Shelf-life of ‘Golden Reinders’ Apples after Ultra Low Oxygen Storage: Effect on Aroma Volatile Compounds,Standard Quality Parameters,Sensory Attributes and Acceptability

Abstract

The aim of this work was to estimate shelf-life potential and understand quality characteristics of ‘Golden Reinders’ apples during ripening after storage under ultra low oxygen (ULO) atmosphere. Fruits, corresponding to two different maturity stages (147 and 155 dafb), were kept at 1 °C in ULO atmosphere (1 kPa O₂: 1 kPa CO₂) for seven months and subsequently kept at 1 °C in regular air for up to 28 days. Sub-batches were removed weekly and transferred to 20 °C, so that the shelf-life periods at room temperature were 28, 21, 14, 7, and 0 days. Fruit from both maturity stages showed firmness and soluble solids content (SSC) values above the minimum commercial requirements for this variety throughout the post-storage ripening period. However, only earlier harvested fruit maintained high levels of titratable acidity (TA). Production of aroma volatile compounds was low for shorter ripening periods, though it increased progressively as ripeness advanced. Principal component analysis showed the variables that positively influenced acceptability were: octyl acetate, hexyl octanoate, butyl propanoate, propyl pentanoate, and 6-methyl-5-hepten-2-one as aroma volatile compounds; SSC, TA, firmness, and epidermis colour (Hue) as physicochemical parameters; and sourness and sensory firmness as sensory attributes. From a general overview, the optimum shelf-life period for ‘Golden Reinders’ apples would be between 7 and 14 days for both maturity stages.

Keywords

aroma volatile compounds consumer acceptability Malus domestica Borkh.shelf-life ultra low oxygen atmosphere

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