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Keywords:

  • aroma;
  • antioxidant activity;
  • dessert wine;
  • phenolics;
  • HPLC tandem MS;
  • SPME-GC-MS

Abstract

A traditional sweet dessert wine from Saracena (Italy), made with nonmacerated local white grapes (Guarnaccia, Malvasia and Moscato), was analyzed for phenolics and aroma profile and antioxidant activities. The most abundant classes of phenols identified by high-performance liquid chromatography were hydroxybenzoic acids and flavan-3-ols, where gallic acid showed the highest content (376.5 mg/L). The analysis by solid phase microextraction-gas chromatography-mass spectrometry revealed the presence of superior alcohols (from iso-butanol and iso-amyl alcohol up to 2-phenylethanol) and their ethyl esters, terpenes (such as linalool), furfuryl compounds, and free fatty acids (up to palmitic acid) as the key odorants of this wine. The antioxidant activity, evaluated by different in vitro assays 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid (ABTS), and β-carotene bleaching test), showed that passito wine had a radical scavenging activity (IC50 value of 0.03 v/v against DPPH·) and inhibited linoleic acid oxidation with an IC50 value of 0.4 v/v after 30 min of incubation.

Practical Application

It is well known that moderate consumption of wine is actually recommended since it appears associated with a decreased incidence of several diseases. Passito of Saracena, a well-appreciated Italian dessert wine, demonstrated an interesting antioxidant activity. Moreover, the aroma profile contributed and defined the chemical markers of the quality of this wine and their quantitative ranges, which are needed to assess the authenticity of local niche production claiming a quality designation.