The product named "High Quality 2-Nitrophenyl-beta-D-galactopyranoside CAS 369-07-3 With Best Price" is a well - known chemical compound. The CAS number, 369 - 07 - 3, is a unique identifier for this specific chemical, which helps in accurate identification and sourcing in the chemical market.
2 - Nitrophenyl - beta - D - galactopyranoside is a synthetic substrate commonly used in biochemical research. It has a molecular formula that can be determined through advanced analytical techniques. Physically, it may present as a white or off - white powder, with a certain solubility in appropriate solvents such as water and some organic solvents. The purity of this high - quality product is strictly controlled during the manufacturing process to ensure reliable experimental results.
2 - Nitrophenyl - beta - D - galactopyranoside is primarily used in the field of biochemistry and molecular biology. It is a substrate for the enzyme beta - galactosidase. When beta - galactosidase acts on 2 - Nitrophenyl - beta - D - galactopyranoside, it cleaves the galactopyranoside bond, releasing 2 - nitrophenol. The amount of 2 - nitrophenol released can be measured spectrophotometrically at a specific wavelength (usually around 420 nm), allowing for the quantification of beta - galactosidase activity.
This property makes it widely used in enzyme assays. For example, in genetic research, it can be used to detect the expression of genes that encode beta - galactosidase. In the study of gene regulation, the change of beta - galactosidase activity can reflect the state of gene expression, providing important information for understanding gene function and regulatory mechanisms.
When using 2 - Nitrophenyl - beta - D - galactopyranoside, it is essential to follow good laboratory practices. First, prepare an appropriate buffer solution according to the experimental requirements. The buffer should have a suitable pH value to maintain the optimal activity of beta - galactosidase.
Dissolve 2 - Nitrophenyl - beta - D - galactopyranoside in the buffer to prepare a substrate solution of a certain concentration. Add the enzyme sample to the substrate solution, and start the reaction. Incubate the reaction mixture at a specific temperature (usually around 37°C) for a certain period of time, depending on the specific experimental design.
After the reaction is completed, stop the reaction by adding a stop solution. Then, measure the absorbance of the reaction mixture at the appropriate wavelength using a spectrophotometer. Based on the standard curve, the concentration of the product (2 - nitrophenol) can be calculated, and then the activity of beta - galactosidase can be determined.
Case Study 1: Gene Expression Detection in Bacteria
In a study of E. coli gene expression, researchers used 2 - Nitrophenyl - beta - D - galactopyranoside to detect the expression of the lacZ gene, which encodes beta - galactosidase. They first cultured E. coli under different growth conditions, including the presence and absence of lactose. Then, they prepared cell lysates and added them to the substrate solution containing 2 - Nitrophenyl - beta - D - galactopyranoside.
After a 30 - minute incubation at 37°C, they stopped the reaction and measured the absorbance. The results showed that in the presence of lactose, the expression of the lacZ gene increased significantly, as indicated by a higher absorbance value, which was consistent with the theory of lac operon regulation.
Case Study 2: Enzyme Inhibition Study
A group of researchers was interested in studying the inhibitors of beta - galactosidase. They prepared different concentrations of an inhibitor and added them to the reaction mixture containing 2 - Nitrophenyl - beta - D - galactopyranoside and beta - galactosidase. By measuring the absorbance at different time points, they found that the inhibitor could effectively reduce the activity of beta - galactosidase in a dose - dependent manner, which provided valuable information for drug development targeting this enzyme.
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