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Mikrochim Acta. 2018 Jan 27;185(2):138. doi: 10.1007/s00604-018-2690-0.

A palladium-platinum bimetal nanodendritic melamine network for signal amplification in voltammetric sensing of DNA.

Author information

1
Laboratory of Reproductive Biology, School of Public Health and Management, Chongqing Medical University, Box 197#, No.1, Yi Xue Yuan Road, Yuzhong District, Chongqing, 400016, People's Republic of China.
2
College of Pharmacy, Chongqing Medical University, Chongqing, 400016, People's Republic of China.
3
Laboratory of Reproductive Biology, School of Public Health and Management, Chongqing Medical University, Box 197#, No.1, Yi Xue Yuan Road, Yuzhong District, Chongqing, 400016, People's Republic of China. hejunlin@cqmu.edu.cn.

Abstract

A sandwich-type electrochemical DNA sensor is described for the detection of oligonucleotides typical for MECP2 gene mutations. Palladium nanoparticles (PdNPs) and platinum nanoparticles (PtNPs) were used to synthesize flower-like PdPt nanodendrites (NDs) by a one-pot method. The PdPt NDs possess a high specific surface area and excellent catalytic capabilities. They served as the carrier for the signal DNA probe (SP) and simultaneously catalyze the reduction of hydrogen peroxide (H2O2). The PdPt NDs were modified with melamine, and this results in the formation of a PdPt-melamine network through stable interactions between the PdPt NDs and the three amino groups of each melamine molecule. The network exhibits excellent catalytic ability in enhancing the current signal response in the voltammetric detection of MECP2 gene mutation, best measured at -0.4 V vs. SCE and using H2O2 as the electrochemical probe. In addition, gold nanoflowers were electrodeposited on the electrode interface in order to accelerate electron transfer and to capture the capture probe. The sensor is stable and can detect MECP2 gene mutations in the 1 fmol·L-1 to 1 nmol·L-1 concentration range, with a 0.33 fmol·L-1 lower detection limit at an S/N ratio of 3. Graphical abstract Schematic presentation of electrodes for the determination of the X-linked gene methyl-CpG-binding protein 2 (MECP2). The sensor is based on the electrooxidation of added H2O2 by using the melamine modified palladium platinum bimetal nanodendrites as network signal amplification strategy. This versatile platform expands studies on the detection of monogenic disease.

KEYWORDS:

MECP2 gene mutations; Network; One-pot method; Palladium nanoparticles; PdPt nanodendrites; Platinum nanoparticles; Sandwich-type electrochemical DNA sensor

PMID:
29594436
DOI:
10.1007/s00604-018-2690-0
[Indexed for MEDLINE]

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