Document Detail

Development of direct competitive enzyme-linked aptamer assay for determination of dopamine in serum.
MedLine Citation:
PMID:  21168553     Owner:  NLM     Status:  In-Process    
A rapid and cost-effective screening method based on a competitive enzyme-linked aptamer assay (ELAA) for dopamine (DA) in serum has been optimized and validated. In this paper, we report advantageous sensitivity and specificity of aptamer assays as compared to the existing antibody based-immunoassays. The RNA aptamer (67 mer) was immobilized via site-directed immobilization with biotin both at the 3'-end on aptamer and at neutravidin plate. Various factors such as incubation temperature, divalent ion - Mg(2+) ion and treatment of serum solution were evaluated for the performance of ELAA. The aptamer was incubated for 1h at 4°C in the assay buffer containing 5 mM Mg(2+) ion, and serum was diluted (1:9, serum:assay buffer) and filtrated through a 3 kDa dialysis membrane to extract the proteins present in the serum. Assay was performed with 0.01 μg mL(-1) of aptamer and 1.205×10(-7)M DA-HRP conjugate using the optimized method. A dose-response curve was constructed, and the limit of detection and a dynamic range for the DA were determined as 1.0×10(-12)M and four orders (1.0×10(-7)M to 5.0×10(-11) M) of magnitude, respectively. The correlation diagram of the absorbance obtained both in buffer and in serum has shown a good agreement with the correlation coefficient (R(2)=0.9872): Abs. (in serum)=0.9612×Abs. (in buffer)-0.0556. The cross-reactivity evaluation demonstrated that norepinephrine showed some cross-reactivity (3.68%) whereas 3-methoxytyramine, epinephrine, homovanillic acid and 3,4-dihydroxyphenylacetic acid showed almost no cross-reactivity (<1%). Percent recoveries of DA in serum were quite satisfactory (∼95%). This paper describes usefulness of the aptamer assay in monitoring DA in human serum.
Hoyoung Park; Insook Rhee Paeng
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-11-13
Journal Detail:
Title:  Analytica chimica acta     Volume:  685     ISSN:  1873-4324     ISO Abbreviation:  Anal. Chim. Acta     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2010-12-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370534     Medline TA:  Anal Chim Acta     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  65-73     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier B.V. All rights reserved.
Department of Chemistry, Seoul Women's University, Seoul 139-774, Republic of Korea.
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