Metabolomics comparison of four varieties apple with different browning characters in response to pretreatment during pulp processing.

Browning commonly appeared in apple processing, which varied in different apple varieties. Present work investigated the metabolomics of four varieties apple of Yataka, Gala, Sansa, and Fuji, which possessed different browning characteristics and related enzymes. Sansa as browning insensitive apple variety, exhibited the least chroma change with the lowest PPO activity and the highest SOD activity among the four apple varieties.

[HPLC fingerprint analysis of acetoacetate extraction of Polygonum orientale].

Objective: To establish the HPLC fingerprint analysis method for the quality control of acetoacetate extraction of Polygonum orientale.

Methods: Agilent C18 (4.6 mm x 250 mm, 5 microm); DAD detector; Mobile phase: methyl alcohol-water gradient elution at a flow rate of 1.