Hyperbranched 5,6-glucan

Figure 7.14 Polymerization of 5,6-anhydro-1,2-0-isopropylidene-a-D-glucofuranose (21) and synthesis of hyperbranched 5,6-glucan (Poly22) by hydrolysis of Poly21.

Hyperbranched 5,6-Glucan by Polymerization of 5,6-Anhydro-(x-D-glucofuranose Derivative... 

The hydrolysis of Polyll was carried out using a mixture of trifluoroacetic acid and water (85/15, v/v) to produce the hyperbranched poly(5,6-anhydro-a-D-glucofuranose) (Poly22), that is, the hyperbranched 5,6-glucan. The physical data of Poly22 are listed in Table 7.6. The obtained polymers Poly22 were white powders that were soluble in water, and insoluble in chloroform, THF, DMF and methanol, which differed remarkably from the solubility of Poly21. 

Satoh, T., et al., Synthesis, branched structure, and solution property of hyperbranched D-glucan and D-galactan. Macromolecules 38(10) 4202-4210, 2005. 

Figure 7.3 Repeating units in hyperbranched D-glucan (Polyla). T-p and T-/mean a nonreducmg terminal D-glucopyranosyl and a D-glucofuranosyl residue, respectively. (l-4)-p and (1- )-p mean a (1 4)-linked D-glucopyranosyl and a (1 6)-linked glucopyranosyl residue, respectively, and so on.

Figure 7.28 Synthesis of unimolecular reversed micelle (25) consisting of hydrophilic hyperbranched D-glucan core and hydrophobic L-leucine ethyl ester shell.

Table 7.8 Solubilities of hyperbranched o-glucan (Polyla) and the hyperbranched o-glucan with L-leucine moiety (25)" ...

Sat(, T., Kitajyo, Y., Sakai, R. et al. (2009) Size-selective encapsulation property of unimolecular reverse micelle consisting of hyperbranched D-glucan core andL-leucine ethyl ether shelL Macromolecular Symposia, 279,145—150. 

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