行政院農業委員會台南區農業改良場  研究彙報第26號

甜玉米保鮮之研究-預冷條件之探討建立與應用

鄭榮瑞 詹碧連 盧子淵 曾清田

摘  要

鄭榮瑞、詹碧連、盧子淵、曾清田.1991.甜玉米保鮮之研究-預冷條件之探討建立與應用。台南區農業改良場研究彙報26:32~44。

甜玉米採收後為確保其品質,應迅速加以預冷處理。預冷之速度主要視冷水溫度與甜玉米溫度之差、預冷水流量之大小及冷水與產品接觸面積之多寡而定,一般最適宜之冷水溫度為攝氏零度左右,冷水流量以每秒每平方公尺10公升為宜。配合直銷處理,預冷前宜將產品分級。預冷時產品之裝籃排列宜將玉米穗朝上,以提高預冷效率、縮短預冷時間。甜玉米預冷所需時間由品溫28℃降至穗軸心部4℃約需62分鐘(未去苞葉)或50分鐘(去除部份苞葉),故甜玉米之預冷宜採批式處理。預冷處理後之產品應迅速放入低溫冷藏室進行包裝,包裝方式可採20公斤塑膠袋配合紙箱或以2穗或4穗為單位的小包裝配合紙箱方式之子母包裝。甜玉米經預冷處理後維持低溫貯運極重要,短程運送可以加碎冰方弋,而長距離輸送則應採用低溫冷藏運輸車。

關鍵詞:甜玉米、保鮮、預冷。

接受日期:1991年2月11日。


Studies on the Fresh-keeping of Sweet Corn (I) — Parameter Establishment and Application of Hydrocooling

Cheng, J. J., P. L. Chan, T. I. Lu and C. T. Tseng

Summary

In order to maintain the quality of sweet corn, precooling after harvesting as soon as possible is necessary.  Where hydrocooling is one of the most effective methods.  The optimal temperature of water for the hydrocooling is about 0℃ and proper flow rate at 10 1/sec/m.  Arrangement of the silk-end of corn ears upward increased hydrocooling efficiency, and decreased hydrocooling time, respectively.  According toe the experiment, it took about 62 minutes to cool down the temperature from 28℃ to 4℃ at the center of corn cobs with 0℃ of ice water.  Therefore, sweet corn ears are kept separately a lot in the hydrocooling chamber that may speed up the precooling process.  Grading before precooling is necessary.  Corn ears should be kept in a cold storage immediately after precooling and packed in that condition.  Various kind of packing such as 20 kg/bag, 2 ears or 4 ears/pack is all feasible depending upon the consumer delight.  Corn ears after precooling should be kept in cool condition either in icebox or in cold containers during the distributing process.

Accepted for publication: February 11, 1991.



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