NDLI: Evaluation of an efficient and selective adsorbent based on multi-walled carbon nanotubes coated silica microspheres for detecting nucleobases and nucleosides in human urine

Content Provider	Royal Society of Chemistry (RSC)
Author	Di, Duolong Tang, Yanan Zhao, Lei Sun, Xiaoming Guo, Mei
Copyright Year	2015
Abstract	Multi-walled carbon nanotubes (MWCNTs) can be used in analytical chemistry for separation and purification and offer the opportunity to determine low concentration compounds in complex systems. Novel multi-walled carbon nanotube coated silica microspheres (MWCNTs/SiO2) were synthesized by the covalent bonding of amino bonds. The characteristics results obtained from emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy and Brunauer–Emmett–Teller (BET) surface area analysis showed that MWCNTs/SiO2 was successfully prepared. By evaluating the static adsorption capacities of ten nucleobases and nucleosides, the adsorption capacity of the microspheres for adenine (A), guanine (G), uric acid (UA) and xanthosine (X) was found to be significantly stronger than for others. Moreover, the adsorption capacity depends on the pH value, salinity and contact time. It was shown that π–π conjugation and hydrogen bonding interactions were the two main driving forces for the adsorption of target compounds. Adsorption kinetics and adsorption isotherms showed that the adsorption process was a chemical and multilayer adsorption. They could be determined within the test ranges with a good correlation coefficient (r > 0.997). The limits of detection (LOD) for A, G, UA and X were 1.22, 2.02, 0.32 and 2.28 ng mL−1, respectively. The intra- and inter-day relative standard deviations (RSDs) were no more than 6.5%. This procedure therefore afforded a convenient, sensitive and accurate method with a high extraction efficiency for the determination of A, G, UA and X in human urine.
Starting Page	5513
Ending Page	5521
Page Count	9
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	39
Issue Number	7
Journal	New Journal of Chemistry
DOI	10.1039/c4nj01777c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Analytical chemistry Urine Infrared spectroscopy Spectroscopy Adenine Fourier transform Urban area UA Scanning electron microscope Silicon dioxide Guanine Salinity Carbon nanotube Emmett Transmission electron microscopy Fourier Adsorption Carboxylic acid Covalent bond PH Correlation and dependence Hydrogen bond
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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