Table 6.
Physical characteristics of commercial γ-PGA and γ-PGA synthesised from GS/algal media. Samples marked with * are aggregated and *** are highly aggregated; as such, the calculation was carried out only for the range where there was good separation on the columns. The displayed data underwent tangential flow filtration purification through a 30 kDa membrane.
| Production Method | Mn [kDa] | Mw [kDa] | Mw/Mn | XRD |
|---|---|---|---|---|
| YR spec γ-PGA | 250 | 440 | 1.8 | Amorphous |
| Bonding chemical 10,000 | 115 | 216 | 1.9 | Semi-crystalline |
| Bonding chemical 1,100,000 | 120 | 250 | 2.1 | Semi-crystalline |
| GS, 0 g/L NaCl PTF [24] | 3320 | 3700 | 1.1 | Amorphous |
| GS, 25 g/L NaCl PTF [24] | 1900 | 2310 | 1.2 | Semi-crystalline |
| GS, 50 g/L NaCl PTF [24] | 1810 | 2700 | 1.5 | Crystalline |
| GS, 25 g/L NaCl + MnSO4 PTF [24] | 740 | 1280 | 1.7 | Crystalline |
| Ap, 0 g/L NaCl PTF (*) | 66 | 210 | 3.2 | Amorphous |
| Ap, 25 g/L NaCl PTF (*) | 160 | 250 | 2.8 | Amorphous |
| 13 | 36 | 1.6 | ||
| 12 | 24 | 2.0 | ||
| Ap, 50 g/L NaCl PTF (*) | 38 | 102 | 2.7 | Amorphous |
| ApMn, 0 g/L NaCl PTF (***) | 250 | 900 | 3.6 | Amorphous |
| ApMn, 25 g/L NaCl PTF (*) | 62 | 152 | 2.5 | Amorphous |
| ApMn, 50 g/L NaCl PTF (*) | 66 | 150 | 2.3 | Amorphous |