Abstract
Volatiles of differently ripened fresh pineapples were investigated by a non-targeted profiling analysis comparing fruits harvested at full maturity exported by rapid air freight to pineapples harvested at an earlier green-ripe stage. The latter fruits were exported by sea freight and analysed upon arrival at their destination and after post-harvest flavour genesis. Volatiles were analysed by headspace solid-phase microextraction, gas chromatography–mass spectrometry and multivariate statistical data analysis. Clear-cut differences in the volatile profiles were found. Fully ripe air-freighted pineapples were characterised by elevated concentrations of two 1,3,5,8-undecatetraene isomers, methyl 3-methylbutanoate and 4-methoxy-2,5-dimethyl-3(2H)-furanone, which have been reported as potent contributors to the pineapple flavour. Compared to fully ripened fruits, development of volatiles of sea-freighted pineapples upon arrival in Europe was rudimentary. Post-harvest storage of sea-freighted pineapples resulted in a different volatile profile due to the genesis of hydroxylated and acetoxylated methyl esters and hexanal. Subsequent descriptive sensory analysis was performed by trained panellists comparing retronasal odour and taste profiles. Fully ripe fruits were characterised by a pineapple-like note, fruity flavours and a sweet taste. In contrast, most of these attributes were rated at lower intensities when premature green-ripe fruits were tested. At the end of the post-harvest period, sea-freighted pineapples were characterised by fruity notes accompanied by a musty/corky- and cardboard-like off-flavour. Odour, taste and overall preference were significantly higher rated for air-freighted pineapples as revealed by an untrained consumer panel.
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Abbreviations
- dah:
-
Days after harvest
- DS:
-
Diastereomers
- FR:
-
Fully ripe air-freighted pineapple
- FW:
-
Fresh weight
- LRI:
-
Linear retention index
- LV:
-
Latent variable
- PLS-DA:
-
Partial least squares discriminant analysis
- GR:
-
Green-ripe sea-freighted pineapple
- TA:
-
Titratable acidity
- TSS:
-
Total soluble solids
- VID:
-
Variable identification (coefficient)
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Acknowledgments
One of the authors (C.B.S.) gratefully acknowledges funding of the present research by the Landesgraduiertenförderung Baden-Württemberg. We thank Frank Oberschilp (Peelco, Accra, Ghana) and Fritz Schumacher (Schumacher, Filderstadt-Bernhausen, Germany) for kindly supplying the pineapple samples and organising the export trials. Furthermore, the authors wish to thank the members of the sensory panels at Fraunhofer-Institute and University of Hohenheim.
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The authors declare no conflict of interest.
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This article does not contain any studies with human or animal subjects.
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Steingass, C.B., Dell, C., Lieb, V. et al. Assignment of distinctive volatiles, descriptive sensory analysis and consumer preference of differently ripened and post-harvest handled pineapple (Ananas comosus [L.] Merr.) fruits. Eur Food Res Technol 242, 33–43 (2016). https://doi.org/10.1007/s00217-015-2515-x
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DOI: https://doi.org/10.1007/s00217-015-2515-x