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【求助】PLGA采用DCC-NHS做活化酯純化問題 已有9人參與
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我采用的是DCC和氮羥基琥珀酰亞胺連用做縮合劑,將PLGA端羧基做成活化酯。采用二氯做溶劑,DCC和NHS均過量,進行下步反應(yīng)前必須除盡DCC,各位大俠有什么好辦法沒啊。我要急死了。。。。 先謝過了。。。。 |
化學(xué)反應(yīng) | 羧基活化EDC,NHS |
金蟲 (小有名氣)
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PEGylation strategies for active targeting of PLA/PLGA nanoparticles. Journal of Biomedical Materials Research Part A PLGA was reacted with DCC and NHS in an organic solvent at 23 C to activate the carboxylic acids to the semi- stable amine-reactive activated NHS-ester of PLGA (PLGA-NHS). After a specific reaction time, the polymer mixture was filtered to remove insoluble dicyclohexyl urea byproduct. The solution was concentrated, transferred to two 45-mL Teflon centrifuge tubes (<4 mL per tube) and the polymer was precipitated with ethyl ether or -20 C methanol. The polymer was pelleted by centrifugation and the supernatant removed. The pellet was dissolved in DCM (<1 mL), precipitated, and centrifuged once more to remove excess DCC, NHS, and remaining dicyclohexyl urea byproduct. |
金蟲 (小有名氣)
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