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- W2013048220 abstract "A novel hormone conjugate has been prepared by a coupling reaction between modified estrone and dextran. In order to provide a suitable reactive estrone derivative for coupling with dextran and a spacer between the drug carrier and the hormone, the steroidal sex hormone was succinylated by reaction with succinic anhydride. Subsequently, the carboxylic acid terminal of succinylated estrone was further reacted with thionyl chloride to replace the hydroxy group with chlorine to make a better leaving group. The ester bond was employed as labile linkage between the hormone and the biopolymer carrier backbone so that the coupled estrogen could be released from the conjugate via ester hydrolysis. Structures of the modified estrone and dextran–estrone conjugate were determined by elemental analysis and by FTIR, 1H and 13C NMR spectroscopies. The degree of substitution (D.S.) per anhydroglucose (AHG) unit was 0.33 (11.0 mol-% of estrone moieties), as calculated from the 1H NMR spectrum. In vitro hydrolysis of the conjugate in aqueous phosphate buffer/ethanol solutions at pH 8.0 and 7.4 and 37°C released estrone was completed within a few days and followed zero-order kinetics." @default.
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- W2013048220 date "1998-08-01" @default.
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- W2013048220 title "Dextran–estrone conjugate: synthesis and in vitro release study" @default.
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- W2013048220 doi "https://doi.org/10.1016/s0144-8617(97)00125-2" @default.
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