Evaluation of the starch films containing cellulose and lignocellulose for food packaging

Document Type : Research Paper

Authors

1 Ph.D. Graduate, Pulp and paper technology, Gorgan university of agricultural sciences & natural resources, Gorgan, Iran

2 Associate prof., Pulp and paper technology, Gorgan university of agricultural sciences & natural resources, Gorgan, Iran

3 Assistant prof.,wood composites products, Gorgan university of agricultural sciences & natural resources, Gorgan, Iran

Abstract

The objective of this study was to prepare and evaluate the features of starch films containing cellulose nanofibres (CNF) and lignocellulose nanofibres (LCNF) derived from old corrugated container (OCC) by mechanical method and using super disk grinding to achieve optimal strength, solubility and biodegradability features for food packaging. The characteristics of CNF and LCNF including morphological features (diameter and its distribution) were investigated using field emission scanning electron microscopy (FE-SEM). The studied films based on starch content of 5, 10 and 15% of CNF and LCNF as reinforcement agent were prepared using solution casting method. The effects of CNF and LCNF on physical and mechanical properties, weak acid and alkali, as well as biodegradation of films under aerobic conditions (using soil) were investigated. The result showed that average diameter of LCNF and CNF obtained was 69±10 µm and 28±10 nm, respectively. The results of physical and barrier properties showed that increasing the percentage of CNF and LCNF reduced the oil absorbing. By increasing the percentage of CNF, the solubility in water, acid, and alkali films decreases slightly, but this trend was reversed for LCNF. The results of mechanical strength showed that the increase in the contribution of CNF improved strengths to burst and tear index in the films, but the improvement for the film containing LCNF was less than that of CNF film. The biodegradation process of starch film samples increased by increasing the percentage of CNF and LCNF by 20-15%. It can be concluded that the use of CNF and LCNF leads to increased mechanical strength and decreased solubility to various solvents (water, acid and alkali). Also, with using CNF and LCNF, the biodegradability features were improved and as a result, it became more practical.

Keywords

Main Subjects

References

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Iranian Journal of Wood and Paper Industries
Volume 10, Issue 1
May 2019
Pages 35-47

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