Table 1. Comparison of incorporation mechanisms and efficiencies of uniformly labeled (UL) ¹³C-monosaccharides in intestinal Caco-2 and hepatic KKU-M213 cell lines.

13C-Saccharide	Incorporation mechanism		% Incorporation				% (Number of 13C/total number of C)
			Man8GlcNAc2		Hex5HexNAc4Fuc1NeuAc1		Man8GlcNAc2		Hex5HexNAc4Fuc1NeuAc1
	Caco-2	M213	Caco-2	M213	Caco-2	M213	Caco-2	M213	Caco-2	M213
UL-13C-Glc	Glycolysis	Glycolysis	86%	98%	86%	97%	91%	97%	86%	95%
UL-13C-Man	Glycolysis	Glycolysis & intact	82%	95%	78%	97%	88%	84%	72%	68%
UL-13C-Gal	Glycolysis	Intact	80%	37%	75%	82%	88%	9%	80%	15%
UL-13C-Fruc	Glycolysis	Glycolysis & intact	84%	91%	76%	92%	86%	86%	72%	83%