Hydrothermal synthesis of bacterial cellulose–copper oxide nanocomposites and evaluation of their antimicrobial activity

Made available in DSpace on 2018-11-26T17:42:24Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-01-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) In this work, for the first time bacterial cellulose (BC) hydrogel membranes were used for the fabrication of antimicrobial cellulosic nanocomposites by hydrothermal deposition of Cu derivative nanoparticles (i.e. Cu(0) and CuxOy species). BC-Cu nanocomposites were characterized by FTIR, SEM, AFM, XRD and TGA, to study the effect of hydrothermal processing time on the final physicochemical properties of final products. XRD result show that depending on heating time (3-48 h), different CuxOy phases were achieved. SEM and AFM analyses unveil the presence of the Cu(0) and copper CuxOy nanoparticles over BC fibrils while the surface of 3D network became more compact and smother for longer heating times. Furthermore, the increase of heating time placed deleterious effect on the structure of BC network leading to decrease of BC crystallinity as well as of the on-set degradation temperature. Notwithstanding, BC-Cu nanocomposites showed excellent antimicrobial activity against E. coli, S. aureus and Salmonella bacteria suggesting potential applications as bactericidal films. Univ Fed Piaui, Dept Quim, Campus Minist Petronio Portela, BR-64049550 Teresina, PI, Brazil Univ Estadual Paulista, Inst Quim Araraquara, Dept Quim Geral & Inorgan, Rua Prof Francisco Degni,55, BR-14800060 Araraquara, SP, Brazil Centro Univ Araraquara, Lab Biopolimeros & Biomat BIOPOLMAT, Rua Carlos Gomes,1217, BR-14801320 Araraquara, SP, Brazil Univ Basque Country UPV EHU, Dpto Ingn Quim & Medio Ambiente, Escuela Politecn Donostia San Sebastian, Pza Europa 1, Donostia San Sebastian 20018, Spain Univ Luterana Brasil, Programa Posgrad Genet & Toxicol Aplicada, Ave Farroupilha,8001,Predio 01, BR-92450900 Canoas, RS, Brazil Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil Univ Estadual Paulista, Inst Quim Araraquara, Dept Quim Geral & Inorgan, Rua Prof Francisco Degni,55, BR-14800060 Araraquara, SP, Brazil FAPESP: 2015/ 09833-0 FAPESP: 2016/06612-6