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Development of an optimal light-feeding strategy coupled with semi-continuous reactor operation for simultaneous improvement of microalgal photosynthetic efficiency, lutein production and CO2 sequestration

Paper ID Volume ID Publish Year Pages File Format Full-Text
2739 129 2016 10 PDF Available
Title
Development of an optimal light-feeding strategy coupled with semi-continuous reactor operation for simultaneous improvement of microalgal photosynthetic efficiency, lutein production and CO2 sequestration
Abstract

•Incremental illumination reduced light-induced stress that influences lutein synthesis.•Linear light-feeding mode drastically enhanced both lutein productivity and content.•Optimal illumination strategy was integrated with semi-continuous reactor operation.•Integrated semi-continuous mode improved photosynthetic efficiency and lutein production .

In addition to leveraging some environmental and energy benefits, microalgae can also be used as a potentially sustainable source for carotenoids like lutein for healthcare applications. As light influences biosynthesis of lutein in microalgae, it would be interesting to investigate the role of incremental illumination in enhancing photosynthetic efficiency and consequent lutein production, while sequestering CO2 simultaneously. Thus, in this study, an optimal light feeding strategy coupled with a semi-continuous reactor operation was developed for achieving the above-mentioned goals. At a light intensity of 260 μmol m−2 s−1 as optimized in batch mode, baseline lutein productivity of 4.32 mg L−1 d−1 was obtained, when culturing Chlorella minutissima under optimal process conditions. On switching over to incremental illumination modes, the linear light-feeding (Strategy-III) resulted in higher lutein productivity of 5.35 mg L−1 d−1 with photosynthetic efficiency of 8.38%. When Strategy-III was integrated with semi-continuous mode involving 20% medium replenishment, lutein productivity, photosynthetic efficiency and CO2 sequestration rate were further enhanced by 19%, 41% and 34% respectively. Moreover, on this process optimization and integration, light-energy consumption was significantly reduced by 32%, in comparison with constant-illumination. Thus, this optimal production strategy resulted in significantly higher lutein productivity, content and photosynthetic efficiency, as compared to the relevant studies reported in literature.

Keywords
Microalgae; Lutein; Photosynthetic efficiency; CO2 sequestration; Incremental illumination strategy; Semi-continuous cultivation
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Development of an optimal light-feeding strategy coupled with semi-continuous reactor operation for simultaneous improvement of microalgal photosynthetic efficiency, lutein production and CO2 sequestration
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 113, 15 September 2016, Pages 47–56
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us