New report of Halamphora subtropica (Bacillariophyta) from the Strait of Malacca and its growth and biochemical characterisation under nutrient deprivation

Vello, Vejeysri and Phang, Siew-Moi and Poong, Sze-Wan and Lim, Yong-Kian and Ng, Fong-Lee and Shanmugam, Jayashree and Gopal, Mayakkannan (2023) New report of Halamphora subtropica (Bacillariophyta) from the Strait of Malacca and its growth and biochemical characterisation under nutrient deprivation. Regional Studies in Marine Science, 62. ISSN 2352-4855, DOI

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A symmetrical bi-raphid pennate diatom isolated from tropical coastal waters in the Strait of Malacca was identified as Halamphora subtropica, which is significant given that the distribution of this species was until now limited to subtropical waters in western Atlantic Ocean and western Pacific Ocean, hence its etymology. To assess its potential as biodiesel feedstock, the alga was cultivated, and its growth and biochemical composition compared under nutrient replete and nutrient (N, P, Si) deprived conditions. The growth of H. subtropica was more suppressed under N-conditions but was less affected under P-and/or Si-conditions. The highest biomass and lipid productivity of 19.7 +/- 0.8 and 4.0 +/- 0.4 mg L-1 day-1 respectively, were achieved under nutrient replete condition followed by P-and Si -conditions. Cells grown in nutrient-deprived media contain higher monounsaturated fatty acids while higher polyunsaturated fatty acids were observed in the complete medium. Palmitic acid, palmitoleic acid and stearic acid accounted for over 60% of the total fatty acids. The strain used in this study showed comparable values of biomass productivity, lipid productivity and lipid content (approximate to 30% dw) to diatom strains reported previously, suggesting that H. subtropica may be considered as a candidate for biofuel feedstock. These results contribute additional evidence on the potential of using tropical marine diatom strains as feedstock for biofuel, given that existing literature tend to focus on subtropical or temperate strains.(c) 2023 Elsevier B.V. All rights reserved.

Item Type: Article
Funders: Higher Institution entre of Excellence (HICoE) Programme [IOES-2014F], Impact -Oriented Inter-disciplinary Research Grant Programme (IIRG) IIRG016A-2019, UM Innovate Fund [PPSI-2020-HICOE-03]
Uncontrolled Keywords: Tropical diatom; Nutrient replete; Biomass productivity; Lipids productivity; Fatty acids
Subjects: Q Science > QL Zoology
Divisions: Faculty of Engineering > Department of Civil Engineering
Deputy Vice Chancellor (Research & Innovation) Office > Institute of Ocean and Earth Sciences
Depositing User: Ms Zaharah Ramly
Date Deposited: 07 May 2024 04:17
Last Modified: 07 May 2024 04:17

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