ABSTRACT
@#Objective To prepare the 1st batch of national standard of recombinant trypsin in order to standardize and improve the quality of recombinant trypsin.Methods Enzyme-substrate identification,HPLC identification,N-terminal sequencing and TOF-MS were used to confirm the property and structure of recombinant trypsin;the purity was determined by HPLC;according to the methods in Chinese Pharmacopoeia(Volume Ⅲ 3603,2020 edition),the specific activity of the candidate standard was determined,and the stability and uniformity were investigated.Results The structure of recombinant trypsin was confirmed,and the specific activity of the 1 st batch of national standard of recombinant trypsin was 5 169 U/mg,containing 80% β-trypsin and 9% α-trypsin.The RSD of purity of α,β-trypsin and retention time of 12 candidate standards were all less than 2.0%.The purity of α,β-trypsin showed no obvious decrease stored at 25 ℃ and relative humidity(RH) 80% for 10 d,while the purity of β-trypsin decreased slightly and the purity of α-trypsin increased slightly stored at 40℃ and RH 80% for 10 d.The purity of β-trypsin decreased slightly when exposed to light(4 000 lx) for 10 d.Conclusion The national standard of recombinant trypsin with accurate structure and high purity was prepared,which can be used for system suitability test of the purity determination.