4,6-Ethylidene-4-nitrophenyl-α-D-maltoheptaoside (EPS-G7) is a chromogenic substrate widely used for the determination of α-amylase activity in biochemical and clinical assays. The compound contains a maltoheptaoside oligosaccharide chain linked to a p-nitrophenyl chromogenic group, enabling colorimetric detection after enzymatic hydrolysis.
In the presence of α-amylase and auxiliary enzymes such as α-glucosidase, the substrate is cleaved to ultimately release p-nitrophenol (pNP). Under alkaline conditions, p-nitrophenol produces a yellow chromogenic product, which can be quantitatively measured by spectrophotometry.
Because of its specificity and reliability, EPS-G7 is widely used in clinical chemistry assays, enzymology research, and diagnostic reagent development for measuring α-amylase activity.
4,6-Ethylidene-4-nitrophenyl-α-D-maltoheptaoside functions as a chromogenic substrate for α-amylase detection.During the enzymatic reaction:
The increase in absorbance is proportional to α-amylase activity in the sample.
This compound is commonly used for quantitative determination of α-amylase activity in biological and biochemical samples.Typical applications include:
EPS-G7 is widely used in clinical chemistry assays designed to measure α-amylase activity in biological fluids.Applications include:
The compound can be applied in enzyme kinetics experiments investigating catalytic properties of amylases.Typical uses include:
EPS-G7 is also used in biochemical and pharmaceutical studies involving carbohydrate-degrading enzymes.Applications include:
| Parameter | Recommended Conditions |
| Detection Method | Colorimetric spectrophotometric detection |
| Detection Wavelength | 405 nm |
| Buffer Systems | Phosphate buffer or Tris buffer |
| Temperature | 25–37 °C |
| Assay Format | Spectrophotometric assays, microplate reader assays |
Optimization may be required depending on enzyme source and assay design.
What is 4,6-Ethylidene-4-nitrophenyl-α-D-maltoheptaoside used for?
It is primarily used as a chromogenic substrate for α-amylase activity assays in biochemical and clinical diagnostic research.
What wavelength is used to detect the reaction product?
The released p-nitrophenol is typically measured at 405 nm under alkaline conditions.
Why is EPS-G7 commonly used in clinical amylase assays?
Because it provides specific, reliable, and sensitive colorimetric detection of α-amylase activity, making it suitable for clinical laboratory analysis.
