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High\u2010resolution matrix\u2010assisted laser desorption\/ionization Fourier transform mass spectrometry (MALDI\u2010FTMS) was used as a rapid method for the determination of the exact elemental composition of the alteration products from diacylphosphatidylcholines and triacylglycerols. Light exposure of the egg tempera paints yields oxygenated diacylphosphatidylcholines and triacylglycerols. In the latter multiple incorporation of oxygen was observed as a recurring mass difference of 15.995, the exact atomic mass of oxygen. Owing to the high resolution of the FTMS data (routinely 20 000 at <jats:italic>m<\/jats:italic>\/<jats:italic>z<\/jats:italic> 1000 in broadband mode), oxidation products with different elemental compositions but identical nominal mass could be distinguished. Products of oxidative cleavage of triacylglycerols were observed in samples exposed for longer times. The relative intensities of the peaks of singly and multiply oxygenated triacylglycerols were used to derive the degree of oxygenation of the egg lipids in the tempera paint dosimeters. The degree of oxygenation was found to be directly related to the light exposure time. Exposure to elevated temperature (60 \u00b0C) for a period of 21 days did not lead to oxygenation of the triacylglycerols and diacylphosphatidylcholines. Exposure to NO<jats:sub><jats:italic>x<\/jats:italic><\/jats:sub> and SO<jats:sub>2<\/jats:sub> in the dark greatly increased the degree of oxygenation. Addition of lead\u2010 or copper\u2010containing pigments to the egg binding medium (and subsequent storage for 6 months in the dark) led to accelerated conversion of egg lipids to oxidised products. Copyright \u00a9 2001 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/jms.145","type":"journal-article","created":{"date-parts":[[2002,8,25]],"date-time":"2002-08-25T16:37:10Z","timestamp":1030293430000},"page":"479-492","source":"Crossref","is-referenced-by-count":55,"title":["Matrix\u2010assisted laser desorption\/ionization Fourier transform mass spectrometric analysis of oxygenated triglycerides and phosphatidylcholines in egg tempera paint dosimeters used for environmental monitoring of museum display conditions"],"prefix":"10.1002","volume":"36","author":[{"given":"Oscar F.","family":"van den Brink","sequence":"first","affiliation":[]},{"given":"Jaap J.","family":"Boon","sequence":"additional","affiliation":[]},{"given":"Peter B.","family":"O'Connor","sequence":"additional","affiliation":[]},{"given":"Marc C.","family":"Duursma","sequence":"additional","affiliation":[]},{"given":"Ron M. 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