The efficacy of chitosan and sulfites in inhibiting the oxidation of (+)-catechin in aerated model white wines has been compared by monitoring the browning development and the generation of oxidized phenolic compounds. In addition, the protecting effects of these two additives toward the oxidative decay of varietal thiols were investigated. Chitosan effectively contrasted the browning onset in model solutions all along the entire duration of the experimentation. Color development was limited and comparable in both the sulfite and chitosan added samples. Thanks to its polyelectrolyte behavior, chitosan adsorbed up to 80% of the more hydrophilic oxidized phenolic species and chelated 70 and 30% of Fe and Cu added to the solutions, respectively. Thiol oxidation was significantly lowered by chitosan, suggesting that this additive could contribute to maintain the varietal character of wines coming from aromatic grapes and vinified with reduced sulfite amounts.

Fabio Chinnici, Nadia Natali, Claudio Riponi (2014). Efficacy of chitosan in inhibiting the oxidation of (+)-catechin in white wine model solutions. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 62, 9868-9875 [10.1021/jf5025664].

Efficacy of chitosan in inhibiting the oxidation of (+)-catechin in white wine model solutions

CHINNICI, FABIO;NATALI, NADIA;RIPONI, CLAUDIO
2014

Abstract

The efficacy of chitosan and sulfites in inhibiting the oxidation of (+)-catechin in aerated model white wines has been compared by monitoring the browning development and the generation of oxidized phenolic compounds. In addition, the protecting effects of these two additives toward the oxidative decay of varietal thiols were investigated. Chitosan effectively contrasted the browning onset in model solutions all along the entire duration of the experimentation. Color development was limited and comparable in both the sulfite and chitosan added samples. Thanks to its polyelectrolyte behavior, chitosan adsorbed up to 80% of the more hydrophilic oxidized phenolic species and chelated 70 and 30% of Fe and Cu added to the solutions, respectively. Thiol oxidation was significantly lowered by chitosan, suggesting that this additive could contribute to maintain the varietal character of wines coming from aromatic grapes and vinified with reduced sulfite amounts.
2014
Fabio Chinnici, Nadia Natali, Claudio Riponi (2014). Efficacy of chitosan in inhibiting the oxidation of (+)-catechin in white wine model solutions. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 62, 9868-9875 [10.1021/jf5025664].
Fabio Chinnici; Nadia Natali; Claudio Riponi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/373595
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