When long-chain saturated and unsaturated fatty acids were incubated with c
rude enzyme of marine green alga Ulva pertusa, the corresponding (R)-2-hydr
operoxy acids were found to have high enantiomeric excess (> 99%). In a sim
ilar administration experiment, the (R)-2-hydroperoxy acid was obtained fro
m the incubation of palmitic acid with crude enzymes of a variety of marine
algae. Thus, we found that not only green algae but also brown and red alg
ae are capable of enantioselective 2-hydroperoxylation of palmitic acid.