HI. A while back I have used an RIA for oxytocin. I think it was GE healthcare but used to be ICN Biomedical. For AVP you might try Cayman. Also, another favorite kit company of mine is Arbor Assays out of Michigan. I like their kits and tech line.

F D Tingley

Thank you Francis! That was very hepful. Do you assay these neuropeptides in brain tissue or plasma?

It was a long time ago, I do not recall. It may have been both but at least plasma. Please check out the online protocols for these assays. They will list the viable sample types.

Hi. I used Cayman and ALPCO Elisa kits for vasopressin and both were good.

It is interesting that neuropetide Y, oxytocin and vasopressin receptors are present also in Humans (please see file; The Fascio effect). Interestingly, thiol-type human serum biotinidase/enkephalin aminoexopeptidase is working as the metabolizing enzyme of the neuropeptides in Humans (please see file; Enk serumBIN). Further, brain lipoamidase (from pig brain) has also aminoexopeptidase activity (please see file; Multiple hydrolase LIP).

Then, our aminoexopeptidase data suggest that neuropeptide Y and substance P are not present in Humans.

Then, neuropeptide Y receptor and substance P receptor of Humans may be handling another neuropeptides.

Please, do not use notorious ELISA and/or RIA method, which give c.a. 2,000-fold low values than quantitative PDMD method (please see files; HepG2 Fucoidan and JMBT alopecia).