Phenolic compounds play a key role in the sensory properties
of red wines [1]. There are also very convenient health benefits
associated with their consumption [2]. The total contents of phenolic
compounds, as well as the ratio between the different types of
phenolic compounds in the red grape varieties are strongly related
to the quality of resulting wines. Therefore, the determination of
phenolic levels is very interesting information in setting the best
harvest date. Usually the concentration of the phenolic compounds
increases during berry ripening; however several factors can affect
its evolution, mainly related to the viticulture practices. Therefore
controlling the ripening of berries regarding phenolic levels is one
of the most critical stages in the production of red wines.