包裝形式及貯存溫度對小包裝白米品質之影響

Effects of Packing Method and Storage Temperature on the Qualities of Small Packing Milled Rice

洪梅珠(Mei-Chu Hong) ； 宋勳(Shiun Song)

《臺中區農業改良場研究彙報》 43期 (1994/06) Pp. 7-15

https://doi.org/10.6956/BTDAIS.199406.0007

摘要

利用台中189號碾製成之白米，以不同之包裝形式，貯存於不同溫度處理，探討白米在貯存期間品質之變異，以供改善白米包裝及貯存條件之參考。結果發現白米之pH值隨貯存期延長而降低，降低程度以一般小包裝室溫貯存者最大，以真空包裝及充二氧化碳包裝之低溫貯存者最小。一般小包裝米飯的硬度及凝集性，隨貯存期之延長而增加，但粘性、附著性及均衡性則隨貯存時間之延長而降低，尤以室溫貯存者降低的速度較快，而低溫貯存者較慢。然真空包裝及充二氧化碳包裝之米飯物理性，在本試驗的貯存溫度範圍（5～10℃，15～20℃，室溫），一年內未有顯著之變化。台灣夏季氣溫常有出現30℃以上之高溫現象，故可適度推廣真空包裝、充二氧化碳包裝及低溫貯存，以延長小包裝白米保鮮之期限。

關鍵字

包裝形式 ； 貯存 ； 白米 ； 品質

並列摘要

The variety of rice, Taichung 189, processed into milled rice, was packed with vacuum, CO2 and air in PE bags and then was stored at different temperatures. The stored milled rice were sampled each month for one year to study the effect of storage time, storage temperature and packing method on the grain qualities.The results showed that pH value of milled rice decreased in parallel with the length of storage time. The smallest difference in pH value was found when the milled rice both under vacuum and with carbon dioxide flushing were stored at low temperature of 5℃ to 10℃ or 15℃ to 20℃. The pH value decreased significantly when the rice was packed in a sealed polyethylene bag and stored at room temperature.Texturometer (GTX-2-IN) was used to measure the physical properties of cooked rice. The results indicated that hardness and cohesiveness increased, but viscousness, adhesiveness and balance decreased during storage when milled rice was sealed in polyethylene bags. Those stored at low temperature showed the better physical properties than stored at room temperature after the similar length of storage. There was almost no change in the physical properties of cooked rice when milled rice both under vacuum and with carbon dioxide flushing were stored at any one of three different temperatures for one year. The summer's temperature in Taiwan is usually over 30℃, so packing milled rice under vacuum or with carbon dioxide flushing or storing it at low temperature may provide the best result in prolong fresh quality of milled rice.

並列關鍵字

packing method ； storage ； milled rice ； quality