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Title:   Author  item
                                            Zeller, Wayneitem
                                            Schatz, Paul
  Submitted to: Journal of Agricultural and Food Chemistry
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 6/7/2017
                                    Publication  Date: 6/7/2017
                                    Citation: Zeller, W.E., Schatz, P.F. 2017. The U.S. Dairy Forage Research Center (USDFRC) condensed tannin NMR database. Journal of Agricultural and Food Chemistry. 65:5104-5106.Interpretive Summary: An important class of plant components contained in some foods and forages are called condensed tannins. Condensed tannins (CTs) belong to a class of compounds called polyphenols and have been shown to help protect protein from degradation, both during the ensiling process and during rumen digestion. CTs are also reported to provide human health benefits including anti-oxidant, anti-cancer and arterosclerosis prevention. However, it is widely recognized that these activities in humans and other mammals are dependent on the chemical structure of the CT. One of the major methods to determine chemical structure of CTs is nuclear magnetic resonance (NMR) spectroscopy. The literature contains a wealth of NMR information of CTs, but is spread out over decades of publications. Rapid access to this pertinent chemical information from the literature remains a challenge for scientists. This paper details compilation of these NMR data into a database that is searchable by structure, molecular formula, size of the CT, and NMR data. Citations for all literature references used in this database are also provided. The supplementary material for this paper provides a user guide for the successful operation of the database. The database will be periodically updated so that new NMR information will be incorporated as it becomes available. The database is available, free of charge, for use from the U.S. Dairy Forage Research Center (USDFRC) website. This database will be a valuable resource for numerous scientists working in the field of condensed tannin research.
                                Technical Abstract: This perspective describes a solution-state NMR database for flavan-3-ol monomers and condensed tannin dimers through tetramers obtained from the literature to 2015, containing data searchable by structure, molecular formula, degrees of polymerization, 1H and 13C chemical shifts of the condensed tannins. Citations for all literature references are provided and should serve as valuable resource for scientists working in the field of condensed tannin research. The database will be periodically updated as additional information becomes available, typically on a yearly basis and is available for use, free of charge, from the US Dairy Forage Research Center (USDFRC) website.


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