Siriphannon, Punnama
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Preferred name
Siriphannon, Punnama
Alternative Name
Siriphannon, P.
Main Affiliation
Email
punnama.si@kmitl.ac.th
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Item type:Publication, Facile synthesis of chitosan/CuO nanocomposites for potential use as biocontrol agents(2018-06-01); Iamphaojeen, Y.Chitosan/CuO nanocomposites (Chi/CuO) were prepared by facile and eco-friendly technique. The 2%w/v chitosan solution was mixed with 0.5 %w/w sodium tripolyphosphate (STPP), resulting in the formation of ionically crosslinked chitosan. The crosslinked chitosan was soaked in an aqueous solution containing 0.001, 0.01 or 0.1 mol/L CuSO<inf>4</inf>•5H<inf>2</inf>O for 24 hrs, in which the Cu<sup>2+</sup> ions were absorbed into the chitosan network, forming as the chitosan/Cu<sup>2+</sup> precursors. The chitosan/Cu<sup>2+</sup> precursors were hydrothermally reacted in two different basic media, i.e. NaOH and NH<inf>4</inf>OH, at 100°C for 24 hrs, resulting in the nano-sized CuO crystals hydrothermally grew and embedded in the crosslinked chitosan matrix. The CuO grown in the NaOH possessed larger crystallite size and higher crystallinity than that in the NH<inf>4</inf>OH. In addition, the CuO crystallite size in the nanocomposites increased with the increase of initial concentration of Cu<sup>2+</sup> starting agent due to the increase of Cu<sup>2+</sup> quantity in the chitosan/Cu<sup>2+</sup> precursors. The chitosan/CuO nanocomposites prepared by using 0.01 and 0.1 mol/L Cu<sup>2+</sup> could exhibit the antibacterial activities after intimate contact with Staphylococcus aureus and Escherichia coli under JIS L 1902:1998 (Qualitative) test method, indicating their potential use as biocontrol agents.