Hydrothermal and microwave assisted alkali pretreatment for fractionation of arecanut husk

Singh, Ramkrishna; Bhuyan, Kaveri; Banerjee, Jhumur; Muir, Jane G.; Arora, Amit

doi:10.1016/j.indcrop.2017.03.017

Cited by 45 publications

(21 citation statements)

References 40 publications

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“…These effects were in accordance with those obtained in microwave-assisted pretreatment of Arecanut husk. 36 This could be attributed to the effect of alkali on linkages between lignin and hemicellulose. Alkali at mild concentrations facilitates cleavage of ether and ester bonds in the lignocellulosic biomass.…”

Section: Effect Of Alkali Concentrationmentioning

confidence: 99%

“…Solvent volume plays an important role in determining the rate of delignification of biomass. 36,39 Therefore, in the present study, the influence of liquid solid ratio (LSR) of 10-20 mL/g on delignification of biomass was evaluated. From the figure (Figure 3c,e, f), it was evident that the delignification increased linearly with LSR upto 16 mL/g.…”

Section: Effect Of Liquid-solid Ratiomentioning

confidence: 99%

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Process optimization of microwave‐assisted alkali pretreatment for enhanced delignification of Prosopis juliflora biomass

Alexander¹,

Innasimuthu²,

Rajaram³

et al. 2019

Env Prog and Sustain Energy

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This study reports on the delignification of Prosopis juliflora biomass using microwaveassisted alkaline pretreatment. Response surface methodology was employed to analyze the effect of process variables on delignification. Four independent process variables such as microwave irradiation power (270-450 W), microwave irradiation time (3-5 min), alkali concentration (0.75-1.25% wt/vol) and liquid to solid ratio (LSR; 10-20 mL/g) were analyzed. A second-order nonlinear equation was developed to validate the model. The experimental results suggested that all the variables exhibited a similar response. The developed model was statistically valuated using analysis of variance. The optimum conditions determined from the study were as follows: microwave power of 360 W, irradiation time of 4.40 min, alkali concentration of 1.24% wt/vol and LSR of 13.16 mL/g. Maximum delignification of 75.12% was obtained using microwave-assisted alkali pretreatment method. The delignified Prosopis juliflora biomass was characterized using scanning electron microscopy and Fourier transform infrared spectroscopy studies. It was confirmed that microwave-assisted alkali pretreatment for a short duration facilitated maximum removal of lignin from biomass. The present study, therefore, helps in developing a suitable strategy both for satisfying the energy need and management of the exotic weed.

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Section: Effect Of Alkali Concentrationmentioning

confidence: 99%

Section: Effect Of Liquid-solid Ratiomentioning

confidence: 99%

Process optimization of microwave‐assisted alkali pretreatment for enhanced delignification of Prosopis juliflora biomass

Alexander¹,

Innasimuthu²,

Rajaram³

et al. 2019

Env Prog and Sustain Energy

View full text Add to dashboard Cite

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“…Thunberg et al (1982) also studied the enzymatic depolymerization of heparin-related polysaccharides. Our main objective was to study the optimal time for the production of more sugar, and we refer to many reports in which 72 h is the time period used to degrade lignocellulose (Chen et al, 2018; Amiri, Karimi & Zilouei, 2014; Singh et al, 2017; Li et al, 2016). Periods longer or shorter than 72 h are not conducive to the production of sugar by hydrolysis with two enzymes.…”

Section: Discussionmentioning

confidence: 99%

“…Hydrolysis was performed for 72 h (Li et al, 2013) in a shaking incubator at 50 °C and 150 rpm (Wu et al, 2011; Zheng et al, 2018). Afterwards, the hydrolysates were centrifuged (10,000 rpm, 10 min) (Singh et al, 2017; Li et al, 2016), and the liquid fraction was collected for further experiments (Yan et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, the combination of physical and chemical processes is conducive to the disintegration of lignocellulosic materials and improvement of the hydrolysis efficiency. Singh et al (2017) studied the effectiveness of hydrothermal and microwave-assisted alkali pretreatment for the fractionation of areca nut husk. These researchers observed that the optimal conditions released 69.7% of the lignin, 83.5% of the hemicellulose and 69.2% of the cellulose.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of a pretreatment and hydrolysis process for the efficient recovery of recycled sugars and unknown compounds from agricultural sweet sorghum bagasse stem pith solid waste

Jiang

Liang

Zhou

et al. 2019

PeerJ

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BackgroundSweet sorghum bagasse (SSB), comprising both a dermal layer and pith, is a solid waste generated by agricultural activities. Open burning was previously used to treat agricultural solid waste but is harmful to the environment and human health. Recent reports showed that certain techniques can convert this agricultural waste into valuable products. While SSB has been considered an attractive raw material for sugar extraction and the production of value-added products, the pith root in the SSB can be difficult to process. Therefore, it is necessary to pretreat bagasse before conventional hydrolysis.MethodsA thorough analysis and comparison of various pretreatment methods were conducted based on physicochemical and microscopic approaches. The responses of agricultural SSB stem pith with different particle sizes to pretreatment temperature, acid and alkali concentration and enzyme dosage were investigated to determine the optimal pretreatment. The integrated methods are beneficial to the utilization of carbohydrate-based and unknown compounds in agricultural solid waste.ResultsAcid (1.5−4.5%, v/v) and alkali (5−8%, w/v) reagents were used to collect cellulose from different meshes of pith at 25–100 °C. The results showed that the use of 100 mesh pith soaked in 8% (w/v) NaOH solution at 100 °C resulted in 32.47% ± 0.01% solid recovery. Follow-up fermentation with 3% (v/v) acid and 6.5% (w/v) alkali at 50 °C for enzymolysis was performed with the optimal enzyme ratio. An analysis of the surface topography and porosity before and after pretreatment showed that both the pore size of the pith and the amount of exposed cellulose increased as the mesh size increased. Interestingly, various compounds, including 42 compounds previously known to be present and 13 compounds not previously known to be present, were detected in the pretreatment liquid, while 10 types of monosaccharides, including D-glucose, D-xylose and D-arabinose, were found in the enzymatic solution. The total monosaccharide content of the pith was 149.48 ± 0.3 mg/g dry matter.DiscussionAn integrated technique for obtaining value-added products from sweet sorghum pith is presented in this work. Based on this technique, lignin and hemicellulose were effectively broken down, amorphous cellulose was obtained and all sugars in the sweet sorghum pith were hydrolysed into monosaccharides. A total of 42 compounds previously found in these materials, including alcohol, ester, acid, alkene, aldehyde ketone, alkene, phenolic and benzene ring compounds, were detected in the pretreatment pith. In addition, several compounds that had not been previously observed in these materials were found in the pretreatment solution. These findings will improve the transformation of lignocellulosic biomass into sugar to create a high-value-added coproduct during the integrated process and to maximize the potential utilization of agricultural waste in current biorefinery processing.

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Microwaves Application to Food and Food Waste Processing

Barrera

Fito

Castro‐Giráldez

et al. 2022

Novel Technologies in Food Science

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Hydrothermal and microwave assisted alkali pretreatment for fractionation of arecanut husk

Cited by 45 publications

References 40 publications

Process optimization of microwave‐assisted alkali pretreatment for enhanced delignification of Prosopis juliflora biomass

Process optimization of microwave‐assisted alkali pretreatment for enhanced delignification of Prosopis juliflora biomass

Optimization of a pretreatment and hydrolysis process for the efficient recovery of recycled sugars and unknown compounds from agricultural sweet sorghum bagasse stem pith solid waste

Microwaves Application to Food and Food Waste Processing

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