Comparative evaluation of oil obtained by different extraction methods from kinnow peel

Essential oils obtained from citrus peel find potential use in flavor and fragrance industry. In present study, oil from Kinnow peel was extracted using five different oil extraction methods (physical method, physical and hydro-distillation combined, and from hydro-distillation of fresh, mechanical dried and solar dried peel). Different methods include essential oil from physical method (II), physical and hydro-distillation combined (I), and from hydro-distillation of fresh (III), mechanical dried (1V) and solar dried peel (V). Essential oils obtained were further compared on the basis of yield, extraction time, colour and quality characteristics of the essential oils isolated. it was observed that essential oil yield from physical method and physical combined with distillation method was 0.177g/100g and 0.291g/100g, respectively. the hydro-distilled essential oil content from fresh, mechanical and solar dried peels of Kinnow mandarin was 0.365g/100g, 0.910g/100g and 0.617g/100g. both yield and extraction time vary significantly (p<0.01) with respect to extraction methods. Highest redness value (16.2) was obtained by oil obtained using physical method. Physical method oil showed highest color difference (ΔE) and lowest Lightness difference (ΔL). Physiochemical analysis of oils showed saponification value of 181.73–186.90 mg KOH/g; acid value 3.46–5.02 mg KOH/g; refractive index 1.36–1.48, specific gravity 0.80–0.87 and these were insoluble in water.