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<p>Fruit processing waste remains a promising, yet untapped, resource for the extraction of oils used as feedstock for energy production. This study investigates the extraction of oil from papaya and mango seed varieties using various solvents with an emphasis on oil yield (OY), fatty acid composition, and the heating value of the residual organic waste. Papaya seeds (PS) demonstrated a higher oil yield of 27.21%, while hybrid mango (HMS) and local mango (LMS) yielded 18.72% and 18.23%, respectively. The observed differences in OY are attributed to solvent polarity and the inherent physicochemical composition of the seeds. Among the tested, acetone facilitated the extraction of 30.09% oil from HMS, while methanol and ethanol yielded 35.65% and 23.36% from PS and LMS, respectively. Fatty acid analysis revealed that oleic acid was the predominant constituent in all oil samples, accounting for 89.59% in PS, 83.29% in HMS, and 66.82% in LMS, respectively. Furthermore, the oils were rich in monounsaturated fatty acids, accounting for 90.72%(PS), 84.50%(HMS), and 73.57%(LMS) of total fatty acid content. The acid values of the oils were determined to be 3.68, 12.76, and 14.44&#xa0;mg KOH/g for PS, HMS, and LMS, respectively, indicating the potential necessity for acid-catalyzed, two-step transesterification or other pretreatment for efficient biodiesel production. The mean calorific value of the biomass residues post-extraction was 18.27&#xa0;kJ/g, which is comparable to different dry wo. like Scots pine (17.74–19.04&#xa0;MJ/kg), silver fir (19.49–20.79&#xa0;MJ/kg), and wheat straw briquettes (17.52–17.67&#xa0;MJ/kg), undercoring their suitability in energy production applications, such as bio-briquettes.</p> Graphical abstract <p></p>

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Analyzing the impact of solvent and seed pretreatment on oil yield and calorific value of deoiled papaya and mango seed residues

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  • 发表日期：

    2026年4月21日

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  • Getachew D. Gebre,
  • Shemelis N. Gebremariam,
  • Yadessa G. Keneni,
  • Jorge M. Marchetti

摘要

Fruit processing waste remains a promising, yet untapped, resource for the extraction of oils used as feedstock for energy production. This study investigates the extraction of oil from papaya and mango seed varieties using various solvents with an emphasis on oil yield (OY), fatty acid composition, and the heating value of the residual organic waste. Papaya seeds (PS) demonstrated a higher oil yield of 27.21%, while hybrid mango (HMS) and local mango (LMS) yielded 18.72% and 18.23%, respectively. The observed differences in OY are attributed to solvent polarity and the inherent physicochemical composition of the seeds. Among the tested, acetone facilitated the extraction of 30.09% oil from HMS, while methanol and ethanol yielded 35.65% and 23.36% from PS and LMS, respectively. Fatty acid analysis revealed that oleic acid was the predominant constituent in all oil samples, accounting for 89.59% in PS, 83.29% in HMS, and 66.82% in LMS, respectively. Furthermore, the oils were rich in monounsaturated fatty acids, accounting for 90.72%(PS), 84.50%(HMS), and 73.57%(LMS) of total fatty acid content. The acid values of the oils were determined to be 3.68, 12.76, and 14.44 mg KOH/g for PS, HMS, and LMS, respectively, indicating the potential necessity for acid-catalyzed, two-step transesterification or other pretreatment for efficient biodiesel production. The mean calorific value of the biomass residues post-extraction was 18.27 kJ/g, which is comparable to different dry wo. like Scots pine (17.74–19.04 MJ/kg), silver fir (19.49–20.79 MJ/kg), and wheat straw briquettes (17.52–17.67 MJ/kg), undercoring their suitability in energy production applications, such as bio-briquettes.

Graphical abstract