Effect of extraction conditions on hemicellulose yields and optimisation for industrial processes

Abstract

Hemicellulose is a valuable component of agro-food industrial wastes and used in various areas such as drug manufacture and food industry for encapsulation and emulsification. In this study, effects of raw material type, particle size, and extraction conditions (alkaline concentration, temperature, time) and methods (direct alkaline extraction, alkaline extraction after component removal and acidic extraction method) on hemicellulose yields were investigated. Sugar beet pulp and corn wastes were used as raw material. The alkaline method resulted in 40.2% pure extracts, while the acidic method gave only 27.4% purity in the same extraction conditions. The optimal extraction conditions were found as 30°C temperature, 10% alkali (NaOH) and 24 h time (64.3%). It was also observed that removal of constituents such as fat, protein, starch and soluble sugar increased the purity of hemicellulose from 40.2% to 58.2% at the same conditions. The results indicated that using both low alkaline concentration and low temperature allows to recover higher-quality extracts.Hemicellulose extraction for food industry H. Yılmaz Celebioglu et al. À1, 0 and +1 are the coded levels for 30, 40 and 50°C; for 10%, 15% and 20%; and for 24, 48 and 72 h, respectively in RSM.

Valorization of Olive-Oil Industry Solid Waste: Statistical Optimization of Alkaline Extraction Conditions for Light-Coloured Hemicelluloses

“…Higher particle sizes led to a reduction in hemicelluloses extraction yield. As expected, decreasing the particle size, hence increasing surface area between solute and solvent caused increasing amount of product (29). Presumably, 1.3 mm OSW particle size already possesses enough large (an optimum) surface area for extraction, so that size reduction does not further increases the hemicellulose yield.…”

Isolamento de xilanas do bagaço de cana-de-açúcar integrado à hidrólise enzimática da celulose residual

“…A extração de xilana a partir dos bagaços pré-tratados lavado e não lavado foi realizada por dois métodos químicos e um método enzimático. A escolha dos métodos químicos partiu da observação de resultados de maior rendimento de recuperação de xilana na sua forma polimérica, utilizando álcali em temperaturas mais amenas, quando comparada a métodos que utilizam ácidos em altas temperaturas (CELEBIOGLU et al, 2012 . -Junior et al (2013), o volume total de poros acessíveis a uma sonda de 50 Ǻ, correspondente ao diâmetro médio de celulases (40kDa), variou de 0,32 mL/g em amostras de bagaço in natura para 1,0 mL/g em amostras de bagaço com menor concentração de lignina (6%).…”