A change in texture may also occur in spoiled yogurt. If you stir the yogurt with a spoon and notice that its texture looks grainy, unusually thick or curdled, it should be tossed. Spoiled yogurt may also have a sour smell or even visible mold of any color, which are both obvious indications that it shouldn’t be eaten.
A. Sometimes over culturing (too long or too warm) can cause the yogurt to curdle or become lumpy before it separates fully. To make a smooth consistency, simply whisk it. (Remove some of the whey if you like, or stir it back in.)
Most yogurt problems, including breaking and clumping, are caused by poor temperature control. Heating the milk too much during incubation, over incubating, or erratic temperatures, can all cause your bacteria to misbehave. Often this causes the yogurt to be too acidic and to curdle which would explain your clumping.
Smell: Yogurt should have a fresh, pleasant, fermented smell. It can smell sour, but should not be pungent (strong or sharp). If it smells rancid, foul, spoiled, strongly acidic, rotten, or off-putting, something other than yogurt bacteria has cultured and it should be thrown out. Taste: Yogurt should taste pleasant.
Curdled yogurt is fine to eat if it has curdled from heat. Yogurt might even curdle if it is left to sit in the fridge for an extended period of time. This is also perfectly fine to stir back into the yogurt and eat, as long as the yogurt does not have a rancid smell, or has not clumped up like cottage cheese.
A. Sometimes over culturing (too long or too warm) can cause the yogurt to curdle or become lumpy before it separates fully. To make a smooth consistency, simply whisk it. (Remove some of the whey if you like, or stir it back in.)
How Do You Know If Yogurt Has Gone Bad?
Jul 22, 2021
A. Sometimes over culturing (too long or too warm) can cause the yogurt to curdle or become lumpy before it separates fully. To make a smooth consistency, simply whisk it. (Remove some of the whey if you like, or stir it back in.)
A change in texture may also occur in spoiled yogurt. If you stir the yogurt with a spoon and notice that its texture looks grainy, unusually thick or curdled, it should be tossed. Spoiled yogurt may also have a sour smell or even visible mold of any color, which are both obvious indications that it shouldn’t be eaten.
Culturing yogurt for too long, at too high a temperature, or with an unreliable or compromised starter culture can cause yogurt to separate or turn lumpy. If your yogurt turns lumpy, strain it to remove the whey, then beat the yogurt solids in a bowl with a whisk until it turns smooth
Most yogurt problems, including breaking and clumping, are caused by poor temperature control. Heating the milk too much during incubation, over incubating, or erratic temperatures, can all cause your bacteria to misbehave. Often this causes the yogurt to be too acidic and to curdle which would explain your clumping.
Setting the yogurt at a lower set temperature of 104 F will produce acid at a slower rate, with less probability of shocking the dairy proteins. So if you are having trouble with a grainy texture, try setting your yogurt at a lower set temperature with the same culture. You may be surprised at the results.
When the yogurt base is pumped into the fermentation vat, it will immediately coagulate (or directly acidify), resulting in very stable flocs of milk protein. This curd will not re-dissolve in the base during incubation and may not be broken down by the smoothing device, resulting in a grainy product.
Smell: Yogurt should have a fresh, pleasant, fermented smell. It can smell sour, but should not be pungent (strong or sharp). If it smells rancid, foul, spoiled, strongly acidic, rotten, or off-putting, something other than yogurt bacteria has cultured and it should be thrown out. Taste: Yogurt should taste pleasant.
Typically, homemade yogurt will stay fresh in the fridge for at least two weeks. However, please note that if you plan to use your homemade yogurt to start another batch, it should not be older than 7-10 days for the best results.
This acid environment is safe and free from things like botulism. But even if something goes wrong, you are not going to get botulism from this. During fermentation, the milk is not sealed in a jar. So you are working in an aerobic environment (oxygen is present), making botulism a non-issue here.
2 weeks
Culturing yogurt for too long, at too high a temperature, or with an unreliable or compromised starter culture can cause yogurt to separate or turn lumpy. If your yogurt turns lumpy, strain it to remove the whey, then beat the yogurt solids in a bowl with a whisk until it turns smooth.
How Do You Know If Yogurt Has Gone Bad?
Jul 22, 2021
It is completely normal for yogurt to separate in the fridge, with the liquid whey separating from the solid yogurt. This also happens as the bacteria ferments milk into yogurt, leaving the liquid whey floating at the top. It isn’t just water, but rather a very beneficial by-product of the fermenting process as well.
If you eat spoiled yogurt from an opened container, then you may have some painful stomach cramps and diarrhea (possibly nausea) shortly after ingestion. But in both of these instances, the yogurt will taste badmeaning, you likely won’t even want to eat it in the first place.
Look for a larger-than-normal amount of liquid on the surface (don’t worry, Greek yogurt is especially prone to some, but if there’s more than usual that’s a warning sign), a curdling texture near the bottom, and any sign of mold. These indicate the entire product has probably gone bad, say the folks at StillTasty.
The United States Food and Drug Administration inspects other foods. Yogurt can be stored in the refrigerator (40 xbaF) one to two weeks or frozen (0 xbaF) for one to two months. Soft cheeses such as cottage cheese, ricotta or Brie can be refrigerated one week but they don’t freeze well.
Keep Yogurt Fresh: Storage Handling Yogurt should be stored in the refrigerator below 40 degrees F. When stored properly, the shelf-life of yogurt is seven to 14 days. Storing longer than that allows molds, yeast and slow-growing bacteria to grow and spoil your yogurt.
A change in texture may also occur in spoiled yogurt. If you stir the yogurt with a spoon and notice that its texture looks grainy, unusually thick or curdled, it should be tossed. Spoiled yogurt may also have a sour smell or even visible mold of any color, which are both obvious indications that it shouldn’t be eaten.
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