Which type of steroidal saponin commonly found in plants?

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Biswapriya Biswavas Misra

Instead of sterols, you can use saponin from other sources such as Solanine (Sigma) as internal standard for quantification (standard), and quality control for HPLC runs and extraction efficiency etc. as well.

http://www.sigmaaldrich.com/catalog/product/aldrich/s3757?lang=en®ion=US