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Biopolymers and Bioplastics 2016
September 12-14, 2016
Volume 7, Issue 5(Suppl) J Bioremed Biodeg 2016
ISSN: 2155-6199 JBRBD, an open access journal
conferenceseries .com
September 12-14, 2016 San Antonio, USA
3rd International Conference and Exhibition onBiopolymers & Bioplastics
Zhen Hua Gao et al., J Bioremed Biodeg 2016, 7:5(Suppl)
Thermal treatment of soybean protein and its effects on the water resistance of soybean protein adhesive
Zhen Hua Gao, Binghang Zhang and Bo Fan
Northeast Forestry University, China
S oy protein isolate is an abundant and renewable industrial crop product that can be an environmental friendly and
sustainable alternative to petrochemicals for producing wood adhesives by eliminating its inherent defects such as poor
water resistance. In this study, a novel method to improve water resistance of soybean protein was proposed by the thermal
treatment in the presence of Na2SO3 and SDS; based on investigations of the effects of thermal treatment temperature, Na2SO 3,
SDS and their combination on the water resistance of protein using FTIR, XRD, TGA and SEM. Partial soybean protein
formed stable three-dimensional network during the thermal treatment via the re-polymerization and the rearrangement
of soybean protein molecules, which improved the water resistance of soybean protein as confirmed by the increased water
insoluble content and hydrothermal-aged wet bond strength. Attributing to the capacities of Na2SO3 to cleave disulfide bonds
and SDS to destroy the hydrophobic interactions of proteins, their combination during thermal treatment released the active
groups buried within the globular structure of soybean protein via partial unfolding. This not only further promotes the re-
polymerizations of soybean protein molecules but also yield more active sites for crosslinking by post-added crosslinker. This
resulted in higher water insoluble content and hydrothermal-aged bond strength compared with the thermal treated soybean
protein without Na2SO3 and SDS. The optimal levels of Na2SO3 and SDS during thermal treatment were all 1 wt%, producing
a modified soybean protein with the best water resistance that can be used to prepare a wood adhesive for structural-use
plywood according to JIS K6806-2003 commercial standard.
Biography
Zhen Hua Gao completed his PhD from Northeast Forestry University and Post-doctoral studies from Wood Composite Department of Forintek Canada Corp in
Canada. He is a Professor at College of Material Science and Engineering, Northeast Forestry University in China. He has published more than 40 papers in
reputed journals. One article published in Pigment & Resin Technology has been chosen as an Outstanding Paper at the Literati Network Awards for Excellence
2008. His five invention patents were authorized. He has finished more than 10 projects as leader so far.