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| Main Authors: | , , , , , |
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| Format: | Artículo científico |
| Language: | en |
| Published: |
Bioprocess and biosystems engineering
2026
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| Online Access: | https://pubmed.ncbi.nlm.nih.gov/42053644/ |
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Table of Contents:
- Application of magnetic fields to the microalgal cultivation of Nannochloropsis oceanica. Urrutia, Danielle Barros Machado, Bruno Roswag de Souza, Pedro Senger Mendes, Carlos Rafael Borges Roselet, Fabio Santos, Lucielen Oliveira Microalgae are microorganisms that exhibit variations in their biochemical structures which depend on the species and cultivation conditions. Microalgae produce a variety of biomolecules, including proteins, lipids, carbohydrates, and pigments, the levels of which depend on the species and cultivation conditions. Species that belong to genus Nannochloropsis, mainly Nannochloropsis oceanica, have been widely used in aquaculture. They are promising sources of biofuels and bioproducts because they produce high contents of proteins and lipids. This study aimed at evaluating the effect of 30 mT magnetic fields (MF) applied to cultivation of N. oceanica for different exposure periods (1 h d−1 and 24 h d−1) and photoperiods (12L:12D or 24L). Although no significant differences were observed in the growth rate, the combination of MF applied for 1 h d−1 and continuous light (24L) resulted in the highest biomass concentration and lipid accumulation (46.45%). Carbohydrate content ranged from 23.70 to 36.73%, and protein content from 14.80 to 36.43%, indicating that prolonged exposures may reduce proteins. The pigments showed remarkably high levels, especially violaxanthin (0.07 mg g−1), vaucheriaxanthin (0.11 mg g−1), and chlorophyll a (0.19 mg g−1), indicating enhancement of the xanthophyll metabolic pathway and photosynthetic stability. The biomass also exhibited moderate antioxidant activity (16—24%) in the ABTS and DPPH assays. Thus, the study showed that N. oceanica can grow under different conditions but stands out with 1 h d−1 of MF under continuous light as the most promising for enhancing biomass and lipids, with applications in biofuels, food, pharmaceuticals, and nutraceuticals.