抄録
We determined the stable carbon isotope compositions (δ13C values) of perylene and compounds coexisting with it to elucidate the precursor of perylene in sediments of Lake Biwa. Although we found a high amount of friedelin (6.5 μg g-1) in extracts, originating mainly from C3 angiosperms, its δ13C value (-30.8‰±0.1‰) was different from that of perylene (-27.8‰±0.3‰). The δ13C values of friedelin and perylene lay within the ranges for Japanese angiosperms (C3, -37.5‰ to -28.6‰) and gymnosperms (C3, -28.3‰ to -26.0‰), respectively. Since these values were clearly more negative than those of Japanese aquatic plants (C3, -16.5‰ to -14.6‰), it can be considered that the perylene originated from the land, principally from gymnosperms.
