Isolation and structure determination of two novel C13(2))-OH bacteriopheophytin a allomers from a coastal salt pond sediment

摘要

We report the isolation and structure determination [RP-18 HPLC, UV-Vis, MS, H-1 NMR, and two-dimensional H-1 NMR (COSY and ROESY)] of two novel C(13(2))-OH bacteriopheophytin a allomers from a coastal salt pond sediment (Salt Pond, MA, USA). These allomers are formed by oxidative transformation of bacteriochlorophyll a and/or bacteriopheophytin a, and may play, through fossilization, an important role as intermediates on the formation of some ETIO porphyrins isolated early from sediments. (C) 2002 Elsevier Science Ltd. All rights reserved. [References: 24]