Eucalyptus hydrolysate detoxification with activated charcoal adsorption or ion-exchange resins for xylitol production

Influence of the use of rice bran extract as a source of nutrients on xylitol production

“…Martinez et al (2003) reported that, at pH 5.5 and with 20 h -1 oxygen transfer coefficient, higher xylitol volumetric productivity (0.70 g.Lh -1 ) was achieved in a study on continuous fermentation process for xylitol production from sugarcane bagasse hydrolysate. Canilha, Almeida e Silva and Solenzal (2004) performed studies on eucalyptus hydrolysate detoxification with pH adjustment combined with activated charcoal adsorption (CA, 70.91 g.L -1 xylose) or ion-exchange resins (IE, 60.92 g.L -1 xylose) and their fermentation by Candida guilliermondii using 2 g.L -1 ammonium sulphate and 5 g.L -1 rice bran extract as nutritional supplements. These authors reported lower xylitol volumetric productivity (0.30 g.Lh -1 ) and fermentation efficiency (44%) during fermentation of the hydrolysate CA.…”

“…Rice bran extract has been used as a source of nutrients in the bioconversion of the xylose contained in different hemicellulosic hydrolysates into xylitol (MARTÍNEZ et al, 2002(MARTÍNEZ et al, , 2003(MARTÍNEZ et al, , 2007CANILHA;ALMEIDA E SILVA;SOLENZAL;MUSSATTO, ROBERTO, 2004;VILLARREAL et al, 2006;CANILHA et al, 2008). Rice bran is a by-product of the rice milling processing and is a source of vitamins and amino acids containing 12-15% oils, 11-12% proteins and 2.750 kcal.kg -1 of metabolizable energy (BUTOLO, 2002).…”

Isoprenoids Production from Lipid-Extracted Microalgal Biomass Residues Using the Engineered <em>E. coli</em>

“…As is shown in the following, five strategies have been developed to remove the inhibitors in the acidolysis hydrolysate based on the previous studies with some modifications [9][10][11][12][13]:…”

“…To date, many of investigations have shown that neutralization, overliming, activated charcoal, ion exchange resin and reducing agents have the ability to remove the inhibitors of the acidolysis hydrolysate [9][10][11][12][13]. In the present study, we employed five different above-mentioned detoxification methods.…”

“…Finally, 6.37 g/L of glucose was achieved based on the following hydrolysis condition: ratio of solid to acid (1:7), acid concentration (32 %), hydrolysis temperature (90 ℃), hydrolysis time (90 min). Since inhibitors (weak acid, furfural, 5-HMF) were formed during acid hydrolysis process [9], we adopted five different detoxification strategies with recombination to remove the inhibition consequence on the fermentation [9][10][11][12][13]. Among five methods, phosphoric acid/calcium hydroxide detoxification combination, the best detoxification way, was applied to remove acetic acid, furfural and 5-HMF about 55.32 %, 99.19 % and 98.22 % respectively.…”