Comparative Analysis of Essential Oil Components of Bergamot from Different Origins by GC-MS

The components of essential oil of fresh fruit of bergamot from different origins were compared and analyzed.The essential oil of fresh fruit of bergamot from 10 batches were extracted by steam distillation and the yields were calculated. The components of the samples were analyzed by GC-MS, correlation analysis and cluster analysis.The results showed that a total of 117 compounds were identified in the essential oil of fresh fruit of bergamot from 10 batches, they were mainly monoterpenes, alcohols and sesquiterpenes, among which (+)-dipentene and γ-terpinene were the most abundant components.There were 9 common components and some of which were significantly correlated with each other by correlation analysis(P<0.05).Cluster analysis divided bergamot from 10 batches into 4 categories: S1 and S2 were grouped into one class, S6, S7 and S9 were grouped into one class, S3, S4, S5 and S8 were grouped into one class, and S10 was grouped into one class.In summary, there are some differences of the components in essential oil of bergamot from different origins, and the content of the same component also has great differences in essential oil of bergamot from different origins.