ALKALI-MODIFIED SOY PROTEIN WITH IMPROVED ADHESIVE AND HYDROPHOBIC PROPERTIES

Adhesive and hydrophobic properties of alkali-modified soy protein (AM SP) and trypsin-modified soy protein (TMSP) on wood were investigated. Modifying soy protein (i) under moderate alkaline conditions (pH 10.0 at 50 degrees C) and (ii) with trypsin, enhanced adhesive strengths ( 730 and 743 N, respectively) compared with unmodified soy protein (340 N). Hy drophobicities of AMSP, TMSP, and unmodified soy protein isola te by sodium dodecyl sulfate binding and 1-anilino-8-naphthalene sulfo nate methods were 7.6, 6.4, 5.0 and 39, 27, 13, respectively. Modified soy protein adhesives with higher hydrophobicities (AMSP and TMSP) ha d enhanced water-resistance properties.