I carried out an assay of condensed tannins from extracts of leaves and stems of my plant I found for extracts from ultrasound-assisted extraction that the content of condensed tannins of the leaves is higher than that of the stems . and for the maceration extracts I found the opposite. The content of condensed tannins at the stems was higher than that of the leaves. how can we interpret these results please ??
* All my samples are methanolic extract
Check https://academic.oup.com/aobpla/article/10/4/ply044/5057052
Also check https://www.eolss.net/sample-chapters/c03/E6-79a-14.pdf
It could be due to sunshine exposure. Look at this paper.
Article Selected Secondary Metabolites and Antioxidant Activity of K...
your result is good; tanins are polymers and they are highly presented in stems not in leaves; if you get the reverse then you should check your experiments. In addition to sure of your results; I suggest you to search about your plant deeply to find good papers
Good luck
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