The odor-active volatiles of Kinokuni mandarin (
Citrus kinokuni Hort. ex Tanaka), an original mandarin orange in Japan, were characterized by a combination of instrumental and sensory analyses and compared with those of Satsuma mandarin (
Citrus unshiu Marcovitch). An aroma extract dilution analysis (AEDA) of the polar fractions of Kinokuni and Satsuma mandarin peel oils identified five odorants in common as the most odor-active volatiles: (
Z)-hex-3-enal, decanal, linalool, yuzuol, and (2
E)-
trans-4,5-epoxydec-2-enal. In addition, seven odorants were identified solely in Kinokuni mandarin as significant contributors: octanal, dodecanal, (2
E,4
E)-deca-2,4-dienal, geraniol, yuzunone, (2
E,7
Z)-
trans-4,5-epoxydeca-2,7-dienal, and thymol. The odor-active volatiles in both the non-polar components of the peel oil and an extract of the juice prepared from Kinokuni mandarin were also identified. The (
S)-isomer of linalool in Kinokuni mandarin peel oil was dominant in the enantiomeric distribution (92%), whereas the (
R)-isomer was dominant in Satsuma mandarin peel oil (90%).
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