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In the transformation of glucose to lactate the hexose is split into two halves and the atoms are rearranged. The empirical formulae of glucose and lactic acid are;
So it's possible to make two moles of lactic acid from one mole of glucose with no net addition or removal of atoms.
Although lactic acid has the right empirical formula for a monosacharide carbon 1 is more oxidised and carbon 3 is less oxidised than the closest monosacharide - glyceraldehyde. So you need to split glucose into two three carbon monosacharides and then rearrange.
Glyceraldehyde Lactate
Author: Jon Maber
j.r.maber@leeds.ac.uk
Dept Biochemistry & Molecular Biology, The University of Leeds, U.K.