0120216

Half Fraser Broth in Bags

For enrichment of samples for Listeria sp. and Listeria monocytogenes in accordance with ISO 11290, suitable for microbiology

• 同義詞: Fraser broth primary enrichment
• 分類程式碼代碼: 41106200
• NACRES: NA.74

屬性

• agency: ISO 11290; according to ISO 11290
• 品質等級: 200
• 無菌: sterile
• 形狀: liquid
• 儲存期限: limited shelf life, expiry date on the label
• 特點: ready-to-use
• 成份: acriflavin hydrochloride, 0.0125 g/L ; ammonium ferric citrate, 0.5 g/L ; casein peptone, 5 g/L ; di-sodium phosphate dihydrate, 12.0 g/L ; esculin, 1.0 g/L ; lithium chloride, 3.0 g/L ; meat extract, 5 g/L ; meat peptone, 5 g/L ; nalidixic acid, 0.010 g/L ; potassium dihydrogen phosphate, 1.35 g/L ; sodium chloride, 20 g/L ; yeast extract, 5 g/L
• 技術: microbiological culture: suitable
• 最終pH值: 7.2±0.2 (25 °C)
• 應用: agriculture; environmental; food and beverages; industrial qc; pathogen testing; sample preparation; microbiology
• 適合性: Listeria spp.

描述

一般說明

Half Fraser broth is a selective enrichment medium designed to help the recovery of Listeria sp. This medium contains peptone, casein, yeast extract, and meat extract, which provide essential nutrients like carbon and nitrogenous compounds, including vitamins, amino acids, and trace ingredients. Phosphates buffer the medium while sodium chloride maintains osmotic equilibrium. Nalidixic acid and acriflavine inhibit the growth of Gram-negative and Gram-positive organisms respectively, except Listeria sp. Listeria sp. hydrolyze esculin to glucose and esculetin. The latter combines with ferric ions of ferric ammonium citrate, resulting in the formation of 6-7-Dihydroxycoumarin, a black-brown complex. Ferric ammonium citrate also enhances the growth of L. monocytogenes. The high salt tolerance (of sodium chloride) of Listeria is used as means to inhibit the growth of Enterococci. Lithium chloride is also used to inhibit Enterococci, which also possess the ability to hydrolyze esculin.

應用

Half Fraser broth is used for the selective pre-enrichment and detection of Listeria sp. in food and environmental specimens.

安全資訊

• 儲存類別代碼: 12 - Non Combustible Liquids
• 水污染物質分類（WGK）: WGK 2
• 閃點（°F）: Not applicable
• 閃點（°C）: Not applicable