%0 Journal Article
%T A Green Approach to Synthesize Silver Nanoparticles in Starch-co-Poly(acrylamide) Hydrogels by Tridax procumbens Leaf Extract and Their Antibacterial Activity
%A Siraj Shaik
%A Madhusudana Rao Kummara
%A Sudhakar Poluru
%A Chandrababu Allu
%A Jaffer Mohiddin Gooty
%A Chowdoji Rao Kashayi
%A Marata Chinna Subbarao Subha
%J International Journal of Carbohydrate Chemistry
%D 2013
%I Hindawi Publishing Corporation
%R 10.1155/2013/539636
%X A series of starch-co-poly(acrylamide) (starch-co-PAAm) hydrogels were synthesized by employing free radical redox polymerization. A novel green approach, Tridax procumbens (TD) leaf extract, was used for reduction of silver ions (Ag+) into silver nanoparticles in the starch-co-PAAm hydrogel network. The formation of silver nanoparticles was confirmed by UV-visible spectroscopy (UV-Vis), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (X-RD) studies. 22% of weight loss difference between hydrogel and silver nanocomposite hydrogel (SNCH) clearly indicates the formation of silver nanoparticles by TGA. TEM images indicate the successful incorporation of silver nanoparticles ranging from 5 to 10ˋnm in size and spherical in shape with a narrow size distribution. These developed SNCHs were used to study the antibacterial activity by inhibition zone method against gram-positive and gram-negative bacteria such as Bacillus and Escherichia coli. The results indicated that these SNCHs can be used potentially for biomedical applications. 1. Introduction Hydrogels have three-dimensional polymeric networks that are fabricated from polymers stabilized through physical or chemical crosslinking. They absorb large quantities of water without losing their structural integrity [1]. Since they mimic body tissues and respond to external stimuli, they are made important and promising forms of biomaterials for various applications including tissue engineering, controlled drug release devices, biosensors, and mechanical actuators [2每4]. Due to the presence of water solubilizing groups, such as 每OH, 每COOH, 每CONH2, 每CONH每, and 每SO3H, these hydrogels show higher hydrophilicity. The three-dimensional network of hydrogel provides relative stability to its structure. Their swollen state results from a balance between the dispersing forces acting on hydrated chains and cohesive forces that do not prevent the penetration of water through the network [5]. Based on these properties the hydrogels have been used recently as templates for production of metallic nanoparticles. Hence the design and development of metal nanoparticles dispersed in polymer matrix have attracted potential applications in various fields like electrical, optical, or mechanical properties [6, 7] making them valuable for applications in areas like optics [8], photo imaging and patterning [9], electronic devices [10], sensors and biosensors [11每13], catalysis [14, 15], and antibacterial and antimicrobial coatings [16]. Silver
%U http://www.hindawi.com/journals/ijcc/2013/539636/