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Journal of Pharmaceutical and Applied Chemistry
An International Journal


Volumes > Vol. 5 > No. 2


Effect of γ-Irradiation on Stability of Cyanobacteria Spirulina platensis Intact Cells

PP: 75-80
J. Monaselidze, E. Gelagutashvili, N. Bagdavadze, A. Gongadze, M. Gogebashvili, N. Ivanishvili, M. Gorgoshidze,
Effect of 7.2kGy 137Cs gamma irradiation have been studied with optical and differential scanning microcalorimetry methods for cyanobacterium (blue-green algae) Spirulina platensis intact cells in the suspension wet and dry mass samples. It was shown that all sample versions of Spirulina platensis is radioresistant, when the algae is irradiated with high doses of 137Cs gamma irradiation. It was shown that irradiation caused a decrease in intensity of optical absorption spectra only. However, the heat absorption spectrum detected demonstrates a decrease in heat absorption intensity and also heat redistribution along the temperature scale. Namely, the heat absorption intensive peak at 50C that corresponds C-phycocyanin disappears, and a complex calorimetry curve changes to a simpler curve with two heat absorption peaks around 70 and 93C, and the integral heat decreases by two times. After irradiation, the recultivated Spirulina platensis cell culture has the DSC profile that demonstrates full restoration of C-phycocyanin, melting temperature of which is by 6C higher comparing with the norm. Using the DSC data, we have calculated concentration of C-phycocyanin that equals to 355C.

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