Trypsin[2]

Updated: 2026-09-15

Overview

Trypsin is a pancreatic serine protease that cleaves peptide bonds at the carboxyl side of lysine and arginine residues. First isolated in 1876 by Wilhelm Kühne, it plays critical roles in digestive physiology and laboratory applications. The enzyme is commercially extracted from porcine or bovine pancreas, though recombinant forms are increasingly available. In industrial contexts, trypsin is supplied as lyophilized powder or stabilized solutions. Activity is standardized in USP units or BAEE units, with research-grade purity typically >90%. Its specificity makes it indispensable for protein chemistry studies and biopharmaceutical production processes.

Physical and Chemical Properties

Trypsin exhibits optimal activity between pH 7-9 at 37°C, with rapid denaturation at extreme pH or temperatures above 60°C. The enzyme requires calcium ions for stability and is reversibly inhibited by EDTA. Commercial preparations often contain stabilizers like calcium chloride to prevent autolysis. The crystalline form is hygroscopic, requiring desiccated storage. Solutions are typically prepared in 1mM HCl or Tris buffers. Activity is measured using synthetic substrates like BAEE (Nα-Benzoyl-L-arginine ethyl ester), with one unit hydrolyzing 1μmol BAEE per minute at 25°C.

Main Applications

In biotechnology, trypsin is primarily used for cell dissociation in culture workflows, particularly for adherent mammalian cells. The 0.25% trypsin-EDTA solution is an industry standard for subculturing. Pharmaceutical applications include insulin production through proinsulin conversion and wound care products for enzymatic debridement. Proteomics laboratories employ trypsin for mass spectrometry sample preparation due to its predictable cleavage pattern. Food industries utilize it for protein hydrolysate production. Recent medical applications explore trypsin coatings for anti-thrombogenic medical devices.

Safety and Storage

As a protein-digesting enzyme, trypsin requires careful handling to prevent tissue damage. Powder forms may cause respiratory sensitization - always use fume hoods during reconstitution. Eye protection and nitrile gloves are mandatory. Spills should be neutralized with 1M NaOH before water rinsing. Lyophilized material remains stable for 3 years at 2-8°C when kept dry. Solutions lose activity within weeks at 4°C; aliquot and store at -20°C for long-term use. Avoid repeated freeze-thaw cycles. Sterile-filter through 0.22μm membranes for cell culture applications.

B2B Procurement Guide

Industrial buyers should specify: 1) Source (porcine/bovine/recombinant) 2) Activity (typically 1,000-5,000 USP/mg) 3) Endotoxin levels (<1EU/mg for cell culture) 4) Sterility requirements. Bulk orders (1kg+) may offer 30-50% cost savings but require validation of batch consistency. Leading manufacturers include Sigma-Aldrich, Thermo Fisher, and Worthington Biochemical. For GMP applications, request DMF (Drug Master File) documentation. Consider recombinant alternatives (e.g., TrypLE) for regulatory-sensitive uses. MOQs typically start at 100g for research-grade material.