Abstract
Alternative culture media have been evaluated for the cultivation of microalgae, among them are, industrial and agriculture wastewaters, that make residue recycling possible by bioconverting it into a rich, nourishing biomass that can be used as a feeding complement in aquaculture and in diverse areas. The objective of this research is to determine the lipid, fatty acid profile and carotenoid produced by the microalgae Chlorella vulgaris cultivated in a hydroponic wastewater, with different dilutions. The results showed that lipid contents did not present significant differences. Fatty acids were predominantly 16:0, 18:0, 18:1 and 18:3n-6. For total carotenoids, the dilution of hydroponic wastewater did not stimulate the production of these pigments. From this study, it was determined that, the use of hydroponic wastewater as an alternative culture medium for the cultivation of Chlorella vulgaris generates good perspectives for lipid, fatty acid and carotenoid production.
Highlights
An american called William Gericke suggested the word hydroponic to indicate the cultivation of plants in a liquid medium, making the cultivation of plants without soil popular in the 30 ́s (Jones Jr, 1982)
Its major importance is related to the quality of the produced fatty acids, where most of them are composed of unsaturated fatty acids, like linolenic, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) (Skjak-Braek, 1992)
Lipid contents did not show any significant differences (p > 0.05), the microalgae cultivated in HW25 presented the highest content among the other hydroponic wastewater solutions
Summary
An american called William Gericke suggested the word hydroponic to indicate the cultivation of plants in a liquid medium, making the cultivation of plants without soil popular in the 30 ́s (Jones Jr, 1982). The nutritive solution that feeds the plants, in the hydroponic technique, needs to be periodically replaced, offering a potentially nutritive residue solution. Some micro algae present a larger fatty acid spectrum, when compared to oleaginous plants, containing a molecular structure with even more than 18 carbons (Belarbi et al, 2000). They generate good perspectives for oil production and may produce thirty times more oil than soybean per unit area. Its major importance is related to the quality of the produced fatty acids, where most of them are composed of unsaturated fatty acids, like linolenic, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) (Skjak-Braek, 1992)
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