Chemical profiles of birch and alder bark by ambient mass spectrometry

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Räsänen , R-M , Hieta , J-P , Immanen , J , Nieminen , K , Haavikko , R , Yli-Kauhaluoma , J & Kauppila , T J 2019 , ' Chemical profiles of birch and alder bark by ambient mass spectrometry ' , Analytical and Bioanalytical Chemistry , vol. 411 , no. 28 , pp. 7573-7583 . https://doi.org/10.1007/s00216-019-02171-9

Title: Chemical profiles of birch and alder bark by ambient mass spectrometry
Author: Räsänen, Riikka-Marjaana; Hieta, Juha-Pekka; Immanen, Juha; Nieminen, Kaisa; Haavikko, Raisa; Yli-Kauhaluoma, Jari; Kauppila, Tiina J.
Contributor: University of Helsinki, Division of Pharmaceutical Chemistry and Technology
University of Helsinki, Division of Pharmaceutical Chemistry and Technology
University of Helsinki, Organismal and Evolutionary Biology Research Programme
University of Helsinki, Division of Pharmaceutical Chemistry and Technology
University of Helsinki, Pharmaceutical Design and Discovery group
University of Helsinki, Department of Chemistry
Date: 2019-11
Language: eng
Number of pages: 11
Belongs to series: Analytical and Bioanalytical Chemistry
ISSN: 1618-2642
URI: http://hdl.handle.net/10138/308039
Abstract: Desorption atmospheric pressure photoionization (DAPPI) is an ambient mass spectrometry (MS) technique that allows the analysis of both polar and nonpolar compounds directly from the surfaces of various sample types. Here, DAPPI was used to study the chemical profiles in different parts of birch and alder tree barks. Four distinct fractions of Betula pendula (silver birch) bark were collected from three different developmental stages of the stem, after which the chemical profiles of the different tissue types were measured. Of special interest were triterpenoids, a class of important defensive substances, which are found in the bark of the silver birch. Additionally, the chemical profiles of lenticels and the surrounding surfaces in the phellem of B. pendula (silver birch), Alnus glutinosa (black alder), and Alnus incana (gray alder) were screened with DAPPI. Another ambient MS technique, laser ablation atmospheric pressure photoionization (LAAPPI), was further used for the mass spectrometry imaging of lenticels on the B. pendula phellem. All the studied birch bark fractions showed individual chemical profiles in DAPPI. The mass spectra from the young apical stem and the transition zone resembled each other more than the mature stem. Instead, the phellem was found to contain a high amount of triterpenoids in all the developmental stages of the stem. The most intense peaks in the DAPPI mass spectra of the birch bark fractions were those of betulin and lupeol. Betulinic and betulonic acid peaks were intense as well, and these compounds were detected especially in the lenticels of the tree samples.
Subject: ATMOSPHERIC-PRESSURE PHOTOIONIZATION
Ambient mass spectrometry
Bark
DESORPTION
DRUGS
Desorption atmospheric pressure photoionization
IONIZATION
LASER
Laser ablation atmospheric pressure photoionization
Mass spectrometry imaging
TRITERPENOIDS
Triterpenoid
116 Chemical sciences
114 Physical sciences
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