Assessment of the structural factors controlling the enzymatic saccharification of rice straw cellulose

Seo, Dongmin; Sakoda, Akiyoshi

doi:10.1016/j.biombioe.2014.10.027

Cited by 14 publications

(6 citation statements)

References 28 publications

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“…The carbon and oxygen atoms typically originated from the natural fiber. The relatively high content of silica was commonly found in RS, and the value of 9.15% was consistent with other reports [27,28]. After pretreatment, the EDX spectra showed higher percentage of carbon than oxygen, which may reflect the cellulosic component [29].…”

Section: Edx Analysissupporting

confidence: 89%

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Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production

Phitsuwan

Permsriburasuk

Baramee

et al. 2017

International Journal of Polymer Science

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Rice straw (RS) is an abundant, readily available agricultural waste, which shows promise as a potential feedstock for Asian ethanol production. To enhance release of glucose by enzymatic hydrolysis, RS was pretreated with aqueous ammonia (27% w/w) at two pretreatment temperatures: room temperature and 60 ∘ C. Statistical analysis indicated similarity of enzymatic glucose production at both pretreatment temperatures after 3-day incubation. Chemical composition, FTIR, and EDX analyses confirmed the retention of glucan and xylan in the pretreated solid, but significant reduction of lignin (60.7% removal) and silica. SEM analysis showed the disorganized surfaces and porosity of the pretreated RS fibers, thus improving cellulose accessibility for cellulase. The crystallinity index increased from 40.5 to 52.3%, indicating the higher exposure of cellulose. With 10% (w/v) solid loadings of pretreated RS, simultaneous saccharification and fermentation yielded a final ethanol concentration of 24.6 g/L, corresponding to 98% of maximum theoretical yield. Taken together, aqueous ammonia pretreatment is an effective method to generate highly digestible pretreated RS for bioethanol production and demonstrates potential application in biorefinery industry.

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Section: Edx Analysissupporting

confidence: 89%

“…The silica content decreased about 3-fold, indicating that the pretreatment affected the silica layers. Possibly, the reduction of silica may be associated with lignin removal by pretreatment, as silica is complexed with lignin moieties in rice plant [28]. The silica-lignin matrix hinders cellulase reaction.…”

Section: Edx Analysismentioning

confidence: 99%

Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production

Phitsuwan

Permsriburasuk

Baramee

et al. 2017

International Journal of Polymer Science

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“…The untreated sample ( Figure 4 ) showed the RS fragments with different dimensions that reveals the original structure of the RS tissue. This has numerous vascular bundles in different layers, consisting of a waxy cuticle, silicate epidermis, cortex (collenchyma), a thick lignified layer (sclerenchyma) and ground tissue (parenchyma) that contained cellulose microfibrils covered with lignin and hemicellulose [ 38 ]. Most of the particles resulting from the milling operation exhibit the fibrillar nature of the original tissue.…”

Section: Resultsmentioning

confidence: 99%

Application of Ultrasound Pre-Treatment for Enhancing Extraction of Bioactive Compounds from Rice Straw

Freitas

González‐Martínez

Chiralt

2020

Foods

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The extraction of water-soluble bioactive compounds using different green methods is an eco-friendly alternative for valorizing agricultural wastes such as rice straw (RS). In this study, aqueous extracts of RS (particles < 500 µm) were obtained using ultrasound (US), reflux heating (HT), stirring (ST) and a combination of US and ST (USST) or HT (USHT). The extraction kinetics was well fitted to a pseudo-second order model. As regards phenolic compound yield, the US method (342 mg gallic acid (GAE). 100 g−1 RS) was more effective than the ST treatment (256 mg GAE·100 g−1 RS), reaching an asymptotic value after 30 min of process. When combined with HT (USHT), the US pre-treatment led to the highest extraction of phenolic compounds from RS (486 mg GAE·100 g−1 RS) while the extract exhibited the greatest antioxidant activity. Furthermore, the USHT extract reduced the initial counts of Listeria innocua by 1.7 logarithmic cycles. Therefore, the thermal aqueous extraction of RS applying the 30 min US pre-treatment, represents a green and efficient approach to obtain bioactive extracts for food applications.

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“…In vitro digestibility has received extensive acceptance as an evaluation index on the nutritional value of ruminant roughages (Rymer et al ., 2005; Zhao et al ., 2021). Given that the digestibility is negatively associated with the content of lignin and silica, rice straw silages usually present poor in vitro digestibility (Seo and Sakoda, 2014). In this regard, the IVDMD, IVNDFD and IVADFD of all silages were below 0.4.…”

Section: Discussionmentioning

confidence: 99%

Substitution of various agricultural by-products improves fermentation profile and in vitro digestibility of rice straw silage

Chen

Li²,

Dong³

et al. 2022

J. Agric. Sci.

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This experiment was conducted to evaluate the impact of substituting rice straw with citrus pulp (CRP), sweet potato peels (SPP) and vines (SPV) on fermentation quality and in vitro digestibility when ensiled with or without wet brewers' grains (WBG). Seven treatments were set as follows: (i) rice straw only (control); (ii) 800 g rice straw/kg + 200 g CRP/kg (RC); (iii) 720 g rice straw/kg + 180 g CRP/kg + 100 g WBG/kg (RC+); (iv) 800 g rice straw/kg + 200 g SPP/kg (RP); (v) 720 g rice straw + 180 g SPP/kg + 100 g WBG/kg (RP+); (vi) 800 g rice straw/kg + 200 g SPV/kg (RV); (vii) 720 g rice straw/kg + 180 g SPV/kg + 100 g WBG/kg (RV+). After ensiling for 3, 7, 14, 30 and 60 days, silos were opened for fermentation profile, aerobic stability and in vitro parameter analyses. All substitution types improved fermentation quality, characterized by significantly lower pH and NH3-N content, higher lactic acid content and V-scores. WBG application promoted hetero-fermentation and significantly increased DM losses, acetic acid and ethanol contents. After 60 days of ensiling, the NDF, ADF and cellulose contents in mixed silages significantly decreased compared to control. During aerobic exposure, WBG application significantly prolonged aerobic stability. SPV substitution significantly improved in vitro digestibility of dry matter, NDF and ADF. In conclusion, the SPP substitution combined with WBG application was recommended as a result of the optimal balance of fermentation quality, aerobic stability and in vitro digestibility.

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Assessment of the structural factors controlling the enzymatic saccharification of rice straw cellulose

Cited by 14 publications

References 28 publications

Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production

Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production

Application of Ultrasound Pre-Treatment for Enhancing Extraction of Bioactive Compounds from Rice Straw

Substitution of various agricultural by-products improves fermentation profile and in vitro digestibility of rice straw silage

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