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Published online by Cambridge University Press: 05 December 2011
Acetaldehyde (AA) vapours exogenously applied or endogenously synthesised caused inhibition of fruit ripening process. Exposure of whole tomatoes to 6000 ppm AA vapour, for 6–24 h prior to storage, caused inhibition of fruit ripening, as expressed by reduced colour development. The endogenous levels of AA and ethanol found in the juice were positively correlated with the durations AA applied. Application of CO2 or N2 atmosphere resulted in production of endogenous AA and ethanol which also led to inhibition of ripening. Polygalacturonase (PG) activity was inhibited by the various AA treatments, as well as by CO2 or N2 pretreatments.
Exposure of mango fruits to AA vapour (1500–3300 ppm) caused a delay in colour development of mango fruits cv. ‘Haden’. The higher the AA concentration applied, the more effective it was in delaying fruit colour development. In addition to delaying ripening, AA concentration of 2200 ppm was the most effective in reducing the amount of fruit infected with Alternaria alternata, which is a latent fungus in this fruit. In mango cv. ‘Tommy Atkins’ pretreatment with N2 atmosphere prior to storage delayed ripening as expressed by less colour development.