Abstract
ABSTRACT The visual effects of oven- and freeze-drying on Echinacea purpurea herb were assessed by image analysis. Aerial parts of full-bloom plants were chopped by hand and randomly allocated to four drying conditions: freeze-drying and oven-drying at 40, 60, and 80°C. Significant differences in various physical traits of the ligulate flowers (level of red, green, blue and gray colors) and the stems (level of red, green, blue and gray colors and the ratio of brown: green color) were observed among the tested drying conditions. Some of the traits appeared to have potential for use as visual markers to surmise the drying environment of echinacea.
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