In enzymology, a glucose-1-phosphatase is an enzyme that catalyzes the chemical reaction alpha-D-glucose 1-phosphate + H2O ⇌ {\displaystyle \rightleftharpoons } D-glucose + phosphateThus, the two substrates of this enzyme are alpha-D-glucose 1-phosphate and H2O, whereas its two products are D-glucose and phosphate. Wikipedia