Characteristics of Rice Flour Breads Using Yeast Isolated from Pear Red Bartlett Fruits

To develop high qualities of rice flour breads, we tried to prepare breads using rice flours from major five non-glutinous rice cultivars on market shares of Japan and wild-type Saccharomyces cerevisiae strain YTPR1 isolated from pear Red Bartlett fruits. Apparent amylose contents of rice flours were measured about 12.1-19.9%. Damaged starch contents of these flours were about 22% regardless to the kinds of rice cultivars. Gluten was added about 20 wt.% based on rice flour, and breads were made in the same way. Any bread has caused caving. Next, the amount of water added in dough was regulated in consideration of moisture contents of rice flours. Except for Akitakomachi flour, breads largely expanded, although loaves volumes did not amount to that on bread made from bread flour and commercially available baker’s dried yeast. It was observed correlation between the amount of water and amylose contents of rice flours with R2 = 0.703. It suggested that the amount of water added in dough might estimate from amylose contents of rice flours. Specific volumes of these loaves were low compared with that made from bread flour. However, by sensory analysis, breads made from Hinohikari and Haenuki flours had total points closest to that made from bread flour- it could produce high quality of breads using Hinohikari and Haenuki flours and yeast isolated from pear Red Bartlett fruits.