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T

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Jossie Tan

on 5 November 2014

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Transcript of T

The Chemistry of Wine Making
by Josephine Priscilla
What is Wine?
Alcoholic beverage made from fermented grapes or other fruits
What's inside the wine?
Harvesting
Sugar
Acid
Phenol
Aroma compounds
Crushing & Destemming
The grapes are removed from the stems and gently crush to break the skin. Sulfur dioxide is added in this stage to prevent oxidation and inhibit microbial activity

*Enzymes may also be added to break down the cell walls and aid the release of juice
Pressing
The juice extraction process depends on the type of wines to be used, but always involves
squeezing the berries. After pressing the juice is allowed to stand to separate the solids.
If necessary the juice may be clarified by filtration or centrifugation.
Fermentation
The juice is innoculated with live yeast, which then carries out the fermentation reaction :

C6H12O6 → 2C2H5OH + 2CO2
Purification
Unwanted solids, salts and microorganisms are removed through a variety of physical processes
Biochemical reaction of fermentation
79%
water
20%
carbohydrates
1%
organic acids and trace amounts of organic acids, phenolics, vitamins, minerals and nitrogenous compounds
Aim :
to pick the grapes at their optimum composition
The Process
Advantages and Disadvantages of Drinking Wine
Advantages :
Antioxidants
Prevent heart attack
Skin care
Help the digestion
Disadvantages
Headache
It slows the brain activity
Cause a serious disease (e.g. destruction of liver, high blood pressure, obesity)
The right dose to drink wine
12 oz. of regular beer
or
5 oz. of wine
or
1,5 oz. (a shot) of 80 proof liquor
References
Dairy Science Food Technology. (2012). The Science and Technology of Wine Making. Retrieved from
http://www.dairyscience.info/index.php/science-and-technology-of-wine/124-the-science- and-technology-of-wine-making.html
Grain and Grape. (2012). Red Wine Making. Retrieved from
http://www.grainandgrape.com.au/red-wine-making
The Human Touch of Chemistry. Wine Making A Chemical Process. Retrieved from
http://humantouchofchemistry.com/wine-making-a-chemical-process.htm
The Science Behind Food. The Red Wine Benefits and Disadvantages. Retrieved from
http://foodnutrients.wordpress.com/2012/11/13/the-red-wine-benefits-and-disadvantages/
Time. (2009). When does social drinking become at risk drinking? Retrieved from
http://healthland.time.com/2009/08/20/when-does-social-drinking-become-at-risk-drinking/
Thank You for your attention!
Conclusion
- Wine is an alcoholic beverage that made from fruits especially grapes
- Wine contains water, carbs and other organic acids
- There are 5 processes of wine making, harvesting, crushing, pressing, fermenting and purification
Full transcript