Carrier-mediated photodiffusion membranes

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Science  16 Sep 1977:
Vol. 197, Issue 4309, pp. 1177-1179
DOI: 10.1126/science.897659


Reversible photochromic reactions can be coupled to carrier-mediated transport processes in membranes to bring about the separation or concentration of selected permeants. Carbon monoxide has been pumped against of fourfold concentration gradient by differentially illuminating a hemoglobin membrane. The extent of concentration of photochromic ligands increases with light intensity and is reversible. Nonphotochemically sensitive ligands can also be transported by coupling with phostosensitive carrier-mediated systems.