S.Z. Tesfay, I. Bertling, J.P. Bower
In avocado the polyphenols catechin and epicatechin are known for their anti-oxidant properties. However, they can also act as substrates of polyphenol oxidase (PPO) and greater responsible for tissue browning. In order to be able to manipulate the availability of free polyphenols and their ability to act as anti-oxidants, an in-depth understanding of preharvest production and distribution of these polyphenols is required. However, reports on the presence of catechin and epicatechin tissue distribution preharvest are scarce. The two major free and conjugated phenols (catechin and epicatechin) of fruit tissue were analysed using HPLC. The seed and the exocarp had higher concentrations of free catechin and epicatechin, while the mesocarp tissue showed higher concentrations of the conjugated forms of these phenols. As phenolics are able to participate in the induction/repression of genes as well as the activation-deactivation of enzymes and transcription factors of key metabolic pathways, their presence could increase the ability of fruit to better withstand stressful environmental conditions and, hence, increase fruit quality.
Tesfay, S.Z., Bertling, I. and Bower, J.P. (2011). SEASONAL TRENDS OF SPECIFIC PHENOLS IN 'HASS' AVOCADO TISSUES. Acta Hortic. 911, 349-354
DOI: 10.17660/ActaHortic.2011.911.40
avocado, catechin, epicatechin, phenolics

Acta Horticulturae