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Silica Gel Fractionation. Final extracts were separated on 10 g of silica gel (60F254 from Merck) placed in a 10 mm diameter buret plugged with deactivated glass wool. Elutions were first carried out with 20 mL of pentane and then successively with 10 mL of various n-pentane/dichloromethane mixtures (80/20, 60/40, 40/60, 20/80) and finally 20 mL of pure dichloromethane. Sixteen fractions (labeled in order of elution from 1A to 16A) each containing 5 mL were successively recovered and then reduced to 200 ¨ªL using a Kuderna- Danish column. Each fraction was analyzed by GC-MS ÉÏÃæµÄÒ»¶Î»°£¬ÊÇÎÒÔÚÎÄÏ×ÉÏÃæ¿´¼ûµÄ£¬ÊÇÖù·ÖÀ뻯ºÏÎµ«ÊÇÏÖÔÚÎҹؼüÊDz»¶®£¬ÕâÀïÓõĵ÷ÁÏÊǹ轺»¹ÊÇÖÐÐÔÑõ»¯ÂÁ£¿ ¾ÍÊǵÚÒ»¾ä»°²»ÊǺܶ®£¿£¿£¿£¿£¿£¿£¿ 60F254ÊÇÖÐÐÔÑõ»¯ÂÁµÄ°å×Ó ÓÃÖÐÐÔÑõ»¯ÂÁµÄ°å×ÓÅܰå×Ó£¬ÄÇôװÖù×ÓµÄʱºòÒ»¶¨ÒªÓÃÖÐÐÔÑõ»¯ÂÁÌîÁÏÂ𣿠ϣÍû´óÏÀÖ¸µãһϠ|
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