1986 Fiscal Year Final Research Report Summary
Some considerations on precooling of fruit and vegetable in transit at ambient temperature.
| Project/Area Number |
60480040
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
園芸・造園学
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| Research Institution | Okayama University |
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Principal Investigator |
NAKAMURA Reinosuke College of Agriculture, 農学部, 教授 (70021053)
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| Co-Investigator(Kenkyū-buntansha) |
KUBO Yasutaka College of Agriculture, 農学部, 助手 (80167387)
INABA Akitsugu College of Agriculture, 農学部, 教授 (90046491)
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| Project Period (FY) |
1985 – 1986
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| Keywords | Transit of fruits and vegetables / Precolling / 呼吸生理 |
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| Research Abstract |
Changes in temperature of precooled spinach transported by truck at ambient temperature under foun different conditions were observed in 1985 and 1986. Additional examinations for determining changes in respiration rate of several fruits and vegetables affected by rapid elevation of temperature were carried out under simulated conditions, using an apparatus automated by microcomputer.
1) Temperature of spinach packed in carton box, precooled at 5゜C or at 15゜C and transported under uninsulated condition elevated rapidly during transportation, and attained to ambient temperature at next morning. Rapid elevation of temperature in case of spinach packed in foam-plastic box was also observed. On the other hand, temperature of spinach transported under insulated condition covered by foam-rubber sheet maintained at low level below 10゜C. Changes in freshness of spinach at ambient temperature after transportation were not affected by precooling temperature.
2) Carbon dioxide output and oxygen uptake of several fruits and vegetables increased rapidly to peak value with rapid elevation of temperature from 5゜C to 35゜C, and then decreased gradually to constant level at 35゜C. This excess acceleration of respiration rate was observed significantly at higher rate of temperature elevation. Little excess acceleration was observed in case of 10゜C elevation of temperature.
3) From the results obtained above, it is considered that fruits and vegetables in transit at ambient temperature may not be necessary to precooled at extreme degree of low temperature such as 5゜C. In addition,elevation of temperature during transportation kept within 10゜C may be favorable for keeping quality of fruits and vegetables, judging from the standpoint of their physiological response.
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