Not sure if I'm posting in the correct board, but here goes:
I'm trying to figure out what the "K" values for polyvinylpyrrolidone (povidone) refer to. I thought K values generally were related to acid/base relationships. However, with povidone I've seen some references to viscosity, which doesn't make any sense to me. When I google it I just get a number of commercial sites with prices for povidone K15, povidone K30, povidone K90, etc.
Specifically I'm trying to figure out the relationship between K value and binding strength between povidone and iodine. My initial search seems to indicate that a lower K value translates to a lower binding strength with iodine, but I'm just not sure.
Anyone know what the K value is referring to? Anyone know if a lower or higher K value povidone would have weaker or stronger iodine binding?
Main bottom line question: If I had a K15 povidone-iodine solution and a K90 povidone-iodine solution (same concentrations, temps, pH, etc), which solution would have the higher ratio of free to bound iodine?
Thanks in advance for your help (this isn't for a test or homework!)