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.

  • $\begingroup$ Do you mean for the starch iodide complex or just plain starch? $\endgroup$ – Andrew Apr 15 at 11:11
  • $\begingroup$ Apologies, yes. I meant the starch iodine complex for amylose and amylopectin each. $\endgroup$ – jettosutorimu Apr 15 at 11:14

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