## 4 Biosynthesis of Dextran in Optimized Microbial Processes
### Dextran Synthesized by Specific Strains of a Few Weissella Species
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Dextran Product Specification** & **Substrate/s Used in Biosynthesis** & **Strains Used to Conduct** & **Reference** \\ \hline
180 kDa & & & \\
96\% of \(\alpha\)-(1\(\rightarrow\)6) & 4\%, \(w/v\) solution of sucrose & & \\
96\% of \(\alpha\)-(1\(\rightarrow\)3) & & & \\ \hline
120–870 kDa & & & \\
96\% of \(\alpha\)-(1\(\rightarrow\)6) & 8\%, \(w/v\) solution of sucrose & _W. confus_ Strain PP29 isolated from yogurt & [94] \\
04\% of \(\alpha\)-(1\(\rightarrow\)3) & & & \\ \hline
120–250 kDa & & & \\
96\% of \(\alpha\)-(1\(\rightarrow\)6) & Solution of 8\%, \(w/v\) sucrose with milk & _W. confus_ Strain PP29 isolated from yogurt & [94] \\
04\% of \(\alpha\)-(1\(\rightarrow\)3) & & & \\ \hline
10 MDa & & & \\
97\% of \(\alpha\)-(1\(\rightarrow\)6) & 5\%, \(w/v\) solution of sucrose & _W. confus_ Strain Q8813, a & \\
03\% of \(\alpha\)-(1\(\rightarrow\)3) & & & \\ \hline
10 MDa & & & \\
97\% of \(\alpha\)-(1\(\rightarrow\)6) & 10\%, \(w/v\) solution of sucrose & _W. confus_ Strain R003 isolated from & [96] \\
03\% of \(\alpha\)-(1\(\rightarrow\)3) & & & \\ \hline
20 MDa & & & \\
97\% of \(\alpha\)-(1\(\rightarrow\)6) & 10\%, \(w/v\) solution of sucrose & _W. confus_ Strain R003 isolated from & [97] \\
03\% of \(\alpha\)-(1\(\rightarrow\)3) & & & \\ \hline
115 kDa & & & \\ \(\alpha\)-(1\(\rightarrow\)6) & 10\%, \(w/v\) solution of sucrose & _W. confus_ Strain K1-Lb5 & [98] \\ \(\alpha\)-(1\(\rightarrow\)3) & & & \\ \hline
20 MDa & & & \\
97\% of \(\alpha\)-(1\(\rightarrow\)6) & 10\%, \(w/v\) solution of sucrose & _W. confus_ & three strains SCs-2, 11 GU-1, & [97] \\
03\% of \(\alpha\)-(1\(\rightarrow\)3) & & & \\ \hline
12 MDa & & & \\ \(\alpha\)-(1\(\rightarrow\)6) & 20\%, \(w/v\) solution of sucrose & _W. cliveira_ Strain 27 & \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Dextrans of diverse MW and configuration synthesized by specific isolate strains of _Weissella_ species. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Dextran Product Specification** & **Substrate/s Used in Biosynthesis** & **Strains Used to Conduct** \\  & **Fermentative-Production** & **Reference** \\ \hline
87\% of \(\alpha\)-(1\(\rightarrow\)6) & & _Lactobacillus plantarum_ & \\
13\% of \(\alpha\)-(1\(\rightarrow\)3) & 5\%, \(w/v\) solution of sucrose & Strain DMS5 & [89] \\  & & An isolate from fermented & \\  & & beverage & \\ \hline
55\% of \(\alpha\)-(1\(\rightarrow\)6) & 15\%, \(w/v\) solution of sucrose & _L. satsumensis_ Strain NRRL B-59839 & [90] \\
45\% of \(\alpha\)-(1\(\rightarrow\)3) & 15\%, \(w/v\) solution of sucrose & _L. acidophilus_ Strains LV3, LV4, LV5 & [91] \\ \hline n.a. & 15\%, \(w/v\) solution of sucrose & _L. satxi_ Strain MN1 isolated from & [92] \\  & & meet products & [92] \\ \hline n.a. & 15\%, \(w/v\) solution of sucrose & _L. fermentutum_ Strain LS2 & [91] \\  & & isolated from the stool sample & [91] \\ \hline n.a. & 15\%, \(w/v\) solution of sucrose & _L. plantarum_ Strain LS3 & [91] \\  & & isolated from the stool sample & [91] \\ \hline
123 MDa & & & \\ with \(\alpha\)-(1\(\rightarrow\)6) & 2\%, \(w/v\) solution of sucrose & _L. mali_ Strain CUPV271 & \\  & & an isolate from the ropy slime of ham & [76] \\  & & & \\ \hline n.a. & 15\%, \(w/v\) solution of sucrose & _L. gasseri_ Strains LV1, LV2, & \\  & & isolated from vaginal swabs, & [91] \\  & & strain I CSI isolated from stool samples & \\ \hline High molecular weight dextran & 5.0\%, \(w/v\) sucrose & _L. sakvi_ strain TMW 1.411, & [87] \\  & & isolated from sauerkraut & \\ \hline High molecular weight dextran with & 15\%, \(w/v\) solution of sucrose & _L. acidophilus_ strain ST76480.01 & [88] \\  & & an isolate from fermented vegetables & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Dextrans of diverse MW and configuration synthesized by specific isolate strains of _Lactobacillus_ species.