ZFIN ID: ZDB-PUB-110602-31
Chitosan coated carbon fiber microelectrode for selective in vivo detection of neurotransmitters in live zebrafish embryos
Ozel, R.E., Wallace, K.N., and Andreescu, S.
Date: 2011
Source: Analytica chimica acta   695(1-2): 89-95 (Journal)
Registered Authors: Wallace, Kenneth
Keywords: carbon fiber microelectrode, chitosan, ascorbic acid, interferences, in vivo detection of neurotransmitters, zebrafish, intestine
MeSH Terms:
  • Animals
  • Carbon/chemistry*
  • Chitosan/chemistry*
  • Electrochemistry
  • Embryo, Nonmammalian/chemistry*
  • Microelectrodes
  • Neurotransmitter Agents/analysis*
  • Serotonin/analysis*
  • Zebrafish/embryology*
PubMed: 21601035 Full text @ Anal. Chim. Acta
We report the development of a chitosan modified carbon fiber microelectrode for in vivo detection of serotonin. We find that chitosan has the ability to reject physiological levels of ascorbic acid interferences and facilitate selective and sensitive detection of in vivo levels of serotonin, a common catecholamine neurotransmitter. Presence of chitosan on the microelectrode surface was investigated using scanning electron microscopy (SEM) and cyclic voltammetry (CV). The electrode was characterized using differential pulse voltammetry (DPV). A detection limit of 1.6nM serotonin with a sensitivity of 5.12nA/μM, a linear range from 2 to 100nM and a reproducibility of 6.5% for n=6 electrodes were obtained. Chitosan modified microelectrodes selectively measure serotonin in presence of physiological levels of ascorbic acid. In vivo measurements were performed to measure concentration of serotonin in the live embryonic zebrafish intestine. The sensor quantifies in vivo intestinal levels of serotonin while successfully rejecting ascorbic acid interferences. We demonstrate that chitosan can be used as an effective coating to reject ascorbic acid interferences at carbon fiber microelectrodes, as an alternative to Nafion, and that chitosan modified microelectrodes are reliable tools for in vivo monitoring of changes in neurotransmitter levels.