Enzymatic glycosylation for the production of N-acetyl-d-lactosamine from glucose-6-phosphate and N-acetyl-d-glucosamine (a) [208]. The ΔrG′° represents the standard change in Gibbs free energy (b) was calculated using the eQuilibrator web interface (http://equilibrator.weizmann.ac.il) [155] using the following conditions: ionic strength 0.1 M, pH 7.0, 1 mM of component, 298 K. Abbreviations: Glc-6-P, d-glucose-6-phosphate; Glc-1-P, d-glucose-1-phosphate; P2O74−, pyrophosphate; HPO42−, orthophosphate; UDP, uridine diphosphate; PGM, Phosphoglucomutase; UDPG-P, UDP-glucose pyrophosphorylase; GalE, UDP-galactose epimerase; GalT, galactosyltransferase; PK, pyruvate kinase.