Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 475, Issue -, Pages 46-56Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2016.04.044
Keywords
Green synthesis; Metal nanoparticles; Plant extracts; Graphene oxide; Chloramphenicol; Antibiotics; Food safety; Milk; Eye drops; Modified electrode
Categories
Funding
- Ministry of Science and Technology, Taiwan [MOST-104-2410-H-182-015, NSC101-2113-M-027-001-MY3]
- Research Fund of Chang Gung Memorial Hospital [BMRP280A]
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A simple and rapid green synthesis using Bischofia javanica Blume leaves as reducing agent was developed for the preparation of gold nanoparticles (AuNPs). AuNPs decorated graphene oxide (AuNPs/GO) was prepared and employed for the sensitive amperometric determination of chloramphenicol. The green biosynthesis requires less than 40 s to reduce gold salts to AuNPs. The formations of AuNPs and AuNPs/GO were evaluated by scanning electron and atomic force microscopies, UV-Visible and energy dispersive X-ray spectroscopies, X-ray diffraction studies, and electrochemical methods. AuNPs/GO composite film modified electrode was fabricated and shown excellent electrocatalytic ability towards chloramphenicol. Under optimal conditions, the amperometric sensing platform has delivered wide linear range of 1.5-2.95 mu M, low detection limit of 0.25 mu M and high sensitivity of 3.81 mu A mu M-1 cm(-2). The developed sensor exhibited good repeatability and reproducibility, anti-interference ability and long-term storage stability. Practical feasibility of the sensor has been demonstrated in food samples (milk, powdered milk and honey) and pharmaceutical sample (eye drops). The green synthesized AuNPs/GO composite has great potential for analysis of food samples in food safety measures. (C) 2016 Elsevier Inc. All rights reserved.
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