2.2.2 Influence of storage conditions on kinetics of TSO2 and TAnt degradation

To better evidence the possible effects of the closure system (with or without capsule) and of the storage position (horizontal versus vertical) on the chemical deterioration of wine, the values of the kinetic constants kTSO2 and kTAnt (Table 9) were carried out for bottles stored in brightness conditions. This is because changes in the antioxidant capacity of wine were faster when it was stored under a cool fluorescent lamp (see Figure 3).

#### Figure 3.

Evolution of antioxidant capacity during storage. \*In each couple of data, the values labeled with different superscript letters show statistically significant differences (P < 0.05).

As reported in Table 9, after 12 months from bottling the differences induced by both the closure system and the storage position on the degradation rate of TSO2 as well as TAnt were statistically significant, evidencing that these storage conditions were among those that affect the oxidation rate of the rosé wine. In particular, wine degradation rate was the highest when the rosé wine was stored in glass bottles closed with natural corks without the application of a capsule, regardless of the position (vertical or horizontal) used during storage. Furthermore, independently


\*Al = glass + natural cork without capsule, horizontal storage position, fluorescent lamp. Bl = glass + natural cork without capsule, vertical storage position, fluorescent lamp. Cl = glass + natural cork + capsule, horizontal storage position, fluorescent lamp. Dl = glass + natural cork + capsule, vertical storage position, fluorescent lamp.

#### Table 9.

Kinetic parameters describing the time evolution of TSO2 and TAnt concentration as a function of the storage conditions.

Main Operating Conditions That Can Influence the Evolution of Wines during Long-Term Storage DOI: http://dx.doi.org/10.5772/intechopen.85672

from the closure system, the time evolution of the rosé wine during storage was delayed when bottles were stored in the horizontal position.

#### 2.2.3 Conclusions related to case of study 2

To confirm the convenience in using the rates of TSO2 and total anthocyanin degradation as parameters effectively describing the oxidative evolution during storage of a rosé wine, the kinetic constants kTSO2 and kAnt (Table 9) as well as their combination (kTSO2 + kAnt) were correlated with the wine antioxidant capacity. This was performed over time and for all storage conditions. The Pearson's correlation coefficients are reported in Table 10.


#### Table 10.

exposure reached its maximum when the bottles were closed with cork stoppers and

To better evidence the possible effects of the closure system (with or without capsule) and of the storage position (horizontal versus vertical) on the chemical deterioration of wine, the values of the kinetic constants kTSO2 and kTAnt (Table 9) were carried out for bottles stored in brightness conditions. This is because changes in the antioxidant capacity of wine were faster when it was stored under a cool

As reported in Table 9, after 12 months from bottling the differences induced by both the closure system and the storage position on the degradation rate of TSO2 as well as TAnt were statistically significant, evidencing that these storage conditions were among those that affect the oxidation rate of the rosé wine. In particular, wine degradation rate was the highest when the rosé wine was stored in glass bottles closed with natural corks without the application of a capsule, regardless of the position (vertical or horizontal) used during storage. Furthermore, independently

r

Al 2.54 0.06 133.8 0.4 0.98 2.99 0.07 87.3 0.01 0.81 Bl 2.66 0.06 135.7 0.4 0.94 3.31 0.07 87.0 0.01 0.91 Cl 2.03 0.06 132.5 0.4 0.65 2.39 0.07 87.5 0.01 0.85 Dl 2.44 0.06 130.0 0.4 0.88 2.62 0.07 86.5 0.01 0.85 \*Al = glass + natural cork without capsule, horizontal storage position, fluorescent lamp. Bl = glass + natural cork without capsule, vertical storage position, fluorescent lamp. Cl = glass + natural cork + capsule, horizontal storage position, fluorescent lamp. Dl = glass + natural cork + capsule, vertical storage position, fluorescent lamp.

Kinetic parameters describing the time evolution of TSO2 and TAnt concentration as a function of the storage

<sup>2</sup> kTant (months<sup>1</sup>

) <sup>10</sup><sup>2</sup>

[TAnt]t=0 c.i. (mg/L)

r 2

Evolution of antioxidant capacity during storage. \*In each couple of data, the values labeled with different

[TSO2]t=0 c.i. (mg/L)

superscript letters show statistically significant differences (P < 0.05).

) <sup>10</sup><sup>2</sup>

2.2.2 Influence of storage conditions on kinetics of TSO2 and TAnt degradation

stored in a vertical position.

Advances in Grape and Wine Biotechnology

fluorescent lamp (see Figure 3).

Figure 3.

Table 9.

conditions.

220

Sample\* kTSO2 c.i. (months<sup>1</sup>

Correlation matrix relating the kinetic constant describing TSO2 (kTSO2), total anthocyanins (kAnt), degradation, and a combination of them (kTSO2 + kAnt) to wine antioxidant capacity (storage time = 12 months).

The results (Table 10) highlight that all the degradation kinetic constants were strictly inversely correlated with the antioxidant capacity of wine.

Notwithstanding kTAnt did not result a good index for monitoring the chemical evolution of a red wine stored in the same conditions used in this research study [27], the correlation between kTAnt and the antioxidant capacity showed by the rosé wine was higher than that determined when kTSO2 was considered.

Furthermore, kTSO2 confirmed to be a suitable index for the description of the oxidative evolution of different wines, regardless of the wine style (i.e., white, rosé, full-bodied red) and the operating conditions (i.e., packaging, storage or tasting conditions), according to what is reported in [59–61].

It can be concluded that also antioxidant capacity could be considered a useful index to describe the chemical evolution of the rosé wine under investigation, when correlated with the total anthocyanin decay rate constant (kTAnt) and, at a lower extent, with the TSO2 decay rate constant (kTSO2).
