Red, White, And…Orange? A New Look into an Old Wine (P20-007-19)

Abstract

ObjectivesOrange wine is essentially white wine that is produced similarly to red wines, with skin-contact during maceration. Various polyphenols found in red wine may be contributing to the observed benefits on heart health. The objective is to identify if grape skin contact gives orange wine similar antioxidant properties as red wine, by comparing total polyphenols and antioxidant capacity of red, white, and orange wines. MethodsFifteen wine samples were analyzed in triplicates (4 red, 8 orange and 3 white wines). A set of orange, red and white wines from the same wineries and vintages were purchased and analyzed. Analysis consisted of total polyphenols, total antioxidant capacity, and color. Total polyphenols were measured using the Folin Ciocalteu method (gallic acid equivalent per liter (GA/L)), total antioxidant capacity was measured using the ORAC method (micromol of Trolox equivalent per mililiter (μmol TE/ml)) and color was measured using a colorimeter (Lab color scale). ResultsTotal polyphenol content in orange wines (1259.2 + 138.9 mg GA/L) was 0.6 times of red wines (2239.4 + 156.9 mg GA/L) and 4.6 times higher than white wines (273.9 + 11.8 mg GA/L). Similarly, the antioxidant capacity of orange wine (12.2 + 1.9 μmol TE/ml) was 0.6 times of red wines (20.9 + 2.7 μmol TE/ml) and 2.3 times higher than white wines (4.9 + 0.9 μmol TE/ml). Differences in total polyphenols and antioxidant capacity between types of wines were significantly different (ANOVA, α = 0.05). Color of orange wines had great variability, ranging from pale to deep orange and confirmed by the wide range of a and b color values (0.3 to 2.9 and 13.3 to 25.5 respectively). Many factors can contribute to this variation, including grape variety, winery, methods of production and storage; only two countries have a legal definition of orange wine or skin-contact white wine, thus adding additional variability. ConclusionsThis allows for understanding of the characteristics of orange wines, which may have a beneficial effect on heart health and how it compares with other wine styles. Funding SourcesCalifornia State University, Northridge.