Xylitol from rice husks by acid hydrolysis and Candida yeast fermentation

Abstract

Recebido em 9/6/12; aceito em 10/12/12; publicado na web em 4/4/13An investigation was conducted into the production of xylose by acid hydrolysis of rice husks and its subsequent bioconversion to xylitol. The parameters were optimised using the response surface methodology. The fermentation stage took place with the aid of the yeast species Candida guilliermondii and Candida tropicalis. An evaluation of the influence of several biomass pre-treatments was also performed. The effects of the acid concentration and hydrolysate pH on xylitol global yield were also assessed, and the highest yield of xylitol was 64.0% (w/w). The main products, xylose and xylitol, were identified and quantified by means of liquid chromatography.

Characterization of biomasses from the north and northeast regions of Brazil for processes in biorefineries

“…Several lignocellulosic residues may be used to produce energy and as chemical inputs. Many of these biomasses, such as coconut husk, Brazil nut epicarp and mesocarp, babassu endocarp and mesocarp, pequi stone, agave, among others, present high levels of carbohydrates and lignin, which can be converted into high value-added products Bridgwater, 2012;Gupta & Verma, 2015;Rambo et al, 2011Rambo et al, , 2013Rambo et al, , 2015.…”

Evaluation of some lignocellulosic byproducts of food industry for microbial xylitol production by Candida tropicalis

“…It was demonstrated that 10 g/100 mL solid/liquid ratio and 1.25 % sulfuric acid would be appropriate for initial preparation of the hydrolysate before detoxification and concentration. Various lignocellulosic residues have been reported to be used for xylitol production, some of which were corncob (Cheng et al 2009; Kamat et al 2013; Ramesh et al 2013) sugarcane straw (Hernández-Pérez et al 2016), cotton stalks (Akpinar et al 2011), grape marc (Salgado et al 2012), cashew apple bagasse (Albuquerque et al 2015a), wheat straw (Canilha et al 2005), wood sawdust (Rafiqul and Mimi Sakinah 2012), vine trimming wastes (Rivas et al 2007), and rice husks (Rambo et al 2013). Chestnut shells have been used in some studies for different purposes (Aires et al 2016).…”

Biotechnological Transformation of Lignocellulosic Biomass in to Industrial Products: An Overview

“…[77] Maximam hydrogen yield (0.74 mmol H2/g-VS added straw) was obtained from anaerobic co-digestion of rice straw and sewage sludge [50] Corncob Cellulase activity observed (213.4 IU/g cellulose) in submerged fermentation by Trichoderma reeseiZU-02 using corn cob as substrate [78] Fermentation of corncob hemicellulose powder containing 4.5 g/l as xylan content produced 3.01 g/l of xylitol by Candida tropicalis. [79] Maximum 119 ml H2/g corn cob produced from enzymatic hydrolysate of corn cob by the fermentation through Clostridium hydrogeniproducens HR-1 [80] Maize (corn) stover…”