Universität zu Köln

Kleinenkuhnen, Niklas, Buechel, Felix, Gerlich, Silke C., Kopriva, Stanislav ORCID: 0000-0002-7416-6551 and Metzger, Sabine (2019). A Novel Method for Identification and Quantification of Sulfated Flavonoids in Plants by Neutral Loss Scan Mass Spectrometry. Front. Plant Sci., 10. LAUSANNE: FRONTIERS MEDIA SA. ISSN 1664-462X

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Abstract

Sulfur is present in plants in a large range of essential primary metabolites, as well as in numerous natural products. Many of these secondary metabolites contain sulfur in the oxidized form of organic sulfate. However, except of glucosinolates, very little is known about other classes of such sulfated metabolites, mainly because of lack of specific and quantitative analytical methods. We developed an LC-MS method to analyze sulfated flavonoids, a group of sulfated secondary metabolites prominent, e.g., in plants of the genus Flaveria. The method uses a linear gradient of methanol/formic acid in water on a Restek Raptor C-18 Core-Shell column for separation of the compounds. The sulfated flavonoids are detected by mass spectrometry (MS) in a negative mode, using a neutral loss of 80 Da after a collision induced dissociation. With this method we were also able to quantify the sulfated flavonoids. We could detect all (mono) sulfated flavonoids described before in Flaveria plus a number of new ones, such as isorhamnetin-sulfate-glycoside. In addition, we showed that sulfated flavonoids represent a substantial sulfur pool in Flaveria, larger than the thiols glutathione and cysteine. The individual species possess different sulfated flavonoids, but there is no correlation between the qualitative pattern and type of photosynthesis. Similar to other sulfur-containing secondary compounds, the concentration of sulfated flavonoids in leaves is reduced by sulfur starvation. The new LC-MS method will enable qualitative and quantitative detection of these secondary metabolites in plants as a pre-requisite to addressing their functions.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kleinenkuhnen, Niklas UNSPECIFIED UNSPECIFIED UNSPECIFIED Buechel, Felix UNSPECIFIED UNSPECIFIED UNSPECIFIED Gerlich, Silke C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kopriva, Stanislav UNSPECIFIED orcid.org/0000-0002-7416-6551 UNSPECIFIED Metzger, Sabine UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-135454
DOI:	10.3389/fpls.2019.00885
Journal or Publication Title:	Front. Plant Sci.
Volume:	10
Date:	2019
Publisher:	FRONTIERS MEDIA SA
Place of Publication:	LAUSANNE
ISSN:	1664-462X
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Biology > Botanical Institute
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MOLECULAR CHARACTERIZATION; ARABIDOPSIS; ANTHOCYANINS; ANTIOXIDANT Multiple languages Plant Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13545