Production of a cellulosic substrate susceptible to enzymatic hydrolysis from prehydrolyzed barley husks
Moldes, Ana Belén; Cruz, José Manuel; Domíniquez, José Manuel; Parajó, Juan Carlos (2002)
Moldes, Ana Belén
Cruz, José Manuel
Domíniquez, José Manuel
Parajó, Juan Carlos
Julkaisusarja
Agricultural and Food Science in Finland
Volyymi
11
Numero
1
Sivut
51-58
MTT Agrifood Research Finland The Scientific Agricultural Society of Finland
2002
Julkaisun pysyvä osoite on
http://urn.fi/URN:NBN:fi-fe201604069163
http://urn.fi/URN:NBN:fi-fe201604069163
Tiivistelmä
An effective process for the chemical-biotechnological utilization of barley husks is reported. A first treatment with sulfuric acid (prehydrolysis) allowed the solubilization of hemicelluloses to give xylose-containing liquors (suitable to make fermentation media for xylitol production) and a solid phase containing cellulose and lignin. The solid residues from prehydrolysis were treated with NaOH in order to increase their cellulase digestibility. In the alkaline treatments, the effects of temperature (in the range, 50-130ºC), reaction time (10-60 min) and NaOH concentration (3-10 weight percent of solution) on the composition of solid residues were assessed by means of an experimental plan with factorial structure. The cellulose content increased with temperature and NaOH concentration, whereas the duration of treatments was not influential within the range tested. The treated samples showed high susceptibility toward the enzymatic hydrolysis with cellulases, leading to almost quantitative glucose yields under selected operational conditions.