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Application of In-House Xylanases as an Addition to a Commercial Cellulase Cocktail for the Sustainable Saccharification of Pretreated Blue Agave Bagasse Used for Bioethanol Production

Author

Listed:
  • Carmina Montiel

    (Departamento de Alimentos y Biotecnología, Facultad de Química, Universidad Nacional Autónoma de México (UNAM), Mexico City 04510, Mexico)

  • Oscar Hernández-Meléndez

    (Departamento de Ingeniería Química, Facultad de Química, Universidad Nacional Autónoma de México (UNAM), Mexico City 04510, Mexico)

  • Susana Marques

    (Unidade de Bioenergia e Biorrefinarias, Laboratório Nacional de Energia e Geologia, I.P., 1649-038 Lisboa, Portugal)

  • Francisco Gírio

    (Unidade de Bioenergia e Biorrefinarias, Laboratório Nacional de Energia e Geologia, I.P., 1649-038 Lisboa, Portugal)

  • João Tavares

    (Unidade de Bioenergia e Biorrefinarias, Laboratório Nacional de Energia e Geologia, I.P., 1649-038 Lisboa, Portugal)

  • Ornella Ontañon

    (Instituto de Agrobiotecnología y Biología Molecular (IABIMO), INTA-CONICET, Los Reseros y Nicolas Repetto s/n, Hurlingham, Buenos Aires 1686, Argentina)

  • Eleonora Campos

    (Instituto de Agrobiotecnología y Biología Molecular (IABIMO), INTA-CONICET, Los Reseros y Nicolas Repetto s/n, Hurlingham, Buenos Aires 1686, Argentina)

  • Eduardo Bárzana

    (Departamento de Alimentos y Biotecnología, Facultad de Química, Universidad Nacional Autónoma de México (UNAM), Mexico City 04510, Mexico)

Abstract

The study involves the use of commercial cellulase Cellic CTec2 in combination with two in-house xylanases, Px Xyn10A (XynA), a recombinant purified enzyme from Paenibacillus xylanivorans A59, and a xylanase enzymatic extract from native Moesziomyces aphidis PYCC 5535T (MaPYCC 5535T), for the enzymatic hydrolysis of pretreated blue agave bagasse (BAB) at the high solids load of 20% ( w / v ). Three different combinations of cellulase and xylanases were evaluated. When Cellic ® CTec2 was used at a dosage of 10 FPU/g oven-dried solids (ODS) supplemented with XynA or MaPYCC 5535T at an endo-xylanase dosage of 100 U/g ODS, increases in the xylose yield of 30% and 33%, respectively, were obtained. When applying in-house xylanases alone (at an endo-xylanase dosage of 100 U/g ODS), xylan in BAB was selectively hydrolyzed into xylose with 5% yield with MaPYCC 5535T, while no xylose was detected with XynA. Interestingly, a synergic effect of Cellic ® CTec 2 with both xylanases was observed when using a low dosage of 1 FPU/g ODS (allowing for some liquefaction of the reaction mixture), promoting xylose and glucose release by either xylanase. A higher concentration of monomeric sugars was obtained with 10 FPU/g ODS of Cellic ® Ctec 2 supplemented with 100 U/g ODS of MaPYCC 5535T, followed by XynA. The improvement in saccharification through the synergistic combination of in-house xylanases and commercial cellulases allows for the obtention of sugar-rich hydrolysates, which enhances the technical sustainability of the process. Hydrolysates were then fermented using recombinant Cellux 4 TM yeast to yield 45 g/L ethanol, representing an increase of about 30% with respect to the control obtained with only the commercial cellulase cocktail. The surface modification of agave biomass with the different combinations of enzymes was evidenced by scanning electron microscopy (SEM).

Suggested Citation

  • Carmina Montiel & Oscar Hernández-Meléndez & Susana Marques & Francisco Gírio & João Tavares & Ornella Ontañon & Eleonora Campos & Eduardo Bárzana, 2024. "Application of In-House Xylanases as an Addition to a Commercial Cellulase Cocktail for the Sustainable Saccharification of Pretreated Blue Agave Bagasse Used for Bioethanol Production," Sustainability, MDPI, vol. 16(16), pages 1-13, August.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:16:p:6722-:d:1450924
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    References listed on IDEAS

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    1. Caspeta, Luis & Caro-Bermúdez, Mario A. & Ponce-Noyola, Teresa & Martinez, Alfredo, 2014. "Enzymatic hydrolysis at high-solids loadings for the conversion of agave bagasse to fuel ethanol," Applied Energy, Elsevier, vol. 113(C), pages 277-286.
    2. Duque, Aleta & Doménech, Pablo & Álvarez, Cristina & Ballesteros, Mercedes & Manzanares, Paloma, 2020. "Study of the bioprocess conditions to produce bioethanol from barley straw pretreated by combined soda and enzyme-catalyzed extrusion," Renewable Energy, Elsevier, vol. 158(C), pages 263-270.
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