Using extraction, high pressure liquid chromatography (HPLC) and chrom
atography-mass spectrometry (GC-MS), isopentenyladenosine (i(6)Ado) wa
s identified from Laminaria japonica Aresch. Trans-zeatin (trans-Z) an
d trans-zeatin riboside (trans-ZR) were detected, but not verified aft
er GC-MS measurement.