Catalase test ppt

This test demonstrate the presence of catalase, an enzyme that catalyses the release of oxygen from hydrogen peroxide H 2 O 2. It is used to differentiate those bacteria that produces an enzyme catalase, such as staphylococcifrom non-catalase producing bacteria such as streptococci. The enzyme catalase mediates the breakdown of hydrogen peroxide into oxygen and water. The presence of the enzyme in a bacterial isolate is evident when a small inoculum is introduced into hydrogen peroxide, and the rapid elaboration of oxygen bubbles occurs.

The lack of catalase is evident by a lack of or weak bubble production. The culture should not be more than 24 hours old. Bacteria thereby protect themselves from the lethal effect of Hydrogen peroxide which is accumulated as an end product of aerobic carbohydrate metabolism. As per Koneman, the negative control to be used for catalase test is of streptococcus species. You have stated Enterococcus faecalis. Please quote a reference for the same.

Regards, Dr. I am finding very difficult to differentiate Rhodococcus sp, from Roseomonas and Methylo bacterium. Can you help? Save my name and email in this browser for the next time I comment. Principle of Catalase Test The enzyme catalase mediates the breakdown of hydrogen peroxide into oxygen and water. Also valuable in differentiating aerobic and obligate anaerobic bacteria. Semiquantitative catalase test is used for the identification of Mycobacterium tuberculosis.

It is used to differentiate aerotolerant strains of Clostridiumwhich are catalase negative, from Bacillus species, which are positive. Catalase test can be used as an aid to the identification of Enterobacteriaceae. Using a sterile wooden stick or a glass rod, take several colonies of the 18 to 24 hours test organism and immerse in the hydrogen peroxide solution.

Observe for immediate bubbling. Slide Method Use a loop or sterile wooden stick to transfer a small amount of colony growth in the surface of a clean, dry glass slide.

Observe for the evolution of oxygen bubbles. Negative: No or very few bubbles produced. Red Blood cells contain catalase and their presence will give a false positive test. Culture should be 18 to 24 hours old. Hydrogen peroxide must be fresh as it is very unstable.Catalase is an enzyme, which is produced by microorganisms that live in oxygenated environments to neutralize toxic forms of oxygen metabolites; H 2 O 2.

The catalase enzyme neutralizes the bactericidal effects of hydrogen peroxide and protects them. Anaerobes generally lack the catalase enzyme. Catalase mediates the breakdown of hydrogen peroxide H 2 O 2 into oxygen and water. The lack of catalase is evident by a lack of or weak bubble production.

Catalase-positive bacteria include strict aerobes as well as facultative anaerobes. They all have the ability to respire using oxygen as a terminal electron acceptor. Catalase-negative bacteria may be anaerobes, or they may be facultative anaerobes that only ferment and do not respire using oxygen as a terminal electron acceptor ie. The hydrogen peroxide reagent must be tested with positive and negative control organisms each day or immediately before unknown bacteria are tested.

Positive control: Staphylococcus aureus B. Negative control: Streptococcus species. Check catalase test protocol developed by ASM. Catalase Positive and Catalase Negative Reactions Catalase Test Results: Catalase positive reaction: Evident by immediate effervescence bubble formation Catalase negative reaction: No bubble formation no catalase enzyme to hydrolyze the hydrogen peroxide You can perform Catalase Test online here. This post was most recently updated on May 10th, Indole test is used to determine the ability of an organism to split amino acid tryptophan to form the compound indole.

Tryptophan is hydrolysed by tryptophanase to […]. This post was most recently updated on March 25th, The bile sodium deoxycholate solubility test distinguishes Streptococcus pneumoniae from all other alpha-hemolytic streptococci. Streptococcus pneumoniae is bile soluble whereas all other alpha-hemolytic streptococci are bile […].

This post was most recently updated on April 20th, Streptococcus pneumoniae strains are sensitive to the chemical optochin ethylhydrocupreine hydrochloride. Optochin sensitivity allows for the presumptive identification of alpha-hemolytic streptococci as S. Ravi Prasad ji To differentiate the genus Streptococcus or Staphylococcusyou can perform catalase test.

Streptoccus spp is catalase Negative and Staphylococcus is catalase positive. Sir i just need to know is it a journal or newspaper article because i have to write a report on it and i need a reference.

Something to be careful of when doing Catalse is aerosolization of the organism…….

catalase test ppt

Very hard to say you exact reason on the basis of information you have provided. Please try again with fresh culture with both tube and slide test; adhering with exact protocol and share your results. Tamara, sounds like you did not have a lot of growth in the tube and the hydrogen peroxide could have been diluted in the liquid media. So you could not drop the hydrogen peroxide directly on the plate.

If you do the slide test make sure you do not carry over any agar blood agar, etc to avoid a false positive. Thank you for your comment. Catalase test: principle, uses, procedure and results.After you enable Flash, refresh this page and the presentation should play.

Get the plugin now. Toggle navigation. Help Preferences Sign up Log in. To view this presentation, you'll need to allow Flash. Click to allow Flash After you enable Flash, refresh this page and the presentation should play. View by Category Toggle navigation. Products Sold on our sister site CrystalGraphics. Tags: catalase lab hydrogen peroxide.

Latest Highest Rated. Discuss what a normal reaction is What does the bubbling represent? Whether your application is business, how-to, education, medicine, school, church, sales, marketing, online training or just for fun, PowerShow. And, best of all, most of its cool features are free and easy to use.

Bacterial Identification Tests: Catalase Test

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Our new CrystalGraphics Chart and Diagram Slides for PowerPoint is a collection of over impressively designed data-driven chart and editable diagram s guaranteed to impress any audience. They are all artistically enhanced with visually stunning color, shadow and lighting effects. Many of them are also animated. PowerPoint PPT presentation free to view. Lab 1: Diffusion Lab Exercise - Beta hemolysis blood agar around bacterial Staphylococcus epidermidis.

Enterococcus faecalis.Coagulase is an enzyme-like protein and causes plasma to clot by converting fibrinogen to fibrin.

catalase test ppt

Staphylococcus aureus produces two forms of coagulase: bound and free. Bound coagulase clumping factor is bound to the bacterial cell wall and reacts directly with fibrinogen.

This results in an alternation of fibrinogen so that it precipitates on the staphylococcal cell, causing the cells to clump when a bacterial suspension is mixed with plasma. This complex in turn reacts with fibrinogen to produce the fibrin clot. Because human plasma may contain inhibitor,which neutralize the coagulase enzyme and clumping is not and false positive result maybe detected.

Dear Sagar In most texts they recommend to dilute the plasma up to 5 times,so why in your procedure,it is recommended to 10 times dilution?

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Save my name and email in this browser for the next time I comment. Principle of Coagulase Test Coagulase is an enzyme-like protein and causes plasma to clot by converting fibrinogen to fibrin. Procedure and Types of Coagulase Test Slide Test to detect bound coagulase Place a drop of physiological saline on each end of a slide, or on two separate slides.

With the loop, straight wire or wodden stick, emulsify a portion of the isolated colony in each drops to make two thick suspensions. Add a drop of human or rabbit plasma to one of the suspensions, and mix gently. Look for clumping of the organisms within 10 seconds. No plasma is added to the second suspension to differentiate any granular appearance of the organism from true coagulase clumping. Test is hour broth culture, Positive control is hr S. Pipette 0. Add 5 drops 0.

After mixing, incubate the three tubes at Degree Celsius. Examine for clotting after 1 hours. If no clotting has occurred, examine at 30 minutes intervals for up to 6 hours.

All the negative slide test must be confirmed using the tube test.

Catalase Test- Principle, Uses, Procedure, Result Interpretation with Precautions

During slide test, there may be chance to false positive results in case of citrate utilizing bacteria Enterococcus and Pseudomonas.

In this case also, tube test should be performed and confirmed. Why I must use rabbit plasma.

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Not human plasma in this test?? Tube coagulase test can demostrate free coagulase or both bond and free coagulase?

Regards Reply.Copy embed code:.

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Automatically changes to Flash or non-Flash embed. WordPress Embed Customize Embed. URL: Copy. Presentation Description No description available. Biochemical tests for identification of bacteria: 1 Biochemical tests for identification of bacteria Dr. Subculture into a tube of broth if large number of test media have to be inoculated. Incubate for hours or overnight. Control for test Test for sterility - incubate one or two uninoculated tubes with the test medium. Test for performance of medium- Known positive and negative culture along with the test.

Bile solubility test: 3 Bile solubility test Principle: The bile salt, Sod deoxycholate dissolves the S. Clearing of the turbidity Usually done to differentiate S. Methods: 1. Slide method 2. Tube method PowerPoint Presentation: 6 1.

Slide method: A drop of 3 percent hydrogen peroxide is put on a slide in a petri dish and the bacteria is emulsified in the drop. The dish is immediately covered to prevent contamination from active bubbling.

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Two types of coagulase: 1. Free coagulase: requires activation by coagulase reacting factor in the plasma. Detected by clotting in the test tube. Can be detected in slide method also. Add 0. Incubate trhe tubes at C and examine for clotting after 1 hr, if -ve, check after 3hrs; if -ve again check after overnight incubation at RT.Cells contain a large number of antioxidants to prevent or repair the damage caused by ROS, as well as to regulate redox-sensitive signaling pathways General protocols are described to measure the antioxidant enzyme activity of superoxide dismutase SODcatalase, and glutathione peroxidase.

The SODs convert superoxide radical into hydrogen peroxide and molecular oxygen, while the catalase and peroxidases convert hydrogen peroxide into water. In this way, two toxic species, superoxide radical and hydrogen peroxide, are converted to the harmless product water. Western blots, activity gels and activity assays are various methods used to determine protein and activity in both cells and tissue depending on the amount of protein needed for each assay.

Other techniques including immunohistochemistry and immunogold can further evaluate the levels of the various antioxidant enzymes in tissue and cells. In general, these assays require 24 to 48 hours to complete.

Reactive oxygen species ROS are produced in many aerobic cellular metabolic processes.

CATALASE LAB - PowerPoint PPT Presentation

They include, but are not limited to, species such as superoxide and hydrogen peroxide which react with various intracellular targets, including lipids, proteins, and DNA 1. Although ROS are generated during normal aerobic metabolism, the biological effects of ROS on these intracellular targets are dependent on their concentration and increased levels of these species are present during oxidative stress.

Increased levels of ROS are cytotoxic, while lower levels are necessary for the regulation of several key physiological mechanisms including cell differentiation 2apoptosis 3cell proliferation 4 and regulation of redox-sensitive signal transduction pathways 5. However, increased levels can also result in ROS-induced damage including cell death, mutations, chromosomal aberrations, and carcinogenesis 1.

Cells contain a large number of antioxidants to prevent or repair the damage caused by ROS, as well as to regulate redox-sensitive signaling pathways. Three of the primary antioxidant enzymes contained in mammalian cells that are thought to be necessary for life in all oxygen metabolizing cells 6 are superoxide dismutase SODcatalase, and a substrate specific peroxidase, glutathione peroxidase GPx Fig.

The SODs convert superoxide radical into hydrogen peroxide and molecular oxygen O 2while the catalase and peroxidases convert hydrogen peroxide into water and in the case of catalase to oxygen and water.

The net result is that two potentially harmful species, superoxide and hydrogen peroxide, are converted to water.

catalase test ppt

SOD and catalase do not need co-factors to function, while GPx not only requires several co-factors and proteins but also has five isoenzymes. There are three SOD enzymes that are highly compartmentalized.

catalase test ppt

Other compartmentalized antioxidant enzymes include catalase, which is found in peroxisomes and cytoplasm, and GPx, which can be found in many sub-cellular compartments including the mitochondria and nucleus depending on the family member.

Thus, the many forms of each of these enzymes reduces oxidative stress in the various parts of the cell. Thus, antioxidant proteins with similar enzymatic activity may have different effects after modulation due to different localizations within cells.

There are three major types of primary intracellular antioxidant enzymes in mammalian cells - SOD, catalase, and peroxidase, of which glutathione peroxidase GPx is the most prominent.

If H 2 O 2 -removal is inhibited, then there is direct toxicity resulting from H 2 O 2 -mediated damage. If catalase is inhibited, cells also cannot remove H 2 O 2. Finally, if glucose uptake is inhibited creating a chemically induced state of glucose deprivation, hydroperoxide detoxification will also be inhibited. Besides its primary distribution in the cytosol, a small fraction of this enzyme has been found in cellular organelles such as lysosomes, peroxisomes, and the nucleus 8.Catalase is the enzyme that catalyzes to split up hydrogen peroxide into its reactant water and oxygen.

It has produced by a special kind of bacteria called staphylococci. Catalase enzyme has been utilizing in many different works like, topical disinfectant in wounds, bubbling that is observed because of the evolution of oxygen gas. The enzyme catalase helps in the breakdown of hydrogen peroxide into its reactants.

The presence of the enzyme in a midgut bacterial culture keep in the mind that the culture must not be older than 24 hoursis must at a point when to introduce a small amount of inoculum bacterial isolate into hydrogen peroxide, as a result the vigorous elaboration of oxygen bubbles observes. The lack of catalase may responsible for a lack of or weak bubble production. This is a test to figure out if an organism performs aerobic respiration.

It is a check for the existence of the electron transport chain that is the last phase of aerobic respiration. Typically, oxygen is the endmost electron acceptor for this system. This acceptor is a chemical dye that gradually changes color to a dark blue or purple when it takes the electron from the last element cytochrome oxidase in the electron transport chain. The Purpose of this site is to share my knowledge and Guide new Medical Students.

Save my name, email, and website in this browser for the next time I comment. In BiochemistryTests Tags catalase testcatalase test precautionscatalase test priniciplecatalase test procedureresults July 22, Views Hamza Khan.

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