A pH sensitive carrier is obtained by coating a cyclodextrin vesicle with an adamantane-terminated octapeptide through the formation of an inclusion complex. Upon lowering the pH from 7.4 to 5.0, the formation of peptide beta-sheets on the vesicle surface induces a transition of the bilayer from a sphere to a fiber. This transition is fully reversible and repeatable. The vesicles release their cargo upon fiber formation.
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Versluis et al. (2009) studied this question.
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