Characterisation and cooperative antimicrobial properties of chitosan/nano-ZnO composite nanofibrous membranes

Applications of chitosan powder with in situ synthesized nano ZnO particles as an antimicrobial agent

“…The inherent anti microbial activity of chitosan was explained by its ability 21 to attach the negatively charged cell membrane of microbes using its positively charged 22 amino groups. The presence of nanoparticles in chitosan matrix is expected to promote this 23 columbic interaction with outer cell wall of microorganisms and leads to increased anti 24 microbial activity [26].…”

“…The presence of 4 any clear zone that formed around the disc on the plate medium was recorded as an indication 5 of inhibition against the microbial species. formation of composites, the strong bands corresponding to -NH 2 , and -OH are found to be 21 shifted to lower regions (3387 cm -1 ). Similarly, the peak corresponding to C=O group is 22 found to be shifted to a lower wave number (1633 cm -1 ) and the peak observed 1468 cm -1 is 4 The XRD was used to examine the crystalline state of chitosan and chitosan-ZnO 5 composites (shown in Fig.…”

“…The solution was then filtered to remove undissolved particles 18 and added 30 mL of 15 % zinc acetate dihydrate solution and shaken well. To this solution, 19 30 mL of 45 % sodium hydroxide solution was added slowly at a temperature of 70 0 C and 20 the entire mixture was stirred at 70 0 C for 4 h. The white precipitate formed was allowed to 21 settle by keeping the mixture for 24 h. The supernatant solution was discarded, the precipitate 22 was rinsed with distilled water for several times to remove excess of NaOH present (if any), 23 filtered and dried by keeping in an air oven maintained at a temperature of 50 0 C for 12 h. The 24 white dried precipitate was powdered well in a mortar by using a pestle and this sample was A c c e p t e d M a n u s c r i p t 5 designated as CN45. The above process was repeated with decreased concentration of sodium 1 hydroxide, 30 and 15%, the corresponding composites formed were designated as CN30 and 2 CN15 respectively.…”

Core–sheath nanofibrous membranes based on poly(acrylonitrile‐butadiene‐styrene), polyacrylonitrile, and zinc oxide nanoparticles for photoreduction of Cr(VI) ions in aqueous solutions

“…1 Concerning the strategies for the purification of water contaminated with heavy metals, the use of systems based on polymer membranes has been extensively preferred due to suitable mechanical performance that these materials provide for highpressure processes and their versatility of thermal and chemical properties. [18][19][20][21][22][23][24] Three main approaches for fabricating polymer/ZnO fibrous membranes have been explored: (1) electrospinning of a polymer solution containing ZnO nanoparticles, 22,[25][26][27][28] (2) deposition of ZnO nanoparticles onto electrospun membranes by several methods, namely, impregnation, electrospraying, or similar techniques, [29][30][31][32][33][34][35] and in a minor extent (3) coaxial electrospinning. [2][3][4] In this context, electrohydrodynamic techniques provide excellent approaches for the design of nanofibrous polymeric membranes with tailored morphology.…”

Electrospinning and electrospraying techniques for designing novel antibacterial poly(3-hydroxybutyrate)/zinc oxide nanofibrous composites

“…Similar results related to antibacterial activity and tissue proliferation were obtained by Shalumon et al [22] for electrospun biocomposites derived from solutions consisting of poly(vinyl alcohol) (PVA), sodium alginate, and dispersed ZnO particles (160 nm in size). Alternately, Wang et al [23] designed a hybrid mat based on chitosan which has an inherent antibacterial activity with PVA and ZnO nanoparticles. The formation of a chitosan-Zn complex drastically diminished the proliferation of both Candida albicans and E. coli.…”