“…The oxidation product is fluorogenic, and can be estimated in a coupled system for continuous or discontinuous assay of trehalase (514). Eugenol can be replaced by p-hydroxyphenyl acetic acid, and the oxidation product measured fluorimetrically (515 Plant trehalases have not been purified to a great extent; the enzyme from the pollen of Pinus densifora has been purified 81-fold (506). There are no reports of multiple forms of the enzyme; however, it is not certain whether the soluble and insoluble enzymes from various sources are identical.…”