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Origin and significance of 13(2)-hydroxychlorophyll derivatives in sediments

Walker, J. Stuart; Squier, Angela H.; Hodgson, Dominic A.; Keely, Brendan J.. 2002 Origin and significance of 13(2)-hydroxychlorophyll derivatives in sediments. Organic Geochemistry, 33 (12). 1667-1674. 10,1016/S0146-6380(02)00178-X

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Abstract/Summary

The authenticity of hydroxychlorophyllderivatives in sediments has been verified by subjecting pure chlorophyll preparations to the extraction method used for sediments. Model studies of chlorophyll autoxidation reveal hydroxychlorophyll as the major product formed in the presence of hydrogen peroxide. Its stability to further oxidation implies that hydroxychlorophyllderivatives are not precursors of aetioporphyrins and are more likely to produce cycloalkanoporphyrins via the processes of diagenesis. The occurrence of 132-hydroxyphaeophytin a throughout a sediment core from Loch Ness confirms it to be a widespread chlorophyll oxidation product formed during early diagenesis. Profiles of hydroxychlorophyllderivatives in a sediment core from an Antarctic lake demonstrate their potential for use as markers of oxidation processes in palaeoenvironmental assessment.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10,1016/S0146-6380(02)00178-X
Programmes: BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Signals in Antarctica of Past Global Changes
ISSN: 0146-6380
NORA Subject Terms: Chemistry
Date made live: 28 Mar 2012 08:33
URI: http://nora.nerc.ac.uk/id/eprint/17503

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