Practical investigations
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I am doing my A2 practical investigation on wine. Can you tell me the main chemical reactions which cause white wine to brown as it oxidises? 260308
Igloo writes ...There is no single reaction which is responsible for the browning. Processes occurring which contribute to the browning include the oxidation of complex phenols to quinones, and the creation of more complex tannins within the wine. Such reactions are extremely complex and there is no easy equation to represent any of them.
If you want to know more, try using Google with search phrases such as “phenols to quinones” or “tannins”, and you may come up with some useful information.
Risk assessment
Before attempting any practical work based on the advice and suggestions on this website, you must do the following. Identify any hazards, assess the risks from these hazards, and then decide appropriate control measures to reduce the risks. You must have these approved by those in authority in your school or college laboratory. Do not rely on what is said on this website.
For further guidance see our tutorial on Risk Assessment.
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updated: 28 March 2008
