Physico-Chemical Behavior of Glycerol-Coated Cassava Starch Gels Incorporating Kaolin and Metakaolin

Namory Meite^1, , Léon Koffi Konan^1, , Bi Irie Hervé Goure Doubi², Doudjo Soro³, Iuliana Mihaela Lazar⁴ and Samuel Oyetola¹

¹Laboratory of Materials Inorganic Chemistry, Felix Houphouet Boigny University, 22 Po box 582 Abidjan, Côte d’Ivoire

²Unit for training and research of Biological Sciences, Peleforo Gon Coulibaly University, Po box 1328 Korhogo, Côte d’Ivoire

³Laboratory of Industrial Processes, Synthesis, Environment and New Energies (LAPISEN), National Institute Polytechnic Houphouet Boigny (INP-HB) of Yamoussoukro, BP 1093 Yamoussoukro, Côte d'Ivoire

⁴Department of Environmental and Mechanical Engineering, Vasile Alecsandri University of Bacau, Calea Marasesti 157, 600115, Bacau, Romania

Cite this paper:
Namory Meite, Léon Koffi Konan, Bi Irie Hervé Goure Doubi, Doudjo Soro, Iuliana Mihaela Lazar and Samuel Oyetola. Physico-Chemical Behavior of Glycerol-Coated Cassava Starch Gels Incorporating Kaolin and Metakaolin. American Journal of Materials Science and Engineering. 2019; 7(1):1-6. doi: 10.12691/ajmse-7-1-1

Abstract

This study aims at analyzing the physico-chemical interactions in glycerol-coated cassava starch gels incorporating clay as mineral filler during heating. The physico-chemical and structural characterization of the clay used is composed of 75% kaolinite, 14% quartz and 11% illite. A thermal treatment at 700°C for 1 hour of this kaolinitic clay has allowed strong destructuring of the crystalline structure. The suspensions of glycerol plasticized cassava starch without charge or containing 5% by weight of clay were prepared and then heated at various temperatures between 30°C and 100°C. The suspensions viscosity increases according to the temperature up to a maximum following the penetration of the water molecules inside the starch grains. This phase is followed immediately by a sharp drop in the viscosity, resulting in a granular destructuring and solubilization of the starch grains. The suspensions incorporating metakaolin have a higher viscosity than those incorporating kaolin. The gels incorporating metakaolin have a hight ability to downgrade. The infrared spectroscopy of gels taken at different temperatures show the formation of the inter and intra molecular bonds within the starch granules.

Keywords:
bioplastic starch viscosity metakaolin

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