Alkali-peroxide treatment of sugar cane bagasse. Effect of chemical charges on the efficiency of xylan isolation and susceptibility of bagasse to saccharification

Solier, Yamil Nahún; Mocchiutti, Paulina; Cabrera, María Noel; Saparrat, Mario Carlos Nazareno; Zanuttini, Miguel Angel Mario; Inalbon, María Cristina

doi:10.1007/s13399-020-00776-0

Cited by 10 publications

(3 citation statements)

References 26 publications

(40 reference statements)

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“…The chitosan was dissolved in diluted acetic acid to reach a concentration of 2.5 g/L, following the method described by Schnell et al [35]. Xylan (Xyl) was obtained by alkaline extraction from sugar cane bagasse according to Solier et al [36]. In brief, extractions were carried out at 50 • C and with a bagasse liquor ratio of 1:25, using an alkali charge of 40 % w/w on bagasse for 180 min.…”

Section: Methodsmentioning

confidence: 99%

Flocculation of Cellulose Microfiber and Nanofiber Induced by Chitosan–Xylan Complexes

Bastida,

Tarrés,

Aguado

et al. 2023

Nanomaterials

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This study aims to provide a comprehensive understanding of the key factors influencing the rheological behavior and the mechanisms of natural polyelectrolyte complexes (PECs) as flocculation agents for cellulose microfibers (CMFs) and nanofibers (CNFs). PECs were formed by combining two polyelectrolytes: xylan (Xyl) and chitosan (Ch), at different Xyl/Ch mass ratios: 60/40, 70/30, and 80/20. First, Xyl, Ch, and PEC solutions were characterized by measuring viscosity, critical concentration (c*), rheological parameter, ζ-potential, and hydrodynamic size. Then, the flocculation mechanisms of CMF and CNF suspensions with PECs under dynamic conditions were studied by measuring viscosity, while the flocculation under static conditions was examined through gel point measurements, floc average size determination, and ζ-potential analysis. The findings reveal that PEC solutions formed with a lower xylan mass ratio showed higher intrinsic viscosity, higher hydrodynamic size, higher z-potential, and a lower c*. This is due to the high molecular weight, charge, and gel-forming ability. All the analyzed solutions behave as a typical non-Newtonian shear-thinning fluid. The flocculation mechanisms under dynamic conditions showed that a very low dosage of PEC (between 2 and 6 mg PEC/g of fiber) was sufficient to produce flocculation. Under dynamic conditions, an increase in viscosity indicates flocculation at this low PEC dosage. Finally, under static conditions, maximum floc sizes were observed at the same PEC dosage where minimum gel points were reached. Higher PEC doses were required for CNF suspensions than for CMF suspensions.

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Section: Methodsmentioning

confidence: 99%

Flocculation of Cellulose Microfiber and Nanofiber Induced by Chitosan–Xylan Complexes

Bastida,

Tarrés,

Aguado

et al. 2023

Nanomaterials

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“…Its structure is commonly composed of β-(1,4)-xylose linkages, with side chains consisting mainly of α-D-glucuronic acid, 4-O-methyl-α-D-glucuronic acid, different sugar units (α-L-arabinofuranose, α-D-xylopyranose or α-D-galactopyranose), and several substituents such as acetyl, phenolic, and ferulic groups [17,18]. Hemicellulose, especially xylan, has been used as a polymer for the formulation of gels and thermoplastic materials [19,20]. Xylan has received special attention for the preparation of biosorbents used as a drug release agent, biomaterial for osteonecrosis treatment and conductive material, and hydrogel formulation effective for the adsorption of heavy metals such as Pd 2+ , Cd 2+ , and Zn 2+ [15].…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Eco-Friendly Adsorbent Cryogels Based on Xylan Derived from Coffee Residues

Quintero,

Osma,

Azimov

et al. 2024

Membranes

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Agricultural and animal farming practices contribute significantly to greenhouse gas (GHG) emissions such as NH3, CH4, CO2, and NOx, causing local environmental concerns involving health risks and water/air pollution. A growing need to capture these pollutants is leading to the development of new strategies, including the use of solid adsorbents. However, commonly used adsorbent materials often pose toxicity and negative long-term environmental effects. This study aimed to develop responsive eco-friendly cryogels using xylan extracted from coffee parchment, a typical residue from coffee production. The crosslinking in cryogels was accomplished by “freeze-thawing” and subsequent freeze-drying. Cryogels were characterized in terms of morphology by using scanning electron microscopy, porosity, and density by the liquid saturation method and also moisture adsorption and ammonia adsorption capacity. The analysis showed that the porosity in the cryogels remained around 0.62–0.42, while the apparent densities varied from 0.14 g/cm3 to 0.25 g/cm3. The moisture adsorption capacity was the highest at the highest relative humidity level (80%), reaching 0.25–0.43 g of water per gram of sample; the amount of water adsorbed increased when the xylan content in the cryogel increased up to 10% w/v, which was consistent with the hygroscopic nature of xylan. The ammonia adsorption process was modeled accurately by a pseudo-second-order equation, where the maximum adsorption capacity in equilibrium reached 0.047 mg NH3/g when xylan reached 10% w/v in cryogels, indicating a chemisorption process. The cryogels under investigation hold promise for ammonia adsorption applications and GHG separation, offering a sustainable alternative for gas-capturing processes.

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“…Following the deconstruction of pretreated plant biomass, hydrolysis of the obtained cellulose and hemicellulose is performed with endoglucanases, exoglucanases or cellobiohydrolases and β-glucosidase types of enzymes, such as those from fungal sources. The endoglucanases degrade the 1,4-glycosidic bonds within the internal amorphous cellulose, while the cellobiohydrolases act on the reducing or nonreducing ends of the chain; the disaccharide cellobiose and the trisaccharides, generated in the process to a lesser extent, are hydrolyzed by β-glucosidases, releasing glucose [4][5][6]. The suitable enzyme cocktail might be either commercial or produced from native fungal species, as will be discussed later in this review.…”

Section: Introductionmentioning

confidence: 99%

Potentials of Biomass Waste Valorization: Case of South America

et al. 2023

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Various surveys carried out by the government and scientific projects on the availability of direct and indirect waste biomass in South America have reported that Brazil and Colombia produce 97% of the total waste biomass in the region, directly obtained from their extensive plantations of sugarcane. In addition, Argentina generates 45% of the total indirect biomass, followed by Brazil, Peru, Chile and Paraguay. The major source of those residues comprises sub-products of the wood (43%) and alimentary industries (20% from sugarcane and 11% from tea). Meaningful quantities of agricultural waste originate from soybean and corn, as the continent produces 50% and 11% of the global harvest of these crops. The higher content of cellulose in eucalyptus and willow waste (49%), among woody residues, along with their low lignin levels, makes them more suitable for delignification and exploitation as a biorefinery feedstock. Regarding the remains of agroindustrial activities, sugarcane bagasse (53%), corn cob (40%), wheat straw (49%) and banana hulls (38%) are the remarkable ones. In this context, the latest research concerning the use of commercial enzymatic cocktails for cellulose and hemicellulose deconstruction and the consequent feedstock hydrolysis is reviewed. In addition, we introduce the potential applications of cellulases isolated from native Latin American microbiota explored by South American research groups.

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Alkali-peroxide treatment of sugar cane bagasse. Effect of chemical charges on the efficiency of xylan isolation and susceptibility of bagasse to saccharification

Cited by 10 publications

References 26 publications

Flocculation of Cellulose Microfiber and Nanofiber Induced by Chitosan–Xylan Complexes

Flocculation of Cellulose Microfiber and Nanofiber Induced by Chitosan–Xylan Complexes

Multifunctional Eco-Friendly Adsorbent Cryogels Based on Xylan Derived from Coffee Residues

Potentials of Biomass Waste Valorization: Case of South America

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