Yeast and Fermentation

Topics: Yeast, Brewing, Carbon dioxide Pages: 7 (1907 words) Published: January 26, 2012
Dinah Gibson

Ms. Lunsford

Honors Chemistry



Yeast is widely used for making bread, beer, and wine. People all over the world drink and eat those products. This projects looks at which fruit juice with a higher percentage of sugar will produce more fermentation. The original purpose of this experiment was to determine the amount of fermentation of 3 different fruit juices after adding a certain amount of yeast. By measuring the type of fruit juice (independent variable) the amount of fermentation as shown by the reduction of sugar (dependent variable).My hypothesis my hypothesis is that the fruit juice with a higher percentage of sugar will produce more fermentation. The experimental results supported my hypothesis by showing that the results indicate that this hypothesis should be accepted, because the orange juice, which had the highest sugar content, produced the most fermentation. Because of the results of this experiment, I wonder if using more yeast would produce more fermentation or if using another type of juice with two of them mixed together like the cranberry-grape juice, would produce less fermentation.

The Effect of Yeast on Different Fruit Juices

Question: what’s the effect of different juice on yeast?

Variable: The manipulated variable was the type of fruit juice. The responding variable was the amount of fermentation as shown by the reduction of sugar.

Hypothesis: That the fruit juice with a higher percentage of sugar will produce more fermentation.

Research Report

Fermentation has been around for a very long time. People have used it for making bread, beer, wine and other products. There have been scientists and chemists who have discovered new things about fermentation. There are many types of fermentation including fermentation of fruit juices, malted grain and other sugars. Fermentation

Fermentation is a chemical process that breaks down organic matter. Microbes like bacteria carry out this process. Mold and yeast act upon molasses and mineral salts to create penicillin. Yeast breaks down sugar taken from malted grain and turns it into ethyl alcohol and carbon dioxide gas to make beer. French Scientist Louis Pasteur discovered that microbes ferment beer and wine. Fermentation is also used to make bread, cheese and yogurt. Sometimes fermentation can be unhealthy; for example milk that has been fermented turns sour. There are 1900 other types of fermentation found. Fermentation is also used to make certain drugs, vitamins and some chemicals.

Fungi are organisms that lack chlorophyll, the green matter that plants use to make their food. Fungi cannot make their own food, instead they absorb it from around them. According to mycologists there are over 100,000 species of fungi. Yeasts and other one-celled fungi are too small to be seen without a microscope. Most types can be seen with the unaided eye. Some of the most common fungi are mildews, molds, mushrooms and plant rusts. Fungi break down complex animal and plant materials into simple compounds. This process of decomposition enriches the soil and makes essential substances available to pants in a form they can use. Through decomposition, fungi also return carbon dioxide to the atmosphere, where green plants reuse it to make food. Yeast

Yeast is a single celled organism. Yeast is a fungus that exists almost everywhere in nature, including the air. Bakers use yeast to make bread rise. Yeast is used for making beer, wine, and other alcoholic beverages. It consists of masses of microscopic organisms. There are 600 species of yeast, but only a few are used commercially. Yeast grows fast, and it grows best in sugar. Yeast cells reproduce by fission and budding. Bud swelling forms on a yeast cell wall, and then it breaks off to form a new single cell. In the early times yeast was used for bread, beer, wine and other products. In the 1600’s Dutch Scientist Anton Van...

Bibliography: "Fermentation." Utah State University: Intermountain Herbarium. Web. 26 Oct. 2011.
"Yeast Fermentation." NEWTON, Ask a Scientist at Argonne National Labs! Web. 27 Oct. 2011. <>.
Katz, Sandor Ellix. Wild Fermentation: the Flavor, Nutrition, and Craft of Live-culture Foods. White River Junction, VT: Chelsea Green Pub., 2003. Print.
I would like to thank the following people. Without their help, my project would not have been possible:
My mom for getting all of my materials needed and helping me with the broad design.
My Honors Chemistry Teacher (Ms.Lunsfords) for helping me understand the concept of fermentation.
My Aunt for getting me a Brix Meter from her job.
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