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Coffea arábica silver skin (CSS), a by-product of coffee processing, is a lignocellulosic biomass with potential for sustainable applications. This study aimed to evaluate the effect of treatment with distilled water at 95 ºC on CSS’s physical and chemical characteristics. Structural components, ash, ionic demand and mineral compositions by X-ray fluorescence were analysed. The results indicated a 33.46% removal of total extractives, which promoted a structural reorganization of the biomass, including total phenolic compounds decreased by 29.36%. Besides that, reflected in the proportional increase in cellulose (+ 221.60%) and lignin (+ 119.56%). The cation demand decreased significantly from 184.67 to 64.33 meq/kg, suggesting lower ionic reactivity. Mineralogical analysis by X-ray fluorescence revealed a reduction in Fe (99.71%), Al (99.54%), and Ca (39.19%), as well as an increase in P (148.86%) and Cl (157.35%). These data show that the physical-chemical treatment significantly modifies the composition of the biomass, contributing to the valorisation of this underused agroindustrial waste, which has the potential to be used in various technological and sustainable applications.

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From Waste to Worth: How Water Modified the Composition of Undervalued Coffee Silver Skin

  • 会议论文

  • 发表日期：

    2026年

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  • Danilo José Machado de Abreu,
  • Zlatina Asenova Genisheva,
  • Rafael Farinassi Mendes,
  • Whasley Ferreira Duarte

摘要

Coffea arábica silver skin (CSS), a by-product of coffee processing, is a lignocellulosic biomass with potential for sustainable applications. This study aimed to evaluate the effect of treatment with distilled water at 95 ºC on CSS’s physical and chemical characteristics. Structural components, ash, ionic demand and mineral compositions by X-ray fluorescence were analysed. The results indicated a 33.46% removal of total extractives, which promoted a structural reorganization of the biomass, including total phenolic compounds decreased by 29.36%. Besides that, reflected in the proportional increase in cellulose (+ 221.60%) and lignin (+ 119.56%). The cation demand decreased significantly from 184.67 to 64.33 meq/kg, suggesting lower ionic reactivity. Mineralogical analysis by X-ray fluorescence revealed a reduction in Fe (99.71%), Al (99.54%), and Ca (39.19%), as well as an increase in P (148.86%) and Cl (157.35%). These data show that the physical-chemical treatment significantly modifies the composition of the biomass, contributing to the valorisation of this underused agroindustrial waste, which has the potential to be used in various technological and sustainable applications.