title: Oil from the tropical marine benthic-diatom Navicula sp.
abstract: The potential of the tropical marine benthic-diatom Navicula sp. for biodiesel feedstock was investigated. Growth profiles were analyzed by changing nutrient compositions in three different media (Walne, plain seawater, and modified seawater) and irradiance intensities. Navicula sp. cells showed significant growth in Walne and modified seawater medium but not in plain seawater medium. The microalgae grew well in a pH range of 7.8-8.4, and the cells were very sensitive to the intensity of direct sunlight exposure. The average cell concentration obtained from the cultures in plain seawater, Walne, and modified seawater media at the beginning of the stationary phase was 0.70, 2.17, and 2.54 g/L, respectively. Electron spray ionization-ion trap-mass spectrometry showed that the triacylglycerols of the algae oil were identified as POP (palmitic-oleic-palmitic), POO (palmitic-oleic-oleic), and OOLn (oleic-oleic-linoleic). The oil productivity of Navicula sp. cultivated in Walne and modified seawater media was 90 and 124 μL L(-1) culture d(-1). The Navicula sp. biodiesel exhibited a kinematic viscosity of 1.299 mm(2)/s, density of 0.8347 g/mL, and internal energy of 0.90 kJ/mL.
authors.affiliation: Biochemistry Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung, Indonesia. zeily@chem.itb.ac.id
authors.forename: Zeily
authors.initials: Z
authors.lastname: Nurachman
authors.forename: Dewi Susan
authors.initials: DS
authors.lastname: Brataningtyas
authors.lastname: Hartati
authors.forename: Lily Maria Goretty
authors.initials: LM
authors.lastname: Panggabean
mesh_terms: D059001:Aquatic Organisms / Q000737:chemistry*; D056804:Biofuels; D003470:Culture Media; D017377:Diatoms / Q000737:chemistry*; D019787:Linoleic Acid / Q000737:chemistry; D058086:Microalgae / Q000737:chemistry; D009821:Oils / Q000737:chemistry*; D019301:Oleic Acid / Q000737:chemistry; D010169:Palmitic Acids / Q000737:chemistry; D012623:Seawater / Q000737:chemistry*; D014280:Triglycerides / Q000737:chemistry
chemical_list: D056804:Biofuels; D003470:Culture Media; D009821:Oils; D010169:Palmitic Acids; D014280:Triglycerides; D019301:Oleic Acid; D019787:Linoleic Acid