María Cristina Area | Universidad Nacional de Misiones (original) (raw)

Papers by María Cristina Area

Research paper thumbnail of Efecto del control de malezas y fertilización sobre pulpas CMP de álamo

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Research paper thumbnail of Investigación: Obtención de biopolietileno 2G a partir de aserrín de pino

El Papel: revista internacional de la fabricación de pasta y papel, 2020

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Research paper thumbnail of Second-generation bioethanol from industrial wood waste of South American species

Biofuel research journal, Sep 1, 2017

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Research paper thumbnail of Toward the use of mixed microbial cultures for the biological production of adipic and levulinic acid

Frontiers in Microbiology

Biological synthesis of high added-value compounds like adipic acid (AA), levulinic acid (LA), or... more Biological synthesis of high added-value compounds like adipic acid (AA), levulinic acid (LA), or polyhydroxybutyrate (PHB) using pure culture has been separately reported. However, pure culture requires sterile conditions and the use of specific carbon sources resulting in high operating costs. Different alternatives based on the use of mixed microbial cultures (MMC) have been explored to resolve this problem. MMC have been widely reported for the production of PHB, but scarcely reported for LA production and never for AA synthesis. This work presents a novel strategy for the co-production of AA LA, and PHB using MMC. The strategy consists in selecting an MMC producer of AA, LA and PHB from an inoculum obtained from a wastewater treatment plant, which is then subjected to the feast and famine culture strategy in a sequential batch reactor, coupled with a batch reactor step to enhance the accumulation of AA and LA. The results showed that the MMC could produce a 16 ± 2, 23 ± 1 and 5...

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Research paper thumbnail of Process Design for Value-Added Products in a Biorefinery Platform from Agro and Forest Industrial Byproducts

Polymers

Agroforestry wastes are industrial byproducts available locally such as eucalyptus sawdust (EUC) ... more Agroforestry wastes are industrial byproducts available locally such as eucalyptus sawdust (EUC) and sugarcane bagasse (SCB). These byproducts can be used as lignocellulosic raw materials to produce high-value products. This study is a techno–economic analysis of four potential scenarios to produce polyhydroxybutyrate (PHB) and levulinic acid (LA) from hemicellulosic sugars by a fermentative pathway in a biomass waste biorefinery. Mass and energy balances were developed, and technical and economic assessments were carried out to obtain gas, char, and tar from residual solids from autohydrolysis treatment. It was determined that microbial culture could be an attractive option for added-value product production. More than 1500 t/year of PHB and 2600 t/year of LA could be obtained by the proposed pathways. Microbial and enzymatic conversion of LA from sugars could significantly improve energy consumption on the conversion strategy. The products from solid residual valorization (char an...

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Research paper thumbnail of Strategy for biological co-production of levulinic acid and polyhydroxyalkanoates by using mixed microbial cultures fed with synthetic hemicellulose hydrolysate

Bioresource Technology

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Research paper thumbnail of Technological and economic barriers of industrial-scale production of nanocellulose

Green Nanomaterials for Industrial Applications

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Research paper thumbnail of Caracterización morfológica de las traqueidas de pino híbrido de rápido crecimiento

Maderas. Ciencia y tecnología

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Research paper thumbnail of Towards biodegradable barrier packaging: Production of films for single-use primary food liquid packaging

BioResources

This research aimed to obtain bio-degradable microfibrillated cellulose (MFC) films from a pine s... more This research aimed to obtain bio-degradable microfibrillated cellulose (MFC) films from a pine sawdust pulp for use as liquid containers. The films were combined with food-grade polyols (sorbitol, glycerol, and mannitol) to improve the hydrophobicity and provide barrier properties. Pine sawdust (a by-product of primary wood industrialization, highly available, and inexpensive) was treated with soda-ethanol and a 2-stage oxygen sequence. The resulting pulps were mechanically fibrillated to produce MFC with a disk refiner. The polyols were added to improve crosslinking and achieve a plasticizing effect. The films were dried at 25, 50, and 60 °C. The mechanical and barrier properties (tensile strength, elongation, vapor permeability, and water absorption), the crystallinity, and the transparency of the films were evaluated. Total migration tests were carried out to verify the compliance of the films with current regulations. Finally, the film’s biodegradation properties in soil under ...

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Research paper thumbnail of Integrating the new age of bioeconomy and Industry 4.0 into biorefinery process design

BioResources

Manufacturing processes and their economy are dramatically evolving due to machinery and digital ... more Manufacturing processes and their economy are dramatically evolving due to machinery and digital control improvements. Artificial intelligence, big data analytics, and the Internet of Things are key tools for this new industrial revolution era based on Industry 4.0. Bioeconomy and circular economy concepts have appeared in the forest, agriculture, food, pharmaceutical, pulp and paper, chemical, biotechnological, and energy areas, etc., to achieve sustainable economic growth development via biomass valorization in a biorefinery platform. Biorefinery process development at an industrial scale requires the previous design and assessment of processes and technologies. Therefore, economic, environmental, and social factors should be evaluated to prevent the failure in one of these issues that could affect the performance of the others. With a growing interest in sustainable economic development, there is a need to incorporate new technologies early enough in the process design. This stud...

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Research paper thumbnail of Obtaining xylitol by hydrolysis-hydrogenation of liquors derived from sugarcane bagasse

Chemical Industry and Chemical Engineering Quarterly

This work presents the study of heterogeneous catalysis of sugarcane bagasse hydrothermal treatme... more This work presents the study of heterogeneous catalysis of sugarcane bagasse hydrothermal treatment spent liquors using a sulfonated resin. Besides, results were compared with those obtained by a conventional route using sulfuric acid as a homogeneous catalyst. Heterogeneous catalysis is suitable for the hydrolysis of sugarcane bagasse hydrothermal liquors under mild conditions (100?C and 6 h). The obtained maximum xylose yield was 82% due to furfural formation, which causes a xylose selectivity drop. The hydrogenation of this xylose-rich liquor at 100 ?C and 3 MPa of hydrogen pressure employing a supported Ni/?-Al2O3 produced the total conversion of xylose with a selectivity towards xylitol of 100% by using a catalyst to xylose mass ratio of 0.5. Heterogeneous catalysis in a two-step route (hydrolysis and hydrogenation) constitutes an outstanding alternative to producing xylitol from sugarcane bagasse hydrothermal spent liquors since materials can be easily separated and reused in ...

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Research paper thumbnail of Tratamiento con ozono de efluentes para eliminar la materia orgánica refractaria

PULL Norte, Sep 1, 2016

En el marco del proyecto «Biorrefinería a partir de residuos de industrialización primaria de la ... more En el marco del proyecto «Biorrefinería a partir de residuos de industrialización primaria de la madera»impulsado por el Instituto de Materiales de Misiones (IMaM) en Argentina, se probaron diferentes procesosde oxidación avanzada (POA) para reducir las concentraciones de compuestos presentes en efluentesresultantes del procesamiento químico de biomasa (en este caso, compuestos recalcitrantes producidos porla fabricación de pulpa quimimecánica)En el marco del proyecto «Biorrefinería a partir de residuos de industrialización primaria de la madera» impulsado por el Instituto de Materiales de Misiones (IMaM) en Argentina, se probaron diferentes procesos de oxidación avanzada (POA) para reducir las concentraciones de compuestos presentes en efluentes resultantes del procesamiento químico de biomasa (en este caso, compuestos recalcitrantes producidos por la fabricación de pulpa quimimecánica).Fil: Cardozo, Alejandro Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Materiales de Misiones. Universidad Nacional de Misiones. Facultad de Ciencias Exactas Químicas y Naturales. Instituto de Materiales de Misiones; ArgentinaFil: Covinich, Laura Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Materiales de Misiones. Universidad Nacional de Misiones. Facultad de Ciencias Exactas Químicas y Naturales. Instituto de Materiales de Misiones; ArgentinaFil: Area, Maria Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Materiales de Misiones. Universidad Nacional de Misiones. Facultad de Ciencias Exactas Químicas y Naturales. Instituto de Materiales de Misiones; ArgentinaFil: Felissia, Fernando Esteban. Universidad Nacional de Misiones; Argentin

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Research paper thumbnail of Investigación: Fraccionamiento de aserrín de pino destinado a una biorrefinería forestal

El Papel: revista internacional de la fabricación de pasta y papel, 2017

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Research paper thumbnail of Evaluación de Cepas Fermentativas en la Hidrólisis y Fermentación Simultáneas (SSF) de Cascarilla de Arroz para la Producción de Bioetanol

The decrease in oil reserves worldwide and environmental problems caused by its use, lead to find... more The decrease in oil reserves worldwide and environmental problems caused by its use, lead to finding new renewable and less polluting alternatives.This work presents the study of the behavior of both celobiosas and cellulase enzymes, together with strains of Saccharomyces cerevisiae, Candida kefyr, Candida tropicalis and Candida guilliermondii, specifically in the process of simultaneous hydrolysis and fermentation (SSF) conducted at 35 °C to produce bioethanol from the carbohydrates of rice husks. This process seeks hydrolyze the cellulose and immediately utilize of fermentable sugars, overcoming the difficulty of the difference between the optimum temperature for the performance of enzyme (50°C) and yeast (25°C to 35°C). Rice husk was pretreated with an acid-alkaline sequence to achieve the separation of carbohydrates.The best yields to bioethanol were obtained with Saccharomyces cerevisiae (68%) and Candida kefyr (75%).

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Research paper thumbnail of Calidad de papel artesanal a partir de fibras no convencionales de cinco especies colombianas

espanolLa produccion de papel a partir de fibras de plantas anuales o de residuos agroindustriale... more espanolLa produccion de papel a partir de fibras de plantas anuales o de residuos agroindustriales es una alternativa rentable para paises con escasos recursos madereros. Estas fibras pueden ser empleadas para obtener diferentes calidades de papel artesanal. El objetivo de este estudio fue evaluar la potencialidad de cinco tipos de fibras no convencionales de Colombia (limoncillo, canelo, bambu, papayo y fique) para la fabricacion de papel artesanal mediante la caracterizacion microscopica de estas fibras y la determinacion de las propiedades fisico-mecanicas y opticas del papel artesanal obtenido. Las propiedades papeleras resultaron en general, mas bajas que las propiedades de pulpas quimicas convencionales (similares a las de una pulpa quimimecanica de eucaliptos). La mejor forma de utilizar estas fibras en papeles artesanales es elaborar hojas de gramajes superiores a 100 g/m2 y utilizarlas sin blanquear, aprovechando su aspecto rustico y coloracion natural para la fabricacion d...

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Research paper thumbnail of Influence of the Chemical Composition on the Enzymatic Hydrolysis of Hot Water and Organosolv Pretreated Sugarcane Bagasse

Waste and Biomass Valorization, 2019

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Research paper thumbnail of Influence of initial chemical composition and characteristics of pulps on the production and properties of lignocellulosic nanofibers

International Journal of Biological Macromolecules, 2019

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Research paper thumbnail of The challenge of converting biomass polysaccharides into levulinic acid through heterogeneous catalytic processes

Biofuels, Bioproducts and Biorefining, 2019

The differences between a biorefinery and an oil refinery are determined by the higher oxygen con... more The differences between a biorefinery and an oil refinery are determined by the higher oxygen content of the biorefinery's biomass, its high degree of functionalization, its low thermal stability, its polar components, which are mostly acidic, its highly heterogeneous structure, and its quality variation as result of genotypic and phenotypic characteristics. Levulinic acid (LA) is one of the main high value‐added chemicals that can be produced from lignocellulosic biomass as raw material. The main challenges for the conversion of lignocellulosic biomass to levulinic acid are related to the improvement of the technologies to obtain a pure and cost‐competitive product, the design and use of efficient heterogeneous catalysts, and the improvements in the selectivity and useful life of the catalyst. This is an up‐to‐date review of the state of knowledge about the heterogeneous catalytic conversion of biomass into LA, addressing the technical hurdles that impede the attainment of high...

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Research paper thumbnail of Wide range humidity sensors printed on biocomposite films of cellulose nanofibril and poly(ethylene glycol)

Journal of Applied Polymer Science, 2019

ABSTRACTCellulose nanofibril (CNF) films were prepared from side streams generated by the sugarca... more ABSTRACTCellulose nanofibril (CNF) films were prepared from side streams generated by the sugarcane industry, that is, bagasse. Two fractionation processes were utilized for comparison purposes: (1) soda and (2) hot water and soda pretreatments. 2,2,6,6‐Tetramethylpiperidinyl‐1‐oxyl‐mediated oxidation was applied to facilitate the nanofibrillation of the bagasse fibers. Poly(ethylene glycol) (PEG) was chosen as plasticizer to improve the ductility of CNF films. The neat CNF and biocomposite films (CNF and 40% PEG) were used for fabrication of self‐standing humidity sensors. CNF‐based humidity sensors exhibited high change of impedance, within four orders of magnitude, in response to relative humidity (RH) from 20 to 90%. The use of plasticizer had an impact on sensor kinetics. While the biocomposite film sensors showed slightly longer response time, the recovery time of these plasticized sensors was two times shorter in comparison to sensors without PEG. This study demonstrated that...

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Research paper thumbnail of Bagasse—A major agro-industrial residue as potential resource for nanocellulose inks for 3D printing of wound dressing devices

Additive Manufacturing, 2019

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Research paper thumbnail of Efecto del control de malezas y fertilización sobre pulpas CMP de álamo

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Investigación: Obtención de biopolietileno 2G a partir de aserrín de pino

El Papel: revista internacional de la fabricación de pasta y papel, 2020

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Research paper thumbnail of Second-generation bioethanol from industrial wood waste of South American species

Biofuel research journal, Sep 1, 2017

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Research paper thumbnail of Toward the use of mixed microbial cultures for the biological production of adipic and levulinic acid

Frontiers in Microbiology

Biological synthesis of high added-value compounds like adipic acid (AA), levulinic acid (LA), or... more Biological synthesis of high added-value compounds like adipic acid (AA), levulinic acid (LA), or polyhydroxybutyrate (PHB) using pure culture has been separately reported. However, pure culture requires sterile conditions and the use of specific carbon sources resulting in high operating costs. Different alternatives based on the use of mixed microbial cultures (MMC) have been explored to resolve this problem. MMC have been widely reported for the production of PHB, but scarcely reported for LA production and never for AA synthesis. This work presents a novel strategy for the co-production of AA LA, and PHB using MMC. The strategy consists in selecting an MMC producer of AA, LA and PHB from an inoculum obtained from a wastewater treatment plant, which is then subjected to the feast and famine culture strategy in a sequential batch reactor, coupled with a batch reactor step to enhance the accumulation of AA and LA. The results showed that the MMC could produce a 16 ± 2, 23 ± 1 and 5...

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Research paper thumbnail of Process Design for Value-Added Products in a Biorefinery Platform from Agro and Forest Industrial Byproducts

Polymers

Agroforestry wastes are industrial byproducts available locally such as eucalyptus sawdust (EUC) ... more Agroforestry wastes are industrial byproducts available locally such as eucalyptus sawdust (EUC) and sugarcane bagasse (SCB). These byproducts can be used as lignocellulosic raw materials to produce high-value products. This study is a techno–economic analysis of four potential scenarios to produce polyhydroxybutyrate (PHB) and levulinic acid (LA) from hemicellulosic sugars by a fermentative pathway in a biomass waste biorefinery. Mass and energy balances were developed, and technical and economic assessments were carried out to obtain gas, char, and tar from residual solids from autohydrolysis treatment. It was determined that microbial culture could be an attractive option for added-value product production. More than 1500 t/year of PHB and 2600 t/year of LA could be obtained by the proposed pathways. Microbial and enzymatic conversion of LA from sugars could significantly improve energy consumption on the conversion strategy. The products from solid residual valorization (char an...

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Research paper thumbnail of Strategy for biological co-production of levulinic acid and polyhydroxyalkanoates by using mixed microbial cultures fed with synthetic hemicellulose hydrolysate

Bioresource Technology

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Research paper thumbnail of Technological and economic barriers of industrial-scale production of nanocellulose

Green Nanomaterials for Industrial Applications

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Research paper thumbnail of Caracterización morfológica de las traqueidas de pino híbrido de rápido crecimiento

Maderas. Ciencia y tecnología

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Research paper thumbnail of Towards biodegradable barrier packaging: Production of films for single-use primary food liquid packaging

BioResources

This research aimed to obtain bio-degradable microfibrillated cellulose (MFC) films from a pine s... more This research aimed to obtain bio-degradable microfibrillated cellulose (MFC) films from a pine sawdust pulp for use as liquid containers. The films were combined with food-grade polyols (sorbitol, glycerol, and mannitol) to improve the hydrophobicity and provide barrier properties. Pine sawdust (a by-product of primary wood industrialization, highly available, and inexpensive) was treated with soda-ethanol and a 2-stage oxygen sequence. The resulting pulps were mechanically fibrillated to produce MFC with a disk refiner. The polyols were added to improve crosslinking and achieve a plasticizing effect. The films were dried at 25, 50, and 60 °C. The mechanical and barrier properties (tensile strength, elongation, vapor permeability, and water absorption), the crystallinity, and the transparency of the films were evaluated. Total migration tests were carried out to verify the compliance of the films with current regulations. Finally, the film’s biodegradation properties in soil under ...

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Research paper thumbnail of Integrating the new age of bioeconomy and Industry 4.0 into biorefinery process design

BioResources

Manufacturing processes and their economy are dramatically evolving due to machinery and digital ... more Manufacturing processes and their economy are dramatically evolving due to machinery and digital control improvements. Artificial intelligence, big data analytics, and the Internet of Things are key tools for this new industrial revolution era based on Industry 4.0. Bioeconomy and circular economy concepts have appeared in the forest, agriculture, food, pharmaceutical, pulp and paper, chemical, biotechnological, and energy areas, etc., to achieve sustainable economic growth development via biomass valorization in a biorefinery platform. Biorefinery process development at an industrial scale requires the previous design and assessment of processes and technologies. Therefore, economic, environmental, and social factors should be evaluated to prevent the failure in one of these issues that could affect the performance of the others. With a growing interest in sustainable economic development, there is a need to incorporate new technologies early enough in the process design. This stud...

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Research paper thumbnail of Obtaining xylitol by hydrolysis-hydrogenation of liquors derived from sugarcane bagasse

Chemical Industry and Chemical Engineering Quarterly

This work presents the study of heterogeneous catalysis of sugarcane bagasse hydrothermal treatme... more This work presents the study of heterogeneous catalysis of sugarcane bagasse hydrothermal treatment spent liquors using a sulfonated resin. Besides, results were compared with those obtained by a conventional route using sulfuric acid as a homogeneous catalyst. Heterogeneous catalysis is suitable for the hydrolysis of sugarcane bagasse hydrothermal liquors under mild conditions (100?C and 6 h). The obtained maximum xylose yield was 82% due to furfural formation, which causes a xylose selectivity drop. The hydrogenation of this xylose-rich liquor at 100 ?C and 3 MPa of hydrogen pressure employing a supported Ni/?-Al2O3 produced the total conversion of xylose with a selectivity towards xylitol of 100% by using a catalyst to xylose mass ratio of 0.5. Heterogeneous catalysis in a two-step route (hydrolysis and hydrogenation) constitutes an outstanding alternative to producing xylitol from sugarcane bagasse hydrothermal spent liquors since materials can be easily separated and reused in ...

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Research paper thumbnail of Tratamiento con ozono de efluentes para eliminar la materia orgánica refractaria

PULL Norte, Sep 1, 2016

En el marco del proyecto «Biorrefinería a partir de residuos de industrialización primaria de la ... more En el marco del proyecto «Biorrefinería a partir de residuos de industrialización primaria de la madera»impulsado por el Instituto de Materiales de Misiones (IMaM) en Argentina, se probaron diferentes procesosde oxidación avanzada (POA) para reducir las concentraciones de compuestos presentes en efluentesresultantes del procesamiento químico de biomasa (en este caso, compuestos recalcitrantes producidos porla fabricación de pulpa quimimecánica)En el marco del proyecto «Biorrefinería a partir de residuos de industrialización primaria de la madera» impulsado por el Instituto de Materiales de Misiones (IMaM) en Argentina, se probaron diferentes procesos de oxidación avanzada (POA) para reducir las concentraciones de compuestos presentes en efluentes resultantes del procesamiento químico de biomasa (en este caso, compuestos recalcitrantes producidos por la fabricación de pulpa quimimecánica).Fil: Cardozo, Alejandro Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Materiales de Misiones. Universidad Nacional de Misiones. Facultad de Ciencias Exactas Químicas y Naturales. Instituto de Materiales de Misiones; ArgentinaFil: Covinich, Laura Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Materiales de Misiones. Universidad Nacional de Misiones. Facultad de Ciencias Exactas Químicas y Naturales. Instituto de Materiales de Misiones; ArgentinaFil: Area, Maria Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Materiales de Misiones. Universidad Nacional de Misiones. Facultad de Ciencias Exactas Químicas y Naturales. Instituto de Materiales de Misiones; ArgentinaFil: Felissia, Fernando Esteban. Universidad Nacional de Misiones; Argentin

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Research paper thumbnail of Investigación: Fraccionamiento de aserrín de pino destinado a una biorrefinería forestal

El Papel: revista internacional de la fabricación de pasta y papel, 2017

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Research paper thumbnail of Evaluación de Cepas Fermentativas en la Hidrólisis y Fermentación Simultáneas (SSF) de Cascarilla de Arroz para la Producción de Bioetanol

The decrease in oil reserves worldwide and environmental problems caused by its use, lead to find... more The decrease in oil reserves worldwide and environmental problems caused by its use, lead to finding new renewable and less polluting alternatives.This work presents the study of the behavior of both celobiosas and cellulase enzymes, together with strains of Saccharomyces cerevisiae, Candida kefyr, Candida tropicalis and Candida guilliermondii, specifically in the process of simultaneous hydrolysis and fermentation (SSF) conducted at 35 °C to produce bioethanol from the carbohydrates of rice husks. This process seeks hydrolyze the cellulose and immediately utilize of fermentable sugars, overcoming the difficulty of the difference between the optimum temperature for the performance of enzyme (50°C) and yeast (25°C to 35°C). Rice husk was pretreated with an acid-alkaline sequence to achieve the separation of carbohydrates.The best yields to bioethanol were obtained with Saccharomyces cerevisiae (68%) and Candida kefyr (75%).

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Research paper thumbnail of Calidad de papel artesanal a partir de fibras no convencionales de cinco especies colombianas

espanolLa produccion de papel a partir de fibras de plantas anuales o de residuos agroindustriale... more espanolLa produccion de papel a partir de fibras de plantas anuales o de residuos agroindustriales es una alternativa rentable para paises con escasos recursos madereros. Estas fibras pueden ser empleadas para obtener diferentes calidades de papel artesanal. El objetivo de este estudio fue evaluar la potencialidad de cinco tipos de fibras no convencionales de Colombia (limoncillo, canelo, bambu, papayo y fique) para la fabricacion de papel artesanal mediante la caracterizacion microscopica de estas fibras y la determinacion de las propiedades fisico-mecanicas y opticas del papel artesanal obtenido. Las propiedades papeleras resultaron en general, mas bajas que las propiedades de pulpas quimicas convencionales (similares a las de una pulpa quimimecanica de eucaliptos). La mejor forma de utilizar estas fibras en papeles artesanales es elaborar hojas de gramajes superiores a 100 g/m2 y utilizarlas sin blanquear, aprovechando su aspecto rustico y coloracion natural para la fabricacion d...

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Research paper thumbnail of Influence of the Chemical Composition on the Enzymatic Hydrolysis of Hot Water and Organosolv Pretreated Sugarcane Bagasse

Waste and Biomass Valorization, 2019

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Influence of initial chemical composition and characteristics of pulps on the production and properties of lignocellulosic nanofibers

International Journal of Biological Macromolecules, 2019

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Research paper thumbnail of The challenge of converting biomass polysaccharides into levulinic acid through heterogeneous catalytic processes

Biofuels, Bioproducts and Biorefining, 2019

The differences between a biorefinery and an oil refinery are determined by the higher oxygen con... more The differences between a biorefinery and an oil refinery are determined by the higher oxygen content of the biorefinery's biomass, its high degree of functionalization, its low thermal stability, its polar components, which are mostly acidic, its highly heterogeneous structure, and its quality variation as result of genotypic and phenotypic characteristics. Levulinic acid (LA) is one of the main high value‐added chemicals that can be produced from lignocellulosic biomass as raw material. The main challenges for the conversion of lignocellulosic biomass to levulinic acid are related to the improvement of the technologies to obtain a pure and cost‐competitive product, the design and use of efficient heterogeneous catalysts, and the improvements in the selectivity and useful life of the catalyst. This is an up‐to‐date review of the state of knowledge about the heterogeneous catalytic conversion of biomass into LA, addressing the technical hurdles that impede the attainment of high...

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Research paper thumbnail of Wide range humidity sensors printed on biocomposite films of cellulose nanofibril and poly(ethylene glycol)

Journal of Applied Polymer Science, 2019

ABSTRACTCellulose nanofibril (CNF) films were prepared from side streams generated by the sugarca... more ABSTRACTCellulose nanofibril (CNF) films were prepared from side streams generated by the sugarcane industry, that is, bagasse. Two fractionation processes were utilized for comparison purposes: (1) soda and (2) hot water and soda pretreatments. 2,2,6,6‐Tetramethylpiperidinyl‐1‐oxyl‐mediated oxidation was applied to facilitate the nanofibrillation of the bagasse fibers. Poly(ethylene glycol) (PEG) was chosen as plasticizer to improve the ductility of CNF films. The neat CNF and biocomposite films (CNF and 40% PEG) were used for fabrication of self‐standing humidity sensors. CNF‐based humidity sensors exhibited high change of impedance, within four orders of magnitude, in response to relative humidity (RH) from 20 to 90%. The use of plasticizer had an impact on sensor kinetics. While the biocomposite film sensors showed slightly longer response time, the recovery time of these plasticized sensors was two times shorter in comparison to sensors without PEG. This study demonstrated that...

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Research paper thumbnail of Bagasse—A major agro-industrial residue as potential resource for nanocellulose inks for 3D printing of wound dressing devices

Additive Manufacturing, 2019

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