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Recombinant E. coli ACV 1003 (recA::lacZ) wasused to measure low concentrations of DNA-damagingchemicals, which produce β-galactosidase via an SOSregulon system. Very low β-galactosidase activities of lessthan 0.01 unit/ml, βresponse corresponding to the 10 ng/ml (ppb) of DNA damagingchemicals in the environment, can be rapidly determined byusing an alternative interferometric biosensor with opticallyflat thin films of porous silicon rather than by the conventionaltime-consuming Miller’s enzyme assay as wel as the ELISAmethod. In order to enhance the sensitivity in the interferometry,it needs to obtain more uniform distribution and higherbiolinking efficiency, whereas interferometric sensing is rapid,cheap, and advantageous in high throughput by using a60 nm for the target enzyme β-galactosidase to be bound onboth walls of a Si pore and a calyx crown derivative wasapllied as a more eficient biolinker. Furthermore, anti-β-galactosidase was previously functionalized with the biolinkerfor the target β-galactosidase to be specificaly bound. Whenanti-β-galactosidase was bound to the calyx-crown derivative-linked surface, the effective optical thicknes was found tobe thre times as high as that obtained without using anti-β-galactosidase. The resolution obtained was very similar to thataforded by the time-consuming ELISA method; however,the reproducibility was stil unsatisfactory, below 1 unitβ-galactosidase/ml, owing to the microscopic non-uniformdistribution of the pores in the etched silicon surface.

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