Abstract
Facile and environmentally friendly method of the preparation of silver and gold nanoparticles embedded in potato starch matrix (Sp) was developed. UVVIS spectroscopy, transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectra confirmed formation of ball shaped Ag and Au nanoparticles situated within the polysaccharide template. EDS spectra confirm presence of silver and gold nanocrystals in the obtained composites. Differential scanning calorimetry (DSC) showed that Sp/Au composite started to decompose earlier. The decomposition is slower and two-step, in contrast to Sp and Sp/Ag. NanoAg accelerates carbonization. Molecular weights of polysaccharide chains of the matrix were estimated with the size exclusion chromatography coupled with multiangle laser light scattering and refractometric detectors (HPSEC-MALLS-RI). Formation of nanosilver containing composites led to partial depolymerisation of polysaccharides from the amylose fraction. In the case of nanogold we observed depolymerisation of polysaccharide chains from both fractions.
Highlights
For a wide spectrum of amazing properties metal nanoparticles received much attention in a variety of areas including physics, chemistry, materials science, and biomedical science [1]
This paper presents preparation and characteristics of potato starch foils with embedded silver and gold nanoparticles generated from AgNO3 and HAuCl4, reduced with NaBH4
Typical transmission electron microscopy (TEM) images of silver (A) and gold (B) nanoparticles embedded in the starch matrix are displayed on Figure 2
Summary
For a wide spectrum of amazing properties metal nanoparticles received much attention in a variety of areas including physics, chemistry, materials science, and biomedical science [1] They are frequently used either in form of diluted solutions ready for application in form of sprays or ready to use suspensions, for instance, in glass or cosmetics. Since the matrix for these nanoparticles is biodegradable there should be a chance for controlled prolonged distribution of minute but significant concentration of nanoparticles suitable for their application as bactericidals [3]-[5] [8]-[10], fungicides [11] and catalysts [12]-[16] For their provenience polysaccharides received attention as biodegradable environmentally benign materials of numerous applications, for instance, as packaging foils, encapsulating material, wound dressing and nanometal carriers [17]-[24]. When polysaccharides did not contain such groups and did not dispose with sufficiently strong reducing properties, additional complexing agents such as thiolate, boronic acid, had been applied [24]
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