پديد آورندگان :
Velmurugan Natarajan نويسنده , Kumar G Gnana نويسنده , Sub Han Sang نويسنده , Nahm Kee Suk نويسنده , Soo Lee Yang نويسنده
چكيده لاتين :
Silver nano-sized particles were synthesized with strong antifungal activity against
the wood staining fungi Ophiostoma flexuosum, O. tetropii, O. polonicum and O.
ips. The average size and purity of the nano-sized particles were determined by
scanning electron microscopy and XRD spectra, respectively. The structural characterizations
of nano-sized particles were performed using IR spectrum and EDS. Radial
diffusion method was carried out to reveal the antifungal activity of silver nano-sized
particles on MEA agar plates. Strong fungicidal silver nano-sized particles were mixed
with chitosan solution and then the chitosan membrane was prepared by solvent
evaporation method. Glutaraldehyde was used as cross-linking agent for membrane
preparation. Deacetylation degree, concentration and pH of chitosan were considered
as a main factor for preparation of bioactive membrane. The quality and structure of
membranes were analyzed by Fourier transform infrared spectroscopy. Thermostability
of the membranes was confirmed by thermogravimetric analysis. Synthesized
chitosan-glutaraldehyde-Ag membrane was tested against the wood staining fungi
on MEA agar plates using inhibition zone method. The results showed that the antifungal
activity of chitosan membrane increased with increasing in concentration of silver
nano-sized particles. According to our results, synthesized chitosan membrane has
been used as a good carrier for silver nano-sized particles in wood industries and these
materials could be very efficient substitutions for chemical preservatives currently used
to control fungal contamination in wood industries.
