What is Papain?
Papain is a powerful proteolytic enzyme—meaning it breaks down proteins—extracted from the raw fruit of the papaya plant (Carica papaya). It is often referred to as a “protein digestant” because of its ability to cleave peptide bonds.
Key Characteristics
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Source: It is primarily harvested from the latex (the milky sap) of unripe green papayas.
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Structure: It consists of a single polypeptide chain with 212 amino acids. Its activity relies on a specific “thiol” group, which is why it’s classified as a cysteine protease.
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Resilience: Unlike many enzymes, papain is remarkably heat-resistant and functions across a wide pH range, making it highly versatile for industrial use.
Common Applications
Because it is so effective at dismantling tough protein structures, papain is used in several diverse fields:
