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Reference type: Journal
Authors: Qiu HM, Luo CN, Sun M, Lu FG, Fan LL, Li XJ
Article Title: Determination of l-tryptophan based on graphene oxide-magnetite-molecularly imprinted polymers and chemiluminescence.
Publication date: 2012
Journal: Talanta
Volume: 98
Page numbers: 226-230.
DOI: 10.1016/j.talanta.2012.06.078
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0039914012005450

Abstract: A new method for determination of l-tryptophan (l-try) using the flow injection chemiluminescence (FI-CL) system of KMnO4-SnCl2-CHOH based on a graphene oxide-magnetite-molecularly imprinted polymer (GM-MIP) is described. The l-try GM-MIP was synthesized using graphene oxide (G) which improved the adsorption capacity as carrier, and magnetite nanoparticles which made the polymers easier to use in the sensor. The adsorption performance and properties were characterized. The GM-MIP was used in CL analysis to increase the selectivity and the possible mechanism was also discussed. The CL sensor responded linearly to the concentration of l-try over the range from 2.10 x 10-7 to 7.09 x 10-4 M with a detection limit of 2.11 x 10-8 M (3σ). The relative standard deviation (RSD) for the determination of 3.0 x 10-5 M l-try was 2.40% (n=11). On the basis of speediness and sensitivity, the sensor is reusable and shows a great improvement in selectivity and adsorption capacity over other sensors. The sensor has been used for the determination of l-try in drug samples
Template and target information: l-tryptophan, l-try
Author keywords: Graphene oxide, Magnetite, molecularly imprinted polymer, Flow injection chemiluminescence, L-tryptophan

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