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Fluorometric Determination of Lipopolysaccharides via Changes of the Graphene Oxide-Enhanced Fluorescence Polarization Caused by Truncated Aptamers

Fluorometric Determination of Lipopolysaccharides via Changes of the Graphene Oxide-Enhanced Fluorescence Polarization Caused by Truncated Aptamers

Hua Ye, Nuo Duan, Huajie Gu, Haitao Wang, Zhouping Wang

Mikrochim Acta. 2019 Feb 15;186(3):173.

PMID: 30771102

Abstract:

A broad-spectrum ssDNA aptamer containing 80 nucleotides (LA80) and capable of binding to four different sources of lipopolysaccharides (LPSs) was truncated. Two strategies are used to produce truncated aptamers of different length. The results show that LA27, a 27-nt aptamer, retained broad-spectrum capability and has a higher affinity (Kd = 46.2 ± 9.5 nM). A graphene oxide based fluorescence polarization assay (excitation/emission wavelengths: 485/520 nm) was worked out using FAM-labeled LA27. It can detect LPSs from Salmonella entericaserotype typhimurium, Pseudomonas aeruginosa 10 and Escherichia coli 055:B5 with enhanced performance (4.8 to 29-fold improvements) compared to LA80. The assay can be performed within 30 min, and the detection limits are 38.7, 88.0 and 154 ng·mL-1, respectively. Graphical abstract Schematic presentation of the assay: A shorter aptamer, with higher affinity than its original aptamer, was obtained by truncated strategies. This core aptamer lead to release easily and enhance the sensivity of the GO-based fluorescence polarization assay.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS7413124	Lipopolysaccharides from Pseudomonas aeruginosa 10			Price

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