Identification of the forms of boron in seaweed by 11BNMR

Free and complex forms of accumulated borate in seaweeds were identified by 11B N M R. The NMR spectra of green and red algae showed boric acid peaks mainly. In contrast, brown algae gave two distinctive peaks predominantly containing borate diesters. To identify the moiety coupled to borate, borate...

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Published inPhytochemistry (Oxford) Vol. 46; no. 2; pp. 209 - 213
Main Authors Chuda, Yoshihiro, Ohnishi-Kameyama, Mayumi, Nagata, Tadahiro
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.09.1997
Subjects
Rhodophyta
boric acid
Chlorophyta
11B NMR
Phaeophyta
boron complex
algae
mannitol
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Summary:Free and complex forms of accumulated borate in seaweeds were identified by 11B N M R. The NMR spectra of green and red algae showed boric acid peaks mainly. In contrast, brown algae gave two distinctive peaks predominantly containing borate diesters. To identify the moiety coupled to borate, borate complexes with compounds containing vicinal hydroxy groups, such as mannitol, laminarin and alginic acid, were prepared and examined. The results strongly indicated that mannitol formed the main diester complexes. The signal of the complexes was decreased rapidly after storage. Fresh brown algae, therefore, contain large amounts of B-carbohydrate complexes as do higher plants.
ISSN:0031-9422
1873-3700
DOI:10.1016/S0031-9422(97)00284-7