Abstract: Objective: The browning control of Dangshan pear juice concentrates (PJC)during storage was studyied by ion exchange technolnogies. Method: 20 Brix°ultrafilter Dangshan pear juice was treated with FPC-21 (cation exchange resins) and FPA-53 (anion exchange resins) sequentially, and then concentrated to 70Brix°, stored at 37 ℃ over 40 days, then colour(T440nm) and browing index (A440nm)was measured. Result: Treating the juice with ion exchange resins reduced total amino acid (AA)content, browing index and metallic ions. Mixtures of untreated and treated pear juice in different proportions was concentrated and stored. Results showed that the browning rate constant content decreased with total AA, and they were linear dependence. Condusion: Ion exchange technolnogies can control brownin rate of PJC during storage. 更多还原

Key words: Dangshan pear juice concentrates, cation exchange resin, anion exchange resin, storage, browning