High xylose yield from stem and external fraction of sugarcane biomass by diluted acid pretreatment
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ORIGINAL ARTICLE
High xylose yield from stem and external fraction of sugarcane biomass by diluted acid pretreatment C. Santos 1 & Danilo Bueno 2
&
C. Sant’Anna 1 & Michel Brienzo 2
Received: 3 July 2020 / Revised: 18 September 2020 / Accepted: 16 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Lignocellulosic materials are complex, recalcitrant, and difficult to release fermentable carbohydrates, such as xylose. Xylose is the feedstock for the development of products with high added value, such as ethanol, butanol, xylitol, and furfural. A high xylose yield was obtained from epidermis-free stem and external fraction (containing epidermis) of sugarcane with minimal formation of degradation products using dilute acid pretreatment. The influences of variables such as sulfuric acid concentration (% m/m or % m/v), reaction time (min), and solid/liquid ratio (% m/v) on acid pretreatment were investigated through a central composite design. In study region 1, stem and external fraction had xylose yields of 58.69 and 55.33%, as well as 1.79 and 2.16% of furfural. The optimal condition to obtain high xylose yield was observed with the use of 50% m/m or 1% m/v of sulfuric acid. The highest xylose extraction was achieved in the epidermis-free stem, leading to a less recalcitrant fraction. Xylose has a key role in obtaining products with high added value. For this reason, this study obtained high xylose yield applying optimal conditions of dilute acid pretreatment, with minimum degradation products. Keywords Biomass conversion . Sugarcane . Acid pretreatment . Renewable feedstock . Xylose yield
1 Introduction The search for renewable products and energy has shown great importance worldwide to minimize the dependence on fossil fuels and to satisfy the need for diversification of the energy matrix. In addition, the emission of large amounts of greenhouse gases has caused disastrous climate change [1]. In this scenario, biofuel production from sugarcane biomass is
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13399-020-01088-z) contains supplementary material, which is available to authorized users. * Danilo Bueno [email protected] Michel Brienzo [email protected] 1
Laboratory of Microscopy Applied to Life Science – Lamav, National Institute of Metrology, Quality and Technology – Inmetro, Duque de Caxias, RJ 25250-020, Brazil
2
Institute for Research in Bioenergy, IPBEN, University of São Paulo State (UNESP), Rio Claro, SP 13500-230, Brazil
becoming increasingly attractive, mainly because it is widely available, inexpensive [2], cost efficient, and ecofriendly [3]. In addition to the production of biofuels, a wide variety of products with high added value are obtained through the conversion of sugarcane biomass. Some examples of such production are xylooligosaccharides and gluconic acid [4, 5], xylonic acid [6], packaging, hydrogels, production of lactic acid through the fermentation of monomeric sugars from xylan by microor
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