what's the difference between rancid, rotten, moldy, and sour?

MrBond

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Feb 5, 2000
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Meat gets rancid, cheese and breads get moldy, vegetables and fruits get rotten, and dairy products go sour
 

dpopiz

Diamond Member
Jan 28, 2001
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Originally posted by: minendo
Rancidity is caused by the breakdown of fats.

yeah that's what I'm getting at. how are they technically different? in other words, what's happenning in each case that makes it "rancid" or "rotten" or "moldy" or "sour"?
 

minendo

Elite Member
Aug 31, 2001
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Originally posted by: dpopiz
Originally posted by: minendo
Rancidity is caused by the breakdown of fats.

yeah that's what I'm getting at. how are they technically different? in other words, what's happenning in each case that makes it "rancid" or "rotten" or "moldy" or "sour"?

Different bacterial growth.
 

dullard

Elite Member
May 21, 2001
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My wife took a food science class. Her textbook and professor both said there are two technical definitions of bad food.

Rancid - when a food with oil or fat content spoils
Putrid - when any other food spoils

The following is my interpretation of the other terms asked about:

Moldy is only somewhat related, it means that mold is growing on it. Thus moldy bread is technically putrid as it has spoiled. Moldy meat is technically rancid. Moldy cheese is neither rancid nor putrid since all cheese is moldy - it is a desired trait.

Sour is a taste. Many products taste sour when they become rancid or putrid. Thus sour has become another word for rancid or putrid - even though sour isn't the official designated definition.
 

Encryptic

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May 21, 2003
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Originally posted by: dpopiz
Originally posted by: minendo
Rancidity is caused by the breakdown of fats.

yeah that's what I'm getting at. how are they technically different? in other words, what's happenning in each case that makes it "rancid" or "rotten" or "moldy" or "sour"?

Bacterial growth, mold spores sprouting, etc. Basically, the stuff is aging naturally and being broken down at the same time by the bacteria or mold growing on it. It's not alive anymore so it doesn't have the defenses that would normally prevent decay from happening.