Resumo

DAVALOS, Juan Z et al. Characterization, by high resolution MALDI/FTICR mass spectrometry, of tara (Caesalpinia spinosa) hydrolysable tannins. Rev. Soc. Quím. Perú [online]. 2017, vol.83, n.1, pp.106-114. ISSN 1810-634X.

We have studied and characterized the structure of hydrolysable tannins of commercial powder tara, performed by means ultra-high-resolution mass spectrometry (MALDI/FT-ICR) without using separation techniques. Our experimental results, supported by computational calculations at DFT/ M05-2X level of theory, show that the identified species are basically oligomeric structures of polygalloyquinic acids, of the (C7H4O4)n(C7H12O6) type, composed by a chain of polygallic esters (depside) linked, via ester bond, to one quinic acid.

Palavras-chave : Caesalpinia spinosa; commercial tara powder; hydrolysable tannins; MALDI/FT-ICR; DFT/M05-2X theory; polygalloyquinic acids; gallic depsides.

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