Journal
JOURNAL OF PHYCOLOGY
Volume 51, Issue 4, Pages 659-669Publisher
WILEY
DOI: 10.1111/jpy.12308
Keywords
antimicrobial; antioxidant; chlorophyll; FAME; microalgae; phenolics
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Funding
- Claude Leon Foundation
- University of KwaZulu-Natal
- National Research Foundation, South Africa
- New Szechenyi Plan [TAMOP 4.2.2.A-11/1/KONV-2012-0003]
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The effect of nitrogen (N: low = 2% N or moderate = 10% N) levels and cultivation (photoautotrophic or mixotrophic) modes on the biochemicals in Chlorella minutissima was evaluated using a mass culture system. Moderate N and mixotrophic cultures had higher biomass, protein, carbohydrate content and photosynthetic pigments than the low N and photoautotrophic treatments. In contrast, lipid and fatty acid content of the low N and photoautotrophic treatments were higher than in the moderate N and mixotrophic cultures. More phytochemicals were accumulated in moderate N and mixotrophic cultures which corresponded to better antioxidant capacity in the extracts. The most potent (0.7 mg . mL(-1)) acetylcholinesterase inhibitory activity was displayed by moderate N and mixotrophic treatment. Approximately 60% of the extracts exhibited a noteworthy antimicrobial activity regardless of the N levels and cultivation modes. Thus, moderate N level enhanced the phytochemicals and biological activities of C. minutissima cultured under a mixotrophic system.
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