Journal
POSTHARVEST BIOLOGY AND TECHNOLOGY
Volume 164, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.postharvbio.2020.111170
Keywords
Apple peel wax; Chlorophyll fluorescence; Fruit; 'Pink Lady'; Postharvest; Respiratory quotient
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Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [311125/2018-2, 428691/2016-1]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior -Brasil (CAPES) [001, 11/2014]
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The effects of controlled atmosphere (CA) and dynamic controlled atmosphere based on chlorophyll fluorescence (DCA-CF) and respiratory quotient (DCA-RQ; RQ = 1.3 and 1.5) on the metabolism, decay incidence, concentration and chemical composition of 'Cripps Pink' apple peel wax after 8 months of storage plus shelf life at 20 degrees C were studied. DCA-RQ1.3 stored fruit had the lowest respiration rate, evidencing low metabolism, corroborating with the highest number of healthy fruit and consequently being the best storage condition. The mean wax concentration found 21.23 g m(-2), although it was lower for the DCA-RQ1.5 condition after 7 d. There was increase in wax concentration for DCA treatments from 7 to 14 d of shelf life. Chromatographic analysis allowed the identification of palmitic, stearic, oleic and linoleic fatty acids, with an increase in cis-11,14-eicosadienoic acid in all treatments and in palmitic acid in CA at 14 d. Triterpenoids, such as ursolic acid and oleanolic acids, were higher in CA, while alcohols such as 10-nonacosanol was higher in both DCA-RQ treatments. All treatments had high concentrations of nonacosane and tetracosanal. DCA-RQ decrease the incidence of greasiness. The supposed induction of anaerobic metabolism by extremely low oxygen levels and consequently higher concentration of ethanol, which were monitored by the two levels of RQ, induced the formation of compounds that may favor some mechanisms of adaptation against the low oxygen partial pressure (pO(2)).
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