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- Title
Essential oil constituents of three varieties of Kenyan sweet oranges ( Citrus sinensis).
- Authors
Njoroge, Simon Muhoho; Koaze, Hiroshi; Karanja, Paul Nyota; Sawamura, Masayoshi
- Abstract
The volatile components of peel essential oils of Salustiana ( Citrus sinensis Osbeck forma Salustiana), Valencia ( C. sinensis Osbeck forma Valencia) and Washington navel ( C. sinensis Osbeck forma Washington navel) sweet oranges grown in Kenya were isolated by cold-pressing and determined by GC and GC-MS. A total of 56 components were identified in Salustiana, 73 in Valencia and 72 in Washington navel peel oils. The identified components amounted to 98.7, 97.8 and 97.4% of the total volatiles of each oil, respectively. Monoterpene hydrocarbons largely dominated in the volatile fraction of the Salustiana (96.9%), Valencia (94.5%) and Washington navel (92.7%) oils. In each oil, limonene, α-pinene, sabinene and α-terpinene were the major compounds. Sesquiterpene hydrocarbons amounted to 0.1% of the total volatiles of Valencia and Washington navel oils, where ( E,E)- α-farnesene was the main compound. The total oxygenated compounds amounted to 1.7, 3.4 and 4.5% of the Salustiana, Valencia and Washington navel volatiles. Linalool, decanal, ( Z)-carvone, ( Z)-carveol, ( E)-carveol, nootkatone and sabina ketone were the main components. The three sweet orange varieties could be differentiated by the unique presence of α-phellandrene and γ-terpinene in Salustiana, β-phellandrene, ( Z)-nerolidol, aromadendrene in Valencia and p-cymene, β-sinensal and dodecanoic acid in Washington navel oils. Copyright © 2004 John Wiley & Sons, Ltd.
- Publication
Flavour & Fragrance Journal, 2005, Vol 20, Issue 1, p80
- ISSN
0882-5734
- Publication type
Article
- DOI
10.1002/ffj.1377