Scholarship 22/11905-3 - Borra de café, Galactose - BV FAPESP
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Optimization of spent ground coffee pretreatment to obtain a hydrolysate rich in fermentable sugars

Grant number: 22/11905-3
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Start date until: November 01, 2022
End date until: January 31, 2025
Field of knowledge:Engineering - Chemical Engineering
Principal Investigator:Kelly Johana Dussán Medina
Grantee:Matheus Costa Monteiro dos Santos
Host Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
Associated scholarship(s):24/05646-0 - Comparative Life Cycle Assessment for Different Spent Coffee Grounds Utilization Strategies., BE.EP.IC

Abstract

Implementing biorefineries to replace products and processes obtained from non-renewable raw materials, especially petroleum, with products and processes that use lignocellulosic biomass still requires the development of technologies that allow the full use of these biomasses with economic and energetic potential. From these considerations, this project has as its main objective the inclusion of spent ground coffee, one of the most common residues obtained in coffee shops and which is currently discarded as lignocellulosic raw material. However, there are still barriers related to the availability of monomeric sugars to obtain bioproducts with high added value. Furthermore, the pretreatment step is critical for converting lignocellulosic materials into different bioproducts due to the close association between cellulose, hemicellulose, and lignin. Therefore, the central role of pretreatment is to decrease the interaction between the main components of the cell wall and produce a low amount of by-products. In this way, the present project aims to evaluate and optimize operational variables that influence the pre-treatment stage of spent coffee grounds, using dilute sulfuric acid as a catalyst, to obtain the maximum extraction of monosaccharides contained in the hemicellulosic fraction and its subsequent fermentation using the yeast Rhodosporidium toruloides UFMG-CM-Y2896. With the development of this project, we will create an option for the use of this lignocellulosic material and generating data that increase the value of spent ground coffee residue, highlighting its potential, contributing to overcome the challenges that still exist, aiming at its incorporation in biorefineries and achieving adequate technologies and efficient from an environmental point of view.

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