Abstract
In this work, black rosehip was used as potent natural pigment source due to its anthocyanin content. To obtain these pigments, supercritical carbon dioxide extraction considered as a green extraction technique was employed. The effects of carbon dioxide pressure (150-350 bar), temperature (40-60°C) and co-solvent (ethanol) concentration (20-100%) on extraction of total anthocyanins were optimized using the Response-Surface Method according to the Box-Behnken model. Extraction of anthocyanins was successfully achieved when aqueous ethanol used as co-solvent. The most effective variables were co-solvent composition and pressure and temperature interaction (p<0.005). Optimum extraction conditions were elicited as the highest pressure (350 bar) and temperature (60°C) conditions and the ethanol concentration close to the center point values of 60% (54-55%). According to the results obtained, it was understood that the ethanol concentration should remain below 60%. In addition, extraction efficiency was found to be very low in processes using absolute ethanol. Finally; the model was validated. When the estimated total anthocyanin amount (R2 = 0.8936) was compared to the actual measured values, the values were found to be close to each other.
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