Ultrasound-assisted compatible in situ hydrolysis of sugarcane bagasse in cellulase-aqueous–N-methylmorpholine-N-oxide system for improved saccharification

Li, Qiang; Ji, Gengsheng; Tang, Yubin; Gu, Xu-Ding; Fei, Juan-Juan; Jiang, Hui‐Qing

doi:10.1016/j.biortech.2011.12.068

Cited by 57 publications

(24 citation statements)

References 35 publications

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“…This may be due to the synergistic effect of ultrasound and TiO 2 which caused the disintegration of carbohydrate-lignin linkage to release lignin and hemicellulose [18]. TiO 2 acts as a sonocatalyst because the TiO 2 particles intensify the hydroxyl radicals generation [19].…”

Section: Resultsmentioning

confidence: 99%

Mechanistic study on ultrasound assisted pretreatment of sugarcane bagasse using metal salt with hydrogen peroxide for bioethanol production

Ramadoss

Muthukumar

2016

Ultrasonics Sonochemistry

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This study presents the ultrasound assisted pretreatment of sugarcane bagasse (SCB) using metal salt with hydrogen peroxide for bioethanol production. Among the different metal salts used, maximum holocellulose recovery and delignification were achieved with ultrasound assisted titanium dioxide (TiO2) pretreatment (UATP) system. At optimum conditions (1% H2O2, 4 g SCB dosage, 60 min sonication time, 2:100 M ratio of metal salt and H2O2, 75°C, 50% ultrasound amplitude and 70% ultrasound duty cycle), 94.98 ± 1.11% holocellulose recovery and 78.72 ± 0.86% delignification were observed. The pretreated SCB was subjected to dilute acid hydrolysis using 0.25% H2SO4 and maximum xylose, glucose and arabinose concentration obtained were 10.94 ± 0.35 g/L, 14.86 ± 0.12 g/L and 2.52 ± 0.27 g/L, respectively. The inhibitors production was found to be very less (0.93 ± 0.11 g/L furfural and 0.76 ± 0.62 g/L acetic acid) and the maximum theoretical yield of glucose and hemicellulose conversion attained were 85.8% and 77%, respectively. The fermentation was carried out using Saccharomyces cerevisiae and at the end of 72 h, 0.468 g bioethanol/g holocellulose was achieved. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analysis of pretreated SCB was made and its morphology was studied using scanning electron microscopy (SEM). The compounds formed during the pretreatment were identified using gas chromatography-mass spectrometry (GC-MS) analysis.

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Section: Resultsmentioning

confidence: 99%

Mechanistic study on ultrasound assisted pretreatment of sugarcane bagasse using metal salt with hydrogen peroxide for bioethanol production

Ramadoss

Muthukumar

2016

Ultrasonics Sonochemistry

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“… and Li Q. et al . ) and therefore increasing the concentration of the alkaline solution could result in more lignin to be removed or opened. This, in turn, may enhance the enzyme's access to cellulose structure (Beukes and Pletschke ).…”

Section: Resultsmentioning

confidence: 99%

“… and Li Q. et al . ). The major drawbacks of some pretreatment techniques, particularly at low pH, are high temperature requirements and the formation of metabolic inhibitory products such as carboxylic acids, furfural, hydroxymethyl furfural and phenolic compounds.…”

Section: Introductionmentioning

confidence: 97%

Combining Ultrasound with Mild Alkaline Solutions as an Effective Pretreatment to Boost the Release of Sugar Trapped in Sugarcane Bagasse for Bioethanol Production

Eblaghi

Niakousari

Sarshar³

et al. 2015

J Food Process Engineering

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The aim of this work was to develop and optimize process parameters in ultrasound and sono‐assisted alkaline pretreatment of sugarcane bagasse prior to hydrolysis and bioethanol fermentation processes. Following the optimization of ultrasound time and temperature, the influence of concentration of NaOH solution was examined. The optimal condition in ultrasound pretreatment (35 kHz) was achieved at 5 min and 65C. Ultrasound pretreatment of bagasse prior to hydrolysis step resulted in increased sugar concentration from 3.62 g/L (control, 25C) to 5.78 g/L (65C, 5 min). The micromorphology and cellulose crystallinity for native and pretreated bagasse were investigated by scanning electron microscopy and X‐ray diffraction, respectively. The maximum glucan conversion and bioethanol production of 50% and 0.38 g/g glucose were achieved following sono‐assisted alkaline pretreatment (3% NaOH concentration), respectively. The findings indicate that sono‐assisted alkaline pretreated bagasse can be used as a potential feedstock in bioethanol production. Practical Applications Current bioethanol production uses food crops such as sugarcane and maize. Large amounts of sugar molecules are present in the lignocellulose of plant material and current research aims to “unlock” the fermentable sugars in agricultural or forestry wastes and residues. The objective of the present research was to find an optimum pretreatment method by combining ultrasound with various concentrations of mild alkaline solution in order to make use of a greater proportion of lignocellulose materials from the sugarcane bagasse for bioethanol production. The development of an efficient pretreatment to increase the cellulose digestibility and fermentability potential of biomass may be of interest in bioethanol industries.

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“…Additional favourable characteristics of NMMO pretreatment include high sugar yields, formation of low degradation products, high solvent recovery, and no adverse effect on the environment. Further, cellulase activity is not negatively affected by low concentrations (15-20% w/w) of International Journal of Chemical Engineering 13 NMMO, indicating the potential of application in continuous processes [235]. Aqueous NMMO has already being used on a host of biomass as a sole pretreatment method or in combination with others.…”

Section: Aqueous N-methylmorpholine-n-oxide (Nmmo)mentioning

confidence: 99%

“…Cellulose dissolves (without derivatization) in NMMO/H 2 O system and the hydrogen bonds in cellulose are disrupted in favour of new bonds between cellulose and solvent molecules [234], leading to swelling and increased porosity [235], as well as reduced degree of polymerization and crystallinity which improves enzymatic saccharification. Addition of boiled distilled water to pretreatment slurry containing dissolved biomass causes cellulose I to precipitate into cellulose II which is more reactive.…”

Section: Aqueous N-methylmorpholine-n-oxide (Nmmo)mentioning

confidence: 99%

Chemical Pretreatment Methods for the Production of Cellulosic Ethanol: Technologies and Innovations

Bensah

Mensah

2013

International Journal of Chemical Engineering

280

105

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Pretreatment of lignocellulose has received considerable research globally due to its influence on the technical, economic and environmental sustainability of cellulosic ethanol production. Some of the most promising pretreatment methods require the application of chemicals such as acids, alkali, salts, oxidants, and solvents. Thus, advances in research have enabled the development and integration of chemical-based pretreatment into proprietary ethanol production technologies in several pilot and demonstration plants globally, with potential to scale-up to commercial levels. This paper reviews known and emerging chemical pretreatment methods, highlighting recent findings and process innovations developed to offset inherent challenges via a range of interventions, notably, the combination of chemical pretreatment with other methods to improve carbohydrate preservation, reduce formation of degradation products, achieve high sugar yields at mild reaction conditions, reduce solvent loads and enzyme dose, reduce waste generation, and improve recovery of biomass components in pure forms. The use of chemicals such as ionic liquids, NMMO, and sulphite are promising once challenges in solvent recovery are overcome. For developing countries, alkalibased methods are relatively easy to deploy in decentralized, low-tech systems owing to advantages such as the requirement of simple reactors and the ease of operation.

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Ultrasound-assisted compatible in situ hydrolysis of sugarcane bagasse in cellulase-aqueous–N-methylmorpholine-N-oxide system for improved saccharification

Cited by 57 publications

References 35 publications

Mechanistic study on ultrasound assisted pretreatment of sugarcane bagasse using metal salt with hydrogen peroxide for bioethanol production

Mechanistic study on ultrasound assisted pretreatment of sugarcane bagasse using metal salt with hydrogen peroxide for bioethanol production

Combining Ultrasound with Mild Alkaline Solutions as an Effective Pretreatment to Boost the Release of Sugar Trapped in Sugarcane Bagasse for Bioethanol Production

Chemical Pretreatment Methods for the Production of Cellulosic Ethanol: Technologies and Innovations

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