| Abstract
| - The anthocyanin composition of Syrah grapes harvested at different stages of ripening and producedusing organic or conventional agriculture was studied. Samples of grapes were collected from veraisonto full maturity in each plot, and the content in nine anthocyanins was determined by high-performanceliquid chromatography with diode array detection. The total content in anthocyanins during ripeningof the conventionally grown grapes was significantly higher compared to that found in the organicproduction. The accumulation of anthocyanins reached a maximum 28 days after veraison (inagreement with high temperature) and then decreased until harvest. In all samples, grapes from theconventional agriculture presented higher proportions of delphinidin, petunidin, malvidin, and acylatedmalvidin glucosides compared to grapes from organic agriculture. In contrast with other comparativestudies of organically and conventionally grown plants, the results demonstrated a higher content inanthocyanins in conventionally grown grapes. Keywords: Anthocyanins; grapes; HPLC; conventional agriculture; organic agriculture
|
