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Title: Two-step hydrolysis of rice (Oryza sativa) husk as treated by semi-flow hot-compressed water
Authors: Phaiboonsilpa, Natthanon
Ogura, Mai
Yamauchi, Kazuchika
Rabemanolontsoa, Harifara  kyouindb  KAKEN_id
Saka, Shiro  kyouindb  KAKEN_id
Author's alias: 坂, 志朗
Keywords: Cellulose
Hot-compressed water
Rice husk
Issue Date: Aug-2013
Publisher: Elsevier B.V.
Journal title: Industrial Crops and Products
Volume: 49
Start page: 484
End page: 491
Abstract: Two-step hydrolysis of husk obtained from rice (Oryza sativa) was investigated as one of the monocotyledonous angiosperms under the semi-flow hot-compressed water treatment at 230 °C/10 MPa/15 min (1st stage) and 270 °C/10 MPa/30 min (2nd stage). Prior to the hot-compressed water treatment, cold-water extraction at 20 °C/10 MPa/30 min was performed. It was found that some inorganic constituents and free neutral sugars not being chemically bonded with the plant cell wall were recovered in the cold-water extracts. In the 1st stage, hemicelluloses and pectin were selectively hydrolyzed, as well as lignin being partially decomposed. In addition, protein was found to some extent to be hydrolyzed by the hot-compressed water treatment and various amino acids to form the protein of rice husk were identified. Hydrolysis of cellulose was, however, observed in the 2nd stage. Some additional decomposition of lignin and protein was revealed at this stage as well. In total, 96.1% of oven-dried extractives-free rice husk sample could be solubilized into cold and hot-compressed water. Various products in the water-soluble portion were primarily recovered as saccharides, which were partially isomerized and then dehydrated and fragmented. The 3.9% of residue after the treatment was composed mainly of lignin and a trace of silica.
Rights: © 2013 Elsevier B.V.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
DOI(Published Version): 10.1016/j.indcrop.2013.05.025
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