Antibacterial activity of Ag-Au alloy NPs and chemical sensor property of Au NPs synthesized by dextran.
Gold and silver-gold alloy nanoparticles with mean diameter of 10nm and narrow size distribution were prepared by reduction of the correspondent metal precursors using aqueous dextran solution which acts as both a reducing and capping agent. The formation of nanoparticles was characterized by UV-vis spectroscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD) and dynamic light scattering (DLS). The silver and gold nanoparticles exhibited absorption maxima at 425 and 551 nm respectively; while for the bimetallic Ag-Au alloy appeared 520 nm in between them. TEM images showed monodispersed particles in the range of 8-10nm. The crystallinity of the nanoparticles was assured by XRD analysis. DLS data gave particle size distribution. The dextran stabilized Au nanoparticles used as a colorimetric sensor for detection and estimation of pesticide present in water. The dextran stabilized Ag-Au alloy nanoparticles exhibited interesting antimicrobial activity against bacteria at micromolar concentrations.
Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India; Department of Chemistry, Tamralipta Mahavidyalaya, Tamluk, Purba Medinipur 721636, India.
Kalipada
K
Bankura
Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India.
Dipanwita
D
Maity
Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India.
Md Masud Rahaman
MM
Mollick
Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India.
Dibyendu
D
Mondal
Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India.
Biplab
B
Bhowmick
Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India.
Indranil
I
Roy
Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India.
Tarapada
T
Midya
Department of Botany, Molecular and Applied Mycology and Plant Pathology Laboratory, University of Calcutta, Kolkata 700 019, India.
Joy
J
Sarkar
Department of Chemical and Biological Engineering, Industrial Membrane Research Institute, University of Ottawa, 161 Louis Pasteur St., Ottawa, ON K1N 6N5, Canada.
Dipak
D
Rana
Department of Botany, Molecular and Applied Mycology and Plant Pathology Laboratory, University of Calcutta, Kolkata 700 019, India.
Krishnendu
K
Acharya
Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India. Electronic address: dipankar.chattopadhyay@gmail.com.
Dipankar
D
Chattopadhyay
D000497:Alloys / Q000737:chemistry* / Q000494:pharmacology*; D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D003911:Dextrans / Q000737:chemistry*; D004355:Drug Stability; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D010575:Pesticides / Q000032:analysis / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D014867:Water / Q000737:chemistry
D000497:Alloys; D000900:Anti-Bacterial Agents; D003911:Dextrans; D010575:Pesticides; D014867:Water; D012834:Silver; D006046:Gold
Ag–Au alloy; Antimicrobial activity; Colorimetric sensor; Dextran stabilized nanoparticles; Nanoparticles