Pt-Au Dendritic Nanoparticles with High Oxidase-like Activity for Detection of Ascorbic Acid

doi:10.15541/jim20200005

Abstract

Abstract:

Due to high stability and sensitivity, inorganic nanomaterials with enzyme-like activity have brilliant application prospects. Tuning the enzyme-like activity plays great significance for promoting the development of nanozymes. In this work, Pt-Au dendritic nanoparticles (Pt-Au DNPs) with good uniformity and stability were synthesized by a simple liquid phase reduction method, and used to colorimetrically detect ascorbic acid (AA) by using their oxidase-like activity to catalyze the oxidation of TMB (3,3′,5,5′-tetramethylbenzidine). The oxidase-like activity was found to be highly influenced by the composition and structure of Pt-Au dendritic nanoparticles, and the relationship between kinetic parameters and nanoparticle structure was investigated. Quantitative analysis of ascorbic acid in the 1-15 μmol/L range was performed with good linear relationship, and the detection limit was 78 nmol/L. At the same time, it’s found that continuous reaction would reduce the catalytic performance of Pt-Au DNPs, but still has the potential to be reused, which is not common. Data from this research not only suggests a method for synthesizing Pt-Au DNPs, but also shows its potential for AA analysis in biological samples.

Key words: Pt-Au dendritic nanostructure, oxidase-like activity, colorimetric method, ascorbic acid

CLC Number:

TQ174

CHENG Qin, YANG Yong, YANG Lili. Pt-Au Dendritic Nanoparticles with High Oxidase-like Activity for Detection of Ascorbic Acid[J]. Journal of Inorganic Materials, 2020, 35(10): 1169-1176.

Figures/Tables 22

References 34

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Sample	Added/(μmol·L^-1)	Found/(μmol·L^-1)	Recovery/%	RSD/(%, n=3)
Juice	0	5.53	-	4.1
	3.12	8.86	103.71	3.2
	6.25	12.01	103.68	3.4

Sample	Added/(μmol·L^-1)	Found/(μmol·L^-1)	Recovery/%	RSD/(%, n=3)
Juice	0	5.53	-	4.1
	3.12	8.86	103.71	3.2
	6.25	12.01	103.68	3.4

Catalyst	Substrate	K_m/(mmol·L^-1)	Ref.
BiW₉Cu₃	TMB	0.29	[1]
CeO₂		0.8-3.8	[2]
Hg^2+/Citrate-AgNPs		0.23	[3]
N-CQDs		0.515	[4]
Cu-Ag/rGO		0.634	[5]
Cu NPs		1.047	[6]
Lysozyme-PtNPs		0.63	[7]
Fe₃O₄@C		0.38	[8]
Pt-Au DNPs		0.22	This work

Catalyst	Substrate	K_m/(mmol·L^-1)	Ref.
BiW₉Cu₃	TMB	0.29	[1]
CeO₂		0.8-3.8	[2]
Hg^2+/Citrate-AgNPs		0.23	[3]
N-CQDs		0.515	[4]
Cu-Ag/rGO		0.634	[5]
Cu NPs		1.047	[6]
Lysozyme-PtNPs		0.63	[7]
Fe₃O₄@C		0.38	[8]
Pt-Au DNPs		0.22	This work

Catalyst	Linear range/(μmol·L^-1)	LOD/(μmol·L^-1)	Ref.
FeCo NPs@PNC	0.5-28	0.38	[9]
N-CQDs	5-40	1.773	[4]
Cu-Ag/rGO	1-30	3.6	[4]
Cu NPs	1-10	0.68	[6]
LaF₃:Ce,Tb	8-10	2.4	[10]
CuO/Pt	1-600	0.796	[11]
MIL-88	2.57-10.1	1.03	[12]
Pt-Au DNPs	1-15	0.078	This work