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Unformatted text preview: 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 2 Hydrometer for Measuring Soluble Solids Content of Orange Juice Relationship Between Sugar/Acid Ratio And Panelists Response To The Question About Willingness To Buy Navel Oranges Relationship Between Sugar/Acid Ratio And Panelists Response To The Question About Willingness To Buy Navel Oranges 37 37 63 63 13 13 12/12 12/12-16 16 47 47 53 53 27 27 11/28 11/28-12/2 12/2 58 58 42 42 39 39...
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- Spring '05