## 3 Results and Discussion
### Fourier-Transform Infrared Spectroscopy of Synthesized AgNPs  
The FTIR spectroscopy of synthesized AgNPs using the leaves and stems are presented in Figures 8-10, respectively. Prominent peaks were observed for the methanolic leaf \begin{table}
\begin{tabular}{c c c} \hline \hline
**Sample (AgNPs)** & \
\begin{tabular}{c} **Nanoparticle Size (nm)** \\ **(Mean + Standard Error)** \\ \end{tabular} &
\begin{tabular}{c} **Zeta Potential (mV)** \\ **(Mean + Standard Error)** \\ \end{tabular} \\ \hline Methanol leaf & 111.3 \(\pm\) 4.4 & \(-\)33.2 \(\pm\) 0.1 \\ Methanol stem & 110.7 \(\pm\) 4.2 & \(-\)28.2 \(\pm\) 0.0 \\ Fresh leaf & 53.9 \(\pm\) 8.4 & \(-\)8.8 \(\pm\) 0.2 \\ Fresh stem & 37.7 \(\pm\) 0.9 & \(-\)17.2 \(\pm\) 0.0 \\ Powdered leaf & 57.9 \(\pm\) 0.6 & \(-\)17.0 \(\pm\) 0.0 \\ Powdered stem & 34.3 \(\pm\) 0.2 & \(-\)16.8 \(\pm\) 0.1 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Size distribution and zeta potential analysis of AgNPs synthesized from various extracts. extracts at 3273.31, 2927.50, 2346.67, 2119.29, 1622.25, 1393.67, 1333.55, 1287.63, 1034.01, 897.23, 813.23 cm\({}^{-1}\) (Figure 8A) and stems at 3330.48, 3276.33, 2347.91, 2119.13, 1619.30, 1474.26, 1392.44, 1332.30, 1041.01, 932.56, 895.77 cm\({}^{-1}\) (Figure 8B). Additionally, for the aqueous fresh leaf extracts, peaks were observed at 3397.89, 3370.78, 2331.58, 2122.09, 1911.28, 1599.40, 1389.56, 1323.17, 1070.81, 1039.08, 820.01, 722.42 cm\({}^{-1}\) (Figure 9A) and stems at 3269.77, 2929.85, 2348.90, 2110.30, 2094.08, 1614.30, 1391.17, 1330.95, 1038.69, 896.38, 821.34 cm\({}^{-1}\) (Figure 9B). Lastly, peaks for the aqueous powdered leaf extracts were detected at 3281.52, 3223.08, 2927.53, 2328.14, 2115.65, 1888.35, 1592.68, 1394.61, 1336.86, 1036.22, 808.04, 767.36 cm\({}^{-1}\) (Figure 10A) and stems at 3262.30, 2929.28, 2344.39, 2116.90, 1607.25, 1391.95, 1333.34, 1036.10, 766.74 cm\({}^{-1}\) (Figure 10B). Absorbance peaks observed between 2700-3200 and 3200-3550 cm\({}^{-1}\) are distinctive to a possible O-H stretching group of polyphenols/alcohol, respectively [95; 96; 97]. A peak at 3330.48 cm\({}^{-1}\) corresponds to phenolic hydroxyl groups and secondary amines. A similar peak has been observed in _B. longiflora_ leaf aqueous extract [61]. The presence of a moderately sharp peak at 2927 cm\({}^{-1}\) was associated with the asymmetric vibration of methylene groups C-H (methoxy compounds) [98]. The 2117 and 2120 cm\({}^{-1}\) wavelengths  
Figure 9: FTIR spectra of the synthesized AgNPs. (**A**) aqueous fresh leaf extracts; (**B**) aqueous fresh stem extracts of _B. albostellata._  
display the symmetrical C\(\equiv\)C vibration of alkynes. Bands appearing in the range of 1700-1600 cm\({}^{-1}\) were linked to C-O stretching vibrations [99]. Bands at 1619.30 and 1622.25 cm\({}^{-1}\) were characteristic to C=O stretching. A band at 1619 cm\({}^{-1}\) was designated to flavonoid and fisetin [100]. Figure 10: FTIR spectra of the synthesized AgNPs. (**A**) powdered leaf extracts; (**B**) powdered stem extracts of _B. albostellata_. Peaks at 1650-1580 cm\({}^{-1}\) may be linked to symmetric N-H bending (amine). Similar bending vibrations related to amine were observed in the leaf extracts of _B. prionitis_[10], while peaks at 1420-1330 cm\({}^{-1}\) were related to O-H bending. Bands ranging from 1390-1380 cm\({}^{-1}\) are characteristic to C-H bending of aldehyde. Aromatic amine, C-N stretching is related to peaks at 1342-1266 cm\({}^{-1}\). Aromatic esters are associated to the symmetric vibration C-O at peaks of 1310-1250 cm\({}^{-1}\). Additionally, vibrational stretching of C-O was observed in the leaf extracts of _B. prionitis_[10]. Peaks at 1250-1020 cm\({}^{-1}\) relate to the symmetric C-N vibration of amine [101]. Peaks at 850-550 cm\({}^{-1}\) are linked to C-Cl stretching, a halo compound. Peaks in the range of 880 \(\pm\) 20 cm\({}^{-1}\) and 810 \(\pm\) 20 cm\({}^{-1}\) corresponds to C-H bending. A peak at 755 \(\pm\) 20 cm\({}^{-1}\) represents C-H bending (1,2-disubstituted). [PERSON] et al.