Assertion: polysaccharide's material | /r/HasAspect | acid ph
Facets:
Source sentences:
text: The deacetylation chitosan material that the present invention preferably uses has acid pH, generally is 4-6, more preferably 4-5.5, even more preferably 4.5-5.5.Highly preferred pH is about pH5, and this is corresponding to the pH of skin.