Effects of starches and plasticizers on starch-based film properties

Name: Hoang Phuong Nguyen Vu

LCSH: Kasetsart University -- Theses. M.S. (Packaging Technology) 2016

Classification :.LCCS: TS198.3.F5

LCSH: Kasetsart University. Department of Packaging and Materials Technology -- Theses

LCSH: Plasticizers

LCSH: Plastic films

LCSH: Starch -- Utilization

LCSH: Containers

Abstract: This thesis studies the effects of starch types and plasticizers on the properties of starch edible film from cassava (cs), mungbean (mb), and a mixture of both starches (csmb) with different amylose content. The solution-cast starch films were plasticized using glycerol or sorbitol (33% w/w, db). All plasticized starch films whose thickness ranged from 0.092 mm to 0.113 mm were homogeneous and flexible. The highest moisture content of sorbitol-plasticized films and glycerol-plasticized films was 12% and 20%, respectively. Glycerol-plasticized films exhibited higher extensibility and water permeability, but lower tensile stress (TS) and oxygen permeability. In addition, the order of TS of plasticized starch films was mb > csmb > cs. The plasticized starch films displayed two -relaxations, which were plasticizer-rich phase (Tg1) of glycerol (-58.5 °C) or sorbitol (-17.7 °C), as well as starch rich phase (Tg2) ranged from -0.4 to 15.33 °C. The melting temperature (Tm) of the sorbitol-plasticized films and the glycerol-plasticized films were 169 °C and 164 °C, respectively. The degradation temperature (Td) of the csmb and mb films was ~4-7 °C, which is significantly higher than that of cs films. The XRD patterns of the glycerol-plasticized cs films showed only V-type (2θ = 19 ), whereas those of other films were B and V-types (2θ = 17°, 19° and 23°). The HPSEC results indicated the amylose content of cs films was low (21%), whereas that of mb films was high (33%). The FTIR spectra suggested that types of plasticizers, moisture content, and types of starch resulted in different inter and intra-molecular interactions of plasticized-starch films.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Namfone Lumdubwong

Role: Thesis Advisor

Name: Tunyarut Jinkarn

Role: Thesis Co-Advisor

Name: Kanokrat Limpisophon

Role: Thesis Co-Advisor

Created: 2016

Modified: 2023-06-15

Issued: 2023-06-15

วิทยานิพนธ์/Thesis

application/pdf

URL: https://kasetsart.idm.oclc.org/login?url=https://www.lib.ku.ac.th/KUthesis/2559/hoang-phu-all.pdf

CallNumber: TS198.3.F5.V84

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Packaging Technology

Grantor: Kasetsart University

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