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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38526

Title: Colorimetric detection of platelet-derived growth factors through competitive interactions between proteins and functional gold nanoparticles
Authors: Tzu-En Lin
Wei-His Chen
Yen-Chun Shiang
Chih-Ching Huang
Huan-Tsung Chang
Contributors: 國立臺灣海洋大學:生命科學暨生物科技學系
Keywords: Gold nanoparticles
Aptamer
Platelet derived growth factor
Thrombin
Competitive interactions
Colorimetric assay
Date: 2011
Issue Date: 2016-09-08T07:17:24Z
Publisher: Biosensors and Bioelectronics
Abstract: Abstract: We have developed a colorimetric assay—using aptamer modified 13-nm gold nanoparticles (Apt–Au NPs) and fibrinogen adsorbed Au NPs (Fib–Au NPs, 56 nm)—for the highly selective and sensitive detection of platelet-derived growth factors (PDGF). Apt–Au NPs and Fib–Au NPs act as recognition and reporting units, respectively. PDGF-binding-aptamer (AptPDGF) and 29-base-long thrombin-binding-aptamer (Aptthr29) are conjugated with Au NPs to prepare functional Apt–Au NPs (AptPDGF/Aptthr29–Au NPs) for specific interaction with PDGF and thrombin, respectively. Thrombin interacts with Fib–Au NPs in solutions to catalyze the formation of insoluble fibrillar fibrin–Au NPs agglutinates through the polymerization of the unconjugated and conjugated fibrinogen. The activity of thrombin is suppressed once it interacts with the AptPDGF/Aptthr29–Au NPs. The suppression decreases due to steric effects through the specific interaction of PDGF with AptPDGF, occurring on the surfaces of AptPDGF/Aptthr29–Au NPs. Under optimal conditions [AptPDGF/Aptthr29–Au NPs (25 pM), thrombin (400 pM) and Fib–Au NPs (30 pM)], the AptPDGF/Aptthr29–Au NPs/Fib–Au NPs probe responds linearly to PDGF over the concentration range of 0.5–20 nM with a correlation coefficient of 0.96. The limit of detection (LOD, signal-to-noise ratio = 3) for each of the three PDGF isoforms is 0.3 nM in the presence of bovine serum albumin at 100 μM. When using the AptPDGF/Aptthr29–Au NPs as selectors for the enrichment of PDGF and for the removal of interferences from cell media, the LOD for PDGF provided by this probe is 35 pM. The present probe reveals that the concentration of PDGF in the three cell media is 230 (±20) pM, showing its advantages of simplicity, sensitivity, and specificity.
Relation: 29(1)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38526
Appears in Collections:[生命科學系] 期刊論文

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