Here is an example of the semi-quantification of the eight catechin components contained in green tea.
The Corona Charged Aerosol Detector (CAD) shows almost identical area values for different components if they are at the same concentration under the same analytical conditions. In gradient separation, the organic solvent composition when each component reaches the detector differs, leading to changes in sensitivity; however, this can be corrected using a reverse gradient system. Semi-quantification can be performed using calibration curves created from different components, allowing for the estimation of the quantity of components without standard samples.
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