The F. oxysporum strain used was 07 SD from
ESALQ-USP Genetic and Molecular Biology Laboratory-
Piracicaba, S.P., Brazil. The fungal inoculum was prepared
in 2% malt extract and 0.5% yeast extract at 28 C in
Petri dishes.The liquid fungal growth was carried out
in the presence of 0.5% yeast extract at 28 C for 6
days.The biomass was filtrated and resuspended in sterile
water.The biosynthesis of silver nanoparticles was
carried out as following: approximately 10 g of F. oxysporum
biomass was taken in a conical flask containing
100 ml of distilled water, kept for 72 h at 28 C and
then the aqueous solution components were separated by
filtration.In this solution (fungal filtrate) AgNO3 (10−3
M) was added and the system was kept for several hours
at 28 C.Periodically , aliquots of the reaction solution
were removed and the absorption was measured in a
UV-Vis spectrophotometer (Agilent 8453—diode array) at
440 nm.The silver nanoparticles were characterized by
Transmission Electron Microscopy (TEM) and Elemental
Spectroscopy Imaging (ESI).Bright field images and
the elemental distribution within silver nanoparticles were
obtained using a Carl Zeiss CEM-902 transmission electron
microscope (80 KeV), equipped with a Castaing-
Henry-Ottensmeyer energy filter spectrometer within the
column.F or the examination of the silver particle, one
drop of the particle dispersion was deposited on carboncoated
parlodion films supported in 300 mesh copper grids
(Ted Pella).
Elemental images were obtained for the relevant elements
found in this sample, using monochromatic electrons
corresponding to the silver K-edge, sulfur L2 3-edge,
and nitrogen L3-edge.The energy-selecting slit was set at
367 ± 6 keV for Ag, 165 ± 6 eV for S, and 400 ± 6 eV
for N.The images were recorded by a Proscan high-speed
slow-scan CCD camera and processed in the AnalySis 3.0
system.
The size of silver nanoparticles was measured by X-Ray
Diffraction (XRD, model XD3A from Shimadzu) with
nickel-filtered Cu-K radiation (40 KV, 30 mA) at an
angle of 2 from 5 to 50.The scan speed was 0.02/min
204 J. Biomed. Nanotechnol. 3, 203–208, 2007
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Durán et al. Antibacterial Effect of Silver Nanoparticles Produced by Fungal Process on Textile Fabrics
and the time constant was 2 s.The size was calculated
through of the Scherrer’s equation:
D = K/
cor cos with
cor
=
2
sample
−
2
ref 1/2
where D is the average crystal size, K is the Scherrer coefficient
(0.89), is the X-ray wavelength ( = 1542 Å),
Bragg’s angle (2 = 251),
cor the corrected of the full
width at half-maximum (FWHM) in radians, and
sample
and
ref are the FWHM of the reference and sample peaks,
respectively.21
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