How do you calculate the mass extinction coefficient?

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According to Beer’s law, A = εbc, where A is the absorbance, ε is the molar extinction coefficient, b is the path length of the cuvette and c is the concentration. Thus, the molar extinction coefficient can be obtained by calculating the slope of the absorbance vs. concentration plot.

What is meant by mass attenuation coefficient?

The mass attenuation coefficient is a measure of the probability of the interaction that occurs between incident photons and the matter of the unit mass per unit area.

What is the formula for mass coefficient?

The Mass Attenuation Coefficient, μ/ρ from which μ/ρ can be obtained from measured values of Io, I and x. Note that the mass thickness is defined as the mass per unit area, and is obtained by multiplying the thickness t by the density ρ, i.e., x = ρt.

Why is the extinction coefficient important?

Extinction coefficient, a measure of how strongly a substance absorbs light at a specific wavelength, is the intrinsic property of a protein depending on its composition and structure. Hence, to precisely determine protein concentration, it is fundamental to accurately determine extinction coefficient.

How do you calculate the extinction coefficient of a protein?

The extinction coefficient is the absorbance divided by the concentration and the pathlength, according to Beer’s Law (epsilon = absorbance/concentration/pathlength). The units of extinction coefficients are usually M-1cm-1, but for proteins it is often more convenient to use (mg/ml)-1cm-1.

Why do we use mass attenuation coefficient?

Thus, it characterizes how easily a mass of material can be penetrated by a beam of light, sound, particles, or other energy or matter. In addition to visible light, mass attenuation coefficients can be defined for other electromagnetic radiation (such as X-rays), sound, or any other beam that can be attenuated.

What factors affect extinction coefficient?

The three factors include: The amount of light absorbed by the substance for a specific wavelength. The distance that the light travels through the solution. The concentration of the absorbing solution per unit volume.

Is the extinction coefficient The slope?

Indeed the slope of your absorption spectrum would be your extinction coefficient as long as your pathlength is fixed (according to Beer-Lambert law) and you can accurately determine the concentration of each sample.