Ground Cinnamon and Water
Why doesn't powdered cinnamon dissolve in water?
Powdered cinnamon is the ground up bark of the tree "Cinnamomum
zeylanicum" or "Cinnamomum Joureirii", Celon And Saigon cinnamon
respectively. So a major component of the cinnamon powder is water
insoluble cellulose. The flavor is a mixture of volatile organic
compounds, a major component being cinnamanaldehyde, which is not
very water soluble. There are other various "oils" present. These
tend to make cinnamon not easily "wetted" by water, so it appears
"insoluble". It can be dispersed in water with vigorous stirring,
heat and other components in a food recipe. But it is not truly
"soluble" in the usual sense of individual molecules being present
in the fluid phase.
Update: June 2012