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P4762 Sigma-Aldrich

Papain from papaya latex

lyophilized powder, ≥10 units/mg protein

Synonym: Papainase



General description

Papain is a cysteine protease, found in Carica papaya. It is composed of a single polypeptide chain containing three disulfide bridges and a sulfhydryl group.


Papain from papaya latex has also been used:
• in the enzyme cocktail for dissociating human fetal retinal tissue
• to digest chondrocytes/scaffold cultures for total DNA quantification for cell proliferation
• as a supplement in neurobasal medium to produce retinal cell suspensions

Papain, product P4762 from papaya latex, has been used to digest carotid artery smooth muscle cells. Papain is used in dissecting solutions. It is used to produce Fab fragments of antibodies. It is used for cell dissociation since it has been shown to be more effective and less damaging with certain tissues.

Used to produce Fab fragments of antibodies. Also used for cell dissociation since it has been shown to be more effective and less damaging with certain tissues.


1, 5 g in glass bottle

50, 100, 500 mg in glass bottle

25 mg in poly bottle

Package size based on protein content

Biochem/physiol Actions

Papain with wide specificity, cleaves peptide bonds of basic amino acids, leucine or glycine. It also hydrolyzes esters and amides. Papain is considered to digest protein substrates more broadly than the pancreatic proteases. Papain is commonly used in cell isolation procedures as it is highly efficient and less harmful than other proteases on certain tissues. The use of papain is known to yield more viable smooth muscle cells, retaining the cell′s sensitivity to stimulants.

A cysteine protease that cleaves peptide bonds of basic amino acids, leucine, or glycine.
pH optimum 6.0-7.0
Also hydrolyzes esters and amides.

Unit Definition

One unit will hydrolyze 1.0 micromole of N-alpha-benzoyl-L-arginine ethyl ester (BAEE) per minute at pH 6.2 at 25 deg C.

Physical form

Lyophilized powder containing sodium acetate

Preparation Note

2× Crystallized

Other Notes

View more information on papain at www.sigma-aldrich.com/enzymeexplorer.

Safety & Documentation

Safety Information

Signal word 
Hazard statements 
Precautionary statements 
Target organs 
Respiratory system
Personal Protective Equipment 
NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Protocols & Articles


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Peer-Reviewed Papers


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