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Gokce Guney

Gokce Guney

Dokuz Eylul University, Turkey

Title: Investigation of Monod and inhibition kinetics during 1-butanol and terpenoids production from CO2 by S. elongatus

Biography

Biography: Gokce Guney

Abstract

Fossil fuels, including oil, coal and natural gas, are providing about 85% of our energy need worldwide. The main drawback of fossil fuels is that it is a finite resource and will be depleted in the near future. Unlike fossil and nuclear fuels, alternative energy comes from natural resources (wind, sunlight, geothermal power and biomass) which are constantly replaced. Conversion of CO2 for the synthesis of chemicals by photosynthetic organisms is an attractive target for establishing independence from fossil reserves. Tremendous academic and industrial efforts have been made to produce 1-butanol, which is one major type of biofuel. Oxidised forms of carbon, CO2, can be used to synthesise energy-rich organic molecules. The terpenoids can be classified into monoterpenes (C10), sesquiterpenes (C15), diterpenes (C20), triterpenes (C30) and tetraterpenes (C40) according to the number of isoprene structures. The thermochemical and thermophysical properties of some monoterpenes, sesquiterpenes and their derivatives make them ideal candidates as ‘drop-in’ JP-8, gasoline and diesel fuels. In this study, it was studied the direct conversion of CO2 into reduced fuel compounds with a merit such as 1-butanol and terpenoids (limonene and bisabolene) using a Cyanobacteria namely S. elongatus isolated from Guzelyali-Izmir in Agean Sea (Turkey). The productions of 1-butanol and terpenoids (limonene     and bisabolene) by S. elongatus from CO2 were investigated. Under optimized conditions (0.5 mg L-1 dissolved oxygen, 0.8 mg L-1 NO3-N, 0.5 mg L-1 CaCl2) the growth kinetic depending on 1-butanol, bisabolene and limonene concentrations were detected under Monod kinetics. The effects of some environmental conditions on the 1-butanol and terpenoid (limonene and bisabolene) productions were investigated. The substrate accumulation and the low biomass/CO2 to 1-butanol, limonene and bisabolene yields were investigated with Lineawaever-Burck inhibition kinetics such as, non-competitive and un-competitive (Figure 1).