Efficient Synthesis of β-Glucose 1-Phosphate through Enzymatic Phosphorolysis and Baker's Yeast Fermentation

β-Glucose 1-phosphate (βGlc1P) is a donor substrate in the synthesis of various α-glucosides by glycoside phosphorylases belonging to the glycoside hydrolase family 65. This study presents an efficient synthesis of βGlc1P combining enzymatic phosphorolysis of inexpensive maltose and baker's yeast fermentation to bias the equilibrium toward maltose phosphorolysis by removing released glucose. Mass production of βGlc1P was obtained in a 2 L reaction mixture initially containing 500 mM maltose and inorganic phosphate, with a yield of 76 %. βGlc1P was isolated from the reaction mixture by crystallization after electrodialysis to obtain 181 g of βGlc1P as a bis(cyclohexylammonium) salt.