Re: destroying magnesium with light

[Guest guest]

> This came up here a while back where I'd read magnesium

> was destroyed in milk that was in clear containers.

> The fluorescent lights were the culprit. This is known as waxed

> cardboard half gallons list magnesium in the nutrition panel

> and clears don't have it.

Hi Wanita:

Please tell me how the magnesium is destroyed by light.

Chi

[Guest guest]

At 11:42 PM 5/5/02 +0000, you wrote:

>

>> This came up here a while back where I'd read magnesium

>> was destroyed in milk that was in clear containers.

>> The fluorescent lights were the culprit. This is known as waxed

>> cardboard half gallons list magnesium in the nutrition panel

>> and clears don't have it.

>

>Hi Wanita:

>Please tell me how the magnesium is destroyed by light.

>Chi

>

Hi Chi,

Alec said its the fluorescent wavelength emissions. What I read didn't say

other than it was so, so I checked the containers. In our previous discussion

Dennis, who does food lab analysis felt that magnesium was unstable enough for

it to be fluorescent light sensitive. Remember the first grocery stores here

being kind of dark near dairy but that was before fluorescent lighting.

Think I

see where you're going to. What does the light do to vegetable's magnesium

content as they're wide open to light?

Wanita

[Guest guest]

> >> This came up here a while back where I'd read magnesium

> >> was destroyed in milk that was in clear containers.

> >> The fluorescent lights were the culprit. This is known as waxed

> >> cardboard half gallons list magnesium in the nutrition panel

> >> and clears don't have it.

> >

> >Hi Wanita:

> >Please tell me how the magnesium is destroyed by light.

> >Chi

> >

> Hi Chi,

> Alec said its the fluorescent wavelength emissions. What I read

didn't say

> other than it was so, so I checked the containers. In our previous

discussion

> Dennis, who does food lab analysis felt that magnesium was unstable

enough for

> it to be fluorescent light sensitive. Remember the first grocery

stores here

> being kind of dark near dairy but that was before fluorescent

lighting.

> Think I

> see where you're going to. What does the light do to vegetable's

magnesium

> content as they're wide open to light?

> Wanita

Wanita I was involved in the magnesium (Mg) discussion relative to

digestion of cellulose in wheatgrass. I indicated Mg is present in

chlorophyll molecule and I went along with the above thought because

light destroys chlorophyll. My reasoning being cut green grass

doesn't stay green very long. So it's reactive in light. That

wouldn't be elemental Mg but molecular Mg that I was referring to(in

chlorophyll).......Now that I'm considering Mg in milk I'm wondering

what form of Mg would be in milk. It wouldn't be elemental. It

would be a salt I suppose. Like Mg Phosphate or something. The Merck

Index indicates Mg (elemental) slowly oxidizes in moist air so it is

reactive. Anyone know what compound/molecule of Mg would be in milk.

Sorry for the confusion. Dennis

[Guest guest]

>From: " dkemnitz2000 " <dkemnitz2000@...>

>Now that I'm considering Mg in milk I'm wondering

>what form of Mg would be in milk. It wouldn't be elemental. It

>would be a salt I suppose. Like Mg Phosphate or something. The Merck

>Index indicates Mg (elemental) slowly oxidizes in moist air so it is

>reactive. Anyone know what compound/molecule of Mg would be in milk.

If Magnesium is present in milk as a salt, then it must already be oxidized,

since the metals in salts are oxidized by definition. Also, the salt would

have to be dissolved (otherwise it would sink to the bottom), so the

Magnesium ions would be floating around by themselves.

I can only think of two reasons why light might " destroy " the Magnesium in

milk. The first is the one that's already been expressed--that it might be

in some organic compound which could be changed into another compound which

would make the Magnesium inaccessible, but I think this unlikely.

Alternatively, I've seen it claimed that calciferol, the form of vitamin D

added to processed milk, binds to Magnesium, preventing its absorption. It

could be that light provides the energy necessary for this reaction to take

place. Of course, this wouldn't be an issue with raw milk.

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[Guest guest]

> >From: " dkemnitz2000 " <dkemnitz2000@y...>

>

> >Now that I'm considering Mg in milk I'm wondering

> >what form of Mg would be in milk. It wouldn't be elemental. It

> >would be a salt I suppose. Like Mg Phosphate or something. The

Merck

> >Index indicates Mg (elemental) slowly oxidizes in moist air so it

is

> >reactive. Anyone know what compound/molecule of Mg would be in

milk.

>

> If Magnesium is present in milk as a salt, then it must already be

oxidized,

> since the metals in salts are oxidized by definition. Also, the salt

would

> have to be dissolved (otherwise it would sink to the bottom), so the

> Magnesium ions would be floating around by themselves.

>

> I can only think of two reasons why light might " destroy " the

Magnesium in

> milk. The first is the one that's already been expressed--that it

might be

> in some organic compound which could be changed into another

compound which

> would make the Magnesium inaccessible, but I think this unlikely.

> Alternatively, I've seen it claimed that calciferol, the form of

vitamin D

> added to processed milk, binds to Magnesium, preventing its

absorption. It

> could be that light provides the energy necessary for this reaction

to take

> place. Of course, this wouldn't be an issue with raw milk.

>

have you had kinetics? I took physical chem about 1/2

semester. It wasn't required for my major so about 1/2 way thru the

semester I dropped. Kinetics are awesome but I know little about this

Mg in milk reaction. Anyway the reaction goes both ways so there

probably could be ionized Mg. I don't know so I want you all to know

up front this is a guess on my part. Dennis

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