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Maria Buchweitz, Gennadi Gudi, Reinhold Carle, Dietmar R. Kammerer and Hartwig Schulz Systematic investigations of anthocyanin–metal interactions by Raman spectroscopy Journal of Raman Spectroscopy 43

Version of Record online: 18 SEP 2012 | DOI: 10.1002/jrs.4123

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Raman spectra of the chloride salts of various anthocyanidin-3-glucosides, their structures at pH 5.0 and interaction with aluminium and ferric ions are presented and discussed for the first time. Formation of metal chelates is verified for anthocyanins in the presence of sugar beet pectin solutions, and the impact of pectin on chelate formation is investigated. Our results demonstrate that Raman spectroscopy is a very useful tool in studying anthocyanin – ferric and aluminium chelate formation.

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