Influence of using native starch through modification with α-amylase enzyme for surface paper sizing as an alternative to oxidized starch

Document Type : Research Paper

Authors

1 Wood and Paper Industries, Faculty of Natural Resources, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran.

2 Department of Cellulose Technology Engineering, Natural resources faculty, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran

Abstract

This study aimed to the native starch modification with α-amylase enzyme and compare it with oxidized starch for surface sizing of paper. Native starch was prepared under different temperature and time conditions by addition of alpha-amylase enzyme to achieve viscosity proportional to oxide starch for base paper surface sizing. Then, the basic industrial paper was subjected to surface sizing by immersion with enzymatic starch and oxidized starch prepared. The papers physical and mechanical properties were measured and evaluated after drying. Based on the results of this study, oxidized starch viscosity at a concentration of 5 % at 95 °C reached 17.51 cp during preparation and to achieve this amount of enzymatic starch viscosity, native starch was prepared at 85 °C using 0.005 % enzyme. The results also showed starch modification with the enzyme by varying the temperature, cooking duration, and concentration of the enzyme and native starch, it is possible to achieve a spectrum of viscosity. Evaluation of the physical and mechanical properties showed greater improvement in paper properties including indices of transverse and longitudinal tensile strength (20% and 30% respectively), transverse and longitudinal tear strength (7% and 15% respectively), burst strength (15%), CMT (7%), and RCT (30%) using enzymatic modified starch compared to oxidized starch for surface sizing. In general, the use of α-amylase enzyme in comparison with oxidized starch enables the economical preparation of starch with a spectrum of viscosity for different conditions for a certain improvement in paper properties can be considered for industrial application.

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References

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Iranian Journal of Wood and Paper Industries
Volume 11, Issue 3
December 2020
Pages 433-443

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