Influence of Pretreatments on Crystallinity and Enzymatic Hydrolysis in Sugar Cane Residues

Pardo, Luz Marina Flórez; Salcedo, Jairo G.; Galán, Jorge E.

doi:10.1590/0104-6632.20190361s20180093

Cited by 26 publications

(3 citation statements)

References 36 publications

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“…The diffractogram also shows peaks at about 15.2° and 22.5° assigned, respectively to 101 and 200 of cellulose. Three peaks associated with wax are apparent at 004 (at 4.6°), 110 (at 21.5°), and 020 (at 23.8°) 69‐71 . A broad peak is attributed to amorphous cellulose, hemicellulose, lignin, and wax 72 .…”

Section: Resultsmentioning

confidence: 98%

Valorization of waste waxed corrugated cardboard via pyrolysis for recovering wax

Sotoudehnia

Mengistie

Alayat

et al. 2020

Env Prog and Sustain Energy

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Corrugated cardboard (CCB) comprises a substantial portion of municipal solid waste, of which ~5% is wax coated CCB (WCCB) to enhance its performance. WCCB cannot be recycled, making it a suitable resource to recover wax and produce char. The WCCB was characterized for its extractable wax, lignin, and carbohydrate contents and by thermogravimetric analysis to study its thermal degradation behavior. WCCB was preliminarily examined by pyrolysis‐gas chromatography–mass spectrometry to determine product composition. WCCB samples were then pyrolyzed in auger and tube reactors at 450, 500, and 550°C, and their pyrolysis wax‐oil and char products characterized. WCCB and char were subjected to proximate, ultimate, surface area, analyses. The highest char yield was 36% at 450°C, and the highest wax‐oil yield was 53% at 550°C in the tube reactor. The wax‐oil fraction contained mainly alkanes, alkenes, and dienes (C9–C36), and chain length decreased with pyrolysis temperature. This wax fraction could be recovered and used as bunker fuel (C12–C40) or further converted to diesel (C10–C20).

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Section: Resultsmentioning

confidence: 98%

Valorization of waste waxed corrugated cardboard via pyrolysis for recovering wax

Sotoudehnia

Mengistie

Alayat

et al. 2020

Env Prog and Sustain Energy

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“…Hence, mechanical-enzymatic procedures can enhance the extraction efficiency and nutritional effect of DF, but the benefit depends highly on the initial accessibility of DF components for the enzymes. The crystallinity index might serve as an indicator for the accessibility of cellulose since it reflects the proportion of amorphous regions, which are the enzymatic attacking points [114]. Hence, DF with high crystallinity index is likely to benefit from a physical pre-treatment, whereas DF with low crystallinity might not require the mechanical opening of the fiber matrix, and further solubilization by a subsequent enzymatic hydrolysis can lead to partial structural collapse of the insoluble matrix and thus impairment of techno-functionality.…”

Section: Df Sourcementioning

confidence: 99%

Relationship between Physicochemical, Techno-Functional and Health-Promoting Properties of Fiber-Rich Fruit and Vegetable By-Products and Their Enhancement by Emerging Technologies

Manthei,

López-Gámez,

Martín-Belloso

et al. 2023

Foods

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The preparation and processing of fruits and vegetables produce high amounts of underutilized fractions, such as pomace and peel, which present a risk to the environment but constitute a valuable source of dietary fiber (DF) and bioactive compounds. The utilization of these fiber-rich products as functional food ingredients demands the application of treatments to improve their techno-functional properties, such as oil and water binding, and health-related properties, such as fermentability, adsorption, and retardation capacities of glucose, cholesterol, and bile acids. The enhancement of health-promoting properties is strongly connected with certain structural and techno-functional characteristics, such as the soluble DF content, presence of hydrophobic groups, and viscosity. Novel physical, environmentally friendly technologies, such as ultrasound (US), high-pressure processing (HPP), extrusion, and microwave, have been found to have higher potential than chemical and comminution techniques in causing desirable structural alterations of the DF network that lead to the improvement of techno-functionality and health promotion. The application of enzymes was related to higher soluble DF content, which might be associated with improved DF properties. Combined physical and enzymatic treatments can aid solubilization and modifications, but their benefit needs to be evaluated for each DF source and the desired outcome.

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“…Additionally, a strong positive correlation between CrI and enzymatic saccharification glucose yield (TGY based on TGC) was observed using both linear (R 2 = 0.95) and polynomial (R 2 = 1.00) models, as presented in Figure 3(a). Higher CrI values were associated with improved enzymatic saccharification of OPEFB, while biomasses with lower CrI values were more resistant to enzymatic hydrolysis (Pardo et al, 2019). Hence, the enzymatic saccharification of OPEFB was significantly improved by increasing the amorphous cellulose region, which was achieved by autohydrolysis coupled with the removal of both hemicellulose and lignin, resulting in a cellulose conversion rate of more than 90% to glucose.…”

Section: Structural Characterisation Of Biomasses By Fundamental Inst...mentioning

confidence: 99%

Integration of Multiple Fundamental Instrumental Analyses to Understand the Key Factors for Enhancing Enzymatic Saccharification of Oil Palm (Elaeis guineensis) Empty Fruit Bunch by Aqueous Pretreatments

Hemashini,

Lee,

Goh

et al. 2023

Preprint

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Simple aqueous pretreatments were performed on oil palm empty fruit bunch (OPEFB) to enhance its enzymatic digestibility by the cellulolytic enzyme. Autohydrolysis, acid and alkaline pretreatments were conducted at appropriate temperatures for 45 minutes with a solid: liquor ratio of 1:7. The refined pretreated OPEFBs were enzymatically saccharified at a fixed condition of 50°C, pH 4.8 for 48 hours. Besides chemical composition analysis, various changes in biomass during pretreatments were also evaluated using the fundamental instrumental analyses namely HPLC, FTIR, SEM, XRD, Py-GCMS and XPS. Autohydrolysed biomass achieved the maximum (> 99.9%) enzymatic saccharification/total glucose yield (TGY), attributed to 77% hemicellulose and 24% lignin removals, with only 16% cellulose loss. The crystallinity index was significantly correlated with TGY, but morphological analysis, S/G ratio of lignin, and O/C ratio were irrelevant. The key TGY-enhancing factors of pretreatment were unable to be identified by any single instrumental analysis. Determining the chemical composition of the biomass remains the primary fundamental analysis to understand the requirement for improving enzymatic yield.

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Influence of Pretreatments on Crystallinity and Enzymatic Hydrolysis in Sugar Cane Residues

Cited by 26 publications

References 36 publications

Valorization of waste waxed corrugated cardboard via pyrolysis for recovering wax

Valorization of waste waxed corrugated cardboard via pyrolysis for recovering wax

Relationship between Physicochemical, Techno-Functional and Health-Promoting Properties of Fiber-Rich Fruit and Vegetable By-Products and Their Enhancement by Emerging Technologies

Integration of Multiple Fundamental Instrumental Analyses to Understand the Key Factors for Enhancing Enzymatic Saccharification of Oil Palm (Elaeis guineensis) Empty Fruit Bunch by Aqueous Pretreatments

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