Acid hydrolysis of sugar beet pulp as pretreatment for fermentation

Production of lactic acid and ethanol by Rhizopus oryzae integrated with cassava pulp hydrolysis

“…However, a much higher glucose yield (up to 85% theoretical yield) was obtained with acid hydrolysis while less than 40% was obtained in enzymatic hydrolysis. The lower glucose (reducing sugar) yield in enzymatic hydrolysis can be attributed to: (1) enzyme inhibition by glucose [17,31,32], (2) physical hindrance effect of lignocellulosic structure present in the pulp [17,21,26,28], and (3) lack of hydrolysis of hemicellulose in the treatment [17]. Acid hydrolysis resulted in complete hydrolysis of lignocelluloses and starch granules, thus giving the highest glucose yield within a relatively short time.…”

“…For a short acid treatment time, more glucose can be released from starch and cellulose at higher acid concentrations because more H ? ions led to a higher degradation rate of the lignocellulosic material and starch present in the cassava pulp [21,22]. For hydrolysis with strong acids (HCl and H 2 SO 4 ), it only took about 15 min to reach the maximum average glucose yield of *0.85 g/g cassava pulp under the steaming condition (121°C, 15 psig) with the acid concentration above 1.0 N. Further increasing the reaction time decreased glucose yield especially when the acid concentration was higher than 1 N. An increase in acetic acid concentration at high HCl concentrations and long treatment times was in agreement with the decrease in glucose yield at those hydrolysis conditions, thus confirmed the further hydrolysis of sugars and the formation of furan derivatives such as furfural and 5-hydroxymethylfurfural (5-HMF), products of pentose and hexose degradation [17].…”

“…At the same acid normality, there were more H ? ions in the HCl solution, leading to the higher degradation rates of lignocelluloses and starch in the cassava pulp [21,23]. However, excess H ?…”

Potential of Biowaste from the Food Industry as a Biomass Resource

“…However since lignocellulosic fiber materials represent the most abundant fraction of the biogenic residues in food industry it would be even more important if ethanol technology could be applied more efficiently also to this type of material. The key issue to be solved in this regard is the optimization of the pre-treatment of the diverse sorts of cellulosic residue material [29], [36]- [37].…”

Production of Rhodotorula glutinis: a yeast that secretes a-L-arabinofuranosidase

“…Likewise, beet cosette has been studied as a cheap substrate source in Chile for some enzyme-producing microorganisms, especially fungi (Illanes et al 1992;Chamy et al 1994). Considering this information, we studied the effect of these industrial carbon sources on the growth of the yeast and the production of Abf.…”