An assay based on the electrochemical detection of 2,2‐diphenyl‐1‐picrylhydrazyl radical (DPPH.) for the evaluation of the total antioxidant capacity (TAC) was optimized. The assay is interchangeable with the classic spectrophotometric tests for TAC based on the same radical. In addition, it can be used for the analysis of dilute samples with low antioxidant capacities. A good linear correlation (R2=0.97) was obtained between the results obtained with the proposed electrochemical assay and the Trolox Equivalent Antioxidant Capacity test based on ABTS radical. The assay was successfully used to evaluate the antioxidant capacity of two red wines obtained by six different maceration‐fermentation techniques.

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Weather and climate play a major role in the quality and quantity of grapes and wine produced; baseline climate has been noted to significantly influence wine style, and climate variability to influence wine yields and quality differences. The greatest potential of any wine grape variety is realized only when it is harvested at the right time in order for the wines to possess the balance intended for its use. The rate of decrease in yield potential was 4.5 from 'Feteasca regala', 20.5 from 'Riesling italian', 24 from 'Cabernet Sauvignon' and 19 from 'Merlot'. The growth rate of glucoacidimetric index was 4.5 from 'Feteasca regala', 2.0 at 'Riesling italian', 14.5 at 'Cabernet Sauvignon' and 5.0 at 'Merlot'. The mathematical models for forecasting the harvest are as follows: ΔT=-0.220ΔInd-0.1317 at 'Feteasca regala', ΔT=-0.168ΔInd-0.0172 in case of 'Riesling italian', ΔT=-0.173ΔInd-0.2758 at 'Merlot' and ΔT=-0.166ΔInd-0.6745 at 'Cabernet Sauvignon'.