Abstract
An effective, robust, and inexpensive grinding device for the grinding of herb samples like bark and roots was developed by rebuilding a commercially available coffee grinder. The grinder was constructed to be able to provide various particle sizes, to be easy to clean, and to have a minimum of dead volume. The recovery of the sample when grinding as little as 50 mg of crude Cinchona bark was about 60%.Grinding is performed in seconds with no rise in temperature, and the grinder is easily disassembled to be cleaned. The influence of the particle size of the obtained powders on the recovery of analytes in extracts of Cinchona bark was investigated using HPLC.
Highlights
Sample preparation is an important first step in the chemical analysis of constituents in herbs
The grinding of herbal samples like bark and roots into a fine powder is necessary in order to obtain more homogeneous samples, which again will result in more reliable analytical data
The recovery of the ground sample was investigated by grinding different amounts of the same Cinchona bark and by weighing the collected powder (Table 1)
Summary
Sample preparation is an important first step in the chemical analysis of constituents in herbs. The grinding of herbal samples like bark and roots into a fine powder is necessary in order to obtain more homogeneous samples, which again will result in more reliable analytical data. It is described how to modify a commercial coffee grinder into an effective and robust device that is able to handle and grind bark or root samples as small as 50 mg with a good recovery.
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