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An amperometric ammonium biosensor based on alanine dehydrogenase of Bacillus subtilis and functionalized multiwalled carbonnanotubes was developed by using screen printed electrodes. The output current of the biosensor was increased around 2.4 times at 100mM NH4+ after the addition of functionalized multiwalled carbonnanotubes at the concentration of 0.1μg/ml along with the enzyme. The biosensor...
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