NDLI: Photochemical decoration of gold nanoparticles on polymer stabilized magnetic microspheres for determination of adenine by surface-enhanced Raman spectroscopy

Content Provider	Springer Nature Link
Author	Alula, Melisew Tadele Yang, Jyisy
Copyright Year	2014
Abstract	Magnetic microspheres decorated with gold nanoparticles (AuNPs) were prepared and used for the determination of adenine by surface-enhanced Raman scattering (SERS). Magnetic particles were first synthesized by coprecipitation of solutions containing iron(II) and iron(III) ions with ammonium hydroxide. Subsequently, the magnetic particles were suspended into a solution of poly(divinylbenzene-co-methyl methacrylate) to yield polymer-stabilized magnetic microspheres. These were further decorated with AuNPs via a new photochemical reduction method. The magnetic microspheres were characterized by XRD patterns and SEM images. They are shown to represent highly SERS-active substrates by giving an enhancement by almost 7 orders of magnitude compared to conventional Raman spectroscopy. Several factors that affect the photochemical reduction to form the AuNPs were examined. It is found that the concentration of gold ion, UV irradiation time, and citrate concentration have more impact on the reaction rate than on the morphologies of the AuNPs. The gold-decorated magnetic microspheres are highly stable in aqueous solution and capable of concentrating nucleobases. A linear response of the SERS signal to adenine in concentrations up to 10 μM is found, with a linear regression coefficient of 0.997. The detection limit is estimated to a few hundreds of nM (at an SNR of 3). Based on its specific Raman peak at 734 cm−1, adenine can be selectively determined without interference by other nucleobases, and a recovery higher than 95 % could be obtained. Graphical Abstract Magnetic microspheres decorated with gold nanoparticles were prepared and used for the determination of adenine by surface-enhanced Raman scattering. Based on its specific Raman peak at 734 cm−1, adenine can be selectively determined without interference by other nucleobases, and the recovery is higher than 95 %
Starting Page	1017
Ending Page	1024
Page Count	8
File Format	PDF
ISSN	00263672
Journal	Microchimica Acta
Volume Number	182
Issue Number	5-6
e-ISSN	14365073
Language	English
Publisher	Springer Vienna
Publisher Date	2014-11-30
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Magnetic microspheres Gold nanoparticles Surface-enhanced Raman scattering Photoreduction Nanochemistry Nanotechnology Characterization and Evaluation of Materials Analytical Chemistry Microengineering
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry

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