Ap

MUP-^ MUF (methylumbelliferone) + P

AP activity can easily be measured by measuring the MUF production at fluorescence emission of 460 nm under excitation light of 350 nm.

The second type biosensor however, is based on algal chlorophyll fluorescence measurement at excitation of 482 nm and emission of 683 nm.

5. The substrate MUP was placed in the Tris buffer solution (0.1 M, pH 8.5) containing 1 mM MgCl2 as enzyme activator, and AP activity was measured in terms of fluorescence intensity.

6. AP activity can also be measured with another substrate, p-nitrophenyl phosphate (pNPP). But preference should be given to MUP for its higher sensitivity.

7. After running the toxic solutions in the biosensor, it should be clean thoroughly and reversibility of the biosensor should be tested by running the reference solution each time.

Acknowledgements

I would like to thank Mr. Laxuman Sharma and Mr. Akhilesh Kumar Singh for their kind technical assistance.

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