Oxidized xanthan gum with different aldehyde content is successfully prepared by periodate oxidization
and used as a crosslinking agent for gelatin edible films. X-ray diffraction measurements and atomic force
microscopy images demonstrate that degradation is concomitant with the oxidization process, leading to
the decrease in crystallinity and the structure changes. Glycerol-plasticized gelatinexanthan gum and
gelatineoxidized xanthan gum edible films are prepared using casting techniques. The optical properties
studies show that all films are very transparent and have excellent barrier properties against UV light.
Introducing aldehyde groups can improve the UV barrier properties, resulting from the increased C]N
groups by Schiff’s base formation. Properties studies show that xanthan gum can drastically reduce the
total soluble matter, moisture content and water vapor permeability and greatly improve the mechanical
properties and thermal stability of gelatin films. With the increase of oxidization level of oxidized
xanthan gum, the enhancement of water barrier properties, mechanical properties and thermal stability
of gelatineoxidized xanthan gum films is observed, which is mainly due to the covalently linking between
the two polymers. Subsequently, the excessive degradation of xanthan gum will reduce the
mechanical properties and thermal stability of gelatin films
Oxidized xanthan gum with different aldehyde content is successfully prepared by periodate oxidizationand used as a crosslinking agent for gelatin edible films. X-ray diffraction measurements and atomic forcemicroscopy images demonstrate that degradation is concomitant with the oxidization process, leading tothe decrease in crystallinity and the structure changes. Glycerol-plasticized gelatinexanthan gum andgelatineoxidized xanthan gum edible films are prepared using casting techniques. The optical propertiesstudies show that all films are very transparent and have excellent barrier properties against UV light.Introducing aldehyde groups can improve the UV barrier properties, resulting from the increased C]Ngroups by Schiff’s base formation. Properties studies show that xanthan gum can drastically reduce thetotal soluble matter, moisture content and water vapor permeability and greatly improve the mechanicalproperties and thermal stability of gelatin films. With the increase of oxidization level of oxidizedxanthan gum, the enhancement of water barrier properties, mechanical properties and thermal stabilityof gelatineoxidized xanthan gum films is observed, which is mainly due to the covalently linking betweenthe two polymers. Subsequently, the excessive degradation of xanthan gum will reduce themechanical properties and thermal stability of gelatin films
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