Biochemical tests are laboratory procedures that use specific chemical reactions to identify and characterize microorganisms, such as bacteria. These tests are often used to identify the presence of specific enzymes or metabolic pathways in a microorganism, which can help to distinguish it from other microorganisms.
Some common biochemical tests used in bacteriology include:
Oxidase test: This test is used to detect the presence of the enzyme cytochrome oxidase, which is involved in the metabolism of oxygen.
Catalase test: This test is used to detect the presence of the enzyme catalase, which helps to break down hydrogen peroxide.
Indole test: This test is used to detect the presence of the enzyme tryptophanase, which breaks down the amino acid tryptophan.
Nitrate reduction test: This test is used to detect the ability of a microorganism to reduce nitrate to nitrite.
Gelatinase test: This test is used to detect the ability of a microorganism to produce the enzyme gelatinase, which breaks down gelatin.
These are just a few examples of the many different biochemical tests that are used in bacteriology. Biochemical tests can be useful for identifying and classifying bacteria, and for understanding their metabolism and ecological role.
It is a biochemical test used in microbiology for the identification of Streptococcus pneumoniae from other alpha hemolytic streptococci. It is mainly based on the ability of pneumococcal cells to undergo lysis in presence of bile salts. This test is commonly performed in diagnostic laboratories for confirmation of pneumococcal isolates. It is the process in … Read more
Leucine aminopeptidase (LAP) is an enzyme used to distinguish catalase-negative, gram-positive cocci of Aerococcus and Leuconostoc (LAP test negative) from other organisms in the group, such as Streptococcus, Enterococcus, Lactococcus, and Pediococcus (almost always positive).
It is a biochemical test that is used to determine the ability of microorganism to produce and secrete the enzyme lipase. It is also referred to as lipase test. The complex lipids such as triglycerides are large molecules and these cannot pass through the bacterial cell membrane. Due to this reason some bacteria releases the … Read more
A lipase test is a laboratory diagnostic test which is done to measure the level of lipase enzyme in the blood. Lipase is a digestive enzyme which is mainly produced by pancreas and it helps in digestion of fats. It is the process in which dietary triglycerides are broken down into fatty acids and glycerol … Read more
The purpose of the malonate test is to see if the organism can get all of its energy from malonate.
The oxidase enzyme is a key factor in distinguishing Staphylococcus from Micrococcus, and the Microdase Disk is a reagent-impregnated disc recommended for use in qualitative procedures.
What is API (Analytical Profile Index) 20E Test? The API (Analytical Profile Index) 20E test is a standardized biochemical identification system used for the identification of Enterobacteriaceae and other non-fastidious Gram-negative rods. It is developed as a miniaturized system where a number of biochemical reactions are carried out simultaneously in a single plastic strip. It … Read more
The novobiocin (antibiotic) differentiation disc can be used in the Novobiocin Susceptibility Test to help make a preliminary distinction between Staphylococcus saprophyticus and other coagulase-negative staphylococci (CoNS) in clinical (urinary) specimens.
The Oxidation–Fermentation (OF) test is a biochemical test that is used to differentiate bacteria on the basis of their ability to metabolize carbohydrates by oxidative or fermentative pathways. It is the process that helps in identifying whether the organism utilizes carbohydrate in the presence of oxygen or in the absence of oxygen. This test was … Read more
Pyruvate Broth Test is a biochemical test that is used in microbiology for identification and differentiation of certain bacteria. It is mainly used for differentiating species of Enterococcus group. It is the process in which ability of organism to utilize sodium pyruvate as a sole source of energy is determined. The medium used in this … Read more
