Comprehensive study of condensed tannins by ESI mass spectrometry: average degree of polymerisation and polymer distribution determination from mass spectra.
Anal Bioanal Chem
; 400(2): 613-23, 2011 Apr.
Article
em En
| MEDLINE
| ID: mdl-21359577
ABSTRACT
The determination of the molecular mass distribution of tannins is still a challenge. To elucidate it, mass spectrometry is potentially interesting, but many previous studies have highlighted that the mass spectra of a tannin fraction do not always reflect the actual abundance of different chain lengths. To clarify the potentialities offered by the MS approach, a comprehensive study involving different tannin fractions analysed under different conditions was conducted with an electrospray ionization (ESI) source. This study allowed optimised ESI-MS conditions to be established for analysing tannins but also it outlines the limits of detection encountered. If the detection of high molecular weight tannins seems difficult or even impossible, the spectral distortions brought about by this limitation are not totally related to the sole average degree of polymerisation of the tannin fraction studied but greatly depend on its polymer distribution. However, ESI-MS used under optimised conditions is a suitable method to study tannin composition of vegetable extracts which contain degree of polymerisations below 26.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Extratos Vegetais
/
Espectrometria de Massas por Ionização por Electrospray
/
Proantocianidinas
Tipo de estudo:
Evaluation_studies
Idioma:
En
Revista:
Anal Bioanal Chem
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
França