P. Nyren, APYRASE IMMOBILIZED ON PARAMAGNETIC BEADS USED TO IMPROVE DETECTION LIMITS IN BIOLUMINOMETRIC ATP MONITORING, Journal of bioluminescence and chemiluminescence, 9(1), 1994, pp. 29-34
A novel technique that is useful for the control of the luminescence o
utput in a bioluminometric assay has been developed. The method relies
on the immobilization on paramagnetic beads of an enzyme that is capa
ble of catalysing the hydrolysis or oxidation of the substrate for the
luminescence reaction. This technique has been used for control of th
e level of ATP in the luciferin-luciferase system. Biotinylated apyras
e was bound to streptavidin coated paramagnetic beads and added to the
assay mixture. The level of ATP in the reaction mixture was then conv
eniently controlled using an external magnet. The possible use of this
approach in other systems, such as the bacterial luciferase-oxidoredu
ctase is discussed.