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Molecular study of mucin-procyanidin interaction by fluorescence quenching and Saturation Transfer Difference (STD)-NMR

Title
Molecular study of mucin-procyanidin interaction by fluorescence quenching and Saturation Transfer Difference (STD)-NMR
Type
Article in International Scientific Journal
Year
2017
Authors
Brandao, E
(Author)
Other
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Silva, MS
(Author)
Other
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Garcia Estevez, I
(Author)
Other
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Victor de Freitas
(Author)
FCUP
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Susana Soares
(Author)
FCUP
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Journal
Title: Food ChemistryImported from Authenticus Search for Journal Publications
Vol. 228
Pages: 427-434
ISSN: 0308-8146
Publisher: Elsevier
Other information
Authenticus ID: P-00M-F76
Abstract (EN): Astringency is closely related to the interaction between procyanidins and salivary proteins (SP). The aim of this work was to study the interaction between mucin, a SP responsible for saliva lubricating properties, with different procyanidins (B4 dimer, tetramer (TT) and fractions of oligomeric procyanidins), and the influence of several conditions [pH, ionic strength, procyanidins' mean degree of polymerization (mDP) and different solvents (ethanol or dimethylsulfoxide)] on this interaction by fluorescence quenching and Saturation Transfer Difference (STD)-NMR. For fractions of oligomeric procyanidins, the mucin-procyanidin interaction increased with mDP; however, for pure compounds, procyanidin TT has lower affinity than dimer B4 which could be due to a lower structural flexibility imposed by its complex structure. Furthermore, EtOH and DMSO can disrupt the main driving forces of these interactions, hydrophobic interactions and hydrogen bonds, respectively, lowering significantly the binding constants.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 8
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