Effect of homogenization stirring speed on mechanical and water barrier properties of gallic acid treated zein-oleic acid composite films

Abstract The effect of using four plasticizers namely ethylene glycol, propylene glycol, glycerol and sorbitol on mechanical and water barrier properties of transglutaminase cross-linked zein–oleic acid composite films was investigated. Results revealed that both mechanical and water barrier properties of the films were significantly affected (p<0.05) by plasticizer type. Tensile strength (TS), water vapour permeability (WVP) and solubility (SB) values were all better in ethylene glycol control plasticized films compared to other plasticizers. Furthermore, irrespective of plasticizer type, transglutaminase treatment improved TS while when oleic acid was incorporated into the films in the range of 1–4% based on zein weight, the mechanical and water barrier properties of the composite film were diversely affected. Results from scanning electron microscopy for the 2% oleic acid-incorporated composite films revealed a rough and irregular surface morphology for the sorbitol plasticized films. Overall, ethylene glycol provided better mechanical and water barrier properties.

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Effect of drying temperature and pH alteration on mechanical and water barrier properties of transglutaminase cross linked zein–oleic acid composite films

LWT ◽

10.1016/j.lwt.2015.08.030 ◽

2016 ◽

Vol 65 ◽

pp. 518-531 ◽

Cited By ~ 5

Author(s):

Kingsley Masamba ◽

Yue Li ◽

Joseph Hategekimana ◽

Jianguo Ma ◽

Fang Zhong

Keyword(s):

Oleic Acid ◽

Composite Films ◽

Barrier Properties ◽

Drying Temperature ◽

Water Barrier

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Mechanical and Water Barrier Properties of Zein–Corn Starch Composite Films as Affected by Gallic Acid Treatment

International Journal of Food Engineering ◽

10.1515/ijfe-2016-0112 ◽

2016 ◽

Vol 12 (8) ◽

pp. 773-781 ◽

Cited By ~ 1

Author(s):

Kingsley Masamba ◽

Yue Li ◽

Hafiz Rizwan Sharif ◽

Jianguo Ma ◽

Fang Zhong

Keyword(s):

Composite Film ◽

Gallic Acid ◽

Acid Treatment ◽

Corn Starch ◽

Composite Films ◽

Water Vapor Permeability ◽

Barrier Properties ◽

Vapor Permeability ◽

Water Barrier ◽

Film Forming

Abstract The effect of gallic acid treatment on mechanical and water barrier properties in zein and zein–corn starch composite films was investigated. Four concentrations of corn starch (5 %, 10 %, 15 %, 20 %) were used in composite films making a final solid concentration of 6 % (w/v) in the film forming solution. One composite film containing 10 % corn starch was also prepared in absence of gallic acid for comparison purpose. Gallic acid treatment improved tensile strength (TS) and water vapor permeability (WVP) while solubility was increased in control zein films. On the other hand, gallic acid treatment significantly (p < 0.05) reduced TS and increased WVP in zein–corn starch composite films. Interestingly, mechanical and water barrier properties of composite films prepared in absence of gallic acid were comparatively better than gallic acid treated composite films. These findings provided useful insights in how each individual hydrocolloid in the composite film was differently affected by gallic acid treatment.

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