Optimization of hydrodistillation and microwave assisted hydro distillation extraction of essential oil from Kinnow (Citrus Reticulate Blanco) peel: Response surface methodology

Abstract

 This study was planned to extract the essential oil from kinoow fruit peel. Peel collected from local vendor was dried and ground to powder. Further powder (100g) was dissolved in stipulated volume of water. A Box-Behnken design using response surface methodology (RSM) model was effectively used to optimize both processes (hydrodistillation and Microwave assisted extraction). The effects of material/solvent ratios (600-800mL), extraction time (4-6 h), extraction temperature (70-90 ^oC) and microwave power (200-600W) on the yield of Citrus reticulata Blanco Peel extraction of essential oils were studied. The result showed that the hydro-distillation technique showed minimum yield of 0.7% and maximum of 2.1%, whereas the microwave-aided extraction process produced minimum yield of 0.8% and maximum of 2.6% of essential oil. The best extraction conditions for kinnow essential oil were 70.69^o C, solvent/ material ratio of 769.16 mL, extraction duration of 4.41 h for hydro distillation 324.52^o C extraction power, 644.48 mL solvent ratio, and 12.20 min extraction duration for microwave assisted extraction.