Physicochemical and mechanical properties of bambara groundnut starch films modified with stearic acid.
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Date
2016-10-23
Journal Title
Journal ISSN
Volume Title
Publisher
Institute of Food Technologies, USA.
Abstract
The physicochemical and mechanical properties of biofilm prepared from bambara starch modified with
varying concentrations of stearic acid (0%, 2.5%, 3.5%, 5%, 7%, and 10%) were studied. By scanning electron microscopy, bambara starch films modified with stearic acid (3.5%) showed a progressively rough surface compared to those with 2.5% stearic acid and the control. Fourier transform infrared spectroscopy spectra revealed a peak shift of approximately 31 cm−1, suggesting the promotion of hydrogen bond formation between hydroxyl groups of starch and stearic acid. The addition of 2.5% stearic acid to bambara starch film reduced water vapor permeability by approximately 17%. Bambara starch films modified with higher concentration of stearic acid were more opaque and showed significantly high melting temperatures. However, mechanical properties of starch films were generally negatively affected by stearic acid. Bambara
starch film may be modified with 2.5% stearic acid for improved water vapor permeability and thermal stability with minimal effect on tensile strength
Description
Keywords
Bambara starch, Edible films, Mechanical, Physicochemical, Stearic acid