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pom212-citrus_2005_handout

pom212-citrus_2005_handout - Postharvest Biology and...

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1 Postharvest Biology and Technology of Citrus Fruits Postharvest Biology and Technology of Citrus Fruits Adel Kader UC Davis Thanks to Professor Irving Eaks, UCRiverside for providing some of the figures used in this presentation. Citrus fruits have less internal air space (intercellular spaces) than most other fruits, which results in a higher gradients between internal and external gas concentrations . California Minimum Maturity Indices for Citrus Fruits SS/A ratio of 6.5 and yellow, orange, or red color on 75% of the fruit surface Tangerine SS/A ratio of 8.0 (and orange color on 25% of the fruit surface) or 10.0 (and less intense orange color) Orange 30% juice by volume Lemon SS/A ratio of 5.5 or 6.0 (desert areas), 2/3 of fruit surface showing yellow color Grapefruit Minimum maturity indices Fruit SS= soluble solids, A=acidity Color Guides for Citrus Fruits Minimum Yellow to Orange Color as a Maturity Index for Oranges Provided that the Soluble Solids/Acid Ratio is 8 or higher
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