RP-HPLC method for the analysis and quantification of pancreatin active pharmaceutical agents
Disclosed is a method for the separation, identification and quantification of multiple proteins in pancreatin active pharmaceutical ingredient samples.
1. A method for separating and characterizing proteins in a pancreatin sample comprising:
a) treating a pancreatin sample with a solvent to afford a soluble protein sample;
b) fractionating the soluble protein sample using reverse phase-high performance liquid chromatography (RP-HPLC), the RP-HPLC performed on a C 4 column, wherein the C 4 column is selected from a group consisting of a Vydac 214MS54, 250×4.6 mm, 5 micron column and a water BEH C4, 250×4.6 mm, 3.5 micron column; and wherein the solvent is acetonitrile containing 0.1% trifluoroacetic acid (TFA), the solvent used to elute the fractionated proteins;
c) collecting each of the fractionated proteins individually; and
d) characterizing each of the fractionated proteins using MALDI-TOF-MS.
2. The method according to claim 1 , wherein the fractionated proteins are characterized by determining molecular weights of said fractionated proteins using SDS-PAGE.
3. The method according to claim 2 , wherein further characterization of the fractionated proteins is performed by Western Blot.
4. The method according to claim 2 , wherein further characterization of the fractionated proteins is performed by MALDI-TOF-TOF MS.
5. The method according to claim 4 , wherein MALDI-TOF-TOF MS determines both accurate peptide mass and peptide sequences of the fractionated proteins.
6. The method according to claim 1 , wherein the fractionated proteins are characterized by co-chromatography, the pancreatin sample spiked with commercially-available standards of porcine enzymes, each commercially-available standard of porcine enzyme co-eluting with the fractionated protein identical to it.
7. The method according to claim 6 , wherein analysis of the RP-HPLC results in twenty-five major protein peaks.
8. The method according to claim 7 , wherein the enzymes are PLA2, lipase, trypsin, elastase, chymotrypsin, Carboxypeptidase-A (CPA), carboxypeptidase-B (CPB) and amylase.
9. The method according to claim 8 , wherein PLA2 co-elutes with RP-HPLC peaks 1 and 2, lipase co-elutes with peak 3, trypsin co-elutes with peaks 4-7, elastase co-elutes with peak 15 and amylase co-elutes with peak 19.
10. The method according to claim 1 , wherein the eluted proteins are detected at 280 nm.
11. The method according to claim 1 , wherein MALDI-TOF-TOF MS determines both accurate peptide mass and peptide sequences of the fractionated proteins.