Effects of varieties, pre-treatment and ultrasound assisted extraction on yields and characteristics of essential oils from young pomelo (Citrus Grandis L.) peels

Essential oils were extracted from two Vietnam local varieties of pomelo namely Citrus Grandis L. CV Nam Roi and Citrus Grandis L. CV Da Xanh. Storage methods by freezing or drying of young fruit peels affect the yield of extracted essential oils. The yield of essential oils obtained from Da Xanh variety was higher in Nam Roi variety. The extraction under ultrasound assisted condition increased the yield by two folds. The composition of volatile compounds in pomelo essential oils varied with different pomelo varieties and storage methods of the materials. The dominant compound in young peels essential oils Nam Roi, Da Xanh is limonene (55 – 90%). Nam Roi peels essential oils have antioxidant and antimicrobial activities (inhibition ability against Bacillus subtilis and Staphylococcus aureus ) higher than Da Xanh peels’ essential oils.