Absorbância → Concentração

The Absorbance to Concentration calculator is a useful tool for determining the concentration of proteins in a solution. It is based on the Lambert-Beer Law, which relates the absorbance (A) of a solution to the concentration (c) of the solute, the molar extinction coefficient (ε), and the optical path length (l). The formula used is A = ε·c·l, where A is the absorbance measured at a specific wavelength, usually 280 nanometers.

The calculator works by considering the molecular weight (MW) of the protein and the molar extinction coefficient (ε) to calculate the concentration. ε is a measure of the protein's ability to absorb light at a given wavelength. The relationship between absorbance and concentration is linear, allowing for precise calculation of concentration. Note that the relationship MW ~ Abs/MW is a simplification and not exactly accurate, but serves as a useful estimate.

This calculator is particularly useful in molecular biology and biochemistry laboratories, where precise quantification of proteins is essential for many applications, including gene expression analysis, protein purification, and protein-ligand interaction studies. When using this calculator, it is important to be mindful of the units used and to ensure that the ε and MW values are accurate for the protein of interest.

It is crucial to remember that the measured absorbance can be influenced by various factors, such as the presence of other components in the solution that also absorb light at the same wavelength. Therefore, it is recommended to perform measurements under controlled conditions and use appropriate standards to ensure the accuracy of the results.