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Alizarin Red S, with the CAS number 130 - 22 - 3, is a well - known synthetic dye. It is also known as Sodium alizarinsulfonate. The molecular formula of Alizarin Red S is C₁₄H₇NaO₇S, and its molecular weight is approximately 342.26 g/mol. The product usually appears as a dark red to brown powder. It is soluble in water, and the solution shows a bright red color. Factory - supplied Alizarin Red S often comes with strict quality control, ensuring its purity and stability. The low - price feature of this factory - supply product makes it an attractive choice for various industries.
Alizarin Red S has a wide range of applications. In the field of biology, it is commonly used as a stain for calcium deposits in histological and cytological studies. It can bind to calcium salts, making the calcium - containing structures visible under a microscope. This is very useful in bone research, where it can help researchers observe the growth and development of bone tissues. In the textile industry, it is used as a dye for natural fibers such as wool and silk. It can impart a beautiful red color to the fabrics, and its color fastness is relatively good. In addition, in the field of analytical chemistry, it can be used as an indicator in some titration reactions due to its color - changing properties under different chemical environments.
When using Alizarin Red S for biological staining, first, prepare a staining solution. Dissolve an appropriate amount of Alizarin Red S powder in distilled water to make a solution with a concentration of about 0.1 - 1%. Fix the biological sample properly, and then immerse it in the staining solution for a certain period, usually 15 - 30 minutes. After staining, rinse the sample gently with distilled water to remove the excess stain. For textile dyeing, dissolve the dye in warm water, and then add the fabric into the dye bath. Keep the temperature and stirring for a suitable time according to the specific requirements of the fabric and the desired color depth. In analytical chemistry titrations, add a small amount of Alizarin Red S solution to the reaction system as an indicator, and observe the color change during the titration process to determine the endpoint.
Case 1: Bone Research
A research team in a university was studying the effect of a new drug on bone growth. They used Alizarin Red S to stain the bone samples from experimental animals. After preparing a 0.1% Alizarin Red S solution, they fixed the bone samples and stained them for 20 minutes. Under the microscope, they could clearly observe the calcium deposits in the bone tissues. By comparing the stained samples of the experimental group and the control group, they found that the new drug significantly promoted bone growth, as indicated by the increased calcium staining in the experimental group.
Caso 2: Teñido de textiles
A small - scale textile factory wanted to dye a batch of wool scarves red. They dissolved Factory Supply Alizarin Red S in warm water at a concentration of 0.5%. The wool scarves were soaked in the dye bath at 70°C for about an hour with gentle stirring. After dyeing, the scarves were rinsed and dried. The resulting scarves had a bright and uniform red color, and the color fastness was tested to be satisfactory, which met the market requirements.
Case 3: Analytical Chemistry
In a chemical laboratory, a chemist was performing a complexometric titration to determine the content of calcium ions in a water sample. Alizarin Red S was used as an indicator. A few drops of the indicator solution were added to the water sample, and then the titrant was slowly added. When the color of the solution changed from red to a specific end - point color, the titration was stopped. The results showed that the content of calcium ions in the water sample could be accurately determined using Alizarin Red S as an indicator.
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