The use of Spirulina (Arthospira sp) as a food source has stood out for being a potential source of proteins, fatty acids, vitamins and others. However, the cultivation medium for its production is still expensive. We observed that in hydroponics systems a solution rich in nutrients is used but that soon needs to be discarded. Thus, we envision that a low-cost alternative for the cultivation of Spirulina would be this waste coming from hydroponic cultivation. The aim of this work was to characterize the biomass of Arthospira sp grown in alternative culture media based on hydroponic effluent through a systematic review. The study concludes the need to supplement the residual medium with synthetic medium for its use.
Resumo: Existe um grande potencial associado a microrganismos na atualidade como forma alternativa de alimento, porém isso depende das suas condições de crescimento: pH, luz, temperatura e uma solução contendo NPK. Neste trabalho, o objetivo foi comparar um efluente de drenagem de cultivo de hidroponia de tomate com os meios de cultura artificial Zarrouk e Raos para verificar sua viabilidade como meio de cultivo alternativo para a Arthrospira platensis. Realizou-se o cultivo da Arthrospira empregando diferente concentrações: 25%, 50%, 75% e 100% de efluente avolumado com meio Zarrouk e dois meios de controle (Raos e Zarrouk). Verificou-se que é possível utilizar o efluente de drenagem para cultivo de Arthospira, contudo, quanto maior a concentração, maior a inibição da microalga. Palavras-Chave: Arthrospira platensis; efluente de drenagem de hidroponia; Meio de cultivo alternativo; meio Zarrouk; Meio Raos.
The use of Spirulina (Arthospira sp) as a food source has stood out for being a potential source of proteins, fatty acids, vitamins, and others. However, the cultivation medium for its production is relatively expensive. Then, an alternative culture medium is necessary for reducing costs. So, hydroponics drainage effluent, a solution rich in nutrients, represents an alternative source of substrate for microorganism cultivation. Thus, this work aimed to characterize the biomass of Arthospira sp grown in an alternative culture medium based on hydroponic effluent through a systematic review. We noted a trend to reduce biomass growth and bioactive compounds due to an excess of iron and copper in the effluent. The study concluded that it needs to supplement the residual medium with a synthetic medium for its use to obtain biomass for commercial utilization.
Schinus terebinthifolius Raddi is a plant rich in nutrients and is used medicinally and industrially. Supercritical oil extraction from S. terebinthifolius can result in higher value-added products. Mathematical models (Sovová and Esquível) are used to describe the behavior of supercritical extractions. This study aims to compare both models in terms of yields in conditions of 223 bar and 50°C. We observed that the model proposed by Sovová provided good reproducibility and representativeness.
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