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Trypsin inhibitor from Phaseolus limensis (lima bean)

Type II-L, crude powder

Trypsin Inhibitor from lima beans
CAS Number:
EC Number:
MDL number:

biological source

Phaseolus limensis (lima bean)

Quality Level


Type II-L


crude powder

mol wt

9 kDa


0.067 M sodium phosphate buffer, pH 7.6: 1 mg/mL

storage temp.


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Trypsin inhibitor from Phaseolus limensis (lima bean) has been used:
  • in the inhibition of trypsin in human plasma
  • in the termination of proteolytic digestion in rabbit skeletal muscles
  • in the inhibition of salivary glands enzyme extract from Lygus lineolaris
  • in the inhibition of proteolytic activity in Agave tequilana enzyme extract

Trypsin inhibitor has been used as an affinity ligand for isolation of elastase-type enzymes.


100, 500 mg in glass bottle
1 g in glass bottle

Biochem/physiol Actions

Trypsin inhibitor from lima beans belongs to Bowman-Birk family of protease inhibitors. It is 9 kDa in molecular weight and contains nine disulfide bridges and is highly thermostable. It has trypsin and chymotrypsin binding subdomains.

Physical properties

Monomer has an apparent molecular weight of approx. 9,000 Da but undergoes a concentration and pH-dependent dimerization.

Unit Definition

One trypsin unit will produce a ΔA253 of 0.001 per min with BAEE as substrate at pH 7.6 at 25 °C; reaction volume 3.2 mL, 1 cm light path.

Preparation Note

Prepared by a modification of the method of Tauber, H., et al., J. Biol. Chem., 179, 1155 (1949) (modified).

Analysis Note

One mg will inhibit ≥0.8 mg of trypsin with activity of approx. 10,000 BAEE units per mg protein.

Other Notes

View more information on Trypsin Inhibitor.


Health hazard

Signal Word


Hazard Statements

Hazard Classifications

Resp. Sens. 1 - Skin Sens. 1

Storage Class Code

11 - Combustible Solids



Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificate of Analysis

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Certificate of Origin

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Product Information Sheet

Technical Information

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