Biomass and RRR -[alpha]-tocopherol production in Stichococcus bacillaris strain siva2011 in a balloon bioreactor

Abstract

Doc number: 79

Abstract

Background: Green microalgae represent a renewable natural source of vitamin E. Its most bioactive form is the naturally occurring RRR -α-tocopherol which is biosynthesized in photosynthetic organisms as a single stereoisomer. It is noteworthy that the natural and synthetic α-tocopherols are different biomolecular entities. This article focuses on RRR -α-tocopherol production in Stichococcus bacillaris strain siva2011 biomass in a bioreactor culture with methyl jasmonate (MeJa) elicitor. Additionally, a nonlinear mathematical model was used to quantitatively scale-up and predict the biomass production in a 20 L balloon bioreactor with dual variables such as time and volume.

Results: Approximately 0.6 mg/g dry weight (DW) of RRR -α-tocopherol was enhanced in S. bacillaris strain siva2011 biomass with the MeJa 50 μL/L for 24 hrs elicitations when compared to the control. The R² value from the nonlinear model was enhanced up to 95% when compared to the linear model which significantly improved the accuracy for estimating S. bacillaris strain siva2011 biomass production in a balloon bioreactor.

Conclusions: S. bacillaris strain siva2011 is a new green microalga which biosynthesizes significant amounts of RRR -α-tocopherol. Systematically validated dual variable empirical data should provide key insights to multivariable or fourth order modeling for algal biomass scale-up. This bioprocess engineering should provide valuable information for industrial production of RRR -α-tocopherol from green cells.