Effect of Ozonation on the Reactivity of Lignocellulose Substrates in Enzymatic Hydrolysesстатья
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Дата последнего поиска статьи во внешних источниках: 14 сентября 2013 г.
Аннотация:The efficiency of pretreatment of aspen wood with ozone for subsequent enzymatic hydrolysis
into sugars is determined by the amount of absorbed ozone. The ozone absorption rate depended on the water
content in the sample being ozonized and was maximum at a relative humidity of wood of ~40%. As a result
of ozone pretreatment, the initial rate of the enzymatic hydrolysis of wood under the action of a cellulase
complex increased eightfold, and the maximum yield of sugars increased tenfold depending on the ozone
dose. The ozonation at ozone doses of more than 3 mol/PPU (per phenylpropane structural unit of lignin)
led to a decrease in the yield of sugars because of the oxidative destruction of cellulose and hemicellulose. The
alkaline ozonation in 2 and 12% NaOH was inefficient because of the accompanying oxidation of carbohy
drates and considerably decreased the yield of sugars.