S02 - Session P5 - The Aromatic aromatic volatile pattern of leaves as the index of Citrus depressa and its seasonal variations

Authors: Shu-Yen Lin *

Citrus depressa is an aromatic and functional mandarin in Taiwan. Small fruits and sour flavour of C. depressa are easily confused with C. microcarpa and C. sunki . The unique fragrance of C. depressa is an effective feature to assist in its identification. In this study, we investigated the volatile organic compounds (VOCs) of fresh leaves of C. depressa , and the aromatic profiles from different seasons. Most VOCs are oxygenated monoterpenes, which accounted for 60.5% in C. depressa . The major compounds of C. depressa were linalool and γ-terpinene, which accounts for more than 70%, and can be confirmed as the chemotype of C. depressa . Among seasons, the ratio of oxygenated monoterpene to monoterpene hydrocarbons of C. depressa decreased in July but increased in September. In C. depressa , β-pinene and α-terpinolene, was the highest in July, and β-myrcene was only shown in September. However, the compositional ratio of predominant VOCs of fresh leaves in C. depressa has been stable. The cluster analysis showed that using VOCs of fresh leaves as the chemotaxonomic index for citrus is not affected by seasons. It can be a reliable profile as the intraspecific relationship.