A new selective amperometric biosensor for reagentless L-tryptophan determination has been developed using immobilized tryptophan-2-monooxygenase (TMO, EC 1.13,12.3). This enzyme-based biosensor provides a rapid-response detection system for concentrations of L-tryptophan between 25 and 1.000 μM in a batch mode system and between 100 and 50,000 μM in a flow-injection mode. The response time was 30 seconds, and the total analysis time was less than 3 minutes. The biosensor retained catalytic activity and fidelity of phenylalanine and tryptophan response for greater than 4 months with repeated usage. The biosensor selectivity to L-tryptophan was dramatically increased relative to phenylalanine when a competitive inhibitor of TMO, indole acetamide (IA), was included. The biosensor was successfully used for L-tryptophan determination in nutrition broth, giving values identical to those determined by HPLC analysis.
CITATION STYLE
Simonian, A. L., Rainina, E. I., Fitzpatrick, P. F., & Wild, J. (2000). Enhancement of the specificity of an enzyme-based biosensor for L-tryptophan. In Advances in Experimental Medicine and Biology (Vol. 467, pp. 833–840). https://doi.org/10.1007/978-1-4615-4709-9_106
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