Difference between revisions of "Mandarins"

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(Created page with "{{Infobox_Fruit | image = mandarins.jpg | carrying temperature = 4°C/8°C (Mandarins)<br> 4°C/5°C (Clementines, Minneolas) | high...")
 
 
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{{Infobox_Fruit
 
{{Infobox_Fruit
 
| image                              = mandarins.jpg
 
| image                              = mandarins.jpg
| carrying temperature                = 4°C/8°C (Mandarins)<br> 4°C/5°C (Clementines, Minneolas)
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| carrying temperature                = 4°C/8°C (Mandarins)<br> 4°C/6°C (Clementines, Tangelo / Minneolas)
  
 
| highest freezing point              = -1,1°C
 
| highest freezing point              = -1,1°C
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==Harvesting and handling==
 
==Harvesting and handling==
 
Soft citrus, easy peelers or mandarins are common names for a new series of citrus cultivars. [[Fruit]] of these cultivars are normally softer than the known citrus fruit and have a loose skin that can easily be removed giving rise to these names.
 
Soft citrus, easy peelers or mandarins are common names for a new series of citrus cultivars. [[Fruit]] of these cultivars are normally softer than the known citrus fruit and have a loose skin that can easily be removed giving rise to these names.
 
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<br><br>
Some of the commercial cultivars that are exported are Clementines, Clemenules, Ellendales, Minneolas, Satsumas and Tangerines. Fruit of these cultivars are very delicate in texture and flavour and are more temperature sensitive than the traditional oranges. Cooling as soon as possible after harvest and maintenance of the cold chain throughout is very important to maintain quality. Different fungicides are recommended as post harvest treatments.  
+
Some of the commercial cultivars that are exported are [[Clementines]], [[Clemenules]], [[Ellendales]], [[Minneolas]], [[Satsumas]] and [[Tangerines]]. [[Fruit]] of these cultivars are very delicate in texture and flavour and are more temperature sensitive than the traditional [[oranges]]. Cooling as soon as possible after harvest and maintenance of the cold chain throughout is very important to maintain quality. Different fungicides are recommended as post harvest treatments.  
 
+
<br><br>
Degreening with ethylene (to remove the chlorophyll from the peel) may be necessary for some citrus fruit. However, this can increase susceptibility to decay.  
+
Degreening with ethylene (to remove the chlorophyll from the peel) may be necessary for some citrus fruit. However, this can increase susceptibility to decay. The degree of ripeness of citrus fruit is determined by the Brix value, which is a measure of the sugar/acid ratio of the fruit; Brix values of 12-16% are acceptable for good flavour quality. High quality mandarins will have a turgid, deep orange-red peel relatively free of blemishes. The fruit should be elliptical and firm. The peel should be easily removed from the flesh. The edible portion should be juicy and contain few or no [[seeds]].
 
 
The degree of ripeness of citrus fruit is determined by the Brix value, which is a measure of the sugar/acid ratio of the fruit. Citrus fruit with a Brix value between 10 and 16 degrees have a good flavour.  
 
 
 
High quality mandarins will have a turgid, deep orange-red peel relatively free of blemishes. The fruit should be elliptical and firm. The peel should be easily removed from the flesh. The edible portion should be juicy and contain few or no seeds.
 
 
 
 
==Cooling and storage==
 
==Cooling and storage==
'Easy peelers' require adequate pre-cooling and continuous refrigeration at 4°C to 8°C and 90% relative humidity, under which conditions the fruit should keep for approx. 1-2 months. Storage duration depends on variety, maturity at harvest and decay control. Due to the high water content of this citrus fruit, a relative humidity of 90% is required. Inadequate ventilation may result in fermentation and rotting of the cargo as a result of CO<SUB>2</SUB> levels and inadequate supply of atmospheric oxygen.
+
'Easy peelers' require adequate pre-cooling and continuous refrigeration at 4°C to 8°C and 90% relative humidity, under which conditions the fruit should keep for approx. 1-2 months. Storage duration depends on variety, maturity at harvest and decay control. Due to the high water content of this citrus fruit, a relative humidity of 90% is required. Inadequate ventilation may result in fermentation and rotting of the cargo as a result of CO<SUB>2</SUB> levels and inadequate supply of atmospheric oxygen.<br><br>
 
+
Swift warming of refrigerated citrus fruit may initiate resp. enhance condensation and spoilage. Citrus fruit in storage should be examined often for pitting or decay. After such examinations, any decision on how long the fruit can safely be left in storage should be based on the fact that if pitting and decay are present, they will increase rapidly after the fruit are removed to higher temperatures.<br><br>
Depending upon the species and variety, all citrus fruits are highly cold-sensitive. [[Grapefruit]], [[lemons]] and [[limes]] are more susceptible to chilling damage than are oranges and mandarins, and late-ripening varieties are more temperature-sensitive than early varieties.
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Mandarins have thin peels that are readily injured under conditions that promote high peel water content. Severity of chilling injury increases with temperatures below 5 °C and longer durations. Mandarins are susceptible to granulation, or section-drying. Susceptibility is influenced by variety and over-maturation.<br><br>
 
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Cold treatment involves storage of fruit below 2.2 ºC for specified periods to ensure their freedom from fly infestation. However, because of susceptibility to chilling injury, fruit may be stored at higher temperatures of 10 to 15 °C for about 1 week prior to cold treatment to increase resistance to chilling injury.<br><br>
Chilling injury can occur in storage if temperatures fall <4°C/5°C. Chilling damage is manifested in citrus fruits in particular by spots on the peel (brown dots on the peel), accompanied by a bitter taste and unpleasant odour, rot and cell wall collapse. The glossiness of the peel is lost and the albedo layer (inner layer of the peel), which is normally white, turns a dark colour. When the [[fruit]] is divided up, the segments, which have a low juice content, break up and the whole fruit is glassy and soft. The severity of the chilling damage is determined not only by the extent to which the temperature has fallen beneath the limit, but also by the length of exposure to this temperature.
 
 
 
Excessively rapid warming of refrigerated fruit results in condensation and spoilage. Citrus fruit in storage should be examined often for pitting or decay. After such examinations, any decision on how long the fruit can safely be left in storage should be based on the fact that if pitting and decay are present, they will increase rapidly after the fruit are removed to higher temperatures.  
 
 
 
 
 
==Mixed loads==
 
==Mixed loads==
 
Citrus fruit should not be shipped with [[apples]] and not with ethylene emitting products (which might promote decay).
 
Citrus fruit should not be shipped with [[apples]] and not with ethylene emitting products (which might promote decay).
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Aging, Alternaria rot, Anthracnose, Aspergillus rot, Black mould rot, Black pit, Black spot, Blue mould, Brown rot, Canker, Chilling injury, Cottony rot, Degreening failure, Fusarium, Green mould rot, Grey mould rot, Insect damage, Melanose, Rind discoloration, Scab, Scald, Senescent breakdown, Sooty Blotch, Sooty Mould, Stem end rot.
 
Aging, Alternaria rot, Anthracnose, Aspergillus rot, Black mould rot, Black pit, Black spot, Blue mould, Brown rot, Canker, Chilling injury, Cottony rot, Degreening failure, Fusarium, Green mould rot, Grey mould rot, Insect damage, Melanose, Rind discoloration, Scab, Scald, Senescent breakdown, Sooty Blotch, Sooty Mould, Stem end rot.
  
 
[[Category:Fruit]]
 
 
[[Category:Perishables]]
 
[[Category:Perishables]]
 
[[Category:Products]]
 
[[Category:Products]]

Latest revision as of 16:30, 1 November 2017

Infobox on Mandarins
Example of Mandarins
Mandarins.jpg
Freshness facts
Optimum carrying temperature 4°C/8°C (Mandarins)
4°C/6°C (Clementines, Tangelo / Minneolas)
Highest freezing point -1,1°C
Acceptable product temp. at loading into containers Max. 5°C above carrying temperature
Optimum humidity 90%
Ventilation setting for containers 25 m³/hr
Storage life 1 to 2 months
Climacteric / non-climacteric Non-climacteric
Ethylene production Very Low
Ethylene sensitivity Moderate
Modified / controlled atmosphere 0%-5% CO2; 5%-10% O2
Potential benefits Slight
Availability
Australia/New Zealand
South Africa
South America

June - August
April - June

Mandarins

Harvesting and handling

Soft citrus, easy peelers or mandarins are common names for a new series of citrus cultivars. Fruit of these cultivars are normally softer than the known citrus fruit and have a loose skin that can easily be removed giving rise to these names.

Some of the commercial cultivars that are exported are Clementines, Clemenules, Ellendales, Minneolas, Satsumas and Tangerines. Fruit of these cultivars are very delicate in texture and flavour and are more temperature sensitive than the traditional oranges. Cooling as soon as possible after harvest and maintenance of the cold chain throughout is very important to maintain quality. Different fungicides are recommended as post harvest treatments.

Degreening with ethylene (to remove the chlorophyll from the peel) may be necessary for some citrus fruit. However, this can increase susceptibility to decay. The degree of ripeness of citrus fruit is determined by the Brix value, which is a measure of the sugar/acid ratio of the fruit; Brix values of 12-16% are acceptable for good flavour quality. High quality mandarins will have a turgid, deep orange-red peel relatively free of blemishes. The fruit should be elliptical and firm. The peel should be easily removed from the flesh. The edible portion should be juicy and contain few or no seeds.

Cooling and storage

'Easy peelers' require adequate pre-cooling and continuous refrigeration at 4°C to 8°C and 90% relative humidity, under which conditions the fruit should keep for approx. 1-2 months. Storage duration depends on variety, maturity at harvest and decay control. Due to the high water content of this citrus fruit, a relative humidity of 90% is required. Inadequate ventilation may result in fermentation and rotting of the cargo as a result of CO2 levels and inadequate supply of atmospheric oxygen.

Swift warming of refrigerated citrus fruit may initiate resp. enhance condensation and spoilage. Citrus fruit in storage should be examined often for pitting or decay. After such examinations, any decision on how long the fruit can safely be left in storage should be based on the fact that if pitting and decay are present, they will increase rapidly after the fruit are removed to higher temperatures.

Mandarins have thin peels that are readily injured under conditions that promote high peel water content. Severity of chilling injury increases with temperatures below 5 °C and longer durations. Mandarins are susceptible to granulation, or section-drying. Susceptibility is influenced by variety and over-maturation.

Cold treatment involves storage of fruit below 2.2 ºC for specified periods to ensure their freedom from fly infestation. However, because of susceptibility to chilling injury, fruit may be stored at higher temperatures of 10 to 15 °C for about 1 week prior to cold treatment to increase resistance to chilling injury.

Mixed loads

Citrus fruit should not be shipped with apples and not with ethylene emitting products (which might promote decay).

Cautions

O2 below 5% can cause off-flavours. CO2 greater than 5% can cause off-flavours. CA has not generally been found to benefit citrus fruit.

Storage disorders

Aging, Alternaria rot, Anthracnose, Aspergillus rot, Black mould rot, Black pit, Black spot, Blue mould, Brown rot, Canker, Chilling injury, Cottony rot, Degreening failure, Fusarium, Green mould rot, Grey mould rot, Insect damage, Melanose, Rind discoloration, Scab, Scald, Senescent breakdown, Sooty Blotch, Sooty Mould, Stem end rot.