ABSTRACT
An electrochemical L-glycine biosensor was fabricated at the surface of carbon nanotube (CCNT) electrode, obtained from coconut oil. The investigation was done by linear sweep voltammetry at CCNT electrode in 102phosphate buffer solution at pH 6.5. The influence of the experimental parameters on the peak currents of L-glycine, such as pH, time interval, and scan rates, were optimized. Under optimum conditions, the peak current was found to be linear in the L-glycine concentration range from 1-100 μΜ with a sensitivity of ~2.953 pA-pM−1-cm−2 (R = 0.99698) and response time of about 5 s. Some characteristic studies of the nonenzymatic biosensor, such as reproducibility, substrate specificity, and storage stability, have also been studied. The results suggested that CCNT electrode is reliable and sensitive enough for the determination of L-glycine in standard solution as well as real sample too.
