查詢結果分析
相關文獻
- Effect of Incubation Conditions on the Reduction of Nitrate to Nitrite by Micrococcus Roseus and Escherichia Coli O157:H7
- The Fluctuation of Carbohydrates and Nitrogen Compounds in Flooded Wax-apple Trees
- 市售鴨□中保色劑及硼砂之調查
- 乳酸菌發酵之魚肉香腸加工
- Photochemistry of Methylnitrite (CH[feb0]ONO) in Solid Neon
- Rapid Analysis of Nitrite and Nitrate in Meat Products Using Microwave Assisted and Solid Phase Extraction
- 探討亞硝酸鹽的健康危害
- 肴肉火腿的研製
- Influence of Food Additives on the Residual Sulfamethazine Level in Pork Processing
- Biochemical Changes in Ziziphus Xylopyrus by VA Mycorrhizae
頁籤選單縮合
題 名 | Effect of Incubation Conditions on the Reduction of Nitrate to Nitrite by Micrococcus Roseus and Escherichia Coli O157:H7=培養條件對Micrococcus roseus及Escherichia coli O157:H7硝酸鹽還原成亞硝酸鹽的影響 |
---|---|
作 者 | 柯文華; 陳炳輝; 丘志威; | 書刊名 | 藥物食品分析 |
卷 期 | 11:2 2003.06[民92.06] |
頁 次 | 頁164-170+175 |
分類號 | 412.37 |
關鍵詞 | 硝酸鹽還原; 亞硝酸鹽; Micrococcus roseus; Escherichia coli O157:H7; Nitrate reduction; Nitrite; |
語 文 | 英文(English) |
中文摘要 | 本試驗目的在比較Escherichla coli O157: H7與Micrococcus roseus、 Micrococcus luteus、Staphylococcus carnosus及Vibrto parahaemolyticus四株微生物於含2053mg/L硝酸重之磷酸緩衝溶液中硝酸鹽還原成亞硝酸鹽的情形,並探討培養條件對M. roseus及E. coli O157: H7硝酸鹽轉換成亞硝酸鹽的影響。M. roseus、E. coli O157: H7及S. carnosus之間的還原能力相似,但較其他菌株強。M. roseus及E. coli O157: H7在pH 7時的硝酸鹽還原能力最大,但pH值小於5或溫度低於15℃時則被抑制。硝酸鹽之還原隨初菌數的增加顯著增強,當初菌數為4 log CFU/mL時,這原作用達到最高,然而初菌數愈高則還原率愈強。含503-2006mg/L硝酸鹽之pH7緩衝溶液中,M. roseus及E. coli O157: H7均可還原約80%的硝酸鹽,但當硝酸鹽含量大於2006 mg/L時,還原能力被抑制。E. coli O157. H7於含2098 mg/L硝酸鹽、37℃、pH 7之緩衝溶液中的硝酸鹽還原量在24小時內可達平衡。本研究顯示雖然E. coli O157: H7具有強硝酸鹽還原特性,但是所需要的菌量極高,已達到引起食物中毒的危險性,因此在食物系統中不易發生。 |
英文摘要 | Nitrate reduction of Escherichia coli O157: H7 was compared with that of four microorganisms, namely, Micrococcus roseus, Micrococcus luteus, Staphylococcus carnosus and Vibrio parahaemolyticus in phosphate buffer solution containing 2053 mg/L nitrate, and the factors affecting nitrate reduction of M. roseus and E. coli O157: H7 were also studied. M. roseus, E. coli O157: H7 and S. carnosus showed similar but stronger reduction activities than the other test microorganisms, showing optimum activity in pH 7 buffer solution containing nitrate. Very little nitrite was formed when pH and temperature were below 5 and 15°C, respectively. Nitrate reduction was significantly increased with cell density and reached optimal level at 4 log CFU/mL. However, the reduction rate was significantly increased with increasing initial cell counts after 24 h incubation. About 80% nitrate was reduced in pH 7 buffer solution containing 503-2006 mg/L nitrate by M. roseus and E. coli O157: H7 at 37°C after 24h incubation, and the reduction reaction was inhibited at nitrate levels above 2006 mg/L. The reduction of nitrate to nitrite by E. coli O157: H7 in pH 7 buffer solutions containing 2098 mg/L nitrate at 37°C reached optimal level after 24 h. Results clearly show that E. coli O157: H7 was very active in the reduction of nitrate to nitrite, the number required to reduce nitrate would be extremely hazardous. Thus, nitrate reduction by E. coli O157: H7 would be inconsequential in real systems. |
本系統中英文摘要資訊取自各篇刊載內容。