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Effects of Acid Concentration and the Addition of Copper/Boron Salts on the Efficacy of Okara-based Wood Preservatives  

Jeong, Han-Seob (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University)
Kim, Ho-Yong (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University)
Ahn, Sye-Hee (Division of Life & Environmental Resources, Daegu University)
Choi, In-Gyu (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University)
Oh, Sei-Chang (Division of Life & Environmental Resources, Daegu University)
Han, Gyu-Seong (School of Forest Resources, Chungbuk National University)
Yang, In (Research Institute for Agriculture and Life Sciences, Seoul National University)
Publication Information
Resources Recycling / v.18, no.5, 2009 , pp. 52-62 More about this Journal
Abstract
This research was carried out to formulate environmentally friendly wood preservatives with okara and to investigate the effects of the acid concentration used for the hydrolysis of okara and salt type on the decay resistance of the preservatives. Okara-based preservatives were formulated with okara hydrolyzates, which were prepared with 0, 1%, and 2% sulfuric acid at $25^{\circ}C$ for 1 hr, and salts such as copper chloride and/or sodium borate. The preservatives were treated into wood blocks by vacuum-pressure method, and then the treated wood blocks were leached in $70^{\circ}C$ hot water for 72 hrs. The fungal treatments of the leached wood blocks were conducted by brown-rot fungus, Tyromyces palustris, and white-rot fungus, Trametes versicolor, to examine the decay resistance of the preservatives. As the acid concentration used for hydrolysis of okara increased, the treat-ability and decay resistance of the preservatives were improved, which the leachability was decreased. Wood blocks treated with the okara/copper or okara/copper/borax, showed very good decay resistance against T. palustris and T. versicolor. However, wood blocks treated with the okara/borax and okara-free preservative solutions, were observed the fungal decay by T. palustris. The optimal conditions for the preparation of okara-based wood preservatives were formulated with okara hydrolyzed with 1% sulfuric acid, copper chloride and borax.
Keywords
tofu; okara; wood preservatives; decay resistance;
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