for accuracy fell within the −5 to +7% range.]]>
20-Hydroxyecdysone (20E) is effective in stimulating protein synthesis, therefore, it has been largely used as anabolic agent in several commercial formulas. Phytochemical study of methanolic extract of twigs from Vitex polygama, used in traditional Brazilian medicine as emenagogue, yielded a large quantity of 20E. This finding led us to developing and validating a simple and reliable method to determine 20E in the surveyed extract. Chromatographic separation of 20E was achieved on a phenyl-hexyl-based column using reversed elution mode. Extract was cleaned-up by solid phase extraction employing C18 cartridge, and an absolute recovery of 97% was acquired. External standard and standard addition calibration graphs were obtained and good linearity was accomplished (r > 0.999 for both curves). The limit of quantification and detection were determined. The results for accuracy fell within the −5 to +7% range.]]> Sun, 02 Feb 2014 15:23:02 GMT /margarethgallo71/2006-jcb margarethgallo71@slideshare.net(margarethgallo71) Quantitative determination of 20-hydroxyecdysone in methanolic extract of twigs from Vitex polygama Cham. margarethgallo71 20-Hydroxyecdysone (20E) is effective in stimulating protein synthesis, therefore, it has been largely used as anabolic agent in several commercial formulas. Phytochemical study of methanolic extract of twigs from Vitex polygama, used in traditional Brazilian medicine as emenagogue, yielded a large quantity of 20E. This finding led us to developing and validating a simple and reliable method to determine 20E in the surveyed extract. Chromatographic separation of 20E was achieved on a phenyl-hexyl-based column using reversed elution mode. Extract was cleaned-up by solid phase extraction employing C18 cartridge, and an absolute recovery of 97% was acquired. External standard and standard addition calibration graphs were obtained and good linearity was accomplished (r > 0.999 for both curves). The limit of quantification and detection were determined. The results for accuracy fell within the −5 to +7% range. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/2006jcb-140202152302-phpapp01-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> 20-Hydroxyecdysone (20E) is effective in stimulating protein synthesis, therefore, it has been largely used as anabolic agent in several commercial formulas. Phytochemical study of methanolic extract of twigs from Vitex polygama, used in traditional Brazilian medicine as emenagogue, yielded a large quantity of 20E. This finding led us to developing and validating a simple and reliable method to determine 20E in the surveyed extract. Chromatographic separation of 20E was achieved on a phenyl-hexyl-based column using reversed elution mode. Extract was cleaned-up by solid phase extraction employing C18 cartridge, and an absolute recovery of 97% was acquired. External standard and standard addition calibration graphs were obtained and good linearity was accomplished (r &gt; 0.999 for both curves). The limit of quantification and detection were determined. The results for accuracy fell within the −5 to +7% range.
Quantitative determination of 20-hydroxyecdysone in methanolic extract of twigs from Vitex polygama Cham. from Margareth Gallo
]]> 601 4 https://cdn.slidesharecdn.com/ss_thumbnails/2006jcb-140202152302-phpapp01-thumbnail.jpg?width=120&height=120&fit=bounds document Black http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 https://cdn.slidesharecdn.com/profile-photo-margarethgallo71-48x48.jpg?cb=1591960390 I desire utopia, I live in an eternal romance, I believe in God