Previous work using spectrophotometric assays reported that E. coli YjhC showed a weak interaction with Neu5Ac, with an apparent Km of 68.8 mm (20). Here, we used ESI-MS to assess the activity of YjhC against 2,7-anhydro-Neu5Ac or Neu5Ac. If you have any thoughts regarding exactly where and how to use manufacturer of sialic acid powder for cosmetic Ingredien...