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

Madhubalaji, C. K. and Sarat Chandra, T. and Chauhan, V. S. and Sarada, R. and Sandeep, N. Mudliar (2020) Chlorella vulgaris cultivation in airlift photobioreactor with transparent draft tube: effect of hydrodynamics, light and carbon dioxide on biochemical profile particularly w-6/w-3 fatty acid ratio. Journal of Food Science and Technology, 57 (3). pp. 866-876. ISSN 0022-1155

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Abstract

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 lmol m-2 s-1), photoperiod (12–24 h) and gas-phase carbon dioxide (CO2) concentration (5–15% v/v) were evaluated on microalgae and associated bacterial growth, biochemical profile; with special emphasis on x-3, x-6 fatty acids, and vitamin B12. The optimal growth of C. vulgaris without CO2 supplementation was observed at 1.2 vvm, which was associated with higher algal productivity, chlorophyll, vitamin B12 content, and bacterial load along with 72% of nitrate removal. The higher light intensity (400 lmol m-2 s-1) and photoperiod (24:0) increased biomass productivity and x-3 fatty acid content (in lipid) up to 2–3 fold. The elevated levels of gas-phase CO2 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 CO2 concentration lowered vitamin B12 content (up to 30%) and bacterial load (2–3 log). Also, all the cultivation conditions favoured desirable x-6/x-3 ratio(in the range of 1–2).

Item Type: Article
Uncontrolled Keywords: Airlift photobioreactor C. vulgaris CO2 supplementation w-3 and w-6 fatty acids Vitamin B12
Subjects: 500 Natural Sciences and Mathematics > 07 Life Sciences > 04 Microbiology > 01 Algae
600 Technology > 08 Food technology > 18 Processed foods > 04 Functional foods
Divisions: Plant Cell Biotechnology
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 27 Feb 2020 10:47
Last Modified: 27 Feb 2020 10:47
URI: http://ir.cftri.com/id/eprint/14222

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