[Short peptide fragments with antiulcer activity from a collagen hydrolysate].

A peptide acidic hydrolysate of collagen (PHC) was obtained under conditions (4 N HCl) ensuring the predominant formation of short peptides, glyprolines. They were separated and their antiulcer activity was studied. Thirty individual peptides with molecular masses of 174-420 amu were isolated from the PHC by HPLC.

[Comparative study of azithromycin pharmacokinetics in healthy volunteers in open cross randomized procedure].

A method of quantitative determination of azithromycin in HPLC with mass spectrometric detection was developed. The detection limit is 0.5 ng/ml.