Abstract
A variety of luminol-based substrates and either an autoradiographic film or a charge-coupled device (CCD) imaging system were used for chemiluminescence detection of c-type cytochromes. The Pierce Femto peroxidase substrate was at least 10 times more sensitive when using film than the highly cited 3,3 ′,5,5 ′-tetramethylbenzidine (benzidine derivative) staining method and 50 times more sensitive when using a CCD imaging system. Film or CCD imaging result in highly sensitive and quantitative signals. The quantitative detection of c-type cytochromes from single colonies or from less than 1 ml of a bacterial culture is possible.
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