TLC analysis of enzymatic synthesis of N-acetylglucosamine 1-phosphate (GlcNAc-1-P) and N-acetylgalactosamine 1-phosphate (GalNAc-1-P) using N-acetylhexosamine 1-kinase (NahK). The enzymatic reactions were carried out for 19 h. The developing solvent used was n-butanol:acetic acid:water = 2:1:1 (v/v/v). The plate was stained with p-anisaldehyde sugar stain. Lane: 1, N-acetylglucosamine (GlcNAc); 2, GlcNAc-1-P authentic sample; 3, reaction mixture of GlcNAc using NahK; 4, N-acetylgalactosamine (GalNAc); and 5, reaction mixture of GalNAc using NahK.