Liquid hot water pretreatment on different parts of cotton stalk to facilitate ethanol production

Jiang, Wei; Chang, Senlin; Li, Hongqiang; Oleśkowicz-Popiel, Piotr; Xu, Jian

doi:10.1016/j.biortech.2014.11.023

Cited by 58 publications

(18 citation statements)

References 30 publications

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“…Kazan et al [2] and Mohan et al [25] suggested similar LHW operating time for optimum olive pomace and bamboo hydrolysis. Afterwards, the hydrolysate and the solid residue were separated by centrifugation at 4500 rpm and 25 °C for 1 h. The solid fraction was dried at 60 °C prior to the compositional analysis of their lignin, cellulose, and hemicellulose contents [26]. The supernatant was collected and analyzed for its composition in organic acids, sugars monomers, and oligomers.…”

Section: Methodsmentioning

confidence: 99%

“…Hydrolysis with hemicellulolytic and cellulolytic enzymes had also been commonly used for lignocellulose degradation [2, 24]. However, enzymatic hydrolysis is time consuming and is not enough to break down the hemicellulose and cellulose complex structures to simple sugars [2, 25, 26]. Interestingly, the hydrolysis with liquid hot water (LHW) , a physicochemical process using pressurized water, is picking up an expanding consideration as an environmentally friendly technique.…”

Section: Introductionmentioning

confidence: 99%

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Biorefinery cascade processing for creating added value on tomato industrial by-products from Tunisia

Kehili

Schmidt

Reynolds

et al. 2016

Biotechnol Biofuels

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BackgroundIn today’s consumer perception of industrial processes and food production, aspects like food quality, human health, environmental safety, and energy security have become the keywords. Therefore, much effort has been extended toward adding value to biowastes of agri-food industries through biorefinery processing approaches. This study focused, for the first time, on the valorization of tomato by-products of a Tunisian industry for the recovery of value-added compounds using biorefinery cascade processing.ResultsThe process integrated supercritical CO2 extraction of carotenoids within the oil fractions from tomato seeds (TS) and tomato peels (TP), followed by a batch isolation of protein from the residues. The remaining lignocellulosic matter from both fractions was then submitted to a liquid hot water (LHW) hydrolysis. Supercritical CO2 experiments extracted 5.79% oleoresin, 410.53 mg lycopene/kg, and 31.38 mg β-carotene/kg from TP and 26.29% oil, 27.84 mg lycopene/kg, and 5.25 mg β-carotene/kg from TS, on dry weights. Protein extraction yields, nearing 30% of the initial protein contents equal to 13.28% in TP and 39.26% in TS, revealed that TP and TS are a rich source of essential amino acids. LHW treatment run at 120–200 °C, 50 bar for 30 min showed that a temperature of 160 °C was the most convenient for cellulose and hemicellulose hydrolysis from TP and TS, while keeping the degradation products low.ConclusionsResults indicated that tomato by-products are not only a green source of lycopene-rich oleoresin and tomato seed oil (TSO) and of protein with good nutritional quality but also a source of lignocellulosic matter with potential for bioethanol production. This study would provide an important reference for the concept and the feasibility of the cascade fractionation of valuable compounds from tomato industrial by-products.Graphical abstractSchema of biorefinery cascade processing of tomato industrial by-products toward isolation of valuable fractions.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biorefinery cascade processing for creating added value on tomato industrial by-products from Tunisia

Kehili

Schmidt

Reynolds

et al. 2016

Biotechnol Biofuels

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“…Currently, physical or chemical or biological methods or their combinations are employed for biomass pretreatment. The most common biomass deconstruction methods includes physical (grinding/milling [2, 3]), chemical (acid/alkaline [4, 5], ionic liquids [6], subcritical and supercritical water, organosolv [7]), biological (white rot fungi [8] or laccase enzyme [9]), and combinations of these methods (hot water/autohydrolysis [10, 11], steam explosion [11], supercritical CO 2 [12] or ammonia fiber explosion [13]). Generally, combined pretreatment methods are preferred due to its better performance/efficiency in delignification compared to individual methods [14].…”

Section: Introductionmentioning

confidence: 99%

Delignification of corncob via combined hydrodynamic cavitation and enzymatic pretreatment: process optimization by response surface methodology

Thangavelu

Desikan

Taran

et al. 2018

Biotechnol Biofuels

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BackgroundRenewable liquid biofuel production will reduce crude oil import of India. To displace the huge quantity of fossil fuels used for energy production, this research was focused on utilization of unexploited low-cost agricultural residues for biofuel production. Corncobs are a byproduct of corn processing industry, and till now it is not utilized for biofuel production, eventhough it has high lignocellulosic concent. In this study, combined hydrodynamic cavitation and enzymatic (HCE) method was evaluated as a pretreatment method of corncob for biofuel production. The most significant process parameters namely (i) enzyme loading (3–10 U g−1), (ii) biomass loading (2.5–5.0%), and (iii) duration (5–60 min) were optimized and their effects on combined HCE pretreatment of corncob was studied through response surface methodology for lignin reduction, hemicellulose reduction and cellulose increase.ResultsThe highest lignin reduction (47.4%) was obtained in orifice plate 1 (OP1) under the optimized conditions namely biomass loading at 5%, enzyme loading at 6.5 U g−1 of biomass, and reaction duration of 60 min. The above tested independent variables had a significant effect on lignin reduction. The cavitational yield and energy consumption under the above-mentioned optimized conditions for OP1 was 3.56 × 10−5 g J−1 and 1.35 MJ kg−1, respectively.ConclusionsIt is evident from the study that HCE is an effective technology and requires less energy (1.35 MJ kg−1) than other biomass pretreatment methods.Electronic supplementary materialThe online version of this article (10.1186/s13068-018-1204-y) contains supplementary material, which is available to authorized users.

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“…The degree of acylation has been reported to be a crucial factor in cellulose hydrolysis . Liquid hot water pretreatment has found to be effective in removing the acetyl groups found in hemicellulose and converting them in to acetic acid (Jiang et al, 2015). The acetyl groups may inhibit enzyme activity by interfering in the hydrogen bond formation between cellulose and cellulose binding domains.…”

Section: Acetyl Groupsmentioning

confidence: 99%

“…This method does not require corrosion resistant reactors or chemicals and the formation of toxic compounds is almost absent (Jiang et al, 2015). The process is performed in a customized high pressure reactor.…”

Section: Hot Water Pre-treatmentmentioning

confidence: 99%

A comprehensive review on pre-treatment strategy for lignocellulosic food industry waste: Challenges and opportunities

Ravindran¹,

Jaiswal²

2016

Bioresource Technology

460

156

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Liquid hot water pretreatment on different parts of cotton stalk to facilitate ethanol production

Cited by 58 publications

References 30 publications

Biorefinery cascade processing for creating added value on tomato industrial by-products from Tunisia

Biorefinery cascade processing for creating added value on tomato industrial by-products from Tunisia

Delignification of corncob via combined hydrodynamic cavitation and enzymatic pretreatment: process optimization by response surface methodology

A comprehensive review on pre-treatment strategy for lignocellulosic food industry waste: Challenges and opportunities

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