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Table 3 Comparison of EC50s of a range of plant extracts known to contain cysteine proteinase activity

From: Developing novel anthelmintics from plant cysteine proteinases

Enzyme EC50(μM)
Milkweed latex extract 3
Ficin 5
Pineapple fruit extract 5
Chymopapain 7.5
Papain 7.5
Crude papaya latex 12.5
Stem bromelain 75
Ficus benjamina latex 140
Ficus carica latex 150
Kiwi fruit extract None
  1. All values are in micromolar concentrations of enzyme activity, as determined by active site titration, that caused 50% reduction in motility after 90 minutes of incubation with H. bakeri