產品名稱: | 改良亮綠瓊脂;含磷酸鹽的亮綠瓊脂;根據SLMB方法的亮綠瓊脂;BPLS瓊脂 |
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英文名稱: | Brilliant Green Agar, Modified;Brilliant Green Agar with Phosphates;Brilliant Green Agar acc. SLMB;BPLS Agar |
培養基類型: | 選擇與鑒別培養基 |
級別: | for microbiology |
品牌: | ELITE-MEDIA |
產品目錄號: | M710-01、M710-02 |
產品規格: | 250g、500g 添加劑需另購 |
產品外觀: | 米色至綠色均一粉末。 |
顏色與澄清度: | 綠色至棕色凝膠。 |
保存條件: | 密封,2-25°C保存。 |
注意事項: | 避免攝入、呼入和皮膚接觸。 |
相關產品: | -- |
產品描述:
改良亮綠瓊脂(Brilliant Green Agar, modified)即根據SLMB方法的亮綠瓊脂(Brilliant Green Agar acc. SLMB),含有磷酸鹽,是一種高度選擇性培養基,用于分離和鑒定水、污水和食品中的非傷寒沙門氏菌。亮綠瓊脂不能分離傷寒桿菌和志賀氏菌。這個配方抑制劑濃度增加,選擇性增強,被國際標準組織(ISO)、歐洲共同體標準方法、美國公眾健康協會(APHA) 、官方分析化學師協會(AOAC)引用推薦用于分離和鑒別沙門氏菌。
改良煌綠瓊脂相對于其它配方的優勢在于對大腸埃希氏菌和變形桿菌的抑制作用更強;限制菌落形態與沙門氏菌相似的假單胞菌的生長,降低假陽性率;對數量少的沙門氏菌沒有抑制性。
用途:
改良亮綠瓊脂用于從污水、污泥、海鷗糞便中分離沙門氏菌。改良亮綠瓊脂用于檢測食品和飼料中的沙門氏菌。
改良亮綠瓊脂用于臨床診斷,分離和鑒定糞便等材料中的沙門氏菌。
原理:
亮綠瓊脂(Brilliant Green Agar)也稱煌綠瓊脂、亮綠酚紅乳糖蔗糖瓊脂,簡稱BG瓊脂,是一種強選擇性培養基,用于從病理材料、食品、奶制品中分離和鑒定沙門氏菌屬(傷寒桿菌除外)。亮綠瓊脂是Kristensen等人最早研制的,作為沙門氏菌選擇性分離培養基。亮綠瓊脂也是一種基于腸道菌對乳糖-蔗糖發酵能力進行鑒別的培養基。亮綠染料是抑制劑,抑制革蘭氏陽性菌和大多數革蘭氏陰性桿菌生長,對絕大多數沙門氏菌無抑制作用。酚紅作為酸堿指示劑,酸性條件下顯黃色,堿性條件下顯紅色。乳糖-蔗糖發酵產酸的細菌,菌落顯黃綠色,四周培養基顯黃綠色。沙門氏菌和其它非乳糖-蔗糖發酵型微生物菌落呈紅色、粉色或白色,四周培養基呈亮紅色。
配方與配制方法:
成分 | g/L |
肉浸粉 | 5.0 |
細菌學蛋白胨 | 10.0 |
酵母提取物 | 3.0 |
磷酸氫二鈉 | 1.0 |
磷酸二氫鈉 | 0.6 |
乳糖 | 10.0 |
蔗糖 | 10.0 |
酚紅 | 0.09 |
亮綠 | 0.0047 |
瓊脂 | 12.0 |
Final pH 6.9 +/- 0.2 |
配制方法:
稱取52g煌綠瓊脂,加1000 mL超純水,在火焰上方加熱煮沸完全溶解。不要高溫蒸汽滅菌!
冷卻至50度左右時,倒平板。待干燥后使用
實驗方法:
亮綠瓊脂培養基應該與初步篩選培養基(如麥康凱瓊脂)和富集增菌用培養基(如四磺酸鹽肉湯)協同使用。未經處理的糞便樣本放置3h后,沙門氏菌的檢出率將嚴重降低。來不及檢測的糞便樣品接種到轉移培養基上,以維持微生物的活性。
向亮綠瓊脂中添加磺胺類藥物(0.8g或1g)能夠提高沙門氏菌檢出率。加抗生素的改良煌綠瓊脂對污染微生物的抑制作用更強,假陽性的概率更低。用于從污水、污泥、海鷗糞便中分離沙門氏菌。已報道的抗生素使用組合有乙酰磺胺(1.0 mg/ml)和扁桃酸(0.25 mg/ml) ,磺胺乙酰鈉(1.0g/L)和扁桃酸鈉(0.35 g/L)。去氧膽酸鈉(2.5 g/L) 可以阻止變形桿菌的瘋長。
Organisms (ATCC) | 生長情況 | 菌落顏色 |
Salmonella thiphimurium (14028) | +++ | 紅色至白粉色 |
Salmonella enteritidis (13076) | +++ | 紅色至白粉色 |
Salmonella typhi (6539) | + | 紅色至粉色 |
Staphylococcus aureus (25923) | - | - |
Escherichia coli (25922) | -或部分 | 綠色 |
食品和飼料中沙門氏菌的檢測方法
1. One part of the food sample was added to 20 parts of Muller-Kauffmann Tetrathionate Medium.
2. After agitation, the flask of broth was placed into a 45°C waterbath for 15 minutes only.
3. The flask was then transferred to a 43°C incubator.
4. The broth was subcultured to Brilliant Green Agar (Modified) after 18 and 48 hours.
A single loopful of broth was used to streak inoculate either two 9 cm diameter plates (without recharging the loop between plates) or one 14cm diameter plate.
5. The plates were incubated at 35°C for 18-24 hours.
6. Red colonies, resembling salmonellae, were picked off the plates and subcultured to Lysine Decarboxylase Broth and Triple Sugar Iron Agar. These media were incubated at 35°C for 18-24 hours.
If the reactions on these media were positive for salmonellae then slide agglutination tests were carried out on the surface growth of the Triple Sugar Iron Agar.
污水中沙門氏菌的檢測方法
1. Take a representative sample of sewage or sludge for examination.
2. Homogenise a suitable volume in a macerator or stomacher.
3. Inoculate five 10ml samples into 35ml of Buffered Peptone Water, five 1ml samples and five 0.1ml samples into 10ml of Buffered Peptone Water. Incubate at 35°C overnight.
4. Transfer 10ml portions into 35ml of Muller-Kauffmann Tetrathionate Broth and incubate at 43°C.
5. Subculture the broths on to Brilliant Green Agar (Modified) containing Sulphamandelate Selective Supplement after 24 and 48 hours incubation.
6. Incubate the Brilliant Green Agar plates overnight at 43°C.
7. Identify suspicious (red) colonies using further diagnostic tests.
The Sulphamandelate Selective Supplement inhibits competing organisms which multiply during the resuscitation and recovery stages in Buffered Peptone Water.