Abstract
ACETONE-HYDROCHLORIC acid has been widely used to split haemoproteins, including cytochromes of the a type which contain formyl substituents in their prosthetic groups. Results reported below show that formyl porphyrins and haemins react with acetone-hydrochloric acid, and hence it is necessary to exercise caution in the use of this reagent. Fortunately the reaction between formyl porphyrins and acetone-hydrochloric acid is a slow one (48–72 hr. being necessary for complete conversion at room temperature) so that if the temperature is kept low and only a relatively short time is allowed for cleavage of haemoprotein the amount of alteration of a formyl group is negligible.
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