To heal people, atleast Adam's blood, does not need to be mixed with anything. (See the episode where Adam heals Nathan's Burns)
Claire's blood has been used to heal Sylar, Maya, and Noah.
As far as we know, the blood was only mixed with anything with Sylar and Maya. And in these cases the only reason it seems to be mixed is to act as a cure for the Shanti Virus, and that is mixed with Mohinders blood and what ever else is needed to develop a cure (its something because Mohinders blood only haults the virus progress, remember when he first met Molly)
Yeah and I remember something about Mohinder saying something about being AB as well, but I think they also said that the thing that kills the virus is an antibody in his blood, so there could be some form of extration for the antibody, and Molly could be the only other one with AB blood we know about. But yeah I dont know too much about this kind of stuff
As with Noah and any one else who has been or will be healed by the blood, I think its safe to assume that just the pure blood infusion would heal something.
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I just hope that the issue with the virus was solved. I dunno, but I have just had the feeling Peter wasnt the one who was involved in the Outbreak and I think that the writers strike lead to that being the case, no time for plot development (like when everyone thought Sylar was the bomb), I dunno, they made a big fuss about the virus being incurable, and if it was as easy doing some work with Claires Blood and Mohinders, why couldnt a cure be developed after the outbreak? Because the Cure was developed before the outbreak.