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The curd is the fat in the milk that sticks together.
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I think it is the proteins rather than the fat that are responsible for the formation of curd - after all you can get fat free curd cheese.
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∙ 13y ago
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What type of property is observed when milk sours?
When milk sours it is a chemical change. It is caused by lactic acid which converts the milk and makes it become sour.
List 4 ways in which bacteria are helpful to people?
1.Bacteria play the role of converting milk into curd. 2. They are the antibiotics which we use(eg. penicilin) 3.They decompose the dead animals.
Is Curdling of milk a chemical change?
when milk curs it is a chemical change. A physical change is change in form, which is revesrable. Like water being frozen then thawed. A chemical change is irreversible, and involves a change in the chemical make up. What is happening is a new compound is being formed by the milk reacting with the air and such.
Can you get sick from drinking curdled milk?
However curd is simply another form of milk, but yes its True, curd is better than milk for reasons: - it is more easily digestible as it is already in broken form than milk. - more acceptable by body - keeps the body cool and relaxed. thanks, Vandana.
Why does milk get curdled when curd is added to it?
First you need to understand what milk is, other than a just a white liquid you get from mammary glands. Milk is an emulsion of fat, water, lactose (a type of sugar) and a mixture of proteins (loads of other stuff, but these are what we will talk about). The small fat globules are surrounded by a skin of phospholipids and proteins, which are chemicals that help them stay as small globules in the mix, rather than clumping together into a big pat of butter. If you beat the milk, that is exactly what happens - and is how you make butter from milk. The water in the milk contains soluble proteins, which wander around by themselves in the liquid, and proteins which have one end which likes water, and one end which doesn't. Think of a match - a red head on one end, with a tail of wood trailing behind. In order for the "water hating" ends of the protein (the wood of the match) to stay away from the water they are floating in, these proteins arrange themselves into globes called micelles. Kind of like a circle of cows in a field standing in a protective circle, with all of the tails in the center and a circle of heads looking outwards. The proteins that do this are called caseins, there are four different types and they make up about 80% of the weight of the total protein in the milk. The outer layer of these micelles is make up of a type of casein known as kappa-casein, and the kappa casein reaches out a bit into the surrounding liquid. Under an electron microscope, each ball looks a bit like a little polystyrene ball (like you get in bean bags and the like), with a bit of a lumpy surface. The kappa-casein has a negative charge, and as like charges repel, all of the micelles stay away from each other - which keeps them in solution. An acid is any chemical which loves to give (positively charged) protons away, and the stronger the acid, the stronger the tendency to force protons onto other chemicals (which usually breaks them down into simpler structures - this is the iconic "fizzing" you see in Hollywood movies involving acids.) As you add acid to milk, say by pouring in lemon juice, or by letting bacteria turn the milk sugar lactose into lactic acid, more and more positively charged protons are given to the negatively charged kappa-casein, the kappa-casein loses its charge and so the casein micelles begin to clump together. Eventually the clumps become big enough to see - which are the lumps we call curds, and the process is called curdling. Good if you want to collect the curds to make cheese. Bad if you want a smooth drink or sauce! If you heat the milk up to at least 85 degrees C before you add the acid, then the kappa-casein reacts with the soluble protein (called a whey protein, because it doesn't mind floating around by itself in the watery whey) b-lacto- globulin. The result is a complex which makes the casein micelle surface markedly coarser, so if you now add acid (usually by allowing a "good tasting" bacteria to turn the lactose into lactic acid) the casein micelles clump into an open spongy gel. This sponge soaks up the liquid, and you end up with Yogurt. Yogurt is much more stable in cooking and accepting acid for this reason.
What is the difference between curd and churn?
Curd: a soft white substance formed when milk sours. Curds are used in making cheese. Churn: agitating or turning. The term in cooking means churning (agitating or turning) milk or cream to make butter.
How lactobacillus make milk to curd?
it can make milk in to curd because it has a special chemical called lacto that changaes milk into curd
What type of property is observed when milk sours?
When milk sours it is a chemical change. It is caused by lactic acid which converts the milk and makes it become sour.
Which organisms turn milk into curd?
bacteria turns milk into curd.
Does combination of milk and curd cause food poisoning?
Curd &milk are posine or not
How milk turns curd?
Due to process fermentation of microorganism the milk turns into curd.
How is cheese curd made?
Rennet is added to milk and forms curds and whey. The whey is then tapped off leaving the curds.
What can you make with a curd?
Curd or coagulated milk; is used to make cheese.
Curd is more acidic than milk is this true?
curd is more acidic than milk .Because when milk is changed to curd it's pH value decreases due to the formation of lactic acid.
Formation of curd from milk is which reaction?
Formation of curd in milk is called 'Fermentation'.Curd is formed when milk is pasteurised and fermented by a combination of lactic acid bacteria and a protease.
How do you prepare curd from milk witout using starter curd?
I haven't tried it, but I read it somewhere, you can prepare curd without using starter curd, but instead add a few drops of lemon to luke warm milk in the same manner as u do for curdling milk.
Is a bottle of milk that sours a physical or chemical change?
This is a chemical change.
