Mixotrophic cultivation of Spirulina platensis in dairy wastewater: Effects on the production of biomass, biochemical composition and antioxidant capacity


Autoři: Maria I. B. Pereira aff001;  Bruna M. E. Chagas aff001;  Roberto Sassi aff002;  Guilherme F. Medeiros aff003;  Emerson M. Aguiar aff001;  Luiz H. F. Borba aff001;  Emanuelle P. E. Silva aff001;  Júlio C. Andrade Neto aff001;  Adriano H. N. Rangel aff001
Působiště autorů: Agricultural School of Jundiaí, Federal University of Rio Grande do Norte, Natal, RN, Brazil aff001;  Department of Systematic Ecology, Federal University of Paraíba, João Pessoa, PB, Brazil aff002;  Department of Oceanography and Limnology, Federal University of Rio Grande do Norte, Natal, RN, Brazil aff003
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0224294

Souhrn

Mixotrophic cultivation of microalgae provides a very promising alternative for producing carbohydrate-rich biomass to convert into bioethanol and value-added biocompounds, such as vitamins, pigments, proteins, lipids and antioxidant compounds. Spirulina platensis may present high yields of biomass and carbohydrates when it is grown under mixotrophic conditions using cheese whey. However, there are no previous studies evaluating the influence of this culture system on the profile of fatty acids or antioxidant compounds of this species, which are extremely important for food and pharmaceutical applications and would add value to the cultivation process. S. platensis presented higher specific growth rates, biomass productivity and carbohydrate content under mixotrophic conditions; however, the antioxidant capacity and the protein and lipid content were lower than that of the autotrophic culture. The maximum biomass yield was 2.98 ±0.07 g/L in growth medium with 5.0% whey. The phenolic compound concentration was the same for the biomass obtained under autotrophic and mixotrophic conditions with 2.5% and 5.0% whey. The phenolic compound concentrations showed no significant differences except for that in the growth medium with 10.0% whey, which presented an average value of 22.37±0.14 mg gallic acid/g. Mixotrophic cultivation of S. platensis using whey can be considered a viable alternative to reduce the costs of producing S. platensis biomass and carbohydrates, shorten cultivation time and produce carbohydrates, as it does not require adding expensive chemical nutrients to the growth medium and also takes advantage of cheese whey, an adverse dairy industry byproduct.

Klíčová slova:

Antioxidants – Carbohydrates – Fatty acids – Cheeses – Lipids – Phenols – Ecological productivity – Bioethanol


Zdroje

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2019 Číslo 10