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wmn1984(½ð±Ò+1): 2010-08-24 10:10:08
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wmn1984(½ð±Ò+1): 2010-08-24 18:28:44
wmn1984(½ð±Ò+2):°ÑʣϵĽð±Ò¶¼¸øÄãÁË£¬Ì«¸ÐлÁË¡£¡£¡£¡£ 2010-08-24 18:36:56
yusen_1982(½ð±Ò+1):»¶Ó­ÌÖÂÛ£¡ 2010-08-24 20:07:37
americanyk(½ð±Ò+1):Thank you 2010-08-24 18:28:43
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.
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