Premium
Preparation and partial characterization of films made with dual‐modified (acetylation and crosslinking) potato starch
Author(s) -
GonzálezSoto Rosalía A,
NúñezSantiago María C,
BelloPérez Luis A
Publication year - 2019
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.9528
Subject(s) - starch , crystallinity , amylopectin , solubility , chemical modification , modified starch , chemical engineering , ultimate tensile strength , polymer chemistry , materials science , chemistry , acetylation , swelling , potato starch , organic chemistry , amylose , composite material , biochemistry , engineering , gene
Background Starch is an alternative material for the production of biodegradable plastics; however, native starches have drawbacks due to their hydrophilic nature. Chemical modifications such as acetylation and crosslinking are used to broaden the potential end‐uses of starch. Dual modification of starches increases their functionality compared to that of starches with similar single modifications. In this study, a dual‐modified potato starch (acetylated and crosslinked) was used to produce films by casting. Results Changes in the arrangement of the amylopectin double helices of dual‐modified starch were evident from X‐ray diffraction patterns, pasting profiles and thermal properties. The degree of substitution for acetyl groups was low (0.058 ± 0.006) because crosslinking dominated acetylation. Modified starch film had higher elongation percentage (82.81%) than its native counterpart (57.4%), but lower tensile strength (3.51 MPa for native and 2.17 MPa for dual‐modified) and lower crystallinity in fresh and stored films. The sorption isotherms indicated that the dual modification decreased the number of reactive sites for binding water, resulting in a reduction in the monolayer value and a decrease in the solubility and water vapor permeability. Conclusions Dual modification of starch may be a feasible option for improving the properties of biodegradable starch films. © 2018 Society of Chemical Industry