# Biosynthesis of Silver Nanoparticles Using _Tabernaemontana ventricosa_ Extracts
## 3 Results and Discussion
### Fourier Transform Infrared (FTIR) Spectroscopy
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{\begin{tabular}{c} **Plant** \\ **Extract** \\ \end{tabular} } & \begin{tabular}{c} **Absorption** \\ **Frequency** \\ **(cm\({}^{-1}\))** \\ \end{tabular} & \begin{tabular}{c} **Types of** \\ **Absorption/** \\ **Vibration** \\ \end{tabular} & \begin{tabular}{c} **Appearance** \\ **Parameter** \\ **Group** \\ \end{tabular} & \begin{tabular}{c} **Interference/** \\ **Functional** \\ **Group** \\ \end{tabular} & \begin{tabular}{c} **Compound Class** \\ **Compound Class** \\ \end{tabular} \\ \hline \multirow{7}{*}{\begin{tabular}{c} Leaf \\ methanol \\ \end{tabular} } & 3295.32 & Stretch & Strong broad & O–H & Alcohol \\ \cline{2-5}  & 3273.38 & Stretch & Strong broad & O–H & Alcohol \\ \cline{2-5}  & 2924.68 & Stretch & Medium & C–H & Alkane \\ \cline{2-5}  & 2394.69 & Stretch & Strong & O=C=O & Carbon dioxide \\ \cline{2-5}  & 2105.80 & Stretch & Weak & C=C & Alkyne \\ \cline{2-5}  & 1623.91 & Stretch & Medium & C=C & Conjugated alkene \\ \cline{2-5}  & 1336.46 & Bending & Medium & O–H & Alcohol \\ \cline{2-5}  & 1050.28 & Stretch & Strong & C–O & Primary alcohol \\ \cline{2-5}  & 802.05 & Bending & Medium & C=C & Alkene \\ \hline \multirow{7}{*}{\begin{tabular}{c} Stem \\ methanol \\ \end{tabular} } & 3304.50 & Stretch & Medium & N–H & \begin{tabular}{c} Aliphatic primary \\ amine \\ \end{tabular} \\ \cline{2-5}  & 3261.97 & Stretch & Strong broad & O–H & Alcohol \\ \cline{2-5}  & 2922.18 & Stretch & Strong broad & N–H & amine salt \\ \cline{2-5}  & 2340.00 & Stretch & Strong & O=C=O & Carbon dioxide \\ \cline{2-5}  & 2110.75 & Stretch & Weak & C\(\equiv\)C & Alkyne \\ \cline{2-5}  & 1601.17 & Stretch & Medium & C=C & Conjugated alkene \\ \cline{2-5}  & 1334.31 & Bending & Medium & O–H & Alcohol \\ \cline{2-5}  & 1043.12 & Stretch & Strong broad & CO–O-CO & anhydride \\ \cline{2-5}  & 989.51 & Bending & Strong & C=C & alkene \\ \cline{2-5}  & 922.32 & Bending & Strong & C=C & alkene \\ \cline{2-5}  & 822.50 & Bending & Medium & C=C & alkene \\ \hline \multirow{7}{*}{\
\begin{tabular}{c} Fresh \\ leaf \\ \end{tabular} } & 3260.11 & Stretch & Strong broad & O–H & Alcohol \\ \cline{2-5}  & 2933.85 & Stretch & Strong broad & N–H & amine salt \\ \cline{2-5}  & 2395.37 & Stretch & Strong & O=C=O & Carbon dioxide \\ \cline{2-5}  & 2346.05 & Stretch & Strong & O=C=O & Carbon dioxide \\ \cline{2-5}  & 2095.91 & Stretch & Strong & N=C=S & Isothiocyanate \\ \cline{2-5}  & 1599.57 & Stretch & Strong & N–O & Nitro compound \\ \cline{2-5}  & 1319.11 & Bending & Medium & O–H & Phenol \\ \cline{2-5}  & 1044.99 & Stretch & Strong broad & S=O & sulfoxide \\ \cline{2-5}  & 820.01 & Bending & Medium & C=C & alkene \\ \hline \multirow{7}{*}{
\begin{tabular}{c} Fresh \\ stem \\ \end{tabular} } & 3274.20 & Stretch & Strong broad & O–H & Alcohol \\ \cline{2-5}  & 2936.60 & Stretch & Strong broad & N–H & amine salt \\ \cline{2-5}  & 2395.51 & Stretch & Strong & O=C=O & Carbon dioxide \\ \cline{2-5}  & 2353.80 & Stretch & Strong & O=C=O & Carbon dioxide \\ \cline{2-5}  & 2117.48 & Stretch & Weak & C=C & Alkyne \\ \cline{2-5}  & 2091.37 & Stretch & Strong & N=C=S & Isothiocyanate \\ \cline{2-5}  & 1862.28 & Bending & Weak & C–H & Aromatic compound \\ \cline{2-5}  & 1605.68 & Stretch & Medium & C=C & Conjugated alkene \\ \cline{2-5}  & 1335.16 & Stretch & Strong & S=O & Sulfonate/sulfonamide \\ \cline{2-5}  & 1054.95 & Stretch & Strong & C–O & Primary alcohol \\ \cline{2-5}  & 821.96 & Bending & Medium & C=C & Alkene \\ \hline \hline \end{tabular}
\end{table} 
Table 4: FTIR spectral assignments of the synthesized AgNPs using various extracts of _T. ventricosa_. Figure 7: _Cont._  
The FTIR spectra displayed strong intensity peaks between 3200 cm\({}^{-1}\) and 3400 cm\({}^{-1}\) for all AgNP solutions (Figure 7).