title: Properties and characteristics of dual-modified rice starch based biodegradable films.
abstract: In this study, the dual-modified rice starch was hydroxypropylated with 6-12% of propylene oxide followed by crosslinking with 2% sodium trimetaphosphate (STMP) and a mixture of 2% STMP and 5% sodium tripolyphosphate (STPP). Increasing the propylene oxide concentrations in the DMRS yielded an increase in the molar substitution (MS) and degree of substitution (DS). However, the gelatinization parameters, paste properties, gel strength and paste clarity showed an inverse trend. The biodegradable films from the DMRS showed an increase the tensile strength, elongation at break and film solubility, while the transparency value decreased when the concentration of propylene oxide increased. However the water vapor permeability of the films did not significantly change with an increase in the concentration of propylene oxide. In addition, it was found that DMRS films crosslinked with 2% STMP demonstrated higher tensile strength, transparency value and lower water vapor permeability than the DMRS films crosslinked with a mixture of 2% STMP and 5% STPP. The XRD analysis of the DMRS films showed a decrease in crystallinity when the propylene oxide concentrations increased and the crystallinity of DMRS films with 2% STMP were higher than the DMRS films with a mixture of 2% STMP and 5% STPP.
authors.affiliation: Department of Material Product Technology, Faculty of Agro-Industry, Prince of Songkla University, 15 Kanjanawanich, Khor Hong, Hat Yai 90112, Songkla, Thailand. Electronic address: thawean.b@psu.ac.th.
authors.forename: Thewika
authors.initials: T
authors.lastname: Woggum
authors.affiliation: Department of Food Technology, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai 90112, Songkhla, Thailand.
authors.forename: Piyarat
authors.initials: P
authors.lastname: Sirivongpaisal
authors.affiliation: Department of Material Product Technology, Faculty of Agro-Industry, Prince of Songkla University, 15 Kanjanawanich, Khor Hong, Hat Yai 90112, Songkla, Thailand.
authors.forename: Thawien
authors.initials: T
authors.lastname: Wittaya
mesh_terms: D063566:Biodegradable Plastics / Q000138:chemical synthesis / Q000737:chemistry*; D004852:Epoxy Compounds / Q000737:chemistry; D018857:Food Packaging; D005780:Gelatin / Q000737:chemistry; D006801:Humans; D012275:Oryza; D010539:Permeability / Q000187:drug effects; D011122:Polyphosphates / Q000737:chemistry; D013213:Starch / Q000138:chemical synthesis / Q000737:chemistry*; D013718:Tensile Strength; D014867:Water / Q000737:chemistry
chemical_list: D063566:Biodegradable Plastics; D004852:Epoxy Compounds; D011122:Polyphosphates; D014867:Water; D005780:Gelatin; D013213:Starch; C005692:triphosphoric acid; C009068:propylene oxide
keywords: Biodegradable film; Dual-modified rice starch; Mechanical properties; Rice starch