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All Journal HAYATI Journal of Biosciences Journal of Tropical Life Science : International Journal of Theoretical, Experimental, and Applied Life Sciences Berkala Bioteknologi Makara Journal of Science Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan Depik Jurnal Ilmu-Ilmu Perairan, Pesisir, dan Perikanan
Erfianti, Tia
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Education Engineering Environmental Science

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Journal : Makara Journal of Science

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The Effect of Acidic pH on Growth Kinetics, Biomass Productivity, and Prima-ry Metabolite Contents of Euglena sp. Nurafifah, Istini; Hardianto, Muhammad Andhi; Erfianti, Tia; Amelia, Ria; Maghfiroh, Khusnul Qonita; Kurnianto, Dedy; Siswanti, Dwi Umi; Sadewo, Brilian Ryan; Putri, Renata Adaranyssa Egistha; Suyono, Eko Agus
Makara Journal of Science Vol. 27, No. 2
Publisher : UI Scholars Hub

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Euglena is a microalga with the potential to be an environmentally friendly renewable energy resource. The pH value is a crucial factor in micro-algal cultivation. Changes in pH affect the growth and development of microalgae, including the production of biomass and primary metabolites, such as proteins, carbohydrates, and lipids. In this study, Euglena sp. was grown on Cramer-Myers medium and subjected to various acidic conditions. This study aimed to determine the effect of pH on the growth kinetics, biomass, carbohydrate, lipid, and protein contents of Euglena sp. The Euglena sp. culture was optimized at various pH values of 2.5, 3.5, and 4.5. The results were analyzed by one-way analysis of variance at a 95% confidence level, followed by Duncan’s multiple range test. As results, Euglena sp. had the best growth rate, the greatest biomass, and the highest carbohydrate, protein, and lipid contents at pH 3.5 compared to the other pH conditions. The average biomass in the pH 3.5 treatment was 1.600 ± 0.229 g/L, and the carbohydrate, protein, and lipid contents were 5.983 ± 0.056 g/L, 0.196 ± 0.023 µg/mL, and 0.300 ± 0.020 g/L, respectively.
Effect of Red and Blue Light on Lipid, Protein, Carbohydrate, and Pigment Contents of Navicula sp. Maulana, Sofyan; Nurul Hida, Aulia Setyo; Wulandari, Ismia; Mudrikah, Siti; Kurnianto, Dedy; Maghfiroh, Khusnul Qonita; Amelia, Ria; Erfianti, Tia; Putri, Renata Adaranyssa Egistha; Devi Anggraini, Irika; Marno, Septhian; Suyono, Eko Agus Agus
Makara Journal of Science
Publisher : UI Scholars Hub

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Light quality critically modulates the physiology of diatoms, influencing photosynthetic efficiency and metabolite synthesis. This study examines how monochromatic red (620–750 nm) or blue (450–495 nm) light affects the biochemical profiles and pigment production in Navicula sp. versus white light (control). Cultures were grown in sterile f/2 medium, and biomass was tracked via OD680. Biochemical analyses included lipids (Bligh and Dyer method), carbohydrates (phenol-sulfuric acid assay), proteins (Bradford assay), and pigments (spectrophotometric quantification). The growth dynamics were modeled using logistic and Gompertz equations. No significant differences in OD-based growth rates, carbohydrates, proteins, or lipids content were observed with red or blue light compared with the control. However, blue light elevated chlorophyll a levels 4-fold and maximized protein productivity 3-fold, whereas red light enhanced carotenoid content by 20.5-fold. The growth kinetics modeling that best matched the experimental data was the Gompertz modeling (R² > 0.649). These results demonstrate the wavelength-specific regulation of pigment and protein yields, suggesting that tailored light regimes can selectively optimize high-value metabolites in Navicula sp. This approach holds promise for biotechnology sectors prioritizing targeted compound production, such as nutraceuticals or biofuels, by leveraging spectral tuning to enhance metabolic efficiency and predicting particular growth phases using growth kinetics.
Co-Authors Amelia, Ria Ardipeni, Witia Arief Budiman Astiti, Adam Cindiati, Maya Devi Anggraini, Irika Dinda Khairunnisa, Dinda Dwi Umi Siswanti Eko Agus Suyono Eko Agus Suyono Hardianto, Muhammad Andhi Hermin Pancasakti Kusumaningrum Karilanata, Khalid Erlangga Kurnianto, Dedy Larasati, Ersi Luthfiana, Dwi Hardianti Maggandari, Revata Maghfiroh, Khusnul Qonita Mardyansah, Deviko Marno, Septhian Maulana, Sofyan Mawarni, Shelina Nurunnisa Mufida, Na’imatul Natalia, Fitri Nugroho Dewayanto, Nugroho Nurafifah, Istini Nurul Hida, Aulia Setyo Putri, Renata Adaranyssa Egistha Qonita Maghfiroh, Khusnul Rejeki Siti Ferniah Rizko, Nurmalisa Ryan Sadewo, Brilian Sadewo, Brilian Ryan Siti Ferniah, Rejeki siti mudrikah Solly Aryza Sri Pujiyanto Suyono, Eko Agus Agus Tri Rahayu, Hesti Wulandari, Ismia