Optimization and hydrolysis of cellulose under subcritical water treatment for the production of total reducing sugars

Mohan, Mood; Timung, Robinson; Deshavath, Narendra Naik; Banerjee, Tamal; Goud, Vaibhav V.; Dasu, Veeranki Venkata

doi:10.1039/c5ra20319h

Cited by 37 publications

(30 citation statements)

References 49 publications

(71 reference statements)

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“…The slight difference between the spectrums of the sample after SCWE and the control sample provides some evidence of SCWE's ability to break down the chemical structures of cellulose and hemicellulose in the wood matrices of A. malaccensis. Although the changes in FTIR of the sample from SCWE in this work is not apparent, previous studies have demonstrated the effective influence of the SCWE condition on the hydrolysis of the sample's cellulose and hemicellulose to glucose [39,53]. In short, the FTIR analysis showed some changes and partially supports other findings (yield and SEM) from this work.…”

Section: Fourier Transform Infrared Spectroscopy Analysis Of Wood Samplesupporting

confidence: 82%

Towards Higher Oil Yield and Quality of Essential Oil Extracted from Aquilaria malaccensis Wood via the Subcritical Technique

et al. 2020

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A method that delivers a high yield and excellent quality of essential oil, which retains most of its value-added compounds, and undergoes least change after the extraction process, is greatly sought after. Although chemical free methods are acceptable, they call for an extensive processing time, while the yield and quality from these methods are often disappointing. This work utilizes subcritical water technology to address these issues. In this undertaking, essential oil was extracted from Aquilaria malaccensis wood by way of subcritical conditions, and characterized through gas chromatography/mass spectroscopy (GC/MS). Optimization through response surface methodology revealed temperature to be the most critical factor for the extraction process, while the optimum conditions for temperature, sample-to-solvent ratio, and time for subcritical water extraction was revealed as 225 °C, 0.2 gr/mL, and 17 min, respectively. The subcritical water extraction technique involves two simultaneous processes, which are based on good fitting to the two-site kinetic and second order model. In comparison to the hydrodistillation method, GC/MS results indicated that the quality of A. malaccensis’ wood oils, derived through the subcritical water technique, are of significantly better quality, while containing many constructive value-added compounds, such as furfural and guaiacol, which are useful for the production of pesticides and medicines. Pore size, functional groups, and morphology analysis revealed the occurrence of substantial damage to the samples, which facilitated an improved extraction of bio-products. In comparison to conventional methods, the use of the subcritical method not only involves a shorter processing time, but also delivers a higher oil yield and quality.

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Section: Fourier Transform Infrared Spectroscopy Analysis Of Wood Samplesupporting

confidence: 82%

Towards Higher Oil Yield and Quality of Essential Oil Extracted from Aquilaria malaccensis Wood via the Subcritical Technique

et al. 2020

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“…On the other hand, higher conversion of sugar into degraded products and the dominancy of pyrolysis reaction explain the dropped of sugar yield observed for both layers with temperature. Sugar decomposed rapidly to degraded products such as 5-HMF and furfural at high temperature and also, may cause some thermally-labile compound degrade after released from the sample matrix [46], [47].…”

Section: Total Sugars (Ws Phase)mentioning

confidence: 99%

“…organic acids, erythrose, glycolaldehyde, furfural, 5-HMF etc. at high temperatures [44], [46]. Moreover, the highest total sugar yields for both layers shared the same maximum temperature peak, 210 °C with those of oligosaccharides.…”

Section: Oligosaccharides and Tri-di- Monosaccharides (Ws Phase)mentioning

confidence: 99%

Production of Valuable Materials from Sago Bark Using Subcritical Water Treatment

Amin¹,

Sabli²,

Izhar³

et al. 2020

International Journal of Engineering Research and Technology

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Sago bark is generated as by-product from sago starch industries. Malaysia as one of the biggest exporter of sago starch produces a lot of sago bark wastes which are now burned on-site and underutilized. This study aims to apply subcritical water as a green solvent for hydrolysis of sago bark in order to obtain the value-added products. Inner and outer layers of sago bark were subjected to subcritical water treatment at 180 °C to 320 °C for 5 minutes. Inner layer showed higher yield of total organic carbon and total sugar at 210 °C than the outer layer, 0.40 and 0.67 g/g-dry sample respectively. Both layers had generated similar types of monosaccharides and inner layer showed extremely better yield of glucose, xylose and arabinose with the value of 0.125, 0.123 and 0.019 g/g-dry SB, respectively. Six organic acids were identified and were most favored to produce at a higher temperature. The increasing temperature had led to an apparent tar yields, ~0.40 g/g-dry SB and a huge drop of solid residues, ≥75%. In general, the inner layer was more susceptible to subcritical water treatment than the outer layer with evident yields of all products produced.

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“…6−8 The conversion of biomass consists of a set of chemical and biological processes, including separation, conversion of biopolymers into other valuable products, and fermentation reactions. 5,9−11 Because of the complex structure and strong intra- and intermolecular hydrogen bonding in the biomass, these processes require suitable solvents for the dissolution of its components. 5…”

Section: Introductionmentioning

confidence: 99%

COSMO-RS-Based Screening of Antisolvents for the Separation of Sugars from Ionic Liquids: Experimental and Molecular Dynamic Simulations

2018

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The use of ionic liquids (ILs) in the biorefinery process has been increasing for the past few decades. In biorefinery, the separation process with respect to sugars needs to be evaluated for an efficient process design. Therefore, the present work aims to investigate the separation of sugars and ILs by means of a precipitation process using an antisolvent method. For this purpose, both theoretical and experimental studies were conducted. Initially, the conductor-like screening model for real solvents model was employed to screen the suitable antisolvents for the separation of sugars from the ILs. From the screening study, dichloromethane (DCM) and 1,2-dichloroethane were found to be the better antisolvents for the separation process. With the selected antisolvents, precipitation experiments were conducted for the mixtures involving four different sugars and three ILs at different experimental conditions. The process variables such as different antisolvents, sugars, ILs, antisolvent–IL molar ratios, and temperatures were examined in terms of their effect on sugar removal and IL recovery. DCM was found to be the most suitable antisolvent in this study with 90–99% of sugar removal and 80–98% of IL recovery. Further, molecular dynamics simulations were adopted to understand the structural properties of carbohydrates with ILs and antisolvents via interaction energies, hydrogen bonding, and coordination numbers. It was observed that the interaction energy between the sugars and IL plays a critical role in the removal of sugar. Higher the interaction energy between the sugars and IL, lower is the sugar removal.

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Optimization and hydrolysis of cellulose under subcritical water treatment for the production of total reducing sugars

Abstract: Subcritical water (SCW) treatment has gained enormous attention as an environmentally friendly technique for organic matter and an attractive reaction medium for a variety of applications. In the current work the process parameters were optimized by RSM model.

Cited by 37 publications

References 49 publications

Towards Higher Oil Yield and Quality of Essential Oil Extracted from Aquilaria malaccensis Wood via the Subcritical Technique

Towards Higher Oil Yield and Quality of Essential Oil Extracted from Aquilaria malaccensis Wood via the Subcritical Technique

Production of Valuable Materials from Sago Bark Using Subcritical Water Treatment

COSMO-RS-Based Screening of Antisolvents for the Separation of Sugars from Ionic Liquids: Experimental and Molecular Dynamic Simulations

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