Rice Straws With Different Cell Wall Components Differ on Abilities of Saccharification

Chen, Chen; Deng, Xiaoxiao; Kong, Weilong; Qaseem, Mirza Faisal; Zhao, Shuai; Li, Yangsheng; Wu, Ai‐Min

doi:10.3389/fbioe.2020.624314

Cited by 22 publications

(3 citation statements)

References 36 publications

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“…The chemical composition of RS changes according to the rice variety [64], soil characteristics [65] and fertilization methods [66]. Conversely, moisture content simply depends on how long the straw is left on the field.…”

Section: Rice Straw Characteristics and Biogas Productionmentioning

confidence: 99%

A Mass Balance-Based Method for the Anaerobic Digestion of Rice Straw

et al. 2023

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Current rice straw disposal practices have serious repercussions on the environment and, in addition, do not consider its energy potential. On the contrary, the anaerobic digestion of rice straw makes it possible to produce renewable energy and to reintroduce into the soil the nutrients present in the digestate, at the same time, reducing greenhouse gas emissions from paddies. For rice straw of different geographical origin, by applying a mass balance method to the digester, the minimum requirements in terms of conditioners (nitrogen, phosphorus and potassium) and water, which allow obtaining the maximum production of methane, were calculated. The results obtained show that after the first 30 days (hydraulic retention time) for each ton of rice straw digested, the daily water consumption varies considerably from one country to another, from a minimum value of 1.5 m3/d to a maximum of 4.3 m3/d. After the same time, the addition of nitrogen and phosphorus is only required for the optimal anaerobic digestion of Indian rice straw. The low presence of these elements in Indian straw requires an addition of 3 kg/d of urea and 1.5 kg/d of superphosphate to compensate for the lack of nitrogen and phosphorus, respectively. In all the examined cases, the concentration of potassium, even if higher than the optimal value, does not reach levels that can significantly affect the methane production.

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Section: Rice Straw Characteristics and Biogas Productionmentioning

confidence: 99%

A Mass Balance-Based Method for the Anaerobic Digestion of Rice Straw

et al. 2023

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“…As a lignocellulose material, rice straw is composed of lignin, hemicellulose, and cellulose at percent compositions of 5–24%, 19–27%, and 32–47%, respectively (Kobkam et al 2018 ). Like other lignocellulose feedstock, rice straw structure is complex with lignin providing a “glue-like” adhesion within and around intricate lattice of cellulose and hemicellulose (Ceballos 2017 ; Chen et al 2021 ). Lignin is comprised of cross-linked polymers of phenolic monomers (Yang et al 2022 ).…”

Section: Introductionmentioning

confidence: 99%

Hydrolysis of ionic liquid–treated substrate with an Iocasia fonsfrigidae strain SP3-1 endoglucanase

Heng,

Sutheeworapong,

Wangnai

et al. 2024

Appl Microbiol Biotechnol

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Recently, we reported the discovery of a novel endoglucanase of the glycoside hydrolase family 12 (GH12), designated IfCelS12A, from the haloalkaliphilic anaerobic bacterium Iocasia fonsfrigidae strain SP3-1, which was isolated from a hypersaline pond in the Samut Sakhon province of Thailand (ca. 2017). IfCelS12A exhibits high substrate specificity on carboxymethyl cellulose and amorphous cellulose but low substrate specificity on b-1,3;1,4-glucan. Unlike some endoglucanases of the GH12 family, IfCelS12A does not exhibit hydrolytic activity on crystalline cellulose (i.e., Avicel™). High-Pressure Liquid Chromatography (HPLC) and Thin Layer Chromatography (TLC) analyses of products resulting from IfCelS12-mediated hydrolysis indicate mode of action for this enzyme. Notably, IfCelS12A preferentially hydrolyzes cellotetraoses, cellopentaoses, and cellohexaoses with negligible activity on cellobiose or cellotriose. Kinetic analysis with cellopentaose and barely b-d-glucan as cellulosic substrates were conducted. On cellopentaose, IfCelS12A demonstrates a 16-fold increase in activity (KM = 0.27 mM; kcat = 0.36 s−1; kcat/KM = 1.34 mM−1 s−1) compared to the enzymatic hydrolysis of barley b-d-glucan (KM: 0.04 mM, kcat: 0.51 s−1, kcat/KM = 0.08 mM−1 s−1). Moreover, IfCelS12A enzymatic efficacy is stable in hypersaline sodium chlorids (NaCl) solutions (up to 10% NaCl). Specifically, IfCel12A retains notable activity after 24 h at 2M NaCl (10% saline solution). IfCelS12A used as a cocktail component with other cellulolytic enzymes and in conjunction with mobile sequestration platform technology offers additional options for deconstruction of ionic liquid–pretreated cellulosic feedstock. Key points • IfCelS12A from an anaerobic alkaliphile Iocasia fronsfrigidae shows salt tolerance • IfCelS12A in cocktails with other enzymes efficiently degrades cellulosic biomass • IfCelS12A used with mobile enzyme sequestration platforms enhances hydrolysis

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“…The rice plant contains forty to sixty percent of its weight in rice straw, an agricultural waste. Rice straw contains 38-43% cellulose, 2-26% hemicellulose, and 15-20% lignin, depending on the variety and region [5,6]. Despite being one of the many crops that are commonly grown throughout the world, burning rice straw in open fields has a detrimental effect on the environment.…”

Section: Introductionmentioning

confidence: 99%

Sodium Hydroxide Hydrothermal Extraction of Lignin from Rice Straw Residue and Fermentation to Biomethane

et al. 2023

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The purpose of the NaOH pretreatment of rice straw with a recycling strategy was to enhance the economic efficiency of producing biomethane. Anaerobic digestion is used for converting rice straw into biogas. In this work, 5% NaOH and rice straw mixed samples were autoclaved at 121 °C for 20 min for lignin removal. The NaOH black liquor was separated using filtration for the subsequent treatment cycle. The NaOH liquor was utilized in one more subsequent recycling procedure to test its ability to remove lignin from the rice straw. The 5% NaOH treatment results in a reduction in rice straw (RC) lignin of 73.6%. The lignin content of the recycled NaOH-filtrated rice straw samples (RCF1) was reduced by 55.5%. The 5% NaOH-treated rice straw sample yields a total cumulative biogas of 1452.4 mL/gVS, whereas the recycled NaOH-filtered (RCF1) samples generate 1125.2 mL/gVS after 30 days of incubation. However, after 30 days of incubation, the untreated rice straw (RCC) bottle produced a total of 285.5 mL/gVS of biogas. The total increase in methane output after NaOH treatment is 6–8 times greater, and the biogas yield improves by 80–124%. We show here that the recycled NaOH black solution has still the effectiveness to be used for successive pretreatment cycles to remove lignin and generate methane. In the meantime, the NaOH black solution contains useful materials (lignin, sugars, potassium, and nitrogen) that could be purified for commercial purposes, and more importantly recycling the NaOH solution decrease the chances of environmental pollution. Thus, recycling NaOH decreased chemical consumption, which would provide net benefits instead of using fresh NaOH solution, had a lower water consumption, and provided the prospect of producing an optimum yield of methane in anaerobic digestion. This method will decrease the chemical treatment costs for biomass pretreatment prior to anaerobic digestion. Recycling of NaOH solution and the integration of pretreatment reactors could be a novel bioprocessing addition to the current technology.

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Rice Straws With Different Cell Wall Components Differ on Abilities of Saccharification

Cited by 22 publications

References 36 publications

A Mass Balance-Based Method for the Anaerobic Digestion of Rice Straw

A Mass Balance-Based Method for the Anaerobic Digestion of Rice Straw

Hydrolysis of ionic liquid–treated substrate with an Iocasia fonsfrigidae strain SP3-1 endoglucanase

Sodium Hydroxide Hydrothermal Extraction of Lignin from Rice Straw Residue and Fermentation to Biomethane

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