Antimicrobial and swelling behaviors of novel biodegradable corn starch grafted/poly(4-acrylamidobenzoic acid) copolymers.

Autor: Abd El-Ghany NA; Cairo University, Faculty of Science, Chemistry Department, Giza 12613, Egypt. Electronic address: abdelghanyn@sci.cu.edu.eg., Abdel Aziz MS; Cairo University, Faculty of Science, Chemistry Department, Giza 12613, Egypt., Abdel-Aziz MM; El Azhar University, Regional Center for Mycology and Biotechnology, Egypt., Mahmoud Z; Cairo University, Faculty of Science, Chemistry Department, Giza 12613, Egypt.
Jazyk: angličtina
Zdroj: International journal of biological macromolecules [Int J Biol Macromol] 2019 Aug 01; Vol. 134, pp. 912-920. Date of Electronic Publication: 2019 May 15.
DOI: 10.1016/j.ijbiomac.2019.05.078
Abstrakt: Novel antimicrobial copolymers resulted from free radical copolymerization of gelatinized corn starch in aqueous solution with different amounts of 4-acrylamidobenzoic acid monomer using ammonium persulfate (APS)/sodium bisulfite (NaHSO 3 ) as a redox initiator. The grafting copolymerization was evidenced by FTIR, 1 HNMR, scanning electron microscopy (SEM) and X-ray diffraction. The thermal stability was improved after the grafting reaction as detected from IPDT values calculated from the thermogravimetric analysis. The effect of changing grafting parameters (initiator concentration, monomer concentration, reaction time and temperature) on graft copolymerization were studied by measuring the grafting percentage (%G), grafting efficiency (%GE) and homopolymer percentage (%H). The optimum grafting conditions were determined as follows: Initiator concentration [I] = 3 × 10 -2  mol/L, monomer concentration [M] = 0.25 mol/L, reaction temperature = 65 °C and reaction time = 2 h. The prepared copolymers exhibited swelling ability in both water and 0.9% saline solution. The antimicrobial study revealed a high degree of inhibition against different strains of Gram-positive bacteria, Gram-negative bacteria and fungi when compared with neat starch.
(Copyright © 2019. Published by Elsevier B.V.)
Databáze: MEDLINE
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