# The extinction coefficients of oxymyoglobin and ferryl myoglobin

I want to know what the extinction coefficients of oxymyoglobin and ferryl myoglobin are. I was able to find the one for the oxymyoglobin in this pretty old article (it says that it equals $$121 \text{mM}^{-1}\text{cm}^{-1}$$), but I couldn't locate any other reference supporting this claim. Furthermore, I couldn't find any reference in the case of ferryl myoglobin.

I am also curious if, in general, there are tables containing the extinction coeffcients of various compounds (at different wavelengths).

• Which organism are you interested in? They will be very similar among mammals, but not identical. Also, for which wavelength do you want to know it?
– Karsten
Mar 20 at 21:26
• @Karsten I am interested in horse heart Mb and I want to know it for the absorption maximum, so somewhere around 410-425 nm for the Soret band. Mar 20 at 21:33
• Which pH are you interested in?
– Karsten
Mar 20 at 22:16
• @Karsten I am interested in pH 9. Mar 20 at 22:44