I searched it but i see different results on the literatures. It may be 0.002 M but i am not sure.
Using 1-anilino,8-naphthalenesulfonic acid (ANS) as a probe, we examined properties of micelles of Cremophor EL, an amphipathic agent which can solubilize hydrophobic photosensitizing agents and promote their distribution to plasma lipoprotein. In aqueous solution, Cremophor micelles persisted for several hours after dilution below the critical micellar concentration (CMC). After equilibrium was reached, we found a CMC of 0.009% (wt/vol).
'micelles persisted for several hours after dilution below the critical micellar concentration (CMC)', this suggests that result is due solubilized ANS, rather than an inherent property of the micelles.
Hello, Irfan! BASF reports that CMC of Kolliphor EL and Kolliphor ELP is 0.02%.
I think it is the same as Cremophor.
https://www.google.fr/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwjAwpv5xZjYAhWIEuwKHRvRASQQFggrMAE&url=https%3A%2F%2Findustries.basf.com%2Fen%2FdocumentDownload.8800437676501.Solubility%2520Enhancement%2520with%2520BASF%2520Pharma%2520Polymers%2520-%2520Solubilizer%2520Compendium.pdf&usg=AOvVaw3X8vFQK2W2wvMnFPr0Fk19
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