Spidroin regenerated

Regenerated spidroin and fibroin dissolved in various solvents are used as spinning dope while the coagulation baths are mainly alcohol (Table 4). In addition certain fiber post-treatments, such as drawing, are used as well. 

The wet spinning of regenerated spidroin was reported in the early 1990s by Jelinski et al. They dissolved spider silk in hexafluoroisopro-panol (HFIP) at a concentration of 2.5 wt% to produce an artificial fiber using water, methanol, isopropanol, and acetone as coagulation bath. The reconstituted silk could only be shaped in acetone but the structure... 

Figure 7 The morphologies of regenerated spidroin silks, (a) The silk formed in acetone and subsequently stretched (Seidel et al, 2000). (b) Silk drawn out of solution into air (Shao et al, 2003). (c) Silk produced from the recombinant ADF-3 (Lazaris et al, 2002).

Table 4 Examples of wet spinning processes using regenerated fibroin, spidroin, and recombinant spidroin, with different solvents and coagulation baths (Zhou et al., 2006a)...

---