Ethanol,oxygen and carbon dioxide concentrations
Ethanol content in the MAP of fresh-cut mango was similar for all conditions at the starting day. Higher-temperature storage induced higher ethanol content in the package (Fig.3).resulting in off-flavour at the end of shelf life. There is no threshold level of ethanol content in fresh-cut mangoes by panellists. Thus, the ethanol content of fresh-cut mango was measured at the end of shelf life according to the sensory evaluation by panellists in this study. Coating did not show any significant effect at 5 C . However,coating showe greater ethanol content than uncoated at 30 C . This might be because of the good oxygen barrier of mango film(Sothornvit & Rodsamran,2008) affecting the greater off-flavour as detected in sensory evaluation.In contrast,the commercial edible coating prevented ethanol production in all three cultivars at 5 C storage.The different result might be because of the behaviour of mango cultivars on the effect of different edible coatings.Nevertheless,the combination of MAP and coating is still advantageous at cold storage in maintaining the quality of fresh-cut mango. Moreover,there was a dcrease in oxygen concentration and an increase in carbon dioxide concentration and an increase in carbon dioxide concentration during the storage time in the MAP (Fig.4).As known,lo oxygen and high carbon dioxide concentrations slow down respiration and retard ethylene production and therefore ripening. During storage of mangoes,low levels of oxygen resulted in abnormal colour development and increased ethanol production.Nonetheless,the oxygen level of fresh-cut mangoes in MAP maintaned in higher degree than those without MAP.In this study, no significant difference of gas concentration was oberved between coated and uncoated fresh-cut mango samples in MAP