Development of nanosensors and nanostructured materials from agricultrural by-products for enhancement of food and agricultrural productivity and for environmental sensing and remediation: Performance analysis of nanosilica powder from rice hull ash for use in vario us agricultural applications: Characterization and performance analysis of nanosilica powder incorporated in biodegradable film based on cassava starch for food packaging applications

Date

2014

Abstract

The use of biological films in food packaging application has drawn the attention of researchers as an alternative way to deal with the problem of waste packaging disposal. To be effective as food packaging material, biological films should have good mechanical and barrier properties. Today, researches on biological films for food packaging focus on improving these properties to make them comparable to commonly used plastic packaging materials. Nanomaterials are attracting a great deal of attention due to new potential uses of materials in nanometer scale. The modification of the biodegradable film through nanotechnology could be an effective way in improving the properties of the films. Silica particles were successfully produced from rice hull (7-13 nm particle) and rice hull ash (35-90 nm particle) using the hydrothermal method and the solgel method, respectively. The hydrothermal method which involves acid leaching and calcination at 650 deg C for 6.5 hours is a more economical and efficient way of producing quality nanosilica. A combustor was also fabricated for the production of white rice hull ash. Thermoplastic starch formulations were prepared by mixing glutaraldehyde-crosslinked cassava starch, glycerol as plasticizer and nanosilica. Different additives like PVA-CMC and plasticizers like monolaurin and citric acid were also tried. The addition of nanosilica in some formulations showed improvement in tensie strength and water resistance. The films did not disintegrate in water when incorporated with nanosilica. Modification of starch using acetic anhydride and butyric anhydride was done to improve these properties. The degrees of substitution are 2.7 for starch acetate and 2.1 for starch butyrate. Modifying starch made it hydrophobic. The maximum water uptake significantly decreased to 30% for starch acetate and 20% for starch butyrate.

Language

English

Document Type

Article

Pages /Collation

73 leaves

En – AGROVOC descriptors

RICE HUSKS; CASSAVA; STARCH; EDIBLE FILMS; PACKAGING; PACKAGING MATERIALS; WASTE DISPOSAL; WASTE UTILIZATION

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