Further Investigation of Grapefruit Juice Flavor Components (Citrus paradisi M ACFAYDEN ). Valencane‐ and Eudesmane‐type Sesquiterpene Ketones

Fourteen sesquiterpene ketones D–Q pertaining to the valencane (D–J) and eudesmane (K–Q) groups have been identified for the first time in grapefruit juice flavor. These novel grapefruit constituents, which include the six new compounds I, J, L, M, N and O, were identified by direct comparison with synthetic samples. Organoleptically, their total contribution to grapefruit flavor is not negligible. In particular, (+)‐8,9‐didehydronootkatone (E) has a powerful flavor with good grapefruit juice character.