What is the function of spirit blue dye in spirit blue agar?
Spirit blue or Opal blue SS is a dye with formula C37H30ClN3. It is used as an indicator in agar for detection of lipase activity in bacteria.
What bacteria test positive for lipid hydrolysis?
Helpful in identifying bacteria that secrete lipase, including members of Enterobacteriaceae, Fusobacterium, Propionibacterium, Clostridium, Pseudomonas, Mycoplasma, Corynebacterium, and Staphylococcus.
How do you make spirit blue agar?
A satisfactory emulsion can be prepared by dis- solving 10 g gum acacia or 1 mL polysorbate 80 in 400 mL warm purified water, adding 100 mL cottonseed or olive oil and agitating vigorously to emulsify. Spirit Blue Agar contains peptone as a source of carbon, nitrogen, vitamins and minerals.
What is Tributyrin hydrolysis test?
Tributyrin agar is a differential medium that tests the ability of an organism to produce an exoenzyme, called lipase, that hydrolyzes tributyrin oil. When an organism produces lipase and breaks down the tributyrin, a clear halo surrounds the areas where the lipase-producing organism has grown.
Why do bacteria hydrolysis lipids?
Lipids generally are nonpolar molecules that do not dissolve well in water. In order to utilize fats, bacterial cells secrete exoenzymes known as lipases outside of the cell that hydrolyze the lipid to fatty acids and glycerol. These bacteria capable of producing exoenzyme lipase are called lipolytic bacteria.
What type of media is Spirit Blue agar?
Spirit blue agar is a nutrient medium with the dye spirit blue present. It also contains an emulsified lipid to serve as the target for the enzyme. For the test in this program, that emulsified lipid is assumed to be corn oil.
What happens when lipids are hydrolysed?
Hydrolysis can break down a fat or oil and release the triglycerol and fatty acids. An enzyme called lipase catalyses the hydrolysis of the fats and oils. When the hydrolysis occurs the fatty acids will be released and the acidity of the reaction mixture will rise.
What causes the formation of a deep blue color in a spirit blue agar plate?
Spirit blue agar contains an emulsion of olive oil and spirit blue dye. Bacteria that produce lipase will hydrolyze the olive oil and produce a halo around the bacterial growth.
What is the purpose of the lipid hydrolysis test?
Lipid Hydrolysis Test Objective. The main aim of the Lipid Hydrolysis Test is to determine the ability of the organism that whether it has a capability to hydrolyze a lipid. To identify the species of the bacteria that are capable producing an exoenzyme lipase.
What is lipid hydrolysis?
HYDROLYSIS OF LIPIDS. 6. Hydrolysis is the breakdown of a substance by the addition of water. Fats and oils are hydrolyzed by moisture to yield glycerol and 3 fatty acids. This leads to hydrolytic rancidity of food product characterized by unpleasant flavor and aroma thereby making it undesirable forconsumers.
What does the spirit blue agar detect and why?
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.
Where does fat hydrolysis occur?
To obtain energy from fat, triglycerides must first be broken down by hydrolysis into their two principal components, fatty acids and glycerol. This process, called lipolysis, takes place in the cytoplasm.