“…P. sapidus was also applied in the conversion of sesquiterpene, (+)-valencene to (+)-nootkatone, characterized with a grapefruit flavor even at a low odor threshold of about 1 µg/L in water [89]. The conversion was observed to be carried out through its enzyme valencene dioxygenase (ValOx) and through hydroperoxides derived from valencene, such as 6(R)-isopropenyl-4(R),4a(S)-dimethyl-2,3,4,4a,5,6,7,8octahydro-naphthalen-4(S)-yl-hydroperoxide and 6(R)-isopropenyl-4(R),4a(S)-dimethyl-2,3,4,4a,5,6,7,8-octahydro-naphthalen-2(R)-yl-hydroperoxide, which were rapidly converted to enones [44,90]. The selective and efficient allylic oxidation of (+)-valencene to (+)nootkatone sesquiterpene was also achieved with the use of the basidiomycete, P. sapidus in its lyophilized form.…”