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All Journal International Journal of Renewable Energy Development
Shela Delfia Ramadhana
Faculty of Biology, Universitas Gadjah Mada, Jl. Teknika Selatan, Sleman 55281, Yogyakarta
Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering

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Light intensity enhances fatty acid and biomass composition of an acidophilic Euglena gracilis isolated from Dieng peatland, Central Java for biofuel production David Aritonang; Tia Erfianti; Renata Adaranyssa Egistha Putri; Kartina Kartina; Shela Delfia Ramadhana; Brilian Ryan Sadewo; Angga Puja Asiandu; Eko Agus Suyono
International Journal of Renewable Energy Development Vol 15, No 6 (2026): November 2026
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.61637

Abstract

Optimizing environmental factors in microalgal cultivation is essential for improving biomass and lipid production for biofuel applications. This study examined the effects of light intensity under 15% CO2 supplementation on growth, biomass, lipid and paramylon productivity, pigment content, and fatty acid methyl ester (FAME) composition in a local acidophilic E. gracilis strain cultivated at 500, 2,100, 4,500, 6,000, and 8,500 lux. The highest proportions of saturated, monounsaturated, and polyunsaturated fatty acids were observed at 8,500 lux (42.35%), 500 lux (59.01%), and 4,500 lux (23.705%), respectively. Methyl palmitoleate (C16:1) showed its highest relative abundance at 500 lux (32.46%), whereas its relative abundance at 6,000 lux was 26.34%. Biomass and lipid productivities were highest at 6,000 lux (0.0874 ± 0.0035 and 0.0311 ± 0.0030 mg/mL/day, respectively), while paramylon productivity was highest at 8,500 lux (0.030 ± 0.0011 mg/mL/day). The logistic growth model gave the highest maximum specific growth rate at 8,500 lux (0.78 day⁻¹). Chlorophyll a, chlorophyll b, and carotenoid contents peaked at 6,000 lux. The predicted biodiesel properties at 6,000 lux were an iodine value of 89.67 g I₂/100 g, a saponification value of 190.99 mg KOH/g, and a cetane number of 49.16. Overall, 6,000 lux provided the best balance for biomass and lipid production, whereas 8,500 lux favored paramylon accumulation. The FAME profile, particularly the high relative abundance of C16:1, supports further evaluation of this strain as a biodiesel feedstock.
Co-Authors Angga Puja Asiandu Brilian Ryan Sadewo David Aritonang Eko Agus Suyono Kartina Kartina Renata Adaranyssa Egistha Putri Tia Erfianti