Stimulatory effect of in-situ detoxification on bioethanol production by rice straw

Zhang, Qiuzhuo; Huang, Huiqin; Han, Hwataik; Qiu, Zhen; Achal, Varenyam

doi:10.1016/j.energy.2017.06.099

Cited by 41 publications

(9 citation statements)

References 54 publications

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“…These microstructural changes caused by biotreatment of rice straw by Ochrobactrum oryzae BMP03 bacterial strain increase accessibility and enhance efficient hydrolysis of polysaccharides by reducing the barriers. Many researchers reported microstructural changes on rice straw and wheat straw samples caused by different microbes (Ma et al 2015;Zhang et al 2017;Yao et al 2018). This morphological observation strengthens the results of compositional analysis and confirms rice straw lignin degradation components by Ochrobactrum oryzae BMP03 bacteria strain.…”

Section: Sem Analysissupporting

confidence: 69%

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Biodelignification and hydrolysis of rice straw by novel bacteria isolated from wood feeding termite

2018

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In this study, two bacterial strains capable of degrading lignin, cellulose, and hemicellulose were isolated from wood feeding termite. The isolates were identified by 16S rRNA gene sequencing. A bacterium Ochrobactrum oryzae BMP03 capable of degrading lignin was isolated on alkali lignin medium and Bacillus sp. BMP01 strain capable of degrading cellulose and hemicellulose were isolated on carboxymethyl cellulose and xylan media. The efficiency of bacterial degradation was studied by evaluating the composition of rice straw both before and after degradation. The appearance of new cellulose bands at 1382, 1276, 1200, and 871 cm −1 , and the absence of former lignin bands at 1726, 1307, and 1246 cm −1 was observed after biodelignification. This was further confirmed by the formation of channeling and layering of the microstructure of biodelignified rice straw observed under electron microscope. Maximum lignin removal was achieved in separate biodelignification and hydrolysis process after the 14th day of treatment by Ochrobactrum oryzae BMP03 (53.74% lignin removal). Hydrolysis of the biodelignified rice straw released 69.96% of total reducing sugars after the 14th day hydrolysis by Bacillus sp. BMP01. In simultaneous delignification and hydrolysis process, about 58.67% of total reducing sugars were obtained after the 13th day of biotreatment. Separate delignification and hydrolysis process were found to be effective in lignin removal and sugar released than the simultaneous process. The bacteria, Bacillus sp. BMP01, has the ability to degrade hemicellulose and cellulose simultaneously. Overall, these results demonstrate that the possibility of rice straw bioconversion into reducing sugars by bacteria from termite gut.

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Section: Sem Analysissupporting

confidence: 69%

“…Therefore, the use of alternate energy sources is mandatory to solve the current problems caused by the use of fossil fuels. Currently, lignocellulose biomass attracts the attention of many researchers for biofuel production due to their sustainability and relative abundance (Ma et al 2015;Zhang et al 2017;Yao et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Biodelignification and hydrolysis of rice straw by novel bacteria isolated from wood feeding termite

2018

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“…Rice straw as a heterogeneous material could be used for diverse uses; as an organic fertilizer, it can improve the crop quality and biomass and also accelerate plant growth by providing the necessary nutrients [ 17 ]. Nowadays, due to the lignocellulose composition of its fibers and the fast reduction of fossil fuel-reserves as well as the negative environmental consequences resulting from the inflated utilisation of fossil fuels, rice straw was proved to be an excellent candidate for biogas production, either by pyrolysis processes or by other chemical treatments [ 18 , 19 , 20 ]. In addition, due to its multitude of functional groups, rice straw is an effective tool as a biosorbent for reducing heavy metals in aquatic environments [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Earthworms, Rice Straw, and Plant Interactions Change the Organic Connections in Soil and Promote the Decontamination of Cadmium in Soil

Elyamine

Moussa

Ismael

et al. 2018

IJERPH

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The joint effects of earthworms and crop straw on toxic metal speciation are not clear, and very limited information is available regarding the effects of their interaction on Cd mobility in Cd contaminated soil or in remediation processes involving plants. This study evaluated their impacts on Cd mobile form changes in soil and their effects on Cd uptake by plants. Treatments included both planted and unplanted-Cd-contaminated soil with or without rice straw and/or earthworms. The results revealed that earthworms, rice straw, and plant interactions change the Cd mobile forms in soil. The order of Cd concentration of different chemical forms was as follows: exchangeable > residual > bound to Fe-Mn oxide > bound to organic matter for earthworms, and exchangeable > bound to organic matter > residual > bound to Fe-Mn oxide for rice straw treatment, with a recovery rate of 96 ± 3%. The accumulation of Cd in plants increased in the presence of earthworms and decreased in the presence of rice straw. FT-IR spectra indicated that the degradation of rice straw increases C–O, C–O–H, C–H, and O–H functional groups which could complex with Cd ions. These findings highlighted that earthworms’ activities and crop straw can modify soil properties and structure and promote the remediation of heavy metal. This study suggests that the ecological context of remediation instead of being limiting on soil-earthworms-plant interaction, should integrate the natural resources forsaken which can provide a positive influence on both plant health and the remediation of heavy metal in contaminated soil.

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“…Whilst much research has been carried out on furans and lignin-derived phenolics, the important roles of such cinnamic acid derivatives as microbial inhibitors have been highlighted only recently. Several studies have explored the potential to enhance the capability of fermenting microorganisms such as yeasts and bacteria to metabolise such phenolics [ 11 , 12 ]. Sato and colleagues [ 13 ] have developed Saccharomyces cerevisiae using a forced evolutionary approach to increase tolerance to pCA and tFA inhibitors.…”

Section: Introductionmentioning

confidence: 99%

Release of cell wall phenolic esters during hydrothermal pretreatment of rice husk and rice straw

Collins

Elliston

et al. 2018

Biotechnol Biofuels

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BackgroundRice husk and rice straw represent promising sources of biomass for production of renewable fuels and chemicals. For efficient utilisation, lignocellulosic components must first be pretreated to enable efficient enzymatic saccharification and subsequent fermentation. Existing pretreatments create breakdown products such as sugar-derived furans, and lignin-derived phenolics that inhibit enzymes and fermenting organisms. Alkali pretreatments have also been shown to release significant levels of simple, free phenolics such as ferulic acid that are normally esterified to cell wall polysaccharides in the intact plant. These phenolics have recently been found to have considerable inhibitory properties. The aim of this research has been to establish the extent to which such free phenolic acids are also released during hydrothermal pretreatment of rice straw (RS) and rice husk (RH).ResultsRS and RH were subjected to hydrothermal pretreatments over a wide range of severities (1.57–5.45). FTIR analysis showed that the pretreatments hydrolysed and solubilised hemicellulosic moieties, leading to an enrichment of lignin and crystalline cellulose in the insoluble residue. The residues also lost the capacity for UV autofluorescence at pH 7 or pH 10, indicating the breakdown or release of cell wall phenolics. Saponification of raw RS and RH enabled identification and quantification of substantial levels of simple phenolics including ferulic acid (tFA), coumaric acid (pCA) and several diferulic acids (DiFAs) including 8-O-4′-DiFA, 8,5′-DiFA and 5,5′-DiFA. RH had higher levels of pCA and lower levels of tFA and DiFAs compared with RS. Assessment of the pretreatment liquors revealed that pretreatment-liberated phenolics present were not free but remained as phenolic esters (at mM concentrations) that could be readily freed by saponification. Many were lost, presumably through degradation, at the higher severities.ConclusionDifferences in lignin, tFA, DiFAs and pCA between RS and RH reflect differences in cell wall physiology, and probably contribute to the higher recalcitrance of RH compared with RS. Hydrothermal pretreatments, unlike alkali pretreatments, release cinnamic acid components as esters. The potential for pretreatment-liberated phenolic esters to be inhibitory to fermenting microorganisms is not known. However, the present study shows that they are found at concentrations that could be significantly inhibitory if released as free forms by enzyme activity.

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Stimulatory effect of in-situ detoxification on bioethanol production by rice straw

Cited by 41 publications

References 54 publications

Biodelignification and hydrolysis of rice straw by novel bacteria isolated from wood feeding termite

Biodelignification and hydrolysis of rice straw by novel bacteria isolated from wood feeding termite

Earthworms, Rice Straw, and Plant Interactions Change the Organic Connections in Soil and Promote the Decontamination of Cadmium in Soil

Release of cell wall phenolic esters during hydrothermal pretreatment of rice husk and rice straw

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