Feermentation: The Process And Misconceptions Of Fermentation

Improved Essays
Fermentation has been used by mankind for centuries to make useful products such as cheese, breads, yogurts and alcohol beverages. During fermentation, some strains of yeast decompose sugars to derive energy, and in the process they produce ethanol as a waste product. When bread dough is being made, yeast is added to make dough rise. This occurs because the yeast ferments sugar releasing carbon dioxide which causes the dough to rise and creates holes in the bread. This carbon dioxide released gives a boiling appearance when yeast acts on extracts of fruits or malted grains thus giving the process name fermentation (Thiemann, 2009, Whittaker et al. 1999)
Definition: Fermentation has been defined in different ways:
• Biochemist’s Definition:
“Oxidative or reductive process in which microorganisms grow on a certain substance (or carbon source) and convert it into some sort of useful product using particular enzymes which may be a primary or
…show more content…
 large products are not only broken down but are also formed.
 Fermentation not only takes place in anaerobic conditions but also occurs in aerobic conditions.
 Not all fermentation processes produce alcohol and emit CO2.
Types of Fermentation: There are different types of fermentation processes depending on the method used like Batch Fed Batch and Continuous Fermentation or on the state of medium used like Submerged,Liquid and Solid State Fermentation or on the basis of product like Alcoholic and Lactic acid Fermentation.

Range of Fermentation Processes
There is a wide range of fermentation processes. For convenience commercial fermentation products have been classified into five major groups. This classification is based on the basis of the product formed as a result.

Production of Microbial Cells or

Related Documents

  • Improved Essays

    Their simplicity, ease, and specificity makes biochemical tests critical to the process of identifying bacteria…

    • 1060 Words
    • 5 Pages
    Improved Essays
  • Improved Essays

    Step 1. Make Drosophila culture medium First, to prepare a culture medium, four plastic vials were obtained and labeled with numbers 1 – 4. In each of the four vials, two teaspoons of medium mixture were added.…

    • 731 Words
    • 3 Pages
    Improved Essays
  • Great Essays

    M. Luteus Lab Report

    • 715 Words
    • 3 Pages

    Several tests were accomplished technically and carefully to identify the unknown # 230 to be M.luteus bacteria. Most of the observed results do match the expected ones, except two tests. The observed results for glucose fermentation and oxidase test did not match the expected results. The expected result for fermentation of glucose test was negative while the observed result was positive.…

    • 715 Words
    • 3 Pages
    Great Essays
  • Improved Essays

    A total of four microorganisms were isolated from the sample brought back from Mars. To identify the microorganisms which were isolated from the sample brought back from Mars, an rDNA sequence analysis was required. Every sequence had an S_ab score of 1.000 meaning the sequence is identical to the microorganism that it was matched to. Before gathering phenotypic results, we gathered phylogenetic data for the four microorganisms which includes Micrococcus luteus, Citrobacter freundii, Hafnia alvei, and Staphylococcus epidermidis. Micrococcus luteus is a gram positive, coccus shaped microorganism that is nonmotile and unable to grow on glucose minimal media or simmons citrate agar (Kocur, 1972;).…

    • 963 Words
    • 4 Pages
    Improved Essays
  • Improved Essays

    Unknown Microorganism

    • 1283 Words
    • 6 Pages

    Purpose: To identify an unknown microorganism by performing a series of biochemical tests on a pure bacterial culture. Materials and Methods: Carbohydrate Utilization: Materials: - Phenol red lactose Broth - Phenol Red Sucrose Broth - Unknown organism # 40 - Inoculating tool Procedure: Phenol red lactose and Phenol Sucrose were cultures used to identify fermentation of carbohydrates for the unknown organism #40. Phenol red is a ph. indicator as the inverted Durham tube indicates gas production. The unknown organism was inoculated into each phenol red broth with either sucrose or lactose.…

    • 1283 Words
    • 6 Pages
    Improved Essays
  • Improved Essays

    The aim of this experiment is to identify and classify of an unknown bacterial isolate. Morphological and Biological test were preformed to identifiy the isolates characteristics. The following characteristics were tested: gram-stain, motility, morphology, hemolysis, lactose fermetation, mannitol fermentation, osmotolerance, aesculin hydrolysis, starch hydrolysis, gelatine hydrolysis, amino acid decarboxylation, lipid hydrolysis, lactose fermetation, casein digestion, catalase enzyme production, cytochrome oxidase enzyme production, citrate utilization, tryptophan hydrolysis, urease enzyme production, hydrogen sulphaide production, nitrate reduction, carbohydrate fermentation, glucose utilization and non-acidic end product from glucose fermetation.…

    • 387 Words
    • 2 Pages
    Improved Essays
  • Superior Essays

    Unknown Microorganism

    • 1849 Words
    • 8 Pages

    The purpose of performing physiological tests is to figure out certain characteristics of microorganisms or to reach a conclusion on what an unknown microorganism is. It can be also used to determine what is needed for bacteria to be cultured in or on certain media. Culture media can either be liquid or solid, and they can be used to identify certain characteristics of different bacterial species. This is indicated by the growth or lack of growth in or on certain media. Solid media can also be used to isolate organisms and provide a means to observe their morphology (Wiley 55).…

    • 1849 Words
    • 8 Pages
    Superior Essays
  • Improved Essays

    This used to be how people preserved food before cooling appliances and sealed cans were invented/available. About 33% of food is still produced by fermentation. Every culture ferments food one way or another. One example of culture specific fermentation that is still quite common is the pit fermentation of cabbage in China to make kimchi. Animals such as squirrels, birds, and even monkeys bury or sour foods such as nuts, seeds, flowers, and fruits which causes them to ferment.…

    • 668 Words
    • 3 Pages
    Improved Essays
  • Improved Essays

    The hypothesis that was tested in this experiment was that both strains of brewer’s yeast will grow better in fermentable sugars (sucrose) than in non-fermentable sugars (glycerol) because it is a better carbon source. The prediction for this experiment is that the fermentable sugar (sucrose) will cause the TRY 143 flo ↑ yeast to increase growth the greatest and the TRY 140 flo ↓ to increase in growth less significant than the TRY 143 flo ↑. This prediction is based upon the fact that TRY 143 ↑ has more gene expression than TRY 140 flo ↓ and because of this it is more adhesive to itself. For this experiment, the Sucrose should cause the diameter of TRY 143 flow ↑ to have the most growth compared to the other strain of…

    • 1398 Words
    • 6 Pages
    Improved Essays
  • Improved Essays

    The lab instructor issued out a test tube labeled with letter ‘I’, which consisted of two unknown bacteria, Gram-positive or Gram-negative that were streaked from a pure culture. Sterile techniques were followed while performing precise instructions as stated in the referenced Laboratory Manual. Example 1: The first procedure performed was done by isolating a pure culture from the mixture onto a solid Trypticase soy agar (TSA) media. Sterile technique was done by flaming the loop until it turned red to ensure that there were no current bacteria on the loop avoiding contamination followed by rapidly flaming the neck of the test tube to prevent the entry and contamination of unwanted microbes.…

    • 416 Words
    • 2 Pages
    Improved Essays
  • Improved Essays

    Identification of unknown organisms is useful in a wide variety of settings; from clinical diagnostics to environmental monitoring (1). Species of bacteria can differ fundamentally in aspects ranging from morphology to metabolism. Exploiting these differences can allow for identification of unknown organisms. Gross morphological characterizations are crude, and better replaced by more accurate and specific tests. At a fundamental level, tests such as the Gram stain divide bacteria in to two broad categories based on the characteristics of their cell wall (2).…

    • 1018 Words
    • 4 Pages
    Improved Essays
  • Great Essays

    Essay On Bacteria Lab Report

    • 2361 Words
    • 10 Pages

    Conclusion: The experiment has showed how some bacteria have become extremely versatile and able to live in many environments and how other have not changed much over the course of time. It has showed how use of sugar, growth based on enzymes, and ability to ferment as well as motility can help us identify multiple bacteria and distinguish them from each other. This will be useful to come in the Isolating and Identifying Bacteria project since we have already isolated and observed the bacteria the information learned in this lab gives us ways to test and observe our bacterial cultures so we can compare results back to our data and attempt to properly identify them. Real world implications of this lab show how difficult it is to obtain growth in a lab at times and how tedious it can be, but also provides a database of sorts to look back upon to help study bacteria and identify which ones cause illness, where they can be found, how to test for them to prevent illness and contamination and possible ways to fight them knowing what they need to survive and what defenses and attributes they…

    • 2361 Words
    • 10 Pages
    Great Essays
  • Improved Essays

    Yeast Fermentation Lab

    • 1039 Words
    • 5 Pages

    Fermentation is the process of anaerobic respiration of yeasts in the absent of oxygen. The enzymes in the yeast assist the breaking down of the glucose and released alcohol and carbon dioxide. The producing of carbon dioxide means fermentation is taking place. It can be affected by such as temperature and pH level. Some organisms use fermentation to produce ATP without oxygen.…

    • 1039 Words
    • 5 Pages
    Improved Essays
  • Superior Essays

    to explain the differences among the differences of the rate of respiration of the yeast. MATERIALS AND METHODS The Smith Fermentation Tube was used to determine the effect of the nature of substance on rate of cellular respiration of yeast. Six fermentation tubes were prepared.…

    • 757 Words
    • 4 Pages
    Superior Essays
  • Improved Essays

    Milk Lab Report

    • 1015 Words
    • 5 Pages

    The aims of this experiment were to investigate the effect of milk solid content and the varying temperatures of heat pretreatment on yoghurt quality to determine the difference in pH and titratable acidity of fermented milk. In order to carry out this experiment and gain accurate results three variations were tested: yoghurt produced with whole milk pasteurised at 72 °C for 15 seconds, 85 °C for 15 minutes and then whole milk with added 5 % milk solids also heated at 85 °C for 15 minutes, after this pretreatment stage all variables were fermented for 120 min at 44°C. Table 1 shows the varying results of whole milk and whole milk with 5% SMP; in regards to °Brix, pH and titratable acidity, as shown in figure 1 indicates that whole milk with added 5% SMP treatment excels in all three testing components especially with °Brix. The °Brix score for whole milk 5% SMP sample result is 4.56° higher than the °Brix measurement for the whole milk sample.…

    • 1015 Words
    • 5 Pages
    Improved Essays