Oxidation treatments affecting Sauvignon blanc wine sensory and chemical composition
作者： Carien Coetzee
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摘要: Thesis (PhD(Agric)) – Stellenbosch University, 2014.%%%%ENGLISH ABSTRACT: This study focussed on the effect of oxygen chemical and sensory evolution Sauvignon blanc wine under controlled oxidation conditions. The sensorial interactive effects between blanc varietal aroma compounds that typically arise during white wines were also investigated. In first research chapter blanc impact with aldehydes originating from investigated. Four compounds, 3‐ mercaptohexan‐1‐ol (3MH), 3‐isobutyl‐2‐methoxypyrazine (IBMP), 3‐(methylthio)‐propionaldehyde (methional) phenylacetaldehyde added together in a model wine medium at varying concentrations. concentrations chosen according to those reported literature occur in Sauvignon wines. these profiled using trained sensory panel. Compounds individually results showed change comcpound concentration not only led intensity ratings but also some cases the descriptor. All four same sample complicated effects. Data statistically analysed relatively novel techniques such as statistical networks allowed deeper insights into the interactions involved. Various observations made contribution 3MH the ‘green’ character wine, potent suppressing abilities methional IBMP the additive contributing ‘cooked’ sample. In second repetitive fresh fruity style Sauvignon blanc was Results progress aromatic non‐aromatic compounds an oxidative aging period. A large range analyses conducted together with extensive profiling. decrease volatile thiols responsible for the nuances increase oxidation‐related acetaldehyde, the course oxidation. Sensory profiling The wine evolved slight then developed extreme oxidative characteristics. Control samples (no added) which could indicate formation reductive Conversely, received a single dose did develop this flavour perceived be more than the samples. colour monitored spectrophotometer as well panel suggest before disappearance of pleasant aroma. advantages disadvantages exposure type style are discussed well the…
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