Relations between lignification and phenols metabolism or their relative enzymes in peel of postharvest winter jujube fruit (Ziziphus Jujuba Mill)
Li Hong-wei, Guo Hui-hui, Wang Zongyi, Han Tao, Chan Bizhou
Abstracts of 7th International Postharvest Symposium 2012 (IPS2012). 25-29 June, 2012. Putra World Trade Centre (PWTC), Kuala Lumpur, Malaysia. 238 pages.
2012
บทคัดย่อ
Postharvest white-mature Winter jujube (Ziziphus jujuba Mill.cv. Winter jujube) was stored at 0°Cand the contents of lignin or phenol compounds, and the activities oftheir relative enzymes, including phenylalainlyase (PAL), cinnamyl alcohol dehydrogenase (CAD) and polyphenoloxidsae (PPO) in peel of stored fruits, were measured for investigating the relation between lignification and phenols metabolism. The results showed that the content of total phenol compounds decreases gradually and the contents oflignin increased during cold storage. There was a significant negative correlation (r= -0.84) between them. Protocatechic, chlorogenic acid, caffeic acid, catechin, epicatechin, pcoumaric acid, rutin, cinnamic acid, and quercetin were detected by high performance liquid chromatography and mass spectrometry (HPLC-MS). The contents of catechin, epicatechin, p-coumaric acid changed obviously during storage, and the others showed mild changes. There were significant positive correlations between lignification and activities of PAL (r= 0.819) or PPO (r= 0.85), which implicated the promotion of lignification by PAL and PPO. CAD activity had little effect on changes of lignin (r= - 0.067).