Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/131603
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Type: Journal article
Title: Applying nanoparticle tracking analysis to characterize the polydispersity of aggregates resulting from tannin-polysaccharide interactions in wine-like media
Author: Li, S.
Wilkinson, K.L.
Mierczynska-Vasilev, A.
Bindon, K.A.
Citation: Molecules, 2019; 24(11):2100-1-2100-18
Publisher: MDPI AG
Issue Date: 2019
ISSN: 1420-3049
1420-3049
Statement of
Responsibility: 
Sijing Li, Kerry L. Wilkinson, Agnieszka Mierczynska-Vasilev and Keren A. Bindon
Abstract: Interactions between grape seed tannin and either a mannoprotein or an arabinogalactan in model wine solutions of different ethanol concentrations were characterized with nanoparticle tracking analysis (NTA), UV-visible spectroscopy and dynamic light scattering (DLS). NTA results reflected a shift in particle size distribution due to aggregation. Furthermore, the light scattering intensity of each tracked particle measured by NTA demonstrated the presence of aggregates, even when a shift in particle size was not apparent. Mannoprotein and arabinogalactan behaved differently when combined with seed tannin. Mannoprotein formed large, highly light-scattering aggregates, while arabinogalactan exhibited only weak interactions with seed tannin. A 3% difference in alcohol concentration of the model solution (12 vs. 15% v/v) was sufficient to affect the interactions between mannoprotein and tannin when the tannin concentration was high. In summary, this study showed that NTA is a promising tool for measuring polydisperse samples of grape and wine macromolecules, and their aggregates under wine-like conditions. The implications for wine colloidal properties are discussed based on these results.
Keywords: mannoprotein
arabinogalactan
seed tannin
aggregation
nanoparticle tracking analysis
Description: Published: 3 June 2019
Rights: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
DOI: 10.3390/molecules24112100
Grant ID: http://purl.org/au-research/grants/arc/IC130100005
Appears in Collections:Agriculture, Food and Wine publications
ARC Training Centre for Innovative Wine Production publications
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