於 2002 年 5 月上旬在市面上購買進口米與國產米，並進行品質分析，比較其間之差異，以供消費者買米及各界參考用。結果發現以日本魚沼越光米及新潟越光米最貴 ( 約 250 元 /kg) ，其價格為國產越光米的 3 倍，為國產 CAS 良質米臺稉 9 號的 5 倍，美國加州米及泰國香米的價格則與國產 CAS 良質米臺稉 9 號較相近。外觀品質除國產臺中秈 10 號符合 CNS 二等白米規格外，其餘均符合 CNS 一等白米規格。泰國香米屬長粒細長形米，美國加州米及國產臺中秈 10 號屬中粒中間形米，其餘均屬短粒粗圓形米。國產越光米的胺基酸組成中，絲胺酸、甲硫胺酸及胱胺酸所佔的比率均比日本新潟越光米及魚沼越光米高。白米液 pH 值以泰國香米最低，粗蛋白質含量以泰國香米、國產臺中秈 10 號及國產越光米較高，而以日本越光米及美國加州米較低。米飯食味以日本越光米最佳，泰國香米最差。
關鍵字： 進口米、國產米、米質 。
The imported and domestic rice were sampled from supermarket to investigate the variation of rice quality in early May 2002. The information can be useful to consumers in buying high quality milled rice. The results showed that the price of Niigata Koshihikari and Uonuma Koshihikari is the most expensive, which is about 250 NT/kg. The price was three and five times to domestic Koshihikari and CAS Taikeng 9, respectively. However the price of California rice and Thailand aroma rice are similar to domestic rice of CAS Taikeng 9. The quality of all rice samples reached the CNS first grade of milled rice, except domestic rice of Taichung sen 10 which reached the second grade. Thailand aroma rice is long grain type and slender in shape, California rice and domestic rice of Taichung sen 10 are medium grain type and intermediate in shape, other samples belong to short grain type and round in shape. The proportions of serine, methionine and cystine in domestic Koshihikari were higher than Niigata Koshihikari and Uonuma Koshihikari. The pH value of Thailand aroma rice was the lowest among all tested samples. The crude protein contents of Thailand aroma rice, domestic rice of Taichung sen 10 and domestic Koshihikari were higher than those of Niigata Koshihikari, Uonuma Koshihikari and California rice. Niigata Koshihikari and Uonuma Koshihikari showed better palatability, however the Thailand aroma rice was the worst in contrast.
Key words: imported rice, domestic rice, rice quality .