Abstract
The effects of different ferrous sulfate (FeSO4) concentrations on the fatty acid profile of the blue-green alga Arthrospira platensis cultured in Zarrouk’s medium to produce biodiesel were studied. Different ferrous sulfate concentrations (0, 0.005, 0.01, 0.05, and 0.1 g/L) and 0.01 g/L were examined on the biochemical composition of the alga and fatty acids profile of A. platensis. Findings revealed that the highest and lowest yields of fatty acid were 0 and 0.1 g/L FeSO4, respectively. It was also noticed an increase of palmitic acid, oleic acid, linoleic acid, γ-linolenic acid, and docosahexaenoic acid when ferrous sulfate was between 0.05 and 0.1 g/L, while these fatty acids decreased at low concentration. Ferrous sulfate at a concentration of 0.1 g/L exhibited an increase and best yields in the following: growth rate and the shortest doubling time, chlorophyll-a, phycocyanin, allophycocyanin, phycobiliproteins, and carotenoids. Thus, increasing the FeSO4 concentration to 0.1 g/L has led to the increase in fatty acid individuals, which in turn, resulted in potential enhancement of the biodiesel production from A. platensis.
Highlights
The global population is expected to increase by 9 billion in 2050 [1], which will lead to more fossil fuel consumption with increasing greenhouse gas emissions (GHGs) [2]
The present study examined the potential of A. platensis to produce biodiesel
The fatty acid profile of the A. platensis revealed that palmitic, oleic acid, linoleic acid, γ-linolenic acid, and docosahexaenoic acid were most prevalent
Summary
The global population is expected to increase by 9 billion in 2050 [1], which will lead to more fossil fuel consumption with increasing greenhouse gas emissions (GHGs) [2]. Seeking another energy source is a necessity for reducing GHGs emissions, minimizing the dependence on fossil fuels, and maintaining environmental sustainability [3, 4]. In a comparison with conventional diesel, biodiesel can equilibrate the negative balance generated by the emission into the atmosphere. It reduces carbon monoxide (CO), sulfur compounds (SOx), and particulate matter (PM) emissions and having better lubricity and renewability [24]; it contributes to increasing nitrogen oxide (NOx) emissions [25]
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