I am doing a colorimetry experiment with starch, and have a theoretical model based on Beer's law. To solve it, I need a known value for the molar extinction coefficients of amylose and amylopectin iodine complexes. Are these known values, and where can I find them?
While experimentally finding them would not be too hard, I cannot obtain pure amylose and amylopectin, so I cannot do this myself. I have done some research, but could not find many values(lack of research skills and access to scientific databases).
Any direction to papers or sources would be greatly appreciated.
Alternatively, a reliable and commonly available replacement for a starch standard would also solve my problem, if such a thing exists - this would make things much easier for me. This is a senior school experiment, so a compromise between accuracy and availability is expected.