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Impact of storage conditions on the apple allergen Mal d 1

Einfluss von Lagerungsbedingungen auf das Apfelallergen Mal d 1

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Abstract

Consumption of fresh apple fruits can induce allergic reactions in humans. The apple allergen Mal d 1 is responsible for these allergic reactions in humans in Central Europe and North America. Biosynthesis of Mal d 1 depends on apple cultivar, and its concentration increases with time during fruit storage. However, data on the impact of different fruit storage conditions during long-term storage are scarce. Hence, the Mal d 1 contents of eight apple cultivars were analyzed for this study during long-term storage in a cold chamber as well as under controlled atmosphere conditions (CA).

After harvest, apple fruits were stored for 12, 20, 28 or 36 weeks in a cold-chamber at + 2 °C or as under controlled atmosphere conditions of 1.5 % CO2, 1.5 % O2 at + 2 °C. Mal d 1 content in apple fruit of all eight cultivars examined increased during fruit storage. In most cases, differences between Mal d 1 of apple fruits stored in the cold chamber and under CA conditions were significant, but inconsistent. In apple cv. ‘Elise’, fruits stored in the cold chamber contained more Mal d 1 compared with those stored in CA, whereas the situation reversed in other varieties like cv. ‘Boskoop’. The greatest Mal d 1 content was measured in fruits of cvs. ‘Golden Delicious’ and ‘Gala’, whereas the smallest Mal d 1 level was in cvs. ‘Elise’ and ‘Pinova’ over the whole storage time. Overall, this experiment showed the complexity of the relationship between the Mal d 1 content, allergenicity of apple fruits, different cultivars, storage conditions and storage time. Persons allergic to apple fruits should consume the fruits as fresh as possible or only after a limited storage time. Furthermore, they should prefer apple varieties with a low content of allergenic proteins, such as cv. ‘Elise’ or cv. ‘Boskoop’ as a cultivar known for its large polyphenol content.

Zusammenfassung

Der Konsum frischer Äpfel kann zu allergischen Reaktionen führen. Verantwortlich für diese Reaktionen ist bei Menschen in Zentraleuropa sowie in Nordamerika das Apfelallergen Mal d 1. Die Synthese von Mal d 1 ist sortenabhängig und die Konzentration dieses allergenen Proteins steigt während der Lagerung an. Es gibt jedoch nur wenige Informationen über den Einfluss verschiedener Lagerbedingungen während der Langzeitlagerung auf den Mal d 1-Gehalt. Daher wurde für diese Studie der Mal d 1 Gehalt acht unterschiedlicher Apfelsorten während der Kühllagerung bei + 2 °C sowie unter kontrollierter Atmosphäre analysiert.

Nach der Ernte wurden die Früchte für 12, 20, 28 und 36 Wochen im Kühllager bei + 2 °C sowie unter kontrollierter Atmosphäre (1.5 % CO2, 1.5 % O2) bei + 2 °C gelagert. Bei allen Apfelsorten stieg der Mal d 1 Gehalt während der Lagerung an. Zudem unterschieden sich in den meisten Fällen die Mal d 1 Gehalte in Abhängigkeit von der Lagerart. Jedoch waren die Ergebnisse nicht einheitlich. Für die Apfelsorte ‘Elise’ wurden höhere Mal d 1 Gehalte bei kühlgelagerten Früchten im Vergleich zu CA-gelagerten Früchten ermittelt. Das Ergebnis für Früchte der Sorte ‘Boskoop’ hingegen war genau umgekehrt. Der höchste Mal d 1 Gehalt wurde in Früchten der Sorten ‘Golden Delicious’ und ‘Gala’ ermittelt, während der geringste Mal d 1 Gehalt über den gesamten Lagerzeitraum für die Sorten ‘Pinova’ und ‘Elise’ gemessen wurde. Diese vorliegende Studie verdeutlicht die Komplexität der Zusammenhänge von Mal d 1-Gehalt, allergenem Potential der Früchte, unterschiedlicher Sorten, Lagerungsbedingungen sowie der Lagerdauer. Apfelallergiker sollten die Früchte so frisch wie möglich konsumieren oder nur nach einer kurzen Lagerperiode. Zudem sollten sie Apfelsorten bevorzugen, die einen geringen Allergengehalt haben, wie beispielsweise die Sorte ‘Elise’ oder ‘Boskoop’ und/oder solche mit hohem Polyphenolgehalt sowie hoher PPO (Polyphenoloxidase)-Aktivität.

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Acknowledgements

We thank Dr. Trierweiler of Max Rubner Institute Karlsruhe for storing the apple fruits under CA conditions and Dr. Michael Blanke for his helpful suggestions.

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Correspondence to Michaela Schmitz-Eiberger.

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Kiewning, D., Baab, G. & Schmitz-Eiberger, M. Impact of storage conditions on the apple allergen Mal d 1. Erwerbs-Obstbau 54, 177–183 (2012). https://doi.org/10.1007/s10341-012-0175-6

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  • DOI: https://doi.org/10.1007/s10341-012-0175-6

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