Journal
BIOSENSORS & BIOELECTRONICS
Volume 155, Issue -, Pages -Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2020.112094
Keywords
Lactate sensor; LDH immobilization; alpha-Cyano-4-hydroxycinnamate (alpha CHC); N; S-doped porous carbon; Bifunctional conducting polymer
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2019R1A2C1002531]
- National Research Foundation of Korea [2019R1A2C1002531] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A robust amperometric sensor was developed for the lactate detection in the extracellular matrix of cancer cells. The sensor was fabricated by separately immobilizing nicotinamide adenine dinucleotide (NAD+) onto a carboxylic acid group and lactate dehydrogenase (LDH) onto an amine group of bi-functionalized conducting polymer (poly 3-(((2,2':5',2''-terthiophen)-3'-yl)-5-aminobenzoic acid (pTTABA)) composited with N, S-doped porous carbon. Morphological features of the composite layer and sensor performance were investigated using FE-SEM, XPS, and electrochemical methods. The experimental parameters were optimized to get the best results. The calibration plot showed a linear dynamic range between 0.5 mu M and 4.0 mM with the detection limit of 112 +/- 0.02 nM. The proposed sensor was applied to detect lactate in a non-cancerous (Vero) and two cancer (MCF-7 and HeLa) cell lines. Among these cell lines, MCF-7 was mostly affected by the administration of lactate transport inhibitor, alpha-cyano-4-hydroxycinnamate (alpha CHC), followed by HeLa and Vero, respectively. Furthermore, the effect of alpha CHC concentration and treatment time on the lactate level in the cell lines were demonstrated. Finally, cytotoxicity studies were also performed to evaluate the effect of alpha CHC on cell viability.
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