Antioxidant Activity and Total Polyphenol Content of Different Varieties of Grape from the Small Carpathians Wine Region of Slovakia

The aim of the present study was to determine antioxidant profile (antioxidant activity, total polyphenol, phenolic acid, flavonoid and in red varieties also anthocyanin content) in two red grape varieties (Dornfelder, Blaufränkisch) and ten white varieties (Sauvignon Blanc, Welschriesling, Weisser Riesling, Irsai Oliver, Pinot Blanc, Palava, Müller-Thurgau, Grűner Veltliner, Feteasca Regala and Chardonnay) produced in the Small Carpathians wine region of Slovakia in the year 2018. The antioxidant activity tested by DPPH method was the highest in Dornfelder variety: 0.73±0.03 mg TEAC/g fresh matter (TEAC – Trolox equivalent antioxidant activity). The highest content of total polyphenol was detected in Dornfelder and Feteasca Regala (2.36 ±0.07 mg GAE/g and 0.86 ±0.13 mg GAE/g fresh matter; GAE – gallic acid equivalent), respectively. The highest total flavonoid content was found in Dornfelder and Blaufränkisch (1.29 ±0.09 mg QE/g and 0.34 ±0.02 mg QE/g fresh matter; QE – quercetin equivalent) and the highest total phenolic acid content in Dornfelder and Feteasca Regala samples (1.23 ±0.18 mg CAE/g and 0.41±0.05 mg CAE/g fresh matter; CAE – caffeic acid equivalent). The higher level of total anthocyanins was determined in Dornfelder (3.96±0.11 mg/g fresh matter) in comparison with Blaufränkisch. The obtained results confirmed that the grape is a good source of compounds with antioxidant activity.