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Evaluations of Red Cabbage (Brassica oleracea L. Var. Capitata F. Rubra DC.) Extract Behavior under High Dose Gamma Irradiation

Aqueous solutions of different pH from red cabbage (Brassica oleracea L. var. capitata f. rubra DC.) extracts were prepared. Effects of different doses/dose rates of gamma irradiation on the red cabbage aqueous solutions were investigated. Solutions were exposed to 110 kGy of gamma irradiation doses at different rates ranged between 0.42513 to 38.883 kGy/h. The absorbance changes, which are due to gamma irradiation exposures, were determined by a spectrophotometry analysis. Results demonstrate that under gamma irradiation exposure variations (doses and dose rates), the best linearity (R2>0.97) of red cabbage solution extract was at a pH=3.3. Results could be of great importance and obviously indicated the efficacy of a natural red cabbage dye as dosimetric indicators.