The Proximate Composition and Growth of Spirulina platensis Biomass (Arthrospira platensis) at Different Temperatures

Spirulina platensis, Cyanobacteria was cultivated in a batch culture system at different temperature (30 +/- 1, 35 +/- 1 and 40 +/- 1 degrees C) for 10 days. The total volume of a glass container in batch culture was 2 L comprising of 1.9 L Spirulina medium and 0.1 L algae. It was determined to changes of cellular concentration, specific growth rate and proximate compositions (protein, lipid and total mineral substance) of Spirulina platensis which was produced in different temperature. Maximum cellular concentration of 30 and 40 degrees C in batch cultures was found at 3rd and 6th days, 6.783 and 6.333 g respectively. The highest cellular concentration was found out of 35 degrees C at 6th day as 7.967 g L-1. Maximum specific growth rate at 30 degrees C was found out at 4th day as 0.34 division day(-1). The highest specific growth rates at 35 and 40 degrees C was observed at 2nd day as 0.58 and 0.63 division day(-1), respectively. The most appropriate growth rate for S. platensis was detected at 35 degrees C. The results of proximate analysis showed that carbohydrate, TMS (Total Mineral Substance) and lipid levels increased protein levels decreased in parallel with the increase temperature of culture medium. A reduction of approximately 8.63% occurred in the protein levels, 11.44% increase in the lipid levels, 10.40% increase in the TMS levels and 19.95% increase in carbohydrate levels were observed.