{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T16:59:23Z","timestamp":1791305963682,"version":"4.3.1"},"reference-count":38,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2012,3,16]],"date-time":"2012-03-16T00:00:00Z","timestamp":1331856000000},"content-version":"vor","delay-in-days":15,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Mass. Spectrom."],"published-print":{"date-parts":[[2012,3]]},"abstract":"<jats:p>Comprehensive analysis of high\u2010resolution mass spectra of aged natural dammar resin obtained with Fourier transform ion cyclotron resonance mass spectrometer (FT\u2010ICR\u2010MS) using matrix\u2010assisted laser desorption\/ionization (MALDI) and atmospheric pressure chemical ionization (APCI) is presented. Dammar resin is one of the most important components of painting varnishes. Dammar resin is a terpenoid resin (dominated by triterpenoids) with intrinsically very complex composition. This complexity further increases with aging.<\/jats:p><jats:p>Ten different solvents and two\u2010component solvent mixtures were tested for sample preparation. The most suitable solvent mixtures for the MALDI\u2010FT\u2010ICR\u2010MS analysis were dichloromethane\u2010acetone and dichloromethane\u2010ethanol. The obtained MALDI\u2010FTMS mass spectrum contains nine clusters of peaks in the m\/z range of 420\u20132200, and the obtained APCI\u2010FTMS mass spectrum contains three clusters of peaks in the m\/z range of 380\u2013910. The peaks in the clusters correspond to the oxygenated derivatives of terpenoids differing by the number of C<jats:sub>15<\/jats:sub>H<jats:sub>24<\/jats:sub> units. The clusters, in turn, are composed of subclusters differing by the number of oxygen atoms in the molecules.<\/jats:p><jats:p>Thorough analysis and identification of the components (or groups of components) by their accurate m\/z ratios was carried out, and molecular formulas (elemental compositions) of all major peaks in the MALDI\u2010FTMS and APCI\u2010FTMS spectra were identified (and groups of possible isomeric compounds were proposed). In the MALDI\u2010FTMS and APCI\u2010FTMS mass spectrum, besides the oxidized C<jats:sub>30<\/jats:sub>, triterpenoids also peaks corresponding to C<jats:sub>29<\/jats:sub> and C<jats:sub>31<\/jats:sub> derivatives of triterpenoids (demethylated and methylated, correspondingly) were detected.<\/jats:p><jats:p>MALDI and APCI are complementary ionization sources for the analysis of natural dammar resin. In the MALDI source, preferably polar (extensively oxidized) components of the resin are ionized (mostly as Na<jats:sup>+<\/jats:sup> adducts), whereas in the APCI source, preferably nonpolar (hydrocarbon and slightly oxidized) compounds are ionized (by protonation). Either of the two ionization methods, when used alone, gives an incomplete picture of the dammar resin composition. Copyright \u00a9 2012 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/jms.2971","type":"journal-article","created":{"date-parts":[[2012,3,16]],"date-time":"2012-03-16T21:55:40Z","timestamp":1331934940000},"page":"392-409","source":"Crossref","is-referenced-by-count":36,"title":["Analysis of dammar resin with MALDI\u2010FT\u2010ICR\u2010MS and APCI\u2010FT\u2010ICR\u2010MS"],"prefix":"10.1002","volume":"47","author":[{"given":"Signe","family":"Vahur","sequence":"first","affiliation":[{"name":"Institute of Chemistry, Faculty of Science and Technology University of Tartu  Ravila 14A 50411 Tartu Estonia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anu","family":"Teearu","sequence":"additional","affiliation":[{"name":"Institute of Chemistry, Faculty of Science and Technology University of Tartu  Ravila 14A 50411 Tartu Estonia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"T\u00f5iv","family":"Haljasorg","sequence":"additional","affiliation":[{"name":"Institute of Chemistry, Faculty of Science and Technology University of Tartu  Ravila 14A 50411 Tartu Estonia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Piia","family":"Burk","sequence":"additional","affiliation":[{"name":"Institute of Chemistry, Faculty of Science and Technology University of Tartu  Ravila 14A 50411 Tartu Estonia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ivo","family":"Leito","sequence":"additional","affiliation":[{"name":"Institute of Chemistry, Faculty of Science and Technology University of Tartu  Ravila 14A 50411 Tartu Estonia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ivari","family":"Kaljurand","sequence":"additional","affiliation":[{"name":"Institute of Chemistry, Faculty of Science and Technology University of Tartu  Ravila 14A 50411 Tartu Estonia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2012,3,16]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1098-2787(1998)17:5<337::AID-MAS2>3.0.CO;2-S"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1081\/ASR-120014277"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1255\/ejms.732"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1098-2787(1999)18:6<349::AID-MAS1>3.0.CO;2-H"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/9783527610464"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11745-001-0725-5"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1021\/ac902856t"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.1124619"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jasms.2004.04.031"},{"key":"e_1_2_6_11_1","volume-title":"Fourier Transform Mass Spectrometry","author":"McIver R. 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