authors |
de Melo, MMR; Sapatinha, M; Pinheiro, J; Lemos, MFL; Bandarra, NM; Batista, I; Paulo, MC; Coutinho, J; Saraiva, JA; Portugal, I; Silva, CM |
nationality |
International |
journal |
JOURNAL OF CO2 UTILIZATION |
author keywords |
Aurantiochytrium sp.; Design of experiments; Docosahexaenoic acid; Microalgae; Supercritical fluid extraction |
keywords |
CARBON-DIOXIDE EXTRACTION; EUCALYPTUS-GLOBULUS BARK; FLUID EXTRACTION; DOCOSAHEXAENOIC ACID; OPTIMIZATION; MICROALGAE; CAROTENOIDS; OIL; METHODOLOGY; LYCOPENE |
abstract |
The microalgae Aurantiochytrium sp. is a strong alternative source of omega-3 fatty acids, including docosahexaenoic acid (DHA). This work encompasses the optimization of SFE conditions to maximize the total extraction yield eta(Total)), DHA content (C-DHA), total phenolics content (TPC), and antioxidant capacity (AOC) of the extracts produced from Aurantiochytrium sp. biomass. A full factorial experimental plan was performed, comprising three factors (pressure, temperature, and flow rate) and two levels (200 - 300 bar, 40 - 80 degrees C, and 6-12 g min(-1), respectively). The maximum and minimum experimental results were eta(Total) = 2.1 and 13.4 wt%, C-DHA= 27.3 and 39.3 wt. %, TPC = 1.19 and 2.24 mg(GAE )g(extract)(-)1 and AOC = 0.3 and 1.4 mg(TEAC )g(extract)(-1). Under the studied experimental conditions, increasing pressure up to 300 bar is the optimum to rise both eta(Total) and C-DHA. Temperature increase from 40 to 80 degrees C leads to opposing effects: it favors the concentration of phenolics in the supercritical extracts at the expenses of decreasing DHA content and total yield. Surface models were adjusted to eta(Total), C-DHA and TPC data, and the goodness of the fits ranged from coefficients of determination of 0.752-0.711 (TPC) to 0.997-0.994 (C-DHA). Under optimized conditions, supercritical extracts exhibited a DHA content more than 3.5-fold richer than fish oil, and 7.9-fold richer than the best alternative microalgae species (Pavlova lutheri) found in the literature. |
publisher |
ELSEVIER SCI LTD |
issn |
2212-9820 |
isbn |
2212-9839 |
year published |
2020 |
volume |
38 |
beginning page |
24 |
ending page |
31 |
digital object identifier (doi) |
10.1016/j.jcou.2020.01.014 |
web of science category |
Chemistry, Multidisciplinary; Engineering, Chemical |
subject category |
Chemistry; Engineering |
unique article identifier |
WOS:000531069900004
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ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
5.993 |
5 year journal impact factor |
6.193 |
category normalized journal impact factor percentile |
85.534 |
dimensions (citation analysis):
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altmetrics (social interaction):
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