Hydrolyzable Tannins, Flavonol Glycosides, and Phenolic Acids Show Seasonal and Ontogenic Variation in Geranium sylvaticum

: Tuominen A, Salminen JP

Publisher: AMER CHEMICAL SOC

: 2017

: Journal of Agricultural and Food Chemistry

: JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY

: J AGR FOOD CHEM

: 65

: 31

: 6387

: 6403

: 17

: 0021-8561

: 1520-5118

DOI: https://doi.org/10.1021/acs.jafc.7b00918

The seasonal variation of polyphonols in the aboveground organs and roots Of Geranium sylvaticum in four populations was studied Using-UPLC-DADLESI-QqQ-MS/MS. The content of the main compound, geraniin, was highest (16% of dry weight) in the basal leaves after,the flowering period but stayed rather constant throughout the growing season. Compound-specific mass spectrometric methods revealed the different seasonal patterns. in minor polyphenols. Maximum contents of galloylglucoses and flavonol glycosides were detected in the small leaves in May, whereas the contents of further modified ellagitannins, such as ascorgeraniin and chebblagic acid, increased during the growing season. In flower organs, the polyphenol contents differed significantly between ontogenic phases so that maximum amounts were typically found in the bud phase, except in pistils the amount of gallotannins increased significantly in the fruit phase: These :results can be used in evaluating the role of polyphenols in plant herbivore interactions or in planning the best collection times of G. sylvaticum for compound isolation purposes.