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Ultrasensitive colorimetric carcinoembryonic antigen biosensor based on hyperbranched rolling circle amplification
Literature Information
Publication Date
2014-05-02
DOI
10.1039/C4AN00417E
Impact Factor
4.616
Authors
Kai Liang, Shuiting Zhai, Zhidong Zhang, Xiaoyang Fu, Jingwei Shao, Zhenyu Lin, Bin Qiu, Guo-nan Chen
View Original
Abstract
In this study, a hyperbranched rolling circle amplification (HRCA)-based colorimetric biosensor for carcinoembryonic antigen (CEA) is developed with high sensitivity and specificity. A CEA aptamer can bind with its target (CEA) to form a complex due to their high affinity, and the introduced CDNA cannot hybridize with the aptamer. Thus, free CDNA can propagate the HRCA reaction to form a large number of single-stranded DNA (ss-DNA). ss-DNA can be easily adsorbed onto AuNPs and prevent salt-induced AuNPs aggregation, which causes the change in the color of the system. It is found that the absorbance intensity ratio (A520/A660) has a linear relationship with the concentration of the target in the range of 5 pM−0.5 nM, and the detection limit is as low as 2 pM (S/N = 3).
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Analyst
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653
Analyst publishes analytical and bioanalytical research that reports premier fundamental discoveries and inventions, and the applications of those discoveries, unconfined by traditional discipline barriers.
Recommended Compounds
Oxalic acid compound with cyclohexylsulfamothioic O-acid (11)
CAS Number:
31895-22-4
Molecular Formula:
C7H13NO4S3
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