Stability and Photoisomerization of Stilbenes Isolated from the Bark of Norway Spruce Roots

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http://hdl.handle.net/10138/328576

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Latva-Mäenpää , H , Wufu , R , Mulat , D , Sarjala , T , Saranpää , P & Wähälä , K 2021 , ' Stability and Photoisomerization of Stilbenes Isolated from the Bark of Norway Spruce Roots ' , Molecules , vol. 26 , no. 4 , 1036 . https://doi.org/10.3390/molecules26041036

Title: Stability and Photoisomerization of Stilbenes Isolated from the Bark of Norway Spruce Roots
Author: Latva-Mäenpää, Harri; Wufu, Riziwanguli; Mulat, Daniel; Sarjala, Tytti; Saranpää, Pekka; Wähälä, Kristiina
Other contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry

Date: 2021-02
Language: eng
Number of pages: 15
Belongs to series: Molecules
ISSN: 1420-3049
DOI: https://doi.org/10.3390/molecules26041036
URI: http://hdl.handle.net/10138/328576
Abstract: Stilbenes or stilbenoids, major polyphenolic compounds of the bark of Norway spruce (Picea abies L. Karst), have potential future applications as drugs, preservatives and other functional ingredients due to their antioxidative, antibacterial and antifungal properties. Stilbenes are photosensitive and UV and fluorescent light induce trans to cis isomerisation via intramolecular cyclization. So far, the characterizations of possible new compounds derived from trans-stilbenes under UV light exposure have been mainly tentative based only on UV or MS spectra without utilizing more detailed structural spectroscopy techniques such as NMR. The objective of this work was to study the stability of biologically interesting and readily available stilbenes such as astringin and isorhapontin and their aglucones piceatannol and isorhapontigenin, which have not been studied previously. The effects of fluorescent and UV light and storage on the stability of trans stilbenes were assessed and the identification and characterisation of new compounds formed during our experiments were carried out by chromatographic (HPLC, GC) and spectroscopic techniques (UV, MS, NMR). The stilbenes undergo a trans to cis isomerisation under extended UV irradiation by intramolecular cyclisation (by the formation of a new C-C bond and the loss of two hydrogens) to phenanthrene structures. The characterised compounds are novel and not described previously.
Subject: stilbenes
spruce bark
UV-light
fluorescent light
photoisomerization
trans to cis isomerization
phenanthrenes
astringin
piceid
isorhapontin
piceatannol
isorhapontigenin
116 Chemical sciences
114 Physical sciences
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