## 3 Results and Discussion
### Color Measurements
\begin{table}
\begin{tabular}{l c c c c} \hline \hline \multicolumn{2}{c}{(a) **Starch Hydrogels**} & \multicolumn{4}{c}{**Coordinates**} \\ \hline  & **T***C** & **L*** & **a*** & **b*** & **\(\Delta\)E** \\ \hline  & 140 & \(30.82\pm 1.16\)\({}^{\text{ d}}\) & \(0.37\pm 0.05\)\({}^{\text{ s}}\) & \(7.42\pm 0.14\)\({}^{\text{ d}}\) & - \\  & 160 & \(31.29\pm 0.77\)\({}^{\text{ d}}\) & \(0.71\pm 0.03\)\({}^{\text{ e}}\) & \(8.20\pm 0.18\)\({}^{\text{ c}}\) & \(0.97\pm 0.39\) \\
**Bark** & 180 & \(27.33\pm 0.36\)\({}^{\text{ f}}\) & \(0.92\pm 0.05\)\({}^{\text{ d}}\) & \(6.40\pm 0.34\)\({}^{\text{ e}}\) & \(3.68\pm 0.83\) \\  & 200 & \(30.57\pm 0.74\)\({}^{\text{ d}}\) & \(0.31\pm 0.05\)\({}^{\text{ s}}\) & \(6.34\pm 0.42\)\({}^{\text{ e}}\) & \(1.11\pm 0.51\) \\  & 220 & \(34.75\pm 0.79\)\({}^{\text{ c}}\) & \(5.33\pm 0.13\)\({}^{\text{ a}}\) & \(17.70\pm 0.54\)\({}^{\text{ a}}\) & \(12.07\pm 0.55\) \\  & 240 & \(36.11\pm 0.21\)\({}^{\text{ b}}\) & \(0.58\pm 0.07\)\({}^{\text{ f}}\) & \(14.42\pm 0.37\)\({}^{\text{ b}}\) & \(8.77\pm 0.98\) \\  & 140 & \(24.96\pm 0.16\)\({}^{\text{ g}}\) & \(2.94\pm 0.06\)\({}^{\text{ b}}\) & \(2.29\pm 0.034\)\({}^{\text{ g}}\) & - \\  & 160 & \(23.96\pm 0.80\)\({}^{\text{ g}}\) & \(1.81\pm 0.11\)\({}^{\text{ c}}\) & \(1.27\pm 0.28\)\({}^{\text{ h}}\) & \(1.82\pm 0.66\) \\
**Leaves** & 180 & \(25.11\pm 0.90\)\({}^{\text{ g}}\) & \(-0.45\pm 0.09\)\({}^{\text{ h}}\) & \(0.20\pm 0.03\)\({}^{\text{ i}}\) & \(3.98\pm 0.74\) \\  & 200 & \(23.98\pm 0.8\)\({}^{\text{ b}}\) & \(-0.54\pm 0.07\)\({}^{\text{ i}}\) & \(-0.02\pm 0.06\)\({}^{\text{ k}}\) & \(4.29\pm 0.64\) \\  & 220 & \(25.03\pm 0.43\)\({}^{\text{ g}}\) & \(-0.62\pm 0.03\)\({}^{\text{ i}}\) & \(0.41\pm 0.04\)\({}^{\text{ i}}\) & \(4.02\pm 0.27\) \\  & 240 & \(25.11\pm 0.33\)\({}^{\text{ g}}\) & \(2.85\pm 0.05\)\({}^{\text{ b}}\) & \(1.52\pm 0.14\)\({}^{\text{ h}}\) & \(0.79\pm 0.21\) \\  & 140 & \(34.38\pm 0.45\)\({}^{\text{ c}}\) & \(-0.61\pm 0.04\)\({}^{\text{ i}}\)\({}^{\text{ j}}\) & \(8.18\pm 0.18\)\({}^{\text{ c}}\) & - \\  & 160 & \(31.06\pm 0.30\)\({}^{\text{ d}}\) & \(-0.75\pm 0.08\)\({}^{\text{ b}}\) & \(6.65\pm 0.18\)\({}^{\text{ e}}\) & \(3.66\pm 0.15\) \\
**Petioles** & 180 & \(30.93\pm 0.34\)\({}^{\text{ d}}\) & \(-0.64\pm 0.08\)\({}^{\text{ b}}\) & \(6.94\pm 0.24\)\({}^{\text{ e}}\) & \(3.67\pm 0.13\) \\  & 200 & \(30.31\pm 0.60\)\({}^{\text{ d}}\) & \(0.79\pm 0.10\)\({}^{\text{ e}}\) & \(8.17\pm 0.24\)\({}^{\text{ c}}\) & \(4.31\pm 0.18\) \\  & 220 & \(29.97\pm 0.16\)\({}^{\text{ d}}\) & \(0.41\pm 0.06\)\({}^{\text{ g}}\) & \(5.47\pm 0.03\)\({}^{\text{ f}}\) & \(7.96\pm 0.32\) \\  & 240 & \(37.22\pm 0.45\)\({}^{\text{ a}}\) & \(0.14\pm 0.03\)\({}^{\text{ h}}\) & \(14.28\pm 0.44\)\({}^{\text{ b}}\) & \(6.77\pm 0.27\) \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Color coordinates by CIEL*a*b* system for hydrogels formulated with starch (a) and gelatin (b). \begin{table}
\begin{tabular}{l c c c} \hline \hline  & & _Bark_ & _Leaves_ & _Petioles_ \\ \hline
**140 \({}^{\circ}\)C** & \(R_{0}\) & 23.13 & 24.64 & 26.75 \\
**_Severity_** & 1.36 & 1.39 & 1.43 \\
**160 \({}^{\circ}\)C** & \(R_{0}\) & 151.1 & 122.61 & 139.14 \\
**_Severity_** & 2.18 & 2.09 & 2.14 \\
**_R\({}_{0}\) & 560.47 & 569.57 & 537.4 \\
**_Severity_** & 2.75 & 2.76 & 2.73 \\
**_R\({}_{0}\) & 2188.13 & 2356.25 & 2013.74 \\
**_Severity_** & 3.34 & 3.37 & 3.3 \\
**_R\({}_{0}\) & 9545.34 & 9696.99 & 10,073.78 \\
**_Severity_** & 3.98 & 3.99 & 4 \\
**_R\({}_{0}\) & 35,207.12 & 36,810.67 & 42,454.67 \\
**_Severity_** & 4.55 & 4.57 & 4.63 \\ \hline \hline \end{tabular} Note here that for all temperatures the standard deviations were \(<\)2.5%.  
\end{table} 
Table 1: Severity factor of autohydrolysis extraction of different parts of Paulownia.