Biological evaluation of soybean line with low trypsin inhibitor activities

The soybean cultivar BR 36 with conventional levels of trypsin inhibitors a ctivity and the soybean line BRM95-5262, which was genetically selected to contain low activity of trypsin inhibitors were used for biological assays with rats. BR 36 and BRM95-5262 contained 40 and 20, and 30 and 20% of rela tive residual activity of trypsin inhibitors, respectively. The mean values of PER and NPR showed that treatments with crude soybeans were minor than treatments with soybean thermically processed. However, the treatments of t hermically processed soybean did not showed significative differences (p gr eater than or equal to0.05). When the trypsin inhibitors activity were 8.61 and 8.44 UIT/mg of samples or 20 and 30% of relative residual activity of cultivar BR 36 and line BRM95-5262, respectively, it was observed that mean values of PER and NPR were not significatives. The mean values of CDA and CDV of treatments with crude soybeans were minor than treatment with casein and similar to the treatments with soybean thermically processed. So, it c an be concluded that the biological evaluation obtained with soybean protei n were dependent of initial trypsin inhibitors activities and of its respec tive thermical treatment. There was advantage in the use of BRM95-5262 soyb ean line with low trypsin inhibitors activity.