title: Effects of 1-methylcyclopropene and hot water quarantine treatment on quality of "Keitt" mangos.
abstract: The optimal 1-methylcyclopropene (1-MCP) treatment to slow ripening of whole "Keitt" mangos, either alone or in combination with hot water treatment (HWT) (prior to or post 1-MCP) was identified. USDA-APHIS mandates that HWT can be used for control of fruit flies, but this may affect fruit response to 1-MCP. Mangos were evaluated by repeated measurement of nondestructive firmness, peel color, and ethylene production on the same mango fruits during 2 wk of ripening at 20 °C after treatment. The magnitude of ethylene production increased as a result of both 1-MCP and HWT. With softer mangos (65 N), treatment with 1-MCP alone delayed fruit softening and extended the number of days to full-ripeness (25 N) from 5 d in untreated fruit to 11 d. For these riper fruit, application of 1-MCP prior to HWT extended the days to full-ripeness to 9 d compared with 7 d when 1-MCP was applied after HWT. With firmer mangos (80 N), 1-MCP treatments alone prolonged the days to full-ripeness to 13 d as compared to 11 d for the untreated fruit. There was no significant concentration effect on firmness retention among 1-MCP treatments (0.5, 1.0, or 10.0 μL/L). HWT resulted in a faster rate of fruit softening, taking only 7 d to reach full-ripeness. Combining 1-MCP with HWT reduced the rate of softening compared to HWT alone, resulting in 9 to 11 d to full-ripeness. Application of 1-MCP before HWT showed a greater ability to reduce the rate of fruit softening compared with 1-MCP treatment after HWT.
authors.affiliation: Dept. of Food Technology, Chulalongkorn Univ., Bangkok, Thailand; Dept. of Food Science and Technology, Univ. of California, Davis, CA, U.S.A.
authors.forename: Panita
authors.initials: P
authors.lastname: Ngamchuachit
authors.forename: Diane M
authors.initials: DM
authors.lastname: Barrett
authors.forename: Elizabeth J
authors.initials: EJ
authors.lastname: Mitcham
mesh_terms: D003116:Color; D003521:Cyclopropanes; D005030:Ethylenes / Q000378:metabolism*; D005511:Food Handling / Q000379:methods*; D005638:Fruit / Q000378:metabolism / Q000592:standards*; D006244:Hardness; D006358:Hot Temperature; D006801:Humans; D031022:Mangifera; D011790:Quarantine; D014867:Water
chemical_list: D003521:Cyclopropanes; D005030:Ethylenes; D014867:Water; C036216:ethylene; C412563:1-methylcyclopropene
keywords: 1-MCP; Mangifera indica L; mango; phytosanitary; quarantine