Hi
This is a standard calculation method used in pharmacognosy, phytochemistry, and natural product research.
It has evolved as a conventional metric for evaluating the efficiency of extraction procedures. The method likely originated in early pharmacognosy and phytochemical literature in the 19th or early 20th century, especially in herbal medicine and pharmaceutical sciences.
It has been widely cited in standard texts such as Pharmacognosy by Trease and Evans, Practical Pharmacognosy by K.R. Khandelwal, Quality Control Methods for Medicinal Plant Materials by WHO.
You can cite this literature in your articles
Thank you
@ Abderrahmane Hammouda
The formula is not attributed to any specific individual. It is a standard fomular used in pharmacognosy and natural product chemistry
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