[Changes in cell wall components and cell wall-degrading enzyme activities of postharvest longan fruit during aril breakdown].

Longan (Dimocarpus longan Lour.) fruits are very susceptible to pericarp browning and aril breakdown, and postharvest aril breakdown is one of the most important factors degrading the quality and shorting storage life of longan fruit. Changes in aril breakdown index, cell wall components and cell wall-degrading enzyme activities in aril of longan cv.

[The relationship between the desiccation-induced browning and the metabolism of active oxygen and phenolics in pericarp of postharvest longan fruit].

Longan (Dimocarpus longan Lour.) fruits are very susceptible to water loss and pericarp browning, and postharvest pericarp browning is the most important factors degrading the quality of longan fruit and shorting storage life. Pericarp browning has been attributed to desiccation, chilling, heat stress, senescence and pest or pathogen attack.

[Studies on chemical constituents in the peels of Citrus changshan-huyou (I)].

Objective: To reveal the pharmacological activities of the components for their further utilization and development by studying the chemical constituents of Citrus changshan-huyou.

Method: The structures were determined by repeated silica gel chromatographic separation and spectral analysis.

Result: Five compounds were obtained, and identified as 3-oxo friedelin (I), limonin (II), beta-sitosterol (III), 8-(2',3'-dihydroxy-4'-methylbutane)-7-methoxycoumarin (IV), sucrose (V).