Para-nitrophenyl Phosphate as a Substrate for Some Acid Phosphatases in Roots of Vicia faba

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Abstract
A cytochemical and biochemical study of acid phosphatases in roots of Vicia faba using p-nitrophenylphosphate(p-NPP) as substrate has shown the lack of specificity of the substrate which can be acted upon by a K+-activated acyl phosphatase, nucleotide pyrophosphatase, glucox-6-phosphatase, 5′ (3′)-ribonucleotide phosphohydrolase, nucleotide phosph-transferase and those acid phosphatases demonstrable with β-glycerophosphate. It is suggested that care should be taken in the interpretation of both biochemical and cytochemical studies employing such a non-specific substrate as P-NPP.

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