Uporaba lesnih polisaharidov kot sladkorjev

Ishihara, Mitsuro (author), Tišler, Vesna (author of introduction, etc.)

Na Japonskem gozd pokriva približno 25 mio ha, to je okoli 2/3 celotne površine. Gozd je različen od sub-kontinentalnih iglavcev do sub-tropskega gozda na jugu. V zadnjih desetletjih je bil nekvaliteten les listavcev, ki se je prvotno izkoriščal le za kurjavo in izdelavo oglja, uporaben le kot material za celulozno industrijo in vzgojo gob. Proces parjenja trdih lesov je bil preučevan za izrabo polisaharidov trdega lesa za izdelavo sladkorja kot del "Programa uporabe biomase", ki ga je podpirala japonska vlada. Izplen Izplen hidrolizatov ksilana (mešanice ksiloze ksilooligomerov) iz različnih drevesnih vrst pri parjenju je pod optimiziranimi pogoji znašal od 14-22%. Kislinski ksilooligomeri, ki so vsebovali 4-O-metilglukronsko kislinski preostanek ali galakturonski kisli preostanek so vsebovali približno 10% ksilanove hidrolizata. Encimatska hidroliza preostanka lignoceluloze v večjem obsegu je bila izvedena z uporabo aparata za kontinuirano hidrolizo z reciklirnim sistemom celulaz. Glukoza je bila dominantna komponenta preostanka sladkorjev: večino hemiceluloze v lesu lahko ločimo s postopkom parjenja, ki mu sledi ekstrakcija z vodo. Na kraju je opisana ekonomska analiza proizvodnega procesa, ki jo je izvedla Japonska gozdna agencija

• Language: Slovenian
• Keywords: polisaharidi listavcev, ksilan, celuloza, parjenje, encimatska hidroliza, ekonomska analiza
• Work type: Not categorized
• Typology: 1.02 - Review Article
• Organization: BF - Biotechnical Faculty
• Publisher: Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije
• Year: 1999
• Number of pages: Str. 165-168
• Numbering: Let. 51, št. 6
• PID: 20.500.12556/RUL-64078
• UDC: 630*813
• ISSN on article: 0024-1067
• COBISS.SI-ID: 453769
• Publication date in RUL: 10.07.2015

ISHIHARA, Mitsuro, 1999, Uporaba lesnih polisaharidov kot sladkorjev. Les [online]. 1999. Vol. 51, no. 6, p. 165–168. [Accessed 14 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=64078

Record is a part of a journal

• Title: Les
• Shortened title: Les
• Publisher: Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije, Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije, Biotehniška fakulteta, Oddelek za lesarstvo, Založba Univerze, Biotehniška fakulteta, Oddelek za lesarstvo, Založba Univerze
• ISSN: 0024-1067
• COBISS.SI-ID: 13940224

Secondary language

• Language: English
• Title: Utilisation of wood polysaccharides as sugars

Abstract

In Japan, the forest covers approximately 25 million ha, that is, about two-thirds of total land area, with different forest types from sub-frigid conifer forest in the north to sub-tropical forest in the south. Over a few decades, however, the low-quality hardwoods which had been utilised as firewood and charchoal have not been used except raw materials for pulp and mushroom cultivation. The steaming process of hardwood was studied for utilisation of hardwood polysaccharides as sugars as a part of Biomass Conversion Program by the Japanese Government. The yield of xylan hydrolysate (mixture of xylose and xylooligomers) from various hardwood species on steaming was 14-22 % under optimized conditions. Acidic xylooligomers carryinga 4-O-methylglucuronic acid residue or a galacturonic acid residue comprised approximately 10 % of the xylan hydrolysate. The enzymatic hydrolysis of residual lignocellulose was attemped on a large scale using an apparatus for continuous hydrolysis with a recycle system of cellulases. Glucose was a dominant component of the reducing sugars produced: most of hemicellulose in hardwood could be separated by the procedure of steaming followed by extracting with water. Finally, an economic analysis of hardwood components utilisation process on a plant scale by the Japanese Forestry Agency was described