Chirality detection of amino acid enantiomers by organic electrochemical transistor.
Biosens Bioelectron
; 105: 121-128, 2018 May 15.
Article
em En
| MEDLINE
| ID: mdl-29412935
Chiral recognition of α-amino acids is attracting increasing interest due to the importance of α-amino acids in protein metabolism as well as in food products and pharmaceuticals. Organic electrochemical transistors (OECTs) with gate electrodes modified with molecularly imprinted polymer (MIP) films were fabricated and successfully used as highly selective and sensitive chiral recognition biosensors for d/l-tryptophan (d/l-Trp) and d/l-tyrosine (d/l-Tyr). The MIP films, which can specifically recognize and has an electrocatalytic effect on the oxidation of Trp and Tyr, together with the amplification function of an OECT, provide a highly sensitive and selective OECT biosensor. The sensor showed a linear response range for l-Trp and L-Tyr from 300â¯nM to 10⯵M with a sensitivity of 3.19 and 3.64 µA/µM, respectivity. And the detection limit for L-Trp and L-Tyr is of 2â¯nM and 30â¯nM (S/N > 3). The selectivity factors of L-Trp, D-Trp, L-Tyr and D-Tyr to their enantiomers are 11.6, 3.5, 14.5 and 2.6, respectively. This method can pave the way for widespread applications of OECT-based sensors in chiral material identification.
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MEDLINE
Assunto principal:
Polímeros
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Tirosina
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Transistores Eletrônicos
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Triptofano
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Técnicas Biossensoriais
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Impressão Molecular
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article