3.4. Organic acids content of water extracts of fermented and non-fermented rice bran using HPLC method A total of 5 types of organic acid were evaluated in nonfermented and fermented rice bran samples, namely oxalic, citric, succinic, kojic and acetic acids. As shown in Table 3, all organic acids were detected in non-fermented and A. oryzae- fermented rice bran extracts, while 4 types of organic acids were detected in mix-cultured fermented rice bran with the exception of succinic acid. On the other hand, oxalic and acetic acids were detected in all samples. Citric acid showed the most substantial improvement in A. oryzae- and mix-culturedfermented rice bran extracts, with more than 10-fold increase compared to non-fermented rice bran. All organic acids detected in fermented rice bran extracts showed significant ( p