In this study, we investigated the formation of ferulic acid, one of potential antioxidants, medicines, and cosmetics, by the hydrolysis of γ-oryzanol contained in by-products of rice bran oil processing. | Tạp chí phân tích Hóa, Lý và Sinh học - Tập 22, Số 2/2017 THE FORMATION OF FERULIC ACID FROM GAMMA-ORYZANOL HYDROLYSIS UNDER ALKALINE CONDITION USING ULTRASONIC IRRADIATION Đến tòa soạn 5-5-2017 Hoa Thi Truong, Manh Van Do, Long Duc Huynh, Linh Thi Nguyen Danang Environmental Technology Center, Institute of Environmental Technology, Vietnam Academy of Science and Technology Kiyoshi Imamura, Yasuaki Maeda Research Organization for University Community Collaborations, Osaka Prefecture University Ngo Dinh Vu Viet Tri University of Industry TÓM TẮT NGHIÊN CỨU ĐIỀU CHẾ AXIT FERULIC TỪ QUÁ TRÌNH THỦY PHÂN GAMMA ORYZANOL TRONG MÔI TRƯỜNG KIỀM VỚI SỰ HỖ TRỢ CỦA SONG SIÊU ÂM In this study, we investigated the formation of ferulic acid, one of potential antioxidants, medicines, and cosmetics, by the hydrolysis of γ-oryzanol contained in by-products of rice bran oil processing. Using a base-catalysed reaction, the hydrolysis of γ-oryzanol was examined, and the experiments were conducted with various conditions of catalyst amounts, temperature dependency, and ultrasonic frequencies. After 3 hours of conventional heating, 45% and 73% yield of ferulic acid was obtained using a 10:1 (wt/wt) ratio of KOH/ γ-oryzanol at the temperature of 60, and 75 C, respectively. The different frequencies (26, 78 and 130 kHz) were investigated to examine effect of ultrasound on yield of hydrolysis. Among them, the uses of 78 and 130 kHz irradiation accelerated the formation of ferulic acid up to - fold times greater than that by the conventional heating at 60 ºC, and that yield was increased only times when using lower frequency (26 kHz) at same temperature. Utilizing ultrasonic irradiation (78 and 130 kHz) at 75 C, the hydrolysis of γoryzanol proceeded quantitatively, and the yield of ferulic acid was achieved more than 90%. 138 Keywords: ferulic acid, γ-oryzanol, ultrasound, base-catalysed reaction, hydrolysis highly resonance stabilized since the unpaired electron may be present
