"gene" > wrote in message
et...
> Lum Eisenman wrote:
> > "Ric" > wrote in message
> > ...
> >
> >>Are you real sure of the numbers, Lum? I don't have my chem texts with
> >>me right now - will check tomorrow - but 3 ppm of copper sulfate sounds
> >>pretty high --- anyone know the 'safe' limits of CuSO4? I thought it was
> >>in the neighborhood of something less than 1 ppm.
> >>
> >>Personally, I wouldn't want to drink wine with anything like 'too much'
> >>CuSO4 in it.
> >>
> >>At the very least - JG might want to consider bentonite fining the wine
> >>in the hope of dropping some copper ions?
> >>
> >>
> >>
> >>>Don't dump that wine yet Joe.
> >>>The label on my jar of vitamins says........"each tablet contains 3
> >>>milligrams of copper (150% of the minimum daily requirement)." If your
> >
> > wine
> >
> >>>contains 3 milligrams of copper per liter, one 750 liter bottle of wine
> >>>would contain 2.25 milligrams of copper or just about the MDR of
copper.
> >>>I would drink the wine. But, I would make sure I didn't drink more
than
> >
> > 3
> >
> >>>or 4 bottles per day.
> >>>Lum
> >>>Del Mar, California, USA
> >>>www.geocities.com/lumeisenman
> >
> >
> > I am NOT real sure of the numbers Rick.
> > I am sure of the quote from the label on my vitamin bottle.
> > I am also sure that Bentonite will not remove any significant amount of
> > copper from wine. But, fining with dry yeast can reduce the copper
content
> > of wine considerably.
> > Lum
> >
> >
> Here's the numbers from 24 CFR 184:
>
> Copper sulfate: To remove hydrogen sulfide and/or mercaptans from
> wine. "The quantity of copper sulfate added (calculated as copper)
> shall not exceed 0.5 part copper per million parts of wine (0.5 mg/L)
> with the residual level of copper not to be in excess of 0.5 part per
> million (0.5 mg/L). 21 CFR 184.1261 (GRAS)."
>
> Yes, in wine it is supposed to be less that 0.5 ppm.
>
> The 3mg per liter amount is not typically considered critically
> dangerous, as the human body has a good mechanism for excreting excess
> copper. But it's not a good idea to challenge your body too much with
> copper, your body has its limits of coping, and is slow at excreting
> excess copper. The most immediate issue with too much copper in your
> diet is that it competes with zinc absorption.
>
> Here's a good summary reference on copper in humans:
>
>
http://www.science.edu.sg/ssc/detail...ent=4&cat= 49
>
> Copper is an essential metal and the daily requirement has been
> estimated at 30 micrograms/kg of body weight for an adult. Copper acts
> as a catalyst in the formation of haemoglobin, the oxygen-carrying blood
> component. Copper is stored in the liver and excreted in bile salts.
Your numbers had me worried so I checked my vitamin bottle again. It still
says 3 mg of copper is 150% of the MDR, so I looked at your numbers more
carefully.
From above......for a 150 pound person, 30 micrograms/ kg of body weight is
roughly equal to
150 # / 2.2 #/kg = 68 kilograms
68 kg X 0.000030 gr/ kg = .002 grams or (2 mg of copper as minimum daily
requirement).
..003 /.002 = 150% of the minimum daily requirement.
So, the label on my vitamin bottle seems to be reasonable and I wonder how
TTB arrived at 0.5 PPM as the limit for commercial wines.
In any event, thank you for a great post Gene.
Lum
snip........