A slightly modified version of the method of Singleton et al. was used. (10 ). A 50 milligram quantity of each test compound was dissolved in either water or ethanol, dependent upon solubility. For compounds suspected of having high reactivity, the following dilutions were made: 1:10, 1:20, 1:30, 1:50, 1:100. For compounds suspected of having low reactivity the dilutions made were 1:5, 2:5, 3:5 and 4:5. Cuvettes were prepared such that there were three replicates for each of the dilutions mentioned above. To each cuvette was added 1.58 mL water. 0.1 mL F-C reagent and 20 uL of the proper dilution of test compound. Cuvettes were stirred and allowed to stand 5 minutes. After this, 0.3 mL of a 20% aqueous sodium carbonate solution was added to each cuvette. Cuvettes were again stirred and incubated at 45°C for 30 minutes in a dry bath. Absorbances were read at 765 nm using a Bio-Rad Smart Spec 3000 spectrophotometer. Graphs of absorbance versus concentration were prepared using Sigma Plot software. Activity of compounds is expressed in terms of Gallic Acid Equivalents (GAE). GAE is defined as slope of test compound standard curve / slope of gallic acid standard curve.