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Fri, 28 Feb 2003 19:20:16 -0500 |
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Jean-claude wrote:
>WHt doe nutrient retention factor means? WHat survive the cooking ? or what
>is lost ?
According to the documentation of the USDA Nutrient Database, nutrient
retention factor is what survives the cooking, expressed in percent. I
think the following table is quite interesting:
http://www.nal.usda.gov/fnic/foodcomp/Data/retn4/retn4_tbl.pdf
It is widely used, but, it doesn't tell anything about the bioavailability
of nutrients after cooking.
>> I don't know the value for beef or any other ruminant. I wish I knew.
>> There's nothing in the USDA Nutrient Database, as you may have noticed
>> yourself. However I've read [1] that the human adrenal gland contains at
>> least 1
40 umol vitamin C per 100 g. I think that's around 25 mg per 100
>> g. Sounds little, because according to the same source, and as you surely
>> know, the gland in question is one the richest sources of vitamin C in
>> the human body.
>and adrenals are so small just few grams each , that sounds stange .
I guess I formulated myself badly. I wasn't talking about amount, I was
talkning about mass-density. You say that adrenals only weigh a few grams.
If that's true, and the vitamin C density is at least 25 mg per 100 g, then
there's between 250 and maybe 750 ug vitamin C in adrenals, at least. Not
very great amount. Correct me if I'm wrong.
>>(Same goes for pituitary glands and lens of the eye.)
>also rich in vit c?
Yes, according to these pages:
http://www.exrx.net/Nutrition/Antioxidants/VitaminC.html
http://ceiba.cc.ntu.edu.tw/nutrchem/vitc
.html
/Fredrik
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