| Aluminium concentrations were measured by absorbance spectrophotometry using the catechol method. |
| Similarly, the peroxidase activity was assayed from the oxidation of catechol by H 2 O 2 in presence of the extract. |
| Unfortunately for EU exporters of catechol this resulted in an increase in the margins. |
| Of these the catechins are the most typical, and have been considered as the parent substances of the catechol tans. |
| So the problem was how to change this catechol without affecting the drug's ability to interact at the receptor. |
| Xanthin and catechol browns are pleasing in appearance, but their effect is less rich than that obtained with potash. |
