Quantitative Analyse Of Volatile Compounds In Muskmelons (cv. Yindi) And Effect Of BTH Or Harpin Treatment On Flavor Volatiles

Muskmelon is one of the important crops with the good economical benefit in Gansu province. However, decay easily occurred during postharvest. Application of BTH or Harpin could effectively induce resistant disease and decrease the rot of fruit. The objectives of this study were to firstly analyse the volatile compounds of muskmelons (cv. Yindi) with SPME and GC-MS, and find their release pattern and character impact compounds(CIC)during storage at ambient temperature; secondly investigate whether elicitor treatment effect on the release of volatile compounds of the melons treated with 100mg/L of BTH or 50mg/L of Harpin at the harvest day, 1 day or 1 week before harvest. The results showed as below: 1. The esters were obviously increased as the storage time prolonged, especially for acetate, both kinds and amount increased. On the contrary, the release of aldehyde was reduced, such as (E,Z)-2,6-Nonadienal decreased obviously gradually. 2. The character impact compounds of the muskmelons (cv.Yindi) were identified as ethyl acetate, butyl acetate, isobutyl acetate, 2-methylbutyl acetate, hexyl acetate, methyl acetate, phenylmethyl acetate, ethyl butyrate, methyl (methylthio) acetate, trans-6-Nonenal, (E,Z)-2,6-Nonadienal, cis-4-Nonenal, and ethanol. Esters were in the majority, the amount of them accounted for 64.98% of the total volatile compounds. 3. BTH or Harpin suppressed significantly the release of volatile compounds of fruit during the storage at ambient temperature. After 12 days of storage, the total volatile compounds of fruit treated with BTH at the harvest day, 1 day and 1 week before harvest were accounted for 74.5%,77.9% and 77.7% of the control. Similarly, as for Harpin treatments accounted for 76.4%,80.1% and 79.3%, respectively. 4. BTH decreased significantly the amount of some character impact compounds, such as ethyl acetate, butyl acetate, isobutyl acetate and 2-methylbutyl acetate. Especially for methyl (methylthio) acetate, not only reduced its amount, but also delayed its release peak. Treatments at 1 day or 1 week before harvest delayed the release peak of methyl acetate, and reduced the amount of trans-6-nonenal, (E,Z)-2,6-nonadienal and cis-4-nonenal. 5. Harpin suppressed the amount of ethyl acetate, butyl acetate, ethyl butyrate, 2-methylbutyl acetate, methyl (methylthio) acetate and (E,Z)-2,6-Nonadienal. Treatment at 1 day or 1 week before harvest decreased effectively the amount of phenylmethyl acetate, delayed the release peak of methyl acetate, hexyl acetate and methyl (methylthio) acetate.