Extraction optimization of eel (Anguilla bicolor) oil using reflux and ultrasound-assisted extraction methods

Optimasi ekstraksi minyak ikan sidat (Anguilla bicolor) menggunakan metode refluks dan ekstraksi berbantuan gelombang ultrasonik

Authors

DOI:

https://doi.org/10.17844/99k84e70

Keywords:

health benefit, oil extraction, omega-3 fatty acids, polyunsaturated fatty acids, response surface methodology

Abstract

Eel (Anguilla bicolor) is a freshwater fish that contains polyunsaturated fatty acids including omega-3 fatty acids and making it a potential source for food enrichment. This study aimed to determine the optimum conditions for eel oil extraction using reflux and ultrasonic-assisted extraction methods and to compare the efficiency of both techniques. A central composite design within response surface methodology (RSM) was employed to optimize the extraction parameters. Reaction time (30, 60, and 90 minutes) and solvent-to-solid ratio (5:1, 10:1, and 15:1) were selected as independent variables, while oil yield was used as the response variable. RSM analysis revealed that both reaction time and solvent ratio significantly influenced oil yield (p<0.05). The UAE method produced a higher optimum yield (47.53%) than the reflux method (45.87%). The optimum extraction conditions for UAE were achieved at a solvent-to-solid ratio of 11.21:1 and 69.50 minutes, while the reflux extraction was optimized at 12.21:1 and 70.55 minutes. Replication of extractions confirmed consistent yields of 47.7% for UAE and 45.6% for reflux. Fatty acid analysis indicated that oil from reflux extraction contained 31.15% saturated and 68.38% unsaturated fatty acids, while UAE yielded 32.75% saturated and 66.76% unsaturated fatty acids. Although UAE was more efficient in terms of yield, time, and solvent use, the reflux method resulted eel oil with higher concentrations of polyunsaturated fatty acids, including α-linolenic acid, eicosatrienoic acid, and eicosapentaenoic acid. This study proves that optimizing the extraction of both methods using RSM has produced eel oil with high yield and PUFAs content.

Author Biographies

  • Diza Fathamira Hamzah, Universitas Syiah Kuala, Universitas Sumatera Utara

    Diza Fathamira Hamzah, Ph.D. Candidate, Graduate School of Mathematics and Applied Sciences, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia 

    and a Lecturer of Department of Public Health, Faculty of Public Health Universitas Sumatera Utara Jalan Universitas No. 21 Kampus USU Medan Indonesia 20155

  • Sri Haryani Anwar, Universitas Syiah Kuala

    Sri Haryani Anwar., Dr.-Ing., Professor, Department of Agricultural Product Technology, Faculty of Agriculture, Universitas Syiah Kuala Banda Aceh 23111, Indonesia

  • Satriana, Universitas Syiah Kuala

    Dr. Satriana, Department of Agricultural Product Technology, Faculty of Agriculture, Universitas Syiah Kuala Banda Aceh 23111, Indonesia

  • Amalia Sutriana, Universitas Syiah Kuala

    Dr. Amalia Sutriana., Department of Veterinary Medicine, Faculty of Veterinary Medicine, Universitas Syiah Kuala Banda Aceh 23111, Indonesia

  • Rinaldi Idroes, Universitas Syiah Kuala

    Rinaldi Idroes., Ph.D., Professor, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia

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2026-04-07 — Updated on 2026-04-08

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Hamzah, D. F., Anwar, S. H., Satriana, S., Sutriana, A., & Idroes, R. (2026). Extraction optimization of eel (Anguilla bicolor) oil using reflux and ultrasound-assisted extraction methods: Optimasi ekstraksi minyak ikan sidat (Anguilla bicolor) menggunakan metode refluks dan ekstraksi berbantuan gelombang ultrasonik. Jurnal Pengolahan Hasil Perikanan Indonesia, 29(3), 238–256. https://doi.org/10.17844/99k84e70 (Original work published 2026)