Figure 6From: Iron specificity of a biosensor based on fluorescent pyoverdin immobilized in sol-gel glassFluorescence quenching of pyoverdin immobilized in sol-gel B. 1.0 ml of either 20 mM ferric chloride (Fe3+) or 20 mM ferrous sulfate (Fe2+) was added at the times indicated by the arrows, for a final iron concentration (II or III) of 0.555 mM. (ex/em = 382/480 nm)Back to article page