A chromogenic substrate is a commonly used reagent in chemical analysis and laboratory testing, which can produce visible color changes by reacting with specific reagents. Among them, ADPS (N-ethyl-N - (3-sulfopropyl) -3-methoxyaniline sodium salt) is a common chromogenic substrate with a CAS of 82611-88-9 The color substrate ADPS has high sensitivity because it can quickly detect changes in acidity and alkalinity present in the reaction system. This high sensitivity makes the chromogenic substrate ADPS widely used in many application fields, such as measuring enzyme activity, analyzing protein structure and function, etc. The use of color developing substrate ADPS is very convenient, with high water solubility, and can be prepared into a solution. In addition, in the experiment, only the substrate needs to be added to the reaction system, and then the chromogenic agent can be added to see clear color changes. This can intuitively reflect the pH changes present in the reaction system, allowing the experimental personnel to quickly determine whether the reaction is normal. Another advantage of the chromogenic substrate ADPS is its high reliability. This is because there is a certain relationship between the color change of the chromogenic substrate ADPS and the pH change present in the reaction system, which is very stable and reliable. However, the premise is to ensure that there are no quality issues with the ADPS used. As long as the product is reliable, experimental stability can be fully achieved. Due to its ability to react in a timely manner with changes in acidity and alkalinity in the system, the chromogenic substrate ADPS can be applied to many different reaction systems, including biochemical reactions, environmental monitoring reactions, etc. In addition, it can also be used in quantitative analysis to improve the accuracy and reliability of experimental results. The cost of color developing substrate ADPS is relatively low. Usually, although other color developing substrates are sold in the market, the price is several times higher than ADPS, so using it can reduce procurement costs. In addition, ADPS is in powder form, which is easy to store and transport. For experimental personnel, it can be tailored to local conditions, convenient to carry, and can be used in different places and times, which to some extent also reduces time costs.