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http://dx.doi.org/10.5806/AST.2010.23.1.060

Bioluminescence immunoassay for neurotransmitter, serotonin using aequorin as a Label  

Ryu, Ji-Eun (Department of Chemistry, Seoul Women's University)
Choi, Hee-Seon (Department of Chemistry, Seoul Women's University)
Park, Ho-Young (Department of Chemistry, Seoul Women's University)
Rhee Paeng, In-Sook (Department of Chemistry, Seoul Women's University)
Publication Information
Analytical Science and Technology / v.23, no.1, 2010 , pp. 60-67 More about this Journal
Abstract
A sensitive competitive heterogeneous bioluminescence immunoassay for serotonin was developed using photoprotein, aequorin as a label for the first time with the optimal assay conditions; especially, serotoninavidin conjugate was prepared by Mannich reaction and the synthetic process of serotonin-avidin conjugate was optimized by controlling the initial molar ratios of serotonin, formaldehyde and avidin (1:12,000:25). The developed bioluminescence immunoassay for serotonin showed good sensitivity (LOD of 0.68 ng/mL) with wide area of dynamic range ($5.0{\times}10^{-10}\;M\sim5.0{\times}10^{-7}\;M$). (cf. the range for serotonin in human blood serum is $151{\pm}45\;ng$/mL). In addition, cross-reactivity studies demonstrated that 5-methoxytryptamine showed some cross-reactivity (28.0%), whereas 3-methylindole, melatonin and 5-hydroxylindole-3-acetic acid showed no crossreactivity, and good recoveries were obtained in serum. Thus, this developed method provides a good tool to monitor serotonin in serum.
Keywords
Bioluminescence immunoassay; Aequorin; Neurotransmitter; Serotonin;
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