Application of intermittent warming to enhance postharvest quality and extend the shelf life of pomegranate fruit (Punica granatum)

Abstract

Intermittent warming (IW) cycles slow down the physiology of fresh horticultural commodities, thereby extending their storage life. We investigated the effects of IW on physiological disorders, physicochemical, sensory parameters and the emission of volatile organic compounds (VOCs) of pomegranate (Punica granatum; cv. Wonderful) fruit during a 3-month cold storage period. Pomegranate fruit batches were subjected to IW cycles of 3d at 5°C, followed by 1 d at 20°C (IW 3d) and 6 d at 5°C, followed by 1 d at 20°C (IW 6d). During cold storage at 5°C, fruit samples were transferred to shelf-life conditions at 20°C for 4 d before analysis was performed monthly. Continuous fruit mass loss was observed across all treatments during storage but was highest (p < 0.05) for untreated samples at the end of this study. Fruit decay was minimized by 15% and 16% for IW 3d and IW 6d, respectively, compared to 42% for the control. In contrast, a higher incidence of chilling injury was observed in the treated fruits than in control. Therefore, IW 3 d at 5°C is recommended for decay reduction in pomegranate fruit (cv. Wonderful) and shelf-life extension for up to 3 months of storage.

Keywords:

• postharvest technologies
• storage life
• fresh fruit
• heat treatment
• fungi

Acknowledgements

This work is based on the research mainly supported by the National Research Foundation (NRF) of South Africa (Grant number 64813). The opinions, findings, and conclusions or recommendations expressed are those of the author(s) alone, and the NRF accepts no liability whatsoever in this regard.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This research was funded by National Research Foundation of South Africa [Grant number: 64813].