20.500.12556/RUL-64078
Uporaba lesnih polisaharidov kot sladkorjev
Utilisation of wood polysaccharides as sugars
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
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
polisaharidi listavcev
ksilan
celuloza
parjenje
encimatska hidroliza
ekonomska analiza
true
false
false
Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije
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2015-07-10 19:46:59
2015-07-10 19:46:59
2022-08-01 12:41:26
0000-00-00 00:00:00
1999
0
0
Str. 165-168
št. 6
Let. 51
1999
0000-00-00
NiDoloceno
NiDoloceno
NiDoloceno
0000-00-00
0000-00-00
0000-00-00
630*813
0024-1067
453769
13940224
http://www.dlib.si/details/URN:NBN:SI:DOC-QPZM3XGJ
1
https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=64089
RAZ_Ishihara_Mitsuro_1999.pdf
RAZ_Ishihara_Mitsuro_1999.pdf
1
07F6425A8402248BDAC1E60C6A231CEA
f0d85f16f0c99324a1e667f87bf60edebc23110c7a64500d3089f6f162838ce5
c9be3ad4-574d-11ec-abdb-00155dcfd717
20.500.12556/rul/564cdbdd-8ebe-4dce-aec5-c4f13fe53655
https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=151885
Biotehniška fakulteta
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