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Results of experimentation of wines without added sulfites* produced with the Wave Winemaker ® presented at Vinitaly in 2018

The experiment was conducted and coordinated by Prof. Esti Marco of theUniversity of TusciaDepartment of Agricultural and Forestry Sciences DAFNE – Viterbo

 

RIESLING VINIFIED ON AIR WITHOUT ADDED SULFITES*

Grape: Rhine Riesling

Harvest date: September 15, 2017

 

Bottling
Ethanol (% v/v) 13.3
pH 3.10
Acidity (g/L) 6.4
SO2 free (mg/L) 9
SO2 total (mg/L) 13
Acetic acid (g/L) 0.23
Acetaldehyde (mg/L) 5
Polyphenols (mg/L) 73
Residual sugars (mg/L) 240

 


 

ROSÉ VINIFIED ON AIR WITHOUT ADDED SULFITES*

Grape: Rhine Riesling

Harvest date: September 15, 2017

 

Bottling
Ethanol (% v/v) 13.2
pH 3.2
Acidity (g/L) 6.3
SO2 free (mg/L) 10
SO2 total (mg/L) 15
Acetic acid (g/L) 0.16
Acetaldehyde (mg/L) 4
Polyphenols (mg/L) 77
Total anthocyanins (mg/L) 2
Residual sugars (mg/L) 200
Dye intensity 0.12
Shades 1.14

 

 



 

Continuous measurement of oxygen* (ppb), in Onda® tank, during vinification and aging of white wine from Riesling grapes without added sulfites*.

 

Using Onda® technology, a wine was produced from Riesling grapes without added sulfites (No SO2) with chemical-physical and organoleptic parameters similar to those of control wine (SO2).

Using speculas placed at different heights from the bottom of the Onda® tank, dissolved oxygen was continuously measured and dosage adjusted in the must and wine during alcoholic fermentation and aging on lees.

It was found that:

  • In the first three days after the start of alcoholic fermentation, the oxygen present was metabolized by the yeasts throughout the mass homogeneously;
  • Comparison of oxygen concentrations at different heights shows no significant variations, guaranteed by the excellent saturating capacity of the nozzle placed in the headspace;
  • During alcoholic fermentation, the regulated additions of oxygen (5 mg/l), at about 3 and 9 days after the start of fermentation, designed to promote biosynthesis of yeast survival factors, are very evident;
  • In aging, in the thesis without added sulfites (No SO2), there was a slightly higher dissolved oxygen content than in the control thesis (SO2).

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