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Advisor(s)
Abstract(s)
(1) Background: Microalgae are promising feedstock for obtaining valuable bioactive
compounds. To facilitate the release of these important biomolecules from microalgae, effective cell
disruption is usually necessary, where the use of ultrasound has achieved considerable popularity as
an alternative to conventional methods. (2) Methods: This paper aims to evaluate the use of ultra-
sound technology in water medium as a green technology to recover high added-value compounds
from Dunaliella salina and improve its sensory profile towards a high level of incorporation into novel
food products. (3) Results: Among the variables, the solid concentration and extraction time have
the most significant impact on the process. For the extraction of protein, or fat, the most influential
factor is the extraction time. Total polyphenols are only significantly affected by the extraction time.
The antioxidant capacity is strongly affected by the solid to liquid ratio and, to a small extent, by the
extraction time. Ultrasound-assisted extraction improves the overall odor/aroma of D. salina with
good acceptability by the panelists. (4) Conclusions: The application of ultrasonic-assisted extraction
demonstrates a positive overall effect on enhancing the sensory profile, particularly the odor of
microalgal biomass, while the bioactive properties are preserved. Notably, the intense sea/fish odors
are reduced, while earthy and citrus notes become more prominent, resulting in an improved overall
sensory profile score. This is the first time, to our knowledge, that this innovative, green, and efficient
technology has been used to upgrade the aroma profile of microalgae.
Description
Keywords
Dunaliella salina ultrasound extraction bioactivities sensory analysis
Pedagogical Context
Citation
Ferreira, J.P.A.; Grácio, M.; Sousa, I.; Pagarete, A.; Nunes, M.C.; Raymundo, A. Tuning the Bioactive Properties of Dunaliella salina Water Extracts by Ultrasound-Assisted Extraction. Mar. Drugs 2023, 21, 472