From:
"Sukie Crandall"
Date: 2009-01-30 21:48:39 UTC
Subject: [ferrethealth] Re:IBD-FYI Rabbit meat
To: ferrethealth@yahoogroups.com
Well, just skimming but in several things it looks
like freezing has little to no effect on taurine
levels so is commonly done. In fact, it was
specifically used for this human health taurine
supplementation approach which also gives
some info on things that degrade taurine the
least:
http://www.functionalfoodnet.eu/asp/default.asp?p=65
BEGIN QUOTE
Taurine
The addition of taurine to tuna portions was also
addressed and performed by using a vacuum
tumbling procedure (taurine/phosphate solution)
with a target content in the fish of circa 1% on a
fresh weight basis (i.e. as eaten). The
taurine/phosphate solution did not influence
the sensory properties of the fish. The taurine
enriched tuna was processed by freezing, chilling,
freeze-chilling and sous vide cooking and showed
good retention of the added taurine. Cooking tests
on the frozen samples indicated that grilling gave
the highest level of taurine retention followed by
microwaving and steaming; the latter had a leaching
effect on the taurine.
END QUOTE
No freezing in this one but another table:
http://www.felinefuture.com/nutrition/taurine.php
I've found some very strange statements out there
in relation to taurine in general when looking around...
Okay, FINALLY:
BEGIN QUOTE
J Nutr. 1995 Oct;125(10):2650-7.
Diets causing taurine depletion in cats
substantially elevate postprandial plasma
cholecystokinin concentration.
Backus RC, Rogers QR, Rosenquist GL, Calam J, Morris JG.
Department of Molecular Biosciences, University
of California, Davis 95616, USA.
Excessive secretion of the intestinal hormone
cholecystokinin (CCK) was postulated to cause
diet-related taurine depletion in cats. To test this
hypothesis, plasma CCK-like immunoreactivity
(CCK-LI) was measured in cats given four diets,
two purified and two canned, that contained
similar concentrations of protein, fat, moisture
and taurine but produced variable rates of taurine
depletion. Plasma CCK-LI was measured by RIA
with a tyrosine-sulfate specific, C-terminal anti-serum,
validated for use in cat plasma. As indicated by
measurements of taurine in whole blood and urine,
a purified diet containing casein maintained body
taurine, whereas the same diet containing soybean
protein and a commercial canned diet preserved
either by freezing or cooking depleted body taurine.
Preprandial and peak postprandial plasma CCK-LI
in cats given the casein-containing diet were
10.6 +/- 1.4 and 27.6 +/- 4.8 pmol/L, respectively,
approximately two- to tenfold greater than those
reported in humans. Integrated postprandial
plasma CCK-LI was less for cats given the casein
diet than cats given both forms of the canned diet;
it tended to be lower in cats given the casein diet
than in cats given the soy protein diet. A negative
linear correlation was observed between apparent
nitrogen digestibilities of the diets and integrated
plasma CCK-LI. The results indicated that diets
that cause taurine depletion have lower protein
digestibilities and cause greater endocrine secretion
of CCK than diets that maintain body taurine status.
PMID: 7562102
END QUOTE
Now, notice that is OLD so I don't know if it still holds
up! Still, it is the sole thing I have found so far which seems
to frankly tackle the question of freezing.
Here is the full article for those who want to read it.
So, now I don't know if freezing is still thought to have an
effect, thought to have an effect with some sources but
not others, or thought to have an effect in current info.
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