酚红又称苯酚红,是一种深红色结晶性粉末,分子量为354.38,CAS号为143-74-8。可溶于水、醇、丙酮,几乎不溶于醚和氯仿。其溶于氢氧化碱或碳酸碱溶液中呈深红色,在空气中稳定,可用于微生物培养中的鉴别培养基。
酚红溶液 (0.5%)由苯酚红、去离子水组成,并含有少量碱,溶液呈深红色,可以作为 D-Hanks、Hanks、MEM、RPMI1640、DMEM 等溶液的指示剂。当pH大于7.8时,呈紫红色;pH为7.6时,呈桃红色;pH为7.4时,呈红色;pH为7.0时,呈橘红色;pH为6.5时,呈黄色;pH低于6.5时,呈柠檬黄色。由于大部分细胞培养用溶液pH接近7.4-7.6,当加入酚红溶液后,常呈红色或桃红色;当溶液 pH 值下降时,其颜色由红色变为黄色,此时不利于细胞的正常生长,提示实验人员调整pH至合适范围。本产品仅用于科研领域,不用于临床诊断或治疗。
操作步骤 (仅供参考):
1、无需配制,直接使用。
2、酚红溶液0.5%相当于5 mg/L,一般500ml溶液中加入1-2ml即可。
3、在Hanks、MEM、RPMI-1640、DMEM等溶液中的工作浓度一般为 0.01-0.02‰(即10-20mg/L),即稀释250-500倍后使用。也可根据实际需要添加或减少加入量。
注意事项:
1、应注意无菌操作,避免被微生物污染。
2、该试剂经0.22um过滤除菌,如溶液中出现悬浮物,应弃用。
3、为了您的安全和健康,请穿实验服并戴一次性手套操作。
Phenol red, also known as phenolsulfonphthalein, is a dark red crystalline powder with a molecular weight of 354.38 and a CAS number of 143-74-8. It is soluble in water, alcohols and acetone, and almost insoluble in ethers and chloroform. When dissolved in alkali hydroxide or alkali carbonate solutions, it turns dark red and remains stable in the air, making it suitable for use as a component in differential media for microbial culture.
The 0.5% Phenol Red Solution is composed of phenol red, deionized water and a small amount of alkali, presenting a dark red color. It can serve as an indicator for solutions such as D-Hanks, Hanks, MEM, RPMI 1640 and DMEM. The color of the solution varies with pH values: It turns purple-red when pH>7.8; It turns peach-red when pH=7.6; It turns red when pH=7.4; It turns orange-red when pH=7.0; It turns yellow when pH=6.5; It turns lemon yellow when pH<6.5. Since the pH of most cell culture solutions is close to 7.4-7.6, the solution usually appears red or peach-red after adding phenol red solution. A color change from red to yellow indicates a decrease in pH, which is detrimental to the normal growth of cells and reminds experimenters to adjust the pH to an appropriate range. Note: This product is for research use only and not intended for clinical diagnosis or treatment.
Operating Procedures (For Reference Only)
1. Ready to use without further preparation.
2. The concentration of 0.5% phenol red solution is equivalent to 5 mg/mL. Generally, 1-2 mL of the solution can be added to 500 mL of the target medium.
3. The recommended working concentration in solutions like Hanks, MEM, RPMI-1640 and DMEM is 0.01-0.02‰ (i.e., 10-20 mg/L), which means the stock solution should be diluted 250-500 times before use. The dosage can be increased or decreased according to actual needs.
Precautions
1. Ensure aseptic operation during use to avoid microbial contamination.
2. This reagent has been sterilized by filtration through a 0.22 μm membrane. Discard the solution immediately if any suspended matter appears.
3. For your safety and health, wear a lab coat and disposable gloves during operation.