Abstract
In this study, the effects of three cold storage technologies, (i) controlled atmosphere-CA (CO2 4%, O2 3%), (ii) ultra low oxygen-ULO and (iii) dynamic controlled atmosphere-DCA, were investigated on fruit quality of ‘Scarlet Spur’ apples stored during 10 months plus 7 days of shelf life at 20 °C. After harvest, apples were stored at 0 °C and 90±5% relative humidity during 10 months in CA, ULO (CO2 3%, O2 1%,) and DCA (CO2 1%, O2 0.5%) conditions. HarvestWatch™ sensors were used for assessment of lower oxygen limit (LOL) of fruit during DCA storage. DCA was the best storage condition suppressing ethylene synthesis and respiration rate during storage. The ULO and DCA conditions showed similar results in the maintenance of firmness and TA amount. Weight loss in these conditions was also lower than CA. No significant difference was observed between storage conditions in terms of SSC. DCA technology gave better results in maintaining color of ‘Scarlet Spur’ than other conditions during cold storage. Result showed that; ULO and DCA conditions were more effective in maintaining quality compared to CA in terms of all quality parameters.
Highlights
DCA was the best storage condition suppressing ethylene synthesis and respiration rate during storage
The highest respiration rate during storage was determined in samples in Controlled atmosphere (CA) while the lowest respiration rate was observed in DCA
Respiration rate values obtained from samples stored in ultra low oxygen (ULO) (11.86 mL.CO2 kg-1h-1) and DCA (11.39 mL.CO2 kg-1h-1) gave similar results
Summary
Controlled atmosphere (CA) storage is a widely used technology for the storage of apple which is one of the most produced and consumed fruit in the world. Researches in some apple varieties showed that DCA is more effective than CA for maintaining quality during storage (Veltman et al 2003; Gasser et al 2005; Delong et al 2007; Bessemans et al 2016; Thewes et al 2017). CF technique measures the stress occurring in fruit during storage period In this method, while the O2 level is reduced, the CF signal on the fruit surface is measured by the sensor (Vanoli et al 2010). In researches on effect of CA, ULO and DCA storage conditions for maintaining significant quality criteria in apples, results has changed based on cultivars (Aubert et al 2015; Both et al 2017; Kittemann et al 2015; Thewes et al 2015; Tran et al 2015; Brizzolara et al 2017). In this study, the effects of CA, ULO and DCA on fruit quality of ‘Scarlet Spur’ apple cultivar was evaluated during a storage period of 10 months plus a shelf life period of 7 days at 20°C
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