Application of Green Technology to Extract Clean and Safe Bioactive Compounds from Tetradesmus obliquus Biomass Grown in Poultry Wastewater

Microalgae are capable of assimilating nutrients from wastewater (WW), producing clean water and biomass rich in bioactive compounds that need to be recovered from inside the microalgal cell. This work investigated subcritical water (SW) extraction to collect high-value compounds from the microalga...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2023-03, Vol.28 (5), p.2397
Main Authors: Vladić, Jelena, Jazić, Jelena Molnar, Ferreira, Alice, Maletić, Snežana, Cvetković, Dragoljub, Agbaba, Jasmina, Vidović, Senka, Gouveia, Luisa
Format: Article
Language:English
Subjects:
Acids
Algae
Animal wastes
Animals
antioxidants
Aquatic microorganisms
Bioactive compounds
Biological activity
Biomass
Carbon
Chemical oxygen demand
Chlorophyceae
Clean technology
Contamination
Decomposition
Effluents
Environmental impact
Flavonoids
Hydrocarbons
Legislation
metal removal
Metals
Microalgae
Microorganisms
Nitrogen
nutrient recycling
Nutrients
Organic compounds
organic profile
Pathogens
Phenols
Phosphates
Phosphorus
Pollutants
Poultry
Squalene
subcritical water extraction
Technology
Tetradesmus obliquus
Wastewater
Water
Water treatment
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Summary:Microalgae are capable of assimilating nutrients from wastewater (WW), producing clean water and biomass rich in bioactive compounds that need to be recovered from inside the microalgal cell. This work investigated subcritical water (SW) extraction to collect high-value compounds from the microalga after treating poultry WW. The treatment efficiency was evaluated in terms of total Kjeldahl nitrogen (TKN), phosphate, chemical oxygen demand (COD) and metals. was able to remove 77% TKN, 50% phosphate, 84% COD, and metals (48-89%) within legislation values. SW extraction was performed at 170 °C and 30 bar for 10 min. SW allowed the extraction of total phenols (1.073 mg GAE/mL extract) and total flavonoids (0.111 mg CAT/mL extract) with high antioxidant activity (IC value, 7.18 µg/mL). The microalga was shown to be a source of organic compounds of commercial value (e.g., squalene). Finally, the SW conditions allowed the removal of pathogens and metals in the extracts and residues to values in accordance with legislation, assuring their safety for feed or agriculture applications.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules28052397