title: Calcium chloride effects on the glass transition of condensed systems of potato starch.
abstract: The effect of calcium chloride on the structural properties of condensed potato starch undergoing a thermally induced glass transition has been studied using dynamic mechanical analysis and modulated differential scanning calorimetry. Extensive starch gelatinisation was obtained by hot pressing at 120°C for 7 min producing materials that covered a range of moisture contents from 3.7% w/w (11% relative humidity) to 18.8% w/w (75% relative humidity). FTIR, ESEM and WAXD were also performed in order to elucidate the manner by which salt addition affects the molecular interactions and morphology of condensed starch. Experimental protocol ensured the development of amorphous matrices that exhibited thermally reversible glassy consistency. Both moisture content and addition of calcium chloride affected the mechanical strength and glass transition temperature of polymeric systems. Highly reactive calcium ions form a direct interaction with starch to alter considerably its structural properties via an anti-plasticizing effect, as compared to the polymer-water matrix.
authors.affiliation: School of Applied Sciences, RMIT University, City Campus, Melbourne, Vic 3001, Australia.
authors.forename: Lillian
authors.initials: L
authors.lastname: Chuang
authors.affiliation: School of Applied Sciences, RMIT University, City Campus, Melbourne, Vic 3001, Australia.
authors.forename: Naksit
authors.initials: N
authors.lastname: Panyoyai
authors.affiliation: School of Applied Sciences, RMIT University, City Campus, Melbourne, Vic 3001, Australia.
authors.forename: Lita
authors.initials: L
authors.lastname: Katopo
authors.affiliation: School of Applied Sciences, RMIT University, City Campus, Melbourne, Vic 3001, Australia.
authors.forename: Robert
authors.initials: R
authors.lastname: Shanks
authors.affiliation: School of Applied Sciences, RMIT University, City Campus, Melbourne, Vic 3001, Australia. Electronic address: stefan.kasapis@rmit.edu.au.
authors.forename: Stefan
authors.initials: S
authors.lastname: Kasapis
mesh_terms: D002122:Calcium Chloride / Q000737:chemistry*; D010968:Plasticizers; D011198:Solanum tuberosum / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*
chemical_list: D010968:Plasticizers; D013213:Starch; D002122:Calcium Chloride
keywords: Anti-plasticizing effect; Calcium chloride; Glass transition; High-solid systems; Potato starch