Characteristic Extract A Extract B Extract C Extract D Density at 20°C (mean ±SD) 1.003 g/ml 1.002 g/ml  1.036  0.973 Total dry weight 8.80% 8.40%  13.97% 14.65% Gallic acid equivalents (GAE)(mg GAE/g dry weight) 28 26  10.83  11.73

Table 1: Characteristics of different Calendula officinalis extracts.