Chlorella vulgaris cultivation in airlift photobioreactor with transparent draft tube: effect of hydrodynamics, light and carbon dioxide on biochemical profile particularly ω-6/ω-3 fatty acid ratio.

Autor: Madhubalaji CK; 1Plant Cell Biotechnology Department, CSIR-Central Food Technological Research Institute, Mysore, Karnataka 570020 India.; 2Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India., Sarat Chandra T; 1Plant Cell Biotechnology Department, CSIR-Central Food Technological Research Institute, Mysore, Karnataka 570020 India., Chauhan VS; 1Plant Cell Biotechnology Department, CSIR-Central Food Technological Research Institute, Mysore, Karnataka 570020 India.; 2Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India., Sarada R; 1Plant Cell Biotechnology Department, CSIR-Central Food Technological Research Institute, Mysore, Karnataka 570020 India.; 2Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India., Mudliar SN; 1Plant Cell Biotechnology Department, CSIR-Central Food Technological Research Institute, Mysore, Karnataka 570020 India.; 2Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India.
Jazyk: angličtina
Zdroj: Journal of food science and technology [J Food Sci Technol] 2020 Mar; Vol. 57 (3), pp. 866-876. Date of Electronic Publication: 2019 Oct 12.
DOI: 10.1007/s13197-019-04118-5
Abstrakt: Chlorella vulgaris is used for food and feed applications due to its nutraceutical, antioxidant and anticancer properties. An airlift photobioreactor comprising transparent draft tube was used for C. vulgaris cultivation. The effect of reactor parameters like hydrodynamics (0.3-1.5 vvm), light intensity (85-400 μmol m -2  s -1 ), photoperiod (12-24 h) and gas-phase carbon dioxide (CO 2 ) concentration (5-15% v/v) were evaluated on microalgae and associated bacterial growth, biochemical profile; with special emphasis on ω-3, ω-6 fatty acids, and vitamin B 12 . The optimal growth of C. vulgaris without CO 2 supplementation was observed at 1.2 vvm, which was associated with higher algal productivity, chlorophyll, vitamin B 12 content, and bacterial load along with 72% of nitrate removal. The higher light intensity (400 μmol m -2  s -1 ) and photoperiod (24:0) increased biomass productivity and ω-3 fatty acid content (in lipid) up to 2-3 fold. The elevated levels of gas-phase CO 2 concentration (15% v/v) enhanced EPA content up to 7% and biomass productivity up to 171 mg L -1  day -1 . However, the increase in CO 2 concentration lowered vitamin B 12 content (up to 30%) and bacterial load (2-3 log). Also, all the cultivation conditions favoured desirable ω-6/ω-3 ratio(in the range of 1-2).
Competing Interests: Conflict of interestThe authors declare no conflict of interest.
(© Association of Food Scientists & Technologists (India) 2019.)
Databáze: MEDLINE
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