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The methylene blue reduction test is based on the fact that the color imparted to milk by the addition of a dye such as methylene blue will disappear more or less quickly. The removal of the oxygen from milk and the formation of reducing substances during bacterial metabolism causes the color to disappear. The agencies responsible for the oxygen consumption are the bacteria. Though certain species of bacteria have considerably more influence than others, it is generally assumed that the greater the number of bacteria in milk, the quicker will the oxygen be consumed, and in turn the sooner will the color disappear. Thus, the time of reduction is taken as a measure of the number of organisms in milk although actually it is likely that it is more truly a measure of the total metabolic reactions proceeding at the cell surface of the bacteria.
Wiki User
∙ 13y ago
Wiki User
∙ 12y agoIt is necessary because it consumes very less time and tells us about the quality of a milk sample. thought the best method is a plate count method but it needs minimum 24-48 hours to give results and to tell us about the bacterial content of the milk. methylene blue reduction test gives result in maximum 6-8 hours and tells about the active metabolizing bacteria present in the milk. this is commonly done in milk and food industries when the industry receives thousands of liter milk from milkmen.
Wiki User
∙ 9y agoBy adding a dye to the milk like methylene blue will disappear less or more quickly. This depends on the quality of the sample of milk.
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What are the uses of lactometers?
A Lactometer is a little glass instrument that tests the purity of milk based on density/buoyancy and works on the principle of the specific gravity of milk. It is based on the Archemedes' principle. When we put loctometer inside the liquid it experience buoyant force(weight of displace fluid). Hence measure relative density in the given scale of loctometer. Lower the density of liquid farther, the loctometer will sink.
What colour should the universal indicator turn when mixed with milk?
it will remain neutral as products of neutralisation are salts and water
What are the ingredients of MnMs?
Milk Chocolate (Sugar, Chocolate, skim milk, Cocoa Butter, lactose, milkfat, Soy Lecithin, salt, artificial flavor), Sugar, Cornstarch, less than 1% - Corn Syrup, dextrin, coloring (includes blue 1 lake, yellow 6, red 40, yellow 5, blue 1, red 40 lake, blue 2 lake, yellow 6 lake, blue 2), Gum Acacia.
What liquid will sink in milk?
well jaz has a penholder n it has a blue liquid that sinks to the bottem of water with a silver glaze on the top of the blue liquid, it must be like a heavier more solid liquid
What colour does litmus paper turn when dipped in milk?
Milk of magnesia is chemically known as magnesium hydroxide. Although this compound isn't very water soluble, the small amount that does dissolve acts as a base. Thus, milk of magnesia is somewhat basic, and litmus paper would turn blue if exposed to it. Nice....
What food can methylene blue be used in to detect bacteria quickly?
Methylene blue reduction is the method used to measure the bacterial density in milk. The test is evaluated in term of the amount of time required from introduction of the blue until the milk turns white.
What happens when milk is added to methylene blue?
it spoils the milk because of the chemicial reaction
What happens when methylene blue is added to stale milk?
it spoils the milk because of the chemicial reaction
Can methylene blue be used in other food besides milk?
Yes, methylene blue can be used in many foods, as it in non-toxic to humans (though it can discolor urine). Methylene blue was used by Italian actor and gourmand, Ugo Tognazzi for his risotto alla parmigiana (risotto blu). He added methylene blue to the standard ingredients (butter, onions, Parmesan cheese, and white wine), turning it into a rather striking "blue risotto."
What is the principle of lactometer?
A Lactometer is a little glass instrument that tests the purity of milk based on density/buoyancy and works on the principle of the specific gravity of milk.
How do you use ginger juice with milk for weight reduction?
suck it u freak
How bacteria help in making curd?
curd contain lactobacillus which can be stained with simple stain i.e. methylene blue which will stain it in blue colour and also can be stained with gram stain as lactobacillus is gram +ve so it will give again blue colour in gram stain.
How do you test the purity of milk using Archimedes principle?
Lactometer is a device used for finding the purity of a milk sample. It works on the principle of Archimede's principle that a solid suspended in a fluid will be buoyed up by a force equal to the weight of the fluid displaced. If the milk sample is pure, then the lactometer floats on it and if it is adulterated or impure, then the lactometer sinks.
What is the difference between blue and green top milk?
Blue topped milk is more fat, when the green top milk is semi-skimmed milk which means less fat.
What is Principle of determination of yeast mould in milk?
one daiu there b
When was Blue Wonder Power Milk created?
Blue Wonder Power Milk was created on 1998-08-11.
What provisions of the constitution most clearly reflects the principle of the consent of the governed?
Milk
