Abstract
Thylakoid membranes isolated from spinach leaves were immobilized by entrapment in polyvinylalcohol bearing styrylpyridinium groups. The reduced species produced by photosynthetic membranes are oxidized at a platinum working electrode in a microphotoelectrochemical cell. Free and entrapped thylakoids were compared for their responses to inhibition by two herbicides: diuron and atrazine. The detection limits were respectively 2×10 −8 and 2×10 −7 M for diuron and atrazine.
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