Xylooligosaccharides production by acid hydrolysis of an alkaline extraction filtrate from Eucalyptus globulus bleached kraft pulp

Henriques, Patrícia; Martinho, Marta; Serrano, Maria de Lurdes; Sousa, António P. Mendes de; Alves, Ana Sofia

doi:10.1016/j.indcrop.2020.113066

Cited by 20 publications

(21 citation statements)

References 42 publications

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“…Besides, it was reported that the highest XOS yield of 45.18% was obtained with 1% sulfuric acid at 120°C for 60 min during the hydrolysis of the residual hemicelluloses of dissolving pulp ( 38 ). Henriques et al ( 39 ) concluded that a maximum XOS yield of 30.2% was obtained within 30 min at 100°C and pH 0.5 by nitric acid hydrolysis of xylan from Eucalyptus globulus bleached kraft pulp. The ability of dilute MA to efficiently hydrolyze xylan and generate XOS can be attributed to the low dissociation constant of MA (pKa1 = 1.83, pKa2 = 6.07) ( 40 , 41 ).…”

Section: Resultsmentioning

confidence: 99%

Production of Prebiotic Xylooligosaccharides via Dilute Maleic Acid-Mediated Xylan Hydrolysis Using an RSM-Model-Based Optimization Strategy

Jiang

Huang

et al. 2022

Front. Nutr.

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Xylooligosaccharides (XOS) are functional feed additives that are attracting growing commercial interest owing to their excellent ability to modulate the composition of the gut microbiota. The acid hydrolysis-based processing of xylan-containing materials has been proposed to represent a cost-effective approach to XOS preparation, with organic acids being preferable in this context. As such, in the present study, maleic acid was selected as a mild, edible organic acid for use in the hydrolysis of xylan to produce XOS. A response surface methodology (RSM) approach with a central composite design was employed to optimize maleic acid-mediated XOS production, resulting in a yield of 50.3% following a 15 min treatment with 0.08% maleic acid at 168°C. Under these conditions, the desired XOS degree of polymerization (2-3) was successfully achieved, demonstrating the viability of this using a low acid dose and a high reaction temperature to expedite the production of desired functional products. Moreover, as maleic acid is a relatively stable carboxylic acid, it has the potential to be recycled. These results suggest that dilute maleic acid-based thermal treatment of corncob-derived xylan can achieve satisfactory XOS yields, highlighting a promising and cost-effective approach to XOS production.

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Section: Resultsmentioning

confidence: 99%

Production of Prebiotic Xylooligosaccharides via Dilute Maleic Acid-Mediated Xylan Hydrolysis Using an RSM-Model-Based Optimization Strategy

Jiang

Huang

et al. 2022

Front. Nutr.

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“…Generally, enzymatic hydrolysis is preferable for XOS production as it requires mild operating conditions and does not produce degradation products or high amounts of monosaccharides. − However, despite the larger production of undesirable byproducts, acid hydrolysis exhibits simpler and faster kinetics, hence higher efficiency, being frequently used. ,− Furthermore, knowing the reaction kinetics, the production of monosaccharides and degradation products can be minimized by adjusting the operating conditions which, unlike for the enzymatic hydrolysis, can also be optimized to control the production of desired DPs of XOS.…”

Section: Introductionmentioning

confidence: 99%

“…However, higher temperatures and longer reaction times lead to XOS degradation . Furthermore, increasing the reaction time, temperature, and acid concentration promotes the hydrolyzation of higher DPs into smaller oligosaccharides such as X2 and X3. ,− , The type of acid is also an important criterion. Lin et al demonstrated that organic acids are more beneficial for XOS production than the conventional sulfuric acid, which is in accordance with Wang et al, who found great difficulty to obtain high yields of XOS with the latter.…”

Section: Introductionmentioning

confidence: 99%

“…In a previous work by Henriques et al, XOS were produced by acid hydrolysis, with nitric acid (HNO 3 ), of a filtrate obtained from the alkaline extraction of bleached Eucalyptus globulus pulp. In contrast to what is usually reported, the formation of furfural was not detected, probably due to the mild temperatures used, xylose being the only contaminant.…”

Section: Introductionmentioning

confidence: 99%

“…As the understanding of the reaction kinetics, and how every experimental condition influences the production of XOS and undesirable products, is essential for further process improvements, in this work, a kinetic model of XOS production based on the experimental data from Henriques et al is developed.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic Modeling of Xylooligosaccharides Production by Acid Hydrolysis of an Eucalyptus globulus Pulp Extract

Henriques¹,

Alves²,

Serrano³

et al. 2021

Ind. Eng. Chem. Res.

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The production of xylooligosaccharides (XOS) by acid hydrolysis using an alkaline extraction filtrate from the bleached kraft pulp of Eucalyptus globulus is a rapid and effective process. The reaction kinetics knowledge is, however, extremely important to optimize the experimental conditions that maximize XOS production and limit the formation of xylose (unwanted product). In this work, a pseudo-homogeneous model of irreversible first-order reactions is proposed, considering the sequential degradation of fast-reacting xylan into high-and lowmolecular-weight oligomers, followed by their conversion to xylose. A kinetic parameter estimation based on the Arrhenius equation was performed, considering the temperature and acid concentration effects. The kinetic model presented good fittings to the experimental results (R 2 mostly between 0.97 and 0.99), proving its suitability to describe xylan hydrolysis over time. The mapping of XOS maximum yields as a function of pH, temperature, and time was also represented, allowing fast prediction for other operating conditions.

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Carbohydrates

Gerschenson

Rojas

Fissore

2022

Nutraceutical and Functional Food Components

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Xylooligosaccharides production by acid hydrolysis of an alkaline extraction filtrate from Eucalyptus globulus bleached kraft pulp

Cited by 20 publications

References 42 publications

Production of Prebiotic Xylooligosaccharides via Dilute Maleic Acid-Mediated Xylan Hydrolysis Using an RSM-Model-Based Optimization Strategy

Production of Prebiotic Xylooligosaccharides via Dilute Maleic Acid-Mediated Xylan Hydrolysis Using an RSM-Model-Based Optimization Strategy

Kinetic Modeling of Xylooligosaccharides Production by Acid Hydrolysis of an Eucalyptus globulus Pulp Extract

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