HOT WATER IMMERSION TREATMENT For Mangoes
HOT WATER IMMERSION TREATMENT
• Improving the current hot water treatment process is key to maximizing mango
quality. Hot water treatment remains effective, but shippers need to be proactive
in following the proper cooling techniques after hot water immersion. Poor
cooling after hot water treatment is one of the primary reasons for poor mango quality.
Researchers found that the hot water process could be improved by implementing the
following steps:
o Hydro-cool fruit immediately after hot water immersion, or after the 30 minute
delay following treatment.
o Set the hydro-cooler water bath temperature at 70-72˚F (21-22˚C).
o Hydro-cool mangos long enough that the internal temperature reaches 80-85˚F
(27-29˚C), generally about 30 minutes depending on the size of the fruit. Fruit
that is not properly cooled will show increased signs of heat injury and will ripen
more quickly.
o Pack fruit immediately after cooling to minimize damage. Shippers that choose
to hold the fruit for 12 hours after hot water immersion to check for heat injury
should provide ventilation, such as overhead paddle fans, around the mangos and allow at least 8 inches of space between the stacks of bins, researchers
say.
o Use forced-air cooling between the range of 48-50˚F (9-10˚C) to cool the
mangos again after the fruit is packed and before they’re placed in cold storage
or a cold container. If fruit cannot be loaded for transport immediately, it should
be placed in a cold room with temperatures from 50-60˚F (10-15˚C).
o Ensure that transport containers are cooled before loading to a temperature no
higher than 54˚F (12˚C).
o Be sure that hydro-cooler water is properly sanitized with chlorine or other
chemicals. Cool water can be pulled inside the warm fruit during hydro-cooling
and potential pathogens in the water can contaminate the mangos.
• Hot water immersion is not effective against the mango seed weevil. At this time,
most Central and South American countries are not hosts to the mango seed weevil, so
this is not cause for immediate concern. If the U.S. considers importing mangos from
other regions, like India for example, irradiation treatment at a higher dose – about 300
grays – could kill the mango seed weevil.
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