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Incorporation of Selected Antimicrobial Small Molecule Compounds into Tapioca Starch and the Effects on Thickness, Moisture, and Oxygen Mass Transfer, and Mechanical Properties of the Films
Author(s) -
Wan Zilu,
Rajashekara Gireesh,
Fuchs James,
Carcache de Blanco Esperanza,
Pascall Melvin A.
Publication year - 2018
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.201700060
Subject(s) - crystallinity , glass transition , materials science , moisture , dynamic mechanical analysis , permeation , oxygen , oxygen gas , composite material , chemical engineering , chemistry , organic chemistry , polymer , membrane , engineering , biochemistry
The incorporation of antimicrobial small molecule compounds (JA‐144, TH‐4, and TH‐8) into tapioca starch is investigated as well as their influence on thickness, moisture uptake, gas permeation, morphology, thermal and the mechanical properties of the tapioca films. Unlike TH‐4 and TH‐8, JA‐144 increases in thickness, moisture uptake and gas permeation of the films, when compared with the control film (without antimicrobials). The melt temperature of the control is reduced from 122.63 to 119.84 °C by JA‐144, while TH‐4 and TH‐8 increases them to 126.49 °C and 130.68 °C, respectively. For JA‐144, the X‐ray diffraction show no significant crystallinity change, unlike TH‐4 and TH‐8 that show distinct crystallinity peaks. Dynamic Mechanical Analysis show that JA‐144 has little effect on the glass transition temperature and storage modulus, while TH‐4 and TH‐8 increase storage modulus and the glass transition temperature. Thus, JA‐144 increases flexibility and moisture uptake, but lowers the gas barrier. However, TH‐4 and TH‐8 augment the stiffness and gas barrier properties.