Abstract
A photoresponsive polypeptide membrane composed of poly(L-glutamic acid) (PGA) with 15.5 mol% pararosaniline (rose) groups in the side chains (rose-PGA) were prepared. The rose side chains in the membrane exhibited photodissociation under ultraviolet (UV) light irradiation, yielded hydroxide ions, which resulted in the acceleration of acid dissociation of the neighboring L-glutamic acid moieties. This increase in the dissociation of L-glutamic acid moieties induced the conformational transitions of the rose-PGA membrane at adequate pHs. As a result, the membrane functions of the rose-PGA, such as transport properties and membrane potentials across the membrane, were strongly dependent on UV light irradiation. The photoinduced changes of the membrane functions of the rose-PGA were reversible and synchronized with the conformational responses of the membrane under UV light irradiation.
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