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