title: Antioxidant and catalytic applications of silver nanoparticles using Dimocarpus longan seed extract as a reducing and stabilizing agent.
abstract: In this study, a simple and environmental friendly method was developed for the synthesis of silver nanoparticles (Ag-NPs) using Dimocarpus longan seed extract as a source of reducing and stabilizing agent. The appearance of a surface plasmon resonance peak at 432nm confirmed the synthesis of silver nanoparticles (UV-visible spectroscopy). The biosynthesized Ag-NPs were face centered cubic structures (XRD) with an approximate particle size of 40nm (TEM). Optimization study revealed that 10mL of plant extract (2mM AgNO3) at 180min of incubation resulted the optimum product synthesis. Poly-phenolic compounds were majorly involved in the reduction of silver ions into Ag-NPs (FT-IR). The catalytic activities of Ag-NPs were assessed against the photo-catalytic degradation of methylene blue and chemo catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). The results indicated that the prepared Ag-NPs have strong chemo catalytic activity with a complete reduction of 4-NP to 4-AP within 10min. Similarly, Ag-NPs displayed higher photo-catalytic activity (K=0.12) as compared to commercial Ag-NPs (K=0.003). In addition, the silver nanoparticles exhibited a promising antioxidant activity in scavenging DPPH radicals. The findings of this study conclude that the biosynthesized Ag-NPs are promising agent possessing strong catalytic and reducing properties.
authors.affiliation: School of Science, Beijing University of Chemical Technology, Beijing 100029, PR China. Electronic address: faheem148@yahoo.com.
authors.forename: Faheem Ullah
authors.initials: FU
authors.lastname: Khan
authors.affiliation: School of Science, Beijing University of Chemical Technology, Beijing 100029, PR China. Electronic address: chenym@mail.buct.edu.cn.
authors.forename: Yongmei
authors.initials: Y
authors.lastname: Chen
authors.affiliation: School of Science, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors.forename: Naeem Ullah
authors.initials: NU
authors.lastname: Khan
authors.affiliation: Department of Chemistry, University of Science and Technology Bannu, 28100, Khyber Pakhtunkhwa, Pakistan.
authors.forename: Zia Ul Haq
authors.initials: ZU
authors.lastname: Khan
authors.affiliation: School of Science, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors.forename: Arif Ullah
authors.initials: AU
authors.lastname: Khan
authors.affiliation: School of Science, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors.forename: Aftab
authors.initials: A
authors.lastname: Ahmad
authors.affiliation: School of Science, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors.forename: Kamran
authors.initials: K
authors.lastname: Tahir
authors.affiliation: School of Science, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.affiliation: Institute of Chemical Sciences, University of Peshawar, Peshawar 25120, Khyber Pakhtunkhwa, Pakistan.
authors.forename: Muhammad Riaz
authors.initials: MR
authors.lastname: Khan
authors.affiliation: School of Science, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors.forename: Pingyu
authors.initials: P
authors.lastname: Wan
mesh_terms: D000975:Antioxidants / Q000494:pharmacology*; D002384:Catalysis; D019684:Magnoliopsida / Q000737:chemistry* / Q000196:embryology; D053768:Metal Nanoparticles / Q000737:chemistry*; D008854:Microscopy, Electron; D012639:Seeds / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D000975:Antioxidants; D012834:Silver
keywords: 4-Ntirophenol; Antioxidant activity; Biosynthesis; Dimocarpus longan seed; Methylene blue; Silver nanoparticle