Production of alcohol by fermentationIntroduction/Purpose: Yeasts are microbes that produce carbon dioxide and alcohol from sugars. This is called fermentation. In this assignment, I will try two methods of making alcohol from fruit juice (apple juice). “Free” yeast cells are used; the other uses “immobilized” yeast cells. The process of using microorganisms to make useful products from an energy source is called fermentation. This operation is carried out in large tanks (open or closed) called fermenters. Microorganisms are cheap and easy to culture; they can be used to make antibiotics (penicillin) and useful proteins (insulin). It can also be used for foods such as Quorn. Quorn is also called single cell protein (SCP), for example mushrooms are grown and harvested in fermenters to make Quorn which is then used to prepare a range of vegetarian meals and SEP made from mushrooms is called Mycoprotein. In order for me to grow my microorganism, these basic factors must be controlled: 1. Temperature2. Ph (potential hydrogen)3. Nutrients/foods (glucose)4. Gas (oxygen)5. AgitationThe final product must then be sterilized to prevent other microorganisms from infecting/spoiling the product, as the solution is quite delicate and spoils easily. Equipment/Apparatus:* Yeast culture* Apple juice* Chloride solution of calcium* Sodium alginate solution* Distilled Water* Lime water* Disinfectant* 2 conical bottles (250 cm³)* 1 bung and discharge tube* 2 conical bottles (100 cm³)* 250 cm³...... middle of paper......this way they are able to collect oxygen. My results turned out to be slightly incorrect because the growth of the yeast population was slightly off because the yeast cells had not received the correct factors that the yeast cells need to complete fermentation. One way to improve my investigation might be to look for information on fermentation. on the internet and look in depth at exactly how yeast cells work when they ferment, I could also have tried changing methods or just using different methods, this would help me identify which method gives me the best results. most accurate and best among all methods. I could expand my research by studying how yeast cells work, what yeast cells are used for and how they are used in industry, in the laboratory and elsewhere..