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Glucose-6-phosphatase activity demonstrated by a cerium-diaminobenzidine method.

The well-established method for light microscopic demonstration of glucose6-phosphatase (G6Pase) activity using lead salts (2,6,9) provides high local precision and reproducibility. Such histochemical assessments of hepatic G6Pase activity helped establish the hypothesis of metabolic zonation of liver parenchyma (5). Therefore, when a new, alternative method for detection of G6Pase activity is presented, high demands on its superiority need to be met. In a recent article, Jonges et al. (4) described such a new technique, the “cenium-diaminobenzidine method,” which in our view is a step back when compared with the lead method. Moreover, its use does not meet fundamental requirements of biochemistry.