The oxidation of phenylacetaldehyde by plant saps

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Abstract
Many plant saps oxidize phenylacetaldehyde. The system in pea-seedling sap consists of a thermolabile factor which appears to be a peroxidase and a thermostable factor which can be partially replaced by manganous ions. A system with similar properties to that in pea-seedling sap can be constructed using horseradish-peroxidase preparations and managanous ions. The oxidation, when catalyzed by either pea-seedling sap or horseradish peroxidase and manganous ions, proceeds with the formation of benzaldehyde and formic acid.