Volatile components of peel cold-pressed oils of two cultivars of sweet orange (Citrus sinensis (L.) Osbeck) from Ethiopia
✍ Scribed by S.B. Mitiku; M. Sawamura; T. Itoh; H. Ukeda
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 72 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0882-5734
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✦ Synopsis
Cold!pressed fruit peel essential oils of two cultivars of sweet orange "Citrus sinensis "L[# Osbeck#\ Valencia and Hamlin\ from Ethiopia were analyzed by capillary GC and GCÐMS\ without prior separation\ and compared with each other[ On two di}erent GC columns\ 47 components representing an average of 88[8) of the total volatile fraction were positively identi_ed[ trans!carveol was proved for the _rst time as one of the components in cold!pressed orange oils[ Monoterpene hydrocarbons followed by aldehydes and alcohols were the predominate quantitative composition of the volatile part in both the Valencia and Hamlin oils[ Their percentage compositions\ respectively\ were 87[50) and 88[03) in total monoterpene hydrocarbons\ 9[65) and 9[38) in aliphatic and terpenic aldehydes\ and 9[36) and 9[07) in total alcohol concentration[ In the cold!pressed oil of Valencia\ oxygenated volatiles amounted to 0[15)\ while in Hamlin amounted to only 9[69)[ Compared to the same cultivars recently reported from other countries\ high concentration of neral "9[98)# and geranial "9[05)# were found in Valencia orange oil[ The major aliphatic aldehydes quanti_ed in both oils are n! octanal and n!decanal\ which are especially important character!impact constituents of sweet orange oils[ Values for individual components like n!octanal\ n!decanal and linalol were above\ below or within values reported earlier[ Copyright Þ 1999 John Wiley