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¡°.....In addition to the hydrophobic interactions between PCL and DOX, two other factors, i.e. the PCL crystallinity and hydrogen-bonding interactions
between DOX and PCL, are hypothesized to affect the DLC. Higher PCL crystallinity in the micelle cores will decrease the DLC because only the
amorphous PCL phase is likely to accommodate drug molecules. For semi-crystalline polymers such as PCL, higher molecular weight usually leads to
higher crystallinity. Although the micelle cores constructed with longer PCL segments are generally bigger in size and may encapsulate more drug
molecules, the higher PCL crystallinity may lead to less DOX-loading in the micelles. Meanwhile, the deprotonated DOX contains hydroxyl and amino
groups, which may form hydrogen-bonds with the carbonyl groups of the amorphous PCL. For shorter PCL segments that have lower crystallinity, the H-bonding interactions can enhance the DOX-loading in the micelle cores.¡±

J. of controlled release 98 (2004) 415-426
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4Â¥2010-02-23 19:11:58
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