Abstract
This paper reports the effects of different culture conditions for Dunaliella salina SA32007 from Salar de Atacama (second Region, northern ofChile) over biomass, lipid production and triglycerides synthesis. A maximum value of microalgae density (8.2 × 109 Cells/L) and an intrinsic growth rate (0.17 d-1), were obtained using a culture with 0.5 mol/L of NaCl and a nitrogen/phosphorous (N/P) limitation of 14/1. The triglycerides production was significantly favoured under nitrogen deficiency conditions (Mann-Whitney test; p = 0.0043). However there was a nitrogen-limiting threshold for the stimulation and accumulation of triglycerides (N/P: 14/1), lower than that limit, these compounds would not be accumulated. It was also observed that triglyceride content was not proportional to the total lipid content and the maximum number of cells. The aeration system employed stimulated the growth and synthesis of structural organic molecules. Regarding microalgae growth stage subjected to nitrogen deficiency, when the deficit was applied before the lag phase, the negative effect on the biomass and the triglycerides production decreased.
Highlights
There is a worldwide crisis due to the need of new sources of energy
This paper reports the effects of different culture conditions for Dunaliella salina SA32007 from Salar de Atacama over biomass, lipid production and triglycerides synthesis
Biodiesel generated from algae offers many advantages, e.g. during algae photosynthesis the atmospheric CO2 is fixed at a similar rate to that produced during combustion process of biodiesel [5,6], the balance of CO2 pollution generated is virtually zero
Summary
There is a worldwide crisis due to the need of new sources of energy. Various disciplines are looking for new conventional and renewable materials to generate heat energy [1]. The oil quality for biodiesel production is not always appropriate because it has low triglycerides content, and high concentration of free fatty acids The latter can interfere with the trans-esterification process required for the biofuel obtaining [4]. The objective of this study was the assay of specific conditions in salinity and nitrogen deficiency and air bubbling that could stimulate the triglycerides production, while the negative effect over the biomass is mitigated. This will be carried out by a strain of Dunaliella salina SA32007, isolated from the Salar de Atacama, II Region—Chile, in order to potentiate biotechnological properties of the local microorganisms
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