Investigation of the effect of temperature and alkaline concentration on the solubilization of phenolic acids from dilute acid-pretreated wheat straw |
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| Affiliation: | 1. Department of Health and Nutrition Biotechnology, Asia University, 500, Lioufeng Road, Wufeng, Taichung 41354, Taiwan;2. Food Safety and Inspection Center, Asia University, 500, Lioufeng Road, Wufeng, Taichung 41354, Taiwan;3. Department of Medical Research, China Medical University Hospital, China Medical University, 2 Yude Road, Taichung, 40447, Taiwan;4. School of Health Diet and Industry Management, Chung Shan Medical University, 110, Jianguo N. Road, Sec. 1, Taichung 40201, Taiwan;5. Department of Nutrition, Chung Shan Medical University Hospital, 110, Jianguo N. Road, Sec. 1, Taichung 40201, Taiwan;6. Department of Beauty Science, National Taichung University of Science and Technology, 129, Sanmin Road, Sec.3, Taichung 40401, Taiwan;7. Graduate Institute of Basic Medical Science, China Medical University, 91, Hsueh-Shih Road, Taichung 40402, Taiwan;8. Department of Chinese Medicine, China Medical University Hospital, 91, Hsueh-Shih Road, Taichung 40402, Taiwan;1. Sorbonne universités, Université de Technologie de Compiègne, Département de Génie des Procédés Industriels, Unité Transformations Intégrées de la Matière Renouvelable (UTC/ESCOM, EA 4297 TIMR), Centre de Recherche de Royallieu, B.P. 20529-60205 Compiègne Cedex, France;2. Ecole Supérieure de Chimie Organique et Minérale, Transformations Intégrées de la Matière Renouvelable (UTC/ESCOM, EA 4297 TIMR), Allée du réseau Jean-Marie Buckmaster, 60200 Compiègne, France;3. Laboratoire Phenobio, Centre Montesquieu, 1 allée Jean Rostand, 33650 Martillac, France |
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| Abstract: | This work deals with the investigation of the effect of alkaline concentration and temperature on the solubilization of phenolic materials from wheat straw, an abundant agricultural waste found in Turkey. The solid residue obtained after dilute acid pretreatment of wheat straw (SPWS) was treated by alkaline to solubilize the lignin to phenolic acids. Four different alkaline concentrations at 120 °C and seven different temperatures with 2 M NaOH were evaluated for the degree of solubilization of the phenolic materials, and the antioxidant activities of the soluble phenolic materials were determined. It was found that coumaric and ferulic acids were the major phenolic acids in all of the conditions tested. The highest antioxidant capacity of the hydrolysate of SPWS was obtained with 2 M NaOH at 150 °C where DPPH*, FRAP and TEAC values were found to be 3.23, 10.27 and 13.70 μmol/g WS, respectively. |
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| Keywords: | Wheat straw Lignin Ferulic acid Coumaric acid Antioxidant Phenolic acid |
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