Abstract
Catalase activity is observed in almost all kind of plant material as far as it has been investigated.The amount of catalase, however, is very low and the extracted enzyme solution very unstable, compared with that of animals.From these reasons, the plant catalase has not yet been crystallized.Now, we have succeeded in crystallizing the catalase extracted from both spinach and rice-plant leaves, by the application of the butanol-treatment to extract this from chloroplasts.The crystal obtained has the same absorption spectrum as that of animal, and therefore it seems that plant catalase also has haemin as its prosthetic group.Judging from their optimum temperatures, the protein part of both catalases seem to differ and each have a suitable optimum temperature in order to make its enzyme activity the highest in the circumstance where it grows.
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