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Biochemical Test

Biochemical tests are the tests that are performed on different bacteria for their identification on the basis of their biochemical activities towards different biochemical compounds.

  • Biochemical tests are one of the traditional methods for the identification of microorganisms, usually performed with phenotypic identification.
  • For many years these methods were employed extensively, and they continue to be used nowadays, especially in some laboratory routines where a particular type of microorganism has to be identified rapidly.
  • The ability of microorganisms to utilize certain biomolecules, resulting in useful organic compounds for themselves forms the basis of various biochemical tests.
  • Biochemical tests are of different types, where the identification or distinction between different microorganisms is made on various bases.
  • One of the traditional methods commonly used is a simple visual detection of the growth of the organism in the presence of essential nutrients by increased turbidity in the liquid medium.
  • In other tests, however, the results are based on the change in color of the medium as a result of the change in the pH of the medium.
  • Microorganisms can be classified into different groups on the basis of their reaction to such tests. Some tests even allow the distinction of microorganisms to the species level.
  • Biochemical tests are thus, essential as they are inexpensive and relatively simple to perform.
  • The physiology of bacteria and other microorganisms differs from one another, which allows for the differentiation of such microorganisms.
  • Biochemical tests, however, have some disadvantages. Despite being inexpensive and allowing both quantitative and qualitative information about the diversity of microorganisms present in a sample, these methods are laborious and time-consuming, and results are only observed after several days.
  • In some cases, false positives are obtained, especially when considering similar microbial species.

Hydrogen Sulfide (H2S) Test: Principle, Procedure, Results

December 19, 2024August 12, 2024 by Prashant Dahal
Hydrogen Sulfide (H2S) Test

Hydrogen Sulfide (H2S) Test is the biochemical test used to detect the ability of bacteria to produce H2S gas. Several bacteria and archaea can metabolically reduce sulfur-containing compounds to hydrogen … Read more

Biochemical Test of Klebsiella pneumoniae

January 2, 2025July 3, 2024 by Sagar Aryal, PhD
Biochemical Test of Klebsiella pneumoniae

Characteristics Klebsiella pneumoniae Capsule +ve Catalase +ve Citrate +ve Flagella -ve Gas +ve Gelatin Hydrolysis -ve Gram Staining -ve Growth in KCN +ve H2S -ve Indole -ve Motility -ve MR … Read more

IMViC Test: Principle, Result Chart, Examples, Uses

May 26, 2024May 4, 2024 by Prashant Dahal
IMViC Tests

IMViC test is a series of four different biochemical tests used in identifying and differentiating bacteria, especially the members of Enterobacteriaceae. Though it can be (and is) used for the … Read more

Nitrate Reduction Test- Principle, Procedure, Types, Results, Uses

February 18, 2024January 2, 2024 by Prashant Dahal
Nitrate Reduction Test

In the anaerobic respiration process, bacteria derive their required oxygen from nitrate (NO3–) or can use NO3– as a terminal electron acceptor. In either of these processes, nitrate is first … Read more

Sulfur Reduction Test: Principle, Procedure, Results, Uses

October 6, 2023 by Prashant Dahal
Sulfur Reduction Test

Elemental sulfur and sulfur-containing compounds โ€“ both organic and inorganic compounds โ€“ can be metabolically reduced by some microorganisms to obtain metabolic energy. Such microorganisms are called sulfur-reducing microorganisms. Several … Read more

TSIA Test: Principle, Media, Procedure, Results, Uses

October 5, 2023 by Prashant Dahal
TSIA Test

When it comes to the biochemical activities and enzyme systems, each bacterial genus has its unique characteristics. These unique characteristics are the basis for differentiating and identifying bacteria based on … Read more

Satellitism Test: Principle, Media, Procedure, Results, Uses

October 6, 2023October 3, 2023 by Prashant Dahal
Satellitism Test

Haemophilus spp. requires either or both of the X-factor (hemin or protoporphyrin IX) and V-factor (nicotinamide adenine dinucleotide (NAD)) for their growth and survival. Haemophilus spp. can be distinguished down … Read more

Spot Indole Test: Principle, Procedure, Results, Uses

October 6, 2023October 1, 2023 by Prashant Dahal
Spot Indole Test

Spot indole test method is a rapid indole detection method where bacteria cultivated in the tryptophan-rich medium are directly exposed to an Indole Reagent for detection of indole production. The … Read more

Starch Hydrolysis Test: Principle, Procedure, Results, Uses

August 1, 2023 by Sagar Aryal, PhD
Starch Hydrolysis Test

Starch is the reserved food material of most plants and is one of the abundant carbohydrates in nature. Starch is a polysaccharide made of two glucose polymers โ€“amylose and amylopectin. … Read more

X and V Factor Test: Principle, Procedure, Results

July 15, 2023 by Sagar Aryal, PhD
X and V Factor Test forย Haemophilus

Haemophilus spp. is a genus of Gram-negative, aerobic or facultatively anaerobic, pleomorphic (mostly coccobacilli), Gammaproteobacteria of the phylum Pseudomonadota and family Pasteurellaceae. Several species of the genus Haemophilus are pathogenic … Read more

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