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Offline Cymric

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Re: Diet Cherry Coke
« on: July 12, 2006, 11:39:53 AM »
These days, I'm partial to a Diet Lime Coke, which is nice and refreshing. Personally, I am the exact opposite of T-bone: I can't stand the sweetness of regular soft drinks; if anything they make me more thirsty. For my regular intake of fluids, I use mostly water: cheap, just plain H2O without additives, and quenches the thirst fastest because of the osmotic pressure difference between it and my body fluids :-P.
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Offline Cymric

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Re: Diet Cherry Coke
« Reply #1 on: July 12, 2006, 08:16:51 PM »
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Karlos wrote:
Having seen first hand the effects of a coca-cola concentrate spillage at the docks of my home town as a child, I have not felt inclined to drink coca cola in any way shape or form.

What happened?

(And while I'm at it, is that rotated black \tau on the right of your hand a fracture? What did you do?)
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Offline Cymric

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Re: Diet Cherry Coke
« Reply #2 on: July 13, 2006, 04:33:37 PM »
@KArlos:

Reminds me of a friend of mine, who likes to point out that orange juice concentrate is handled as a hazardous and toxic chemical, and is shipped in specifically designed ships and containers. The stuff has a pH of about 0.5.
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Offline Cymric

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Re: Diet Cherry Coke
« Reply #3 on: July 14, 2006, 09:23:43 AM »
Okay, okay, superacids rock (has anyone beaten the power of a HSO3F / SbF5 mixture yet?) but that wasn't my point. My point was that a concentrate of purely natural ingredients can be made to have a pH resembling that of battery acid :). Normally you tend to think of 'natural' acids in terms of weak buffers, diluted, not fully ionised, and the like.

Bloodline, what is the pH of pineapple juice concentrate, then? Pineapple on its own doesn't taste all that sour to me.
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Offline Cymric

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Re: Diet Cherry Coke
« Reply #4 on: July 15, 2006, 03:53:41 PM »
Don't overreact---benzene formation isn't that important unless you keep foddstuffs outside of the fridge in full sunlight. Of course, journalists and consumer agencies are quick to remind us that benzene is a carcinogenic substance, should be forbidden, yaddayaddayadda.

Apparently the problems begin with ascorbic acid being able to react with certain metal ions; the resulting species are able to reduce just one electron away from oxygen; these ions then go on to form OH*-radicals which decarboxylise the benzoate ion to benzene. (This page shows the mechanism.) Problem is: benzoic acid is a natural fungicide, present in a number of berries (cranberries, cloud berries) and other fruits.

So now we have the curious situation that we have two ingredients naturally occurring in a lot of plants which are not allowed to be mixed because it produces a chemical which causes cancer on the long term. I daresay the solution is likely going to come from the fact that we shouldn't eat nor drink anything at all.  :roll: Oh, by the way, be careful with feeding your pet cat anything containing benzoic acid or it derivatives: cats have a much lower tolerance towards this chemical than humans.
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Offline Cymric

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Re: Diet Cherry Coke
« Reply #5 on: July 15, 2006, 07:16:49 PM »
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Karlos wrote:
You end up, quite literally with free protons kicking around - it's about 2×10^19 times stronger than 100% sulfuric acid ;-)

Sounds like the blood of a certain type of alien being killed and resurrected on the white screen for about 4 times...
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Offline Cymric

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Re: Diet Cherry Coke
« Reply #6 on: July 25, 2006, 11:35:36 AM »
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Hyperspeed wrote:
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by Cymric:
Don't overreact---benzene formation isn't that important unless you keep foddstuffs outside of the fridge in full sunlight.


[quote[The BBC report didn't mention light as being a significant catalyst - the reaction was taking place in storage. And isn't it precisely when there is bright sunshine that people are going to want to drink Lucozade for refreshment?

It does take place in storage, but much more slowly. Sunlight really provides the 'oompf' for the reaction. Lowering the temperature by 10 degrees cuts the reaction rate in half (old chemist's rule of thumb). But still: it requires a significant amount of sunlight (I recall about a day) before really elevated concentrations of benzene are reached. We're still talking low amounts on an absolute scale, though, and drinking such a bottle of 'spiked' Lucozade won't harm you. Now if you were to ingest gallons upon gallons, yes, then, perhaps.

By the way: I didn't know people stored their drinks in open sunlight... They usually keep them in a bag underneath lots of material so the drink stays cool  :p

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... that bottle you leave on the beach in the afternoon sun... a ticking cancer timebomb!

I think it is about as carcinogenic as walking around in a large city on a hot, sunny afternoon. Phrases like 'ticking cancer timebomb' are nothing but sensational flourish to scare the population.

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(Not to mention new research that suggests the plastics used in the bottle can leak chemicals simular to oestrogen).

Not the phthalate-scare again... This is getting old. The true source of scary phthalates---to make plastic pliable and soft---has been banned from most toys and to my knowledge platics used to store food in. No more source of leaky oestrogenes from that. The second source would be PET, but you need to use really old and really worn bottles (high temperatures, lots of sunlight, lots of agressive liquids, lots of physical stress) in order to coax a little of the material out into the liquid it's containing. It is far likelier that you have a beautiful lining of algae in the bottle long before that happens.

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When you say benzoic acid is present in fruits, does this mean Sodium Benzoate?

Yes. Or another salt, say with potassium or calcium.

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Anyway, the food standards people weren't asking for the Sodium Benzoate to be removed from Lucozade, they wanted the Vitamin C removed for some odd reason. They suggested that there were other opportunities to get this anti-oxidant other than in soft drinks.

That would be a worthwhile suggestion. One of the two chemicals (ascorbic acid or benzoic acid) has to go if you don't want the benzene reaction to occur. It is a bit silly to remove naturally occurring ascorbic acid from fruit juice, but you don't have to exacerbate the problem by adding more.

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In fact, it's either Norway or Sweden has banned Cornflakes as the Vitamin content is deemed a risk to the liver.

Sounds like too much vitamin A or pro-vitamin A, not C. A is known to be a bit of a problem in too high doses: especially pregnant women need to be careful not to overdo it, as it can harm their child. Vitamin C is relatively safe in that regard---at least, I've never heard of any other problem save the benzoic acid one.

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But it's Coca Cola's ability to clean tarnished spoons, patios etc. that should pose the greatest warning. Have you noticed too that everyone who drinks Diet Coke is a fat ass?

I kindly request you not refer to me as a 'fat ass'. According to my girlfriend, my ass is just right: perfect for little slaps and nibbles. I also happen to like my diet Coke quite a lot, thank you very much: it doesn't taste as sweet as regular Coke, and quenches my thirst better because of that.

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(Aspartame has been linked to brain cell death as well!)

What hasn't?

Lately, I've begun switching to water: simple, costs almost nothing, and no health-issues whatsoever.
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Offline Cymric

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Re: Diet Cherry Coke
« Reply #7 on: August 02, 2006, 03:49:17 PM »
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Hyperspeed wrote:
But if Carbon Dioxide has 2x oxygen atoms for every 1x carbon then some kind of splitting of this would be really cool for air recycling.

It costs exactly as much energy to break the bonds as making them freed. And since burning carbon gives off a lot of energy (look at your ordinary stove), you need quite a lot of energy to reverse the process. There's no shortcut, nor shall one ever be found.

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I wonder if anyone will actually crack the problems of perpetual energy, or at least increase energy recycling. If the sun is a chain reaction lasting billions of years then who knows what could be done.

There is no perpetual energy---not even the Sun is perpetual. Besides, what the Sun is doing is nuclear fusion, and that is a completely different (and much more difficult) game. If ITER works as envisaged, then we are (literally) one step away from creating a commercial prototype of a device which at least is capable of sustaining a fusion reaction on its own. Then it's 'just' a matter of extracting that energy. I hope I live long enough to see ITER's successor in operation. Such a device would rank near the top in the Seven World Wonders of modern engineering.

As for more mundane energy conversion processes, tremendous advances have been made in the area of fuel cells. These turn chemical energy directly into electrical energy, instead of going through the wasteful bypass of burning fuel first, and using heat to generate the electrical currents. Unfortunately, in order to use normal fuel to extract the energy out of you require some fancy catalysts which do not tolerate sulphur very well; and if anything is a prerequisite, it is tolerance towards sulphur.
Some people say that cats are sneaky, evil and cruel. True, and they have many other fine qualities as well.