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<p>The coffee industry generates large volumes of lignocellulosic waste, whose inadequate management poses environmental and public health concerns. In this study, the recovery of bioactive compounds from coffee husks was evaluated using subcritical water extraction (160, 180, and 200&#xa0;°C), analyzing the effect of thermal severity (Log Ro) and biological pretreatment with <i>Pleurotus ostreatus</i> on the chemical composition and antioxidant properties of the extracts. Sugars (xylose, glucose), degradation products (furfural, acetic acid), total phenolic content, and antioxidant activity (ABTS, DPPH, and FRAP) were quantified. The results showed that moderate severity (Log Ro = 7.25) favored xylose release (30.97 ± 0.48&#xa0;mg/g DB) while limiting the formation of degradation products that may affect extract quality. Increasing severity enhanced phenolic recovery and reducing capacity, reaching maximum values at Log Ro 8.39, with up to 20.19&#xa0;mg GAE/g DB and 95.66&#xa0;mg TE/g DB, respectively. However, antioxidant efficiency, evaluated through IC₅₀, showed a method-dependent behavior. While DPPH activity decreased at high severity in untreated samples, ABTS results improved in biologically treated samples, with IC₅₀ values decreasing by approximately 70%. Biological pretreatment did not significantly increase total antioxidant capacity but may have contributed to changes in biomass accessibility and extract behavior, as suggested by the significant interaction between severity and treatment. These findings highlight the importance of the severity factor (Log Ro) as an integrative parameter for hydrothermal extraction processes and support the potential of combining thermal and biological treatments for the sustainable valorization of coffee by-products within a biorefinery framework.</p> Graphical abstract <p></p>

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Effect of biological pretreatment with Pleurotus ostreatus and severity of subcritical water extraction on recovery of bioactive compounds from coffee husk

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月10日

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  • Juliana Uriza-Basto,
  • Luis Gonzalo Sequeda-Castañeda,
  • Yineth Piñeros-Castro

摘要

The coffee industry generates large volumes of lignocellulosic waste, whose inadequate management poses environmental and public health concerns. In this study, the recovery of bioactive compounds from coffee husks was evaluated using subcritical water extraction (160, 180, and 200 °C), analyzing the effect of thermal severity (Log Ro) and biological pretreatment with Pleurotus ostreatus on the chemical composition and antioxidant properties of the extracts. Sugars (xylose, glucose), degradation products (furfural, acetic acid), total phenolic content, and antioxidant activity (ABTS, DPPH, and FRAP) were quantified. The results showed that moderate severity (Log Ro = 7.25) favored xylose release (30.97 ± 0.48 mg/g DB) while limiting the formation of degradation products that may affect extract quality. Increasing severity enhanced phenolic recovery and reducing capacity, reaching maximum values at Log Ro 8.39, with up to 20.19 mg GAE/g DB and 95.66 mg TE/g DB, respectively. However, antioxidant efficiency, evaluated through IC₅₀, showed a method-dependent behavior. While DPPH activity decreased at high severity in untreated samples, ABTS results improved in biologically treated samples, with IC₅₀ values decreasing by approximately 70%. Biological pretreatment did not significantly increase total antioxidant capacity but may have contributed to changes in biomass accessibility and extract behavior, as suggested by the significant interaction between severity and treatment. These findings highlight the importance of the severity factor (Log Ro) as an integrative parameter for hydrothermal extraction processes and support the potential of combining thermal and biological treatments for the sustainable valorization of coffee by-products within a biorefinery framework.

Graphical abstract