Molybdenum disulfide nanosheets coated multiwalled carbon nanotubes composite for highly sensitive determination of chloramphenicol in food samples milk, honey and powdered milk

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• 作者：Mani Govindasamy^a ; Shen-Ming Chen^a ; ^{smchen78@ms15.hinet.net" class="auth_mail" title="E-mail the corresponding author} ; Veerappan Mani^a ; ^b ; ^{veera.678@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Rajkumar Devasenathipathy^c ; Rajaji Umamaheswari^d ; K. Joseph Santhanaraj^d ; Anandaraj Sathiyan^e
• 关键词：Food safety ; Veterinary antibacterial drug ; Layered 2D transition metal dichalcogenides ; Nanomaterials and nanocomposites ; Hybrid materials ; Thin films ; Antibiotics ; Electrochemical sensor
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：485
• 期：Complete
• 页码：129-136
• 全文大小：3469 K

文摘

We have described a hybrid material that consists of molybdenum disulfide nanosheets (MoS₂) coated on functionalized multiwalled carbon nanotubes (f-MWCNTs) for sensitive and selective determination of chloramphenicol (CAP). The MoS₂/f-MWCNTs nanocomposite was successfully prepared through a hydrothermal process and its structure was characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, electrochemical impedance spectroscopy and cyclic voltammetry. The MoS₂/f-MWCNTs nanocomposite holds excellent electrochemical properties and it displays excellent electrocatalytic ability to CAP. Under optimized working conditions, the nanocomposite film modified electrode responds linearly to CAP in the concentration range of 0.08–1392 μM. The detection limit was obtained as 0.015 μM (±0.003). The electrode has high level of selectivity in presence of large excess concentrations of interfering species. In addition, the modified electrode offers satisfactory repeatability, reproducibility and stability. The practical applicability of the electrode was demonstrated in food samples such as, milk, powdered milk and honey samples and the recoveries are agreeable which clearly revealed its practical feasibility in food analysis.