## 4 Conclusions  
UV-Vis spectroscopic methods for the prediction of the TPC of medicinal plants extracts can be improved by adjusting the reagent concentration, pH, reaction time, temperature,  
Figure 4: UV-Vis absorbance curve of the plant extracts at the different indicated concentrations: (**a**) _Senna alexandrina_, (**b**) _Myrtus communis_ L. (Leaf), (**c**) _Silbyum marianum_ L. (Flower), (**d**) _Silbyum marianum_ L. (Leaf), and (**e**) _Rosa moschata_ L. (Flower). \begin{table}
\begin{tabular}{l c c c} \hline \hline \multirow{2}{*}{**Samples**} & \multicolumn{3}{c}{**TPC (mg GAE/g DW)**} & \multirow{2}{*}{**Recovery \%**} \\ \cline{2-3}  & **Method (ODMT)** & & **Method (FC)** \\ \hline _Daucus carota_ L. root & 48.71 \(\pm\) 7.60 & 51.10 \(\pm\) 17.56 & 95.32 \\ _Ruta Chalepensis_ L. Leaves & 57.66 \(\pm\) 12.56 & 54.94 \(\pm\) 20.86 & 104.95 \\ _Anisosciatium_ DC. Leaves & 46.59 \(\pm\) 3.69 & 44.67 \(\pm\) 1.10 & 104.29 \\ _Thymus vulgaris_ L. Leaves & 144.73 \(\pm\) 29.82 & 141.8 \(\pm\) 2.86 & 102.06 \\ _Senna alexandrina_ leaves & 46.26 \(\pm\) 7.93 & 45.14 \(\pm\) 2.84 & 102.48 \\ _Myrtus communis_ L. Leaves & 337.61 \(\pm\) 26.99 & 334.7 \(\pm\) 15.17 & 100.86 \\ _Silbyum Marianum_ L. Flower & 45.41 \(\pm\) 4.51 & 44.23 \(\pm\) 2.89 & 102.66 \\ _Silbyum Marianum_ L. Leaves & 64.19 \(\pm\) 11.10 & 64.73 \(\pm\) 17.59 & 99.16 \\ _Rosa moschata_ Flower & 250.38 \(\pm\) 4.45 & 258.59 \(\pm\) 8.29 & 96.82 \\ \hline \hline \end{tabular}  
* Recovery % = [Conc given by Method (ODMT)]/Conc given by Method (ODMT)] \(\times\) 100.  
\end{table} 
Table 3: Comparison of total polyphenol content (TPC) in different plants by Orange Data Mining Tool (ODMT) and Folin–Cicolaletu method (FC) used as the reference method. Data are expressed in terms of the gallic acid equivalent (GAE) in mg/g dry weight (DW) of the plant extract. and absorption wavelength. Herein, we developed an accurate UV-Vis spectrophotometric-ODMT method for the determination of TPC in nine medicinal plant extracts. The method used very small amounts of reagents (required a maximum of 1 mg of GA reagent and only 1 mg of the plant extract). The determination of TPC by the newly suggested method is based on creating a database (standard calibration curve) associated with the GA reagent and ODMT. Interestingly, TPC obtained by the standard calibration curve obtained using the Folin-Ciocalteu method (GAE) (in mg/g of the DW plant extract) are in agreement with the results predicted by the ODMT. The proposed ODMT method linear dynamic concentration ranges from 44.67 to 334.7 mg GAE/g of DW plant extract with a recovery percentage range of 95.3% to 104.3%. Therefore, from this research, it can be said that the value of polyphenols can be predicted in any plant in the future, and as mentioned in the introduction, the TPC can be predicted and apply to all medicinal plants using the new ODMT method. Conceptualization. S.E.L. F.G., S.M. and A.B. ([PERSON]) and A.B. ([PERSON]); methodology. A.B. ([PERSON]), A.B. ([PERSON]), S.M. and F.M. ; software. F.G. and A.B. ([PERSON]); validation. A.B. ([PERSON]), F.G, A.T., K.A.M., S.A.A., F.M. and A.B. ([PERSON]); formal analysis. S.E.L., A.R., A.T., K.A.M., S.A.A., F.M. and F.G.; investigation. A.B. ([PERSON]), and F.M. ; _resources_. A.R., and F.M. ; data curation. S.E.L., A.T. K.A.M., S.A.A. and F.M. ; writing--original draft preparation. F.G., A.B. ([PERSON]), S.M. and A.B. ([PERSON]); writing--review, and editing. F.G., A.B. ([PERSON]). [PERSON]. ([PERSON]), S.M., A.T., K.A.M., S.A.A. and F.M. ; supervision. S.E.L., A.R. and F.M. Submission. F.M. All authors have read and agreed to the published version of the manuscript. The authors did not receive any external funds for this project. This article does not contain any studies with human participants or animals performed by any of the authors. Not applicable. F.M. thank Fluorotronics, Inc/California Innovations Corporation, a pioneered company in optical and nanooptical devices and applications, for its technical support.