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Duration of time before fats oxidize while making broth

Answered on August 19, 2014
Created December 15, 2012 at 9:10 AM

I always use the fat that I get from making broth for cooking, but recently, I realized that fats oxidize, not only from exposure high heat, but also from extended cooking time. I noticed that when I added some left over shrimp heads and shells along with the chicken carcass and marrow bones to make a soup stock, that it initially tasted great when I tested it a few hours into the brew, but when I left the broth to simmer the rest of the day, the broth developed an off taste. I think perhaps the Omega3s from the shrimp heads had oxidized. As I paid more attention to the quality of each batch of broth that I made, I noticed that if I leave a meat stock on the slow cooker for 24 hours, there would already a slight smell of rancidity. So, my question is, how long does it take for the different fats, chicken, pork, beef, shrimp and fish to oxidize when left to simmer, or is it better just to skim off the oil immediately as it floats to the surface?

Cdaf7199895ec3943b2b43f78693c9ef

(45)

on December 24, 2012
at 11:38 AM

Also, a glob of oil in each shrimp head verifies that this whole cholesterol theory is flawed and reminds me of something that a Chi Gong master/naturopathic doctor once told me. He said that the brain is seated in a vat of cholesterol and that without cholesterol, we wouldn't even be able to think. Now looking at the shrimp head and seeing that it is filled with oil, I realize that probably what the doctor told me was true.

Cdaf7199895ec3943b2b43f78693c9ef

(45)

on December 24, 2012
at 11:37 AM

Also, a glob of oil in each shrimp head verifies that this whole cholesterol theory is flawed and reminds me of something that a Chi Gong master/naturopathic doctor once told me. He said that the brain is seated in a vat of cholesterol and that without cholesterol, we wouldn't even be able to think. Now looking at the shrimp head and seeing that it is filled with oil, I realize that probably what the doctor told me was true. – Gwong 0 secs ago

Cdaf7199895ec3943b2b43f78693c9ef

(45)

on December 24, 2012
at 11:35 AM

Also, a glob of oil in each shrimp head verifies that this whole cholesterol theory is flawed and reminds me of something that a Chi Gong master/naturopathic doctor once told me. He said that the brain is seated in a vat of cholesterol and that without cholesterol, we wouldn't even be able to think. Now looking at the shrimp head and seeing that it is filled with oil, I realize that probably what the doctor told me was true. – Gwong 0 secs ago –

Cdaf7199895ec3943b2b43f78693c9ef

(45)

on December 24, 2012
at 11:28 AM

Also, regarding a glob of oil in each shrimp head. It reminded me of something that a Chi Gong master/naturopathic doctor once told me. Contrary to conventional thinking, he said that the brain is seated in a vat of cholesterol and that without cholesterol, we wouldn't even be able to think. Now looking at the shrimp head and seeing that it is filled with oil, I realize that probably what the doctor told me was true. – Gwong 0 secs ago

Cdaf7199895ec3943b2b43f78693c9ef

(45)

on December 24, 2012
at 11:22 AM

Also, regarding a glob of oil in each shrimp head. It reminded me of something that a Chi Gong master/naturopathic doctor once said. He told me, contrary to conventional thinking that cholesterol was good and this was way before the evidence regarding the misconception of cholesterol came up up. Anyway, this doctor told me then that the brain is seated in a vat of cholesterol and that without cholesterol, we wouldn't even be able to think. Now looking at the shrimp head and seeing that it is filled with oil, I realize that probably what the doctor told me was true.

Cdaf7199895ec3943b2b43f78693c9ef

(45)

on December 24, 2012
at 11:09 AM

Are your statics based on a pound of shrimp that you get from a regular supermarket? Most of them do not include the heads. I'm referring to shrimp shells with heads. Without the head, shrimp hardly has any fat, but if you look at a shrimp head, you'll see a glob of orange oil in each head and if you boil the heads, you'll actually see a layer of orange oil floating on the top of the broth. But thanks for the information on the rate of oxidation. I've already decided that the next time I make broth, with or with shrimp heads, I'm going to skim the fat as soon as it floats to the top.

  • Cdaf7199895ec3943b2b43f78693c9ef

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1 Answers

2
32f5749fa6cf7adbeb0b0b031ba82b46

(41757)

on December 15, 2012
at 02:20 PM

I really doubt you had issues with your shrimp shell stock, at least from the fats. 1 pound of shrimp has but 2 grams of fat, only 0.7 grams of PUFA. Now, you're just talking shells, there's going to be essentially zero fat in there. It's very likely something else was causing the problem.

Talking chemistry, the general rule of thumb is that every 10 degrees C you increase the temperature, you double reaction rates. Boiling at 100C means you're oxidizing fats 200 times faster than room temperature. Probably sounds scarier than it actually is.

Cdaf7199895ec3943b2b43f78693c9ef

(45)

on December 24, 2012
at 11:35 AM

Also, a glob of oil in each shrimp head verifies that this whole cholesterol theory is flawed and reminds me of something that a Chi Gong master/naturopathic doctor once told me. He said that the brain is seated in a vat of cholesterol and that without cholesterol, we wouldn't even be able to think. Now looking at the shrimp head and seeing that it is filled with oil, I realize that probably what the doctor told me was true. – Gwong 0 secs ago –

Cdaf7199895ec3943b2b43f78693c9ef

(45)

on December 24, 2012
at 11:38 AM

Also, a glob of oil in each shrimp head verifies that this whole cholesterol theory is flawed and reminds me of something that a Chi Gong master/naturopathic doctor once told me. He said that the brain is seated in a vat of cholesterol and that without cholesterol, we wouldn't even be able to think. Now looking at the shrimp head and seeing that it is filled with oil, I realize that probably what the doctor told me was true.

Cdaf7199895ec3943b2b43f78693c9ef

(45)

on December 24, 2012
at 11:22 AM

Also, regarding a glob of oil in each shrimp head. It reminded me of something that a Chi Gong master/naturopathic doctor once said. He told me, contrary to conventional thinking that cholesterol was good and this was way before the evidence regarding the misconception of cholesterol came up up. Anyway, this doctor told me then that the brain is seated in a vat of cholesterol and that without cholesterol, we wouldn't even be able to think. Now looking at the shrimp head and seeing that it is filled with oil, I realize that probably what the doctor told me was true.

Cdaf7199895ec3943b2b43f78693c9ef

(45)

on December 24, 2012
at 11:09 AM

Are your statics based on a pound of shrimp that you get from a regular supermarket? Most of them do not include the heads. I'm referring to shrimp shells with heads. Without the head, shrimp hardly has any fat, but if you look at a shrimp head, you'll see a glob of orange oil in each head and if you boil the heads, you'll actually see a layer of orange oil floating on the top of the broth. But thanks for the information on the rate of oxidation. I've already decided that the next time I make broth, with or with shrimp heads, I'm going to skim the fat as soon as it floats to the top.

Cdaf7199895ec3943b2b43f78693c9ef

(45)

on December 24, 2012
at 11:37 AM

Also, a glob of oil in each shrimp head verifies that this whole cholesterol theory is flawed and reminds me of something that a Chi Gong master/naturopathic doctor once told me. He said that the brain is seated in a vat of cholesterol and that without cholesterol, we wouldn't even be able to think. Now looking at the shrimp head and seeing that it is filled with oil, I realize that probably what the doctor told me was true. – Gwong 0 secs ago

Cdaf7199895ec3943b2b43f78693c9ef

(45)

on December 24, 2012
at 11:28 AM

Also, regarding a glob of oil in each shrimp head. It reminded me of something that a Chi Gong master/naturopathic doctor once told me. Contrary to conventional thinking, he said that the brain is seated in a vat of cholesterol and that without cholesterol, we wouldn't even be able to think. Now looking at the shrimp head and seeing that it is filled with oil, I realize that probably what the doctor told me was true. – Gwong 0 secs ago

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