Extrusion Processing of Wheat Gluten Bioplastic: Effect of the Addition of Kraft Lignin
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Publication Details
Author list: Chantapet P., Kunanopparat T., Menut P., Siriwattanayotin S.
Publisher: Springer
Publication year: 2013
Journal: Journal of polymers and the environment (1566-2543)
Volume number: 21
Issue number: 3
Start page: 864
End page: 873
Number of pages: 10
ISSN: 1566-2543
eISSN: 1572-8900
Languages: English-Great Britain (EN-GB)
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Abstract
Plasticized wheat gluten (WG) was extruded with 0-50 wt% Kraft lignin (KL) contents using a co-rotating twin screw extruder with circular die. The objective of this study was to evaluate the effect of KL on the extrusion processing, and on the resulting properties of those new materials. The addition of either 30 or 50 wt% KL which is a radical scavenger allowed increasing the extrusion die temperature from 80 to 110 ฐC. Moreover, the addition of 10-50 wt% KL contents improved the processability of WG in extrusion: it decreased both die pressure and residence time for all studied feed rates and screw speeds. The addition of KL induced a protein depolymerization and the association between KL and WG as evidenced by the co-elution of KL and WG in SE-HPLC. Moreover, the addition of 10-30 wt% KL improved mechanical properties and reduced the water absorption of WG-based material. ฉ 2012 Springer Science+Business Media New York.
Keywords
Extrusion, Free radical scavenger, Wheat gluten
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