Oxygen Uptake Rate in Production of Xylitol by Candida guilliermondii with Different Aeration Rates and Initial Xylose Concentrations

Gimenes, Maria Antonieta P.; Carlos, Luiz Cláudio S.; Faria, Luís; Pereira, Nei

doi:10.1007/978-1-4612-0119-9_85

Cited by 5 publications

(6 citation statements)

References 8 publications

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“…Similar effects of S 0 on Y P/S , q P and P have been recently observed for Candida guilliermondii without using factorial design (Gimenes, Carlos, Faria, & Pereira, 2002). So, the above conditions, which simultaneously optimized the four different response variables, have to be considered as an optimal compromise between different requirements for an industrial development of the process.…”

Section: Runsmentioning

confidence: 67%

Use of response surface methodology for optimization of xylitol production by the new yeast strain Debaryomyces hansenii UFV-170

Sampaio

Faveri

Mantovani

et al. 2006

Journal of Food Engineering

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Section: Runsmentioning

confidence: 67%

Use of response surface methodology for optimization of xylitol production by the new yeast strain Debaryomyces hansenii UFV-170

Sampaio

Faveri

Mantovani

et al. 2006

Journal of Food Engineering

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“…guilliermondii (ATCC 201935) was kept in a solid medium composed of 20 g/L glucose, 10 g/L yeast extract, 20 g/L peptone, and 20 g/L agar. The inoculum for fermentation procedures was made according to Gimenes et al Fermentation experiments were carried out in a 125-mL Erlenmeyer flask containing 25 mL of neutralized liquor (nonsterilized at pH 5.5), supplemented with 1.25 g/L urea, 1.1 g/L KH 2 PO 4 , and 0.5 g/L yeast extract and 5.5 g/L C. guilliermondii cells.…”

Section: Methodsmentioning

confidence: 99%

Optimal Pretreatment of Eucalyptus globulus by Hydrothermolysis and Alkaline Extraction for Microbial Production of Ethanol and Xylitol

Castro

Parra

Yáñez-S

et al. 2013

Ind. Eng. Chem. Res.

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Fractionation of Eucalyptus globulus wood chips is mandatory for developing a biorefinery process. In order to achieve this, products released from hydrothermolysis pretreatment were studied within the severity (log R 0 ) range 3.3−4.5. The highest solubilized xylose yield was 56% (DWB) at log R 0 3.9. Values higher than log R 0 4.1 have led to high xylose dehydration rates. Detoxification steps applied to the liquor removed acetic acid (55%), furfural (94%), and hydroxymethylfurfural (HMF) (31%). Fermentation of liquor with Candida guilliermondii resulted in a xylitol yield of 0.37 g of xylitol produced per gram of xylose consumed (equivalent to 71% of the control with pure xylose). Pulp-1 (from hydrothermolysis pretreatment) was further pretreated with NaOH for lignin removal (obtaining Pulp-2). Cellulose composition in Pulp-1 and Pulp-2 remains almost unaltered; lignin content in Pulp-2 was 50% lower than in Pulp-1. Simultaneous saccharification and fermentation (SSF) experiments for both pulps reached similar ethanol yields of 0.76 and 0.70 g of ethanol produced per gram of ethanol potentially produced from wood, respectively. Recovery of hemicellulose at the beginning of the process is a key step for getting pulps with high cellulose composition available for developing a biorefinery process of E. globulus.

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“…Perhaps, a more gradual transition should be done to avoid what seems to be an inhibitory effect. Earlier studies [10,11] did not mention this inhibition; on the contrary, as the biochemistry of the process would suggest, high D-xylose concentrations provided better yields on xylitol. Nonetheless, these other works were not carried out under a one-pot fermentation strategy and it can be supposed that an accumulation of oxidized cofactors during initial steps -excess of aeration -may have occurred, therefore leading to low xylitol bioconversion.…”

Section: One-pot Fermentationmentioning

confidence: 94%

Evaluation of Candida guilliermondii cell growth and one-pot fermentation for xylitol bioproduction

Modesto

Temtemples

Seidl

et al. 2015

JBT

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I S S N 2348-6 2 0 1 V o l u m e 5 N u m b e r 3 J o u r n a l o f A d v a n c e s i n B i o t e c h n o l o g y 748 | P a g e ABSTRACTXylitol is a polyalcohol with a high sweetener power that presents healthy benefits when compared to sucrose, such as prevention of caries and metabolism only partially dependent on insulin. Its bioproduction, besides being within the context of Biorefiney and Green Chemistry, presents advantages when compared to the traditional chemical process. This study analyzed Candida guilliermondii IM/UFRJ 50088 cells growth for three different operational strategies, two of them conducted on shake flasks and the other one held on instrumented bioreactor. The latter provided the best results, achieving a maximum cell productivity (Qx max) of 0.61 g/L.h while reaching cell concentrations higher than 20 g/L. For the one-pot fermentation assay, despite low xylitol yield (YP/S≈0,1g/g) obtained, which shows that further research is necessary, the propagation steps were successful.

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Oxygen Uptake Rate in Production of Xylitol by Candida guilliermondii with Different Aeration Rates and Initial Xylose Concentrations

Cited by 5 publications

References 8 publications

Use of response surface methodology for optimization of xylitol production by the new yeast strain Debaryomyces hansenii UFV-170

Use of response surface methodology for optimization of xylitol production by the new yeast strain Debaryomyces hansenii UFV-170

Optimal Pretreatment of Eucalyptus globulus by Hydrothermolysis and Alkaline Extraction for Microbial Production of Ethanol and Xylitol

Evaluation of Candida guilliermondii cell growth and one-pot fermentation for xylitol bioproduction

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