pom212-kiwifruits_ak_2005_handout

pom212-kiwifruits_ak_2005_handout - Postharvest Biology and...

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Unformatted text preview: Postharvest Biology and Technology of Kiwifruits Adel Kader UC Davis Physical and Compositional Changes during Development of Kiwifruit Changes Associated with Ripening of Kiwifruits The Climacteric Rise at 20ºC (68ºF)in Respiration and Ethylene Production in Relation to Flesh Firmness of Kiwifruits Effect of Temperature on Ethylene Production by Kiwifruits From Mary Lu Arpaia From Mary Lu Arpaia 1 Changes in Flesh Firmness, Respiration Rate, and Ethylene Production Rate of Kiwifruits Kept at 0ºC (32ºF) for 24 Weeks Temperature Effects on Softening Rate of Kiwifruits From Mary Lu Arpaia Average Rate of Kiwifruit Softening Following Ethylene Treatment at 0-2°C (32-36°F) 0(32- 36° Temperature °C 0 5 13 20 25 °F 32 41 55 68 77 Firmness loss per day Newtons 5.3 6.2 6.7 12.0 13.3 Lb-force Lb1.2 1.4 1.5 2.7 3.0 0 7 Average Rate of Kiwifruit Softening Following Ethylene Treatment at 20°C (68°F) Firmness loss per day Newtons 6.7 8.9 13.3 lb-force lb1.5 2.0 3.0 Number of days to soften from 12 to 3 lbf 7.0 6.0 3.0 Temperature °C °F 32 45 68 20 Starch Disappearance in Kiwifruits during Storage at 0ºC (32ºF) for 12 Weeks From Mary Lu Arpaia 2 3 4 Defects Sunburn symptoms Control Shriveled 5 Control Shriveled Hard Soft Control Impact bruising Freezing damage 1 2 3 4 5 6 Vibration Injury Rating Scale Pericarp translucency 6 Pericarp granulation White core inclusions Postharvest Diseases Botrytis cinerea Ammonia injury Penicillium expansum Fludioxonil (Scholar) Postharvest Fungicides: Fenhexamid (Elevate) Tools for measuring flesh firmness and soluble solids content of kiwifruit Kiwifruit Harvesting 7 Packinghouse Operations 8 9 Conclusion Fresh-cut kiwifruit slices had a shelf-life of 9-12 days if treated with 1% CaCl2, or 2% Ca lactate, and stored at 0-2°C and >90% relative humidity in an C2H4-free atmosphere of 2 to 4 kPa O2 and/or 5 to 10 kPa CO2 10 ...
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This note was uploaded on 12/30/2010 for the course POM 212 taught by Professor Kadermitcham during the Spring '05 term at UC Davis.

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