We report a new design of an optical biochip based on a double integrating sphere system to quantify the absolute number of the emitted photons or the total photon flux by a whole cell bioluminescent biosensor, for water toxicity detection, based on genetically engineered Escherichia coli bacteria carrying a recA::luxCDABE promoter–reporter fusion. The new design of the double integrating sphere system does not require any external standard light source for calibration of the tested bioluminescent solution and allows a direct determination of the total photon flux of the bioluminescent solution. In our design, we required that the two spheres are symmetric (have the same radius and reflectance) with a surface area larger than the cut cap area between the spheres.
© 2009 Optical Society of America
Medical Optics and Biotechnology
Original Manuscript: January 2, 2009
Revised Manuscript: March 12, 2009
Published: June 5, 2009
Vol. 4, Iss. 8 Virtual Journal for Biomedical Optics
Ramiz Daniel, Ronen Almog, Yelena Sverdlov, Sharon Yagurkroll, Shimshon Belkin, and Yosi Shacham-Diamand, "Development of a quantitative optical biochip based on a double integrating sphere system that determines absolute photon number in bioluminescent solution: application to quantum yield scale realization," Appl. Opt. 48, 3216-3224 (2009)