Abstract
Qualitative ripening-dependent changes of pineapple volatiles were studied via headspace solid-phase microextraction and analyzed by comprehensive two-dimensional gas chromatography quadrupole mass spectrometry (HS-SPME-GC×GC-qMS). Early green-ripe stage, post-harvest ripened, and green-ripe fruits at the end of their commercial shelf-life were compared to air-freighted pineapples harvested at full maturity. In total, more than 290 volatiles could be identified by mass spectrometry and their linear retention indices. The majority of compounds comprise esters (methyl and ethyl esters of saturated and unsaturated fatty acids, acetates), terpenes, alcohols, aldehydes, 2-ketones, free fatty acids, and miscellaneous γ- and δ-lactones. The structured separation space obtained by GC×GC allowed revealing various homologous series of compound classes as well as clustering of sesquiterpenes. Post-harvest ripening increased the diversity of the volatile profile compared to both early green-ripe maturity stages and on-plant ripened fruits.
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Acknowledgments
The authors would like to thank Mr. Frank Oberschilp (Peelco Ltd., Accra, Ghana) and Mr. Fritz Schumacher (Schumacher GmbH, Filderstadt-Bernhausen, Germany) for supplying the fruits. One of the authors (C.B.S.) is grateful for funding of the present research by the Landesgraduiertenförderung Baden-Württemberg. Financial support from the Ministerium für Umwelt, Landwirtschaft, Ernährung, Weinbau und Forsten (MULEWF, Rheinland-Pfalz, Germany) is gratefully acknowledged.
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Steingass, C.B., Carle, R. & Schmarr, HG. Ripening-dependent metabolic changes in the volatiles of pineapple (Ananas comosus (L.) Merr.) fruit: I. Characterization of pineapple aroma compounds by comprehensive two-dimensional gas chromatography-mass spectrometry. Anal Bioanal Chem 407, 2591–2608 (2015). https://doi.org/10.1007/s00216-015-8474-z
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DOI: https://doi.org/10.1007/s00216-015-8474-z