Performance characteristics of a new photometer with a moving filter tape for luminescence assay

Abstract

The performance characteristics of a new photometer that incorporated a reaction system consisting of a movable filtration tape have been studied for use with the firefly luciferase assay for adenosine 5'-triphosphate. Precision, linearity, and sensitivity are given for measuring a graded series of constant-light emitters, concentrations of adenosine 5'-triphosphate, and washed bacterial cells. Precision ranged from 1 to 10% coefficient of variation. The coefficient of correlation was 0.9985 for 7x108 to 7x103 bacteria per ml; however, the accuracy decreased at the low levels. The sample processing time was 2 min for a 1-ml sample. This instrument shows potential for many applications in quantitating small numbers of organisms, e.g. pollution, water monitoring, and clinical infection detection.