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Portable and Label-free Detection of Blood Bilirubin with Graphene-isolated-Au-nanocrystals Paper Strip.

A new interesting article has been published in Anal Chem. 2018 Oct 22. doi: 10.1021/acs.analchem.8b04058. [Epub ahead of print] and titled:

Portable and Label-free Detection of Blood Bilirubin with Graphene-isolated-Au-nanocrystals Paper Strip.

Authors of this article are:

Zou YX, Zhang Y, Xu Y, Chen Y, Huang S, Lyu Y, Duan H, Chen Z, Tan W.

A summary of the article is shown below:

Point-of-care testing (POCT) devices represent a growing field that aims to develop low-cost, rapid, sensitive diagnostic testing platforms that are portable and self-contained. Surface-enhanced Raman spectroscopy (SERS) is an approach has shown high potential in POCT technology. However, the specificity or ability to uniquely detect a desired biomarker in complex biological samples is a key factor for translating SERS technologies to POCT. Herein, we fabricated cellulose SERS strips (CS) decorated with novel plasmonic nanoparticles, termed graphene-isolated-Au-nanocrystals (GIANs), for the portable detection of complex biological samples. This CS@GIANs SERS strip was used to detect free bilirubin (BR) in blood of newborn, a biomarker of jaundice, without sample labeling or pre-preparation. CS@GIANs showed superior affinity to hydrophobic BR molecules compared to typical SERS substrate, which reduced the steric hindrance effect from the nonspecific binding of BR with serum albumin in blood and improved sensitivity. Meanwhile, with the separation property of cellulose chromatography papers, CS@GIANs showed superior anti-interference to other biomolecules that had been previously adsorbed on the SERS strip. Moreover, the SERS signal from the graphitic shell of GIANs could be used as a stable internal calibration standard, which improved the reproducibility and accuracy of Raman analysis. Such cellulose SERS strip holds high potential for enhancing current efforts in the development of rapid and low-cost point-of-care diagnostic testing.

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