Posted 11 January 2013 - 02:46 PM
"Pristine" is jargon that's common in the c60 community. It just means unsubstituted. "Substituted" means that another atom or group of atoms is bonded to the c60 molecule. The word "substituted" is really a misnomer, but it's a holdover from the rest of organic chemistry where carbon compounds always have hydrogens attached to them, at least somewhere on the molecule. Many of the reactions of organic chemistry involve substituting something else for one of the hydrogens. They're called substitution reactions, and the thing that gets attached (substituted) is called a "substituent". C60, as it happens, doesn't have any hydrogen atoms. It's pure carbon. Graphite and diamond are other forms of pure carbon. Charcoal or coal is yet another, having a mixture of the types of bonding seen in graphite and diamond.
The c60 that we buy from various suppliers is pure "pristine" c60 (mostly pure, anyway...) that shouldn't have anything attached to it. When we mix it with olive oil, it doesn't just dissolve, it reacts with the olive oil, forming a new compound. The sort of reactions that occur between olive oil and c60 are called "addition" reactions, and the thing that gets added to the c60, in this case the hydrocarbon tail of a fatty acid, is called an "adduct". I suspect that the most common product is a c60 with two fatty acids attached, which we would call a "bis-adduct". (other counts would be mono-, tris-, and tetrakis-)
The solubility of pristine c60 in olive oil is low; far less than the 0.8-0.9mg/ml of total c60 content that we get with c60-oo. Since it reacts with the olive oil, the amount of pristine c60 in the final product is likely to be miniscule. One reason that we are unlikely to be affecting nucleic acids is that there are other things attached to our c60, which would prevent them from getting close to the DNA. Another reason, noted by James above, is that c60 and its adducts are hydrophobic, and localize in membranes and fat depots, while nucleic acids are hydrophilic and are only found in aqueous environments.
For what it's worth, 2012 is not the first year that humans started eating c60. We've been exposed to c60 ever since we discovered fire, since c60 is a small constituent of soot. If you barbecue a piece of meat, which contains triglycerides with the same oleic acid units that are found (in higher percentages) in olive oil, you are likely to get a very tiny amount of a c60-fatty acid adduct. You'll also get a lot of other junk that you don't want. Cigarette smoking is a similar situation- mostly junk that harms you, but you're also inhaling a tiny amount of c60. Just not enough to make up for the rest of the smoke.
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