What is Tributyrin Agar?

TRIBUTYRIN AGAR is a medium used for the detection and enumeration of lipolytic bacteria and moulds in foodstuffs and other materials. PRINCIPLE.

How do you make tributyrin agar?

Dissolve 20 g in 1 litre distilled water. Sterilize by autoclaving at 121°C for 15 minutes. Let cool to 80°C and add 10g neutral Tributyrin (91010). Mix thoroughly to emulsify the Tributyrin completely.

Is tributyrin agar selective or differential?


Tributyrin agar is a differential medium that tests the ability of an organism to produce an exoenzyme, called lipase, that hydrolyzes tributyrin oil.

What is Spirit Blue agar?

This agar is used to identify organisms that are capable of producing the enzyme lipase. This enzyme is secreted and hydrolyzes triglycerides to glycerol and three long chain fatty acids. These compounds are small enough to pass through the bacterial cell wall.

What is the composition of nutrient agar?

It typically contains (mass/volume): 0.5% peptone – this provides organic nitrogen. 0.3% beef extract/yeast extract – the water-soluble content of these contribute vitamins, carbohydrates, nitrogen, and salts. 1.5% agar – this gives the mixture solidity.

What are the components of tributyrin agar?

TRIBUTYRIN AGAR consists of a stable homogenate of nutrient agar and tributyrin (glyceryl tributyrate) frequently used for the detection of the lipolytic activity of specific organisms such as staphylococci, clostridia, pseudomonads and flavobacteria.

How would expired tributyrin agar?

How would expired Tributyrin Agar affect the results of lipase (+) and lipase (-) organisms? – Un-inoculated control will show the original opacity of the medium. A positive control will show what clearing looks like against that opacity.

What is lipid hydrolysis?

Lipid hydrolysis is usually carried out in the laboratory by refluxing oils and fats with different catalysts [6]. The reaction can be catalyzed by acid, base, or lipase, but it also occurs as an un-catalyzed reaction between fats and water dissolved in the fat phase at suitable temperatures and pressures [7].

What does a negative lipase test mean?

Results. Positive test: A positive lipase test is noted by the appearance of an iridescent sheen (oil on water) immediately around colonies that can be seen when the plate is held at an angle to a light source. Negative test: A negative lipase test is indicated by the absence of an iridescent sheen.

What is lipolysis stimulated by?

Lipolysis is stimulated by activation of β-adrenergic G-protein-coupled receptors (β-AR). Binding of noradrenalin (NA), adrenocorticotropic hormone (ACTH) or secretin leads to dissociation of the receptor-coupled trimeric Gs protein and stimulation of adenylate cyclase (AC), resulting in cAMP synthesis.

What is the difference between agar and nutrient agar?

The main difference between them is that nutrient agar contains a solidifying agent, agar powder that causes the medium to solidify in room temperature, whereas nutrient broth remains in liquid form.

Differences between nutrient agar and nutrient broth.

Differences Nutrient Agar Nutrient Broth
Type of Medium Solid Liquid

What is nutrient agar used for?

Nutrient agar is a general purpose medium that supports the growth of a wide range of non-fibrous organisms. Nutrient agar is popular because it supports the growth of various types of bacteria and fungi, and contains many of the nutrients necessary for the growth of bacteria.

What is difference between Broth and agar?

The only difference between broth and agar media is that broths do not contain an agar component. We use broth tubes primarily for specific assays, or (rarely) for bacteria that will not form colonies on a solid surface.

Why do we use broth media?

Why would a scientist choose to use a broth culture over agar? Broth cultures are convenient for growing a large number of bacteria very quickly. Scientists use these bacteria for other tests, combine them with freeze-medium for long-term storage, or inoculate them into other media for further experimentation.

What is the purpose of liquid broth media?

Growing Bacterial Cultures in Liquid Nutrient Broth

Liquid medium is convenient to use for growing bacteria in test tubes, and can reveal information about the oxygen requirements of bacteria growing within.

What is the purpose of a broth culture?

This growth media is placed in broth tubes, allowing bacteria to grow inside, and gets its name from the ingredients found in most broth tubes: beef extract, peptone, and table salt. However, broth culture can be defined as any liquid medium used to grow any type of bacteria.

How do you create a stock culture?


  1. Follow the steps for Inoculating an Overnight Liquid Culture.
  2. After you have bacterial growth, add 500 μL of the overnight culture to 500 μL of 50% glycerol in a 2 mL screw top tube or cryovial and gently mix.
  3. Freeze the glycerol stock tube at -80°C.

What is a major reason to grow bacteria in liquid culture?

However, a liquid culture is capable of supporting a higher density of bacteria and is used to grow up sufficient numbers of bacteria necessary to isolate enough plasmid DNA for experimental use.

What are the disadvantages of liquid media?

Disadvantages of liquid culture- Bacteria that grow in liquid media may not have specific characteristics. Difficult to isolate different types of bacteria from mixed populations. Bacteria grow diffusely in liquids they produce discrete visible growth in solid media.

What is liquid agar?

Liquid nutrient agar: This sterile agar is the easiest to use and the best choice for growing a variety of bacteria. Just heat and pour. Fills 10 dishes. Dehydrated agar powder, 6 grams: Just add water and sterilize (optional) for a pure base. Fills 15 dishes.

What is the name of the liquid medium in blood?

The liquid part, called plasma, is made of water, salts, and protein. Over half of your blood is plasma. The solid part of your blood contains red blood cells, white blood cells, and platelets.