Enhancing the recovery yield and quality of oil from coconut residue by ultrasound pretreatment-assisted ethanol extraction
Coconut residue, a by-product of the coconut milk industry, contains a high percentage of oil. This study extracted oil from coconut residue using an ultrasound pretreatment process with absolute ethanol as a green solvent. Ultrasound power (120, 180, and 240 W), pretreatment time (0, 15, 30, and 45...
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| Main Authors: | , , , |
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| Format: | Article |
| Sprog: | engelsk |
| Udgivet: |
Elsevier
2025-08-01
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| Serier: | Journal of Agriculture and Food Research |
| Fag: | |
| Online adgang: | http://www.sciencedirect.com/science/article/pii/S2666154325005046 |
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| Summary: | Coconut residue, a by-product of the coconut milk industry, contains a high percentage of oil. This study extracted oil from coconut residue using an ultrasound pretreatment process with absolute ethanol as a green solvent. Ultrasound power (120, 180, and 240 W), pretreatment time (0, 15, 30, and 45 min), material particle size (original, >0.60 mm, 0.60–0.36 mm, 0.36–0.25 mm, and <0.25 mm), and solvent-to-material ratio (10, 15, and 20 mL/g) were determined for maximum extraction efficiency and high oil quality. Results suggested that optimal ultrasound power and pretreatment time were 180 W and 45 min. The original unsieved sample size at an ethanol-to-material ratio of 15 mL/g was optimal for oil extraction, with the highest yield 23.3 wt%, the lowest free fatty acid (FFA) 0.9 % and peroxide value (PV) 0.25 meq/kg oil. Oil extracted from the coconut residue by ultrasound pretreatment had higher antioxidant activity and lower oxidation state than oil extracted from untreated material, as indicated by the PV and TBARS measurements, total phenolic content, DPPH scavenging activity and FTIR analysis. Findings suggested that ultrasound pretreatment effectively increased oil recovery from coconut residue using ethanol as the solvent, with no changes in physicochemical properties and fatty acid composition. |
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| ISSN: | 2666-1543 |