Recombinant-structure protein multifilament and method for manufacturing same
An object of the present invention is to provide a method for producing a modified fibroin multifilament excellent in productivity and a multifilament produced by the same. The multifilament of the present invention contains modified fibroin, in which the multifilament has 100 or more constituent single yarns, a coefficient of variation in elastic modulus is 15% or less, a coefficient of variation in strength is 15% or less, and a coefficient of variation in elongation is less than 33%.
1 . A multifilament comprising modified fibroin, wherein the multifilament has 1,000 or more and 300,000 or less constituent single yarns, a coefficient of variation in elastic modulus of the multifilament is 15% or less, a coefficient of variation in strength of the multifilament is 15% or less, and a coefficient of variation in elongation of the multifilament is 2.6 to 10%.
2 . The multifilament according to claim 1 , wherein a coefficient of variation in fineness of the multifilament is 20% or less.
3 . The multifilament according to claim 1 , wherein the coefficient of variation in strength of the multifilament is 10% or less, and the coefficient of variation in elastic modulus of the multifilament is 10% or less.
4 . The multifilament according to claim 1 , wherein an average hydropathy index of the modified fibroin is more than −0.8.
5 . The multifilament according to claim 1 , wherein the modified fibroin is modified spider silk fibroin.
6 . The multifilament according to claim 1 , wherein the multifilament has a shrinkage history of being irreversibly shrunk after spinning.
7 . The multifilament according to claim 6 , wherein the shrinkage history is a shrinkage history of being irreversibly shrunk by bringing the multifilament into contact with water or a shrinkage history of being irreversibly shrunk by heating and relaxing the multifilament.
8 . The multifilament according to claim 6 , wherein a shrinkage rate of the multifilament having a shrinkage history of being irreversibly shrunk after spinning is 5% or less, the shrinkage rate being defined by the following equation:
Shrinkage rate [%]=(1−(length of multifilament when dried from wet state/length of multifilament when in wet state))×100.
9 . The multifilament according to claim 1 , wherein a coefficient of variation in fineness of the multifilament is 0.01% to 6.5%.
10 . The multifilament according to claim 1 , wherein the coefficient of variation in strength of the multifilament is 0.01% to 3.8%.
11 . A multifilament comprising a recombinant structural protein, wherein the multifilament has 100 or more constituent single yarns, and a coefficient of variation in elongation is 2.6 to 10%.
12 . A method for producing the multifilament of claim 1 , comprising a step of discharging a spinning raw material solution containing modified fibroin and a solvent from a spinning nozzle having 100 or more holes, and bringing the spinning raw material solution into contact with a coagulation liquid to coagulate the modified fibroin.
13 . A method for producing the multifilament of claim 1 , comprising a step of discharging a spinning raw material solution containing a recombinant structural protein and a solvent from a spinning nozzle having 100 or more holes, and bringing the spinning raw material solution into contact with a coagulation liquid to coagulate the recombinant structural protein.
14 . A method for producing the multifilament of claim 11 , comprising a step of discharging a spinning raw material solution containing modified fibroin and a solvent from a spinning nozzle having 100 or more holes, and bringing the spinning raw material solution into contact with a coagulation liquid to coagulate the modified fibroin.
15 . A method for producing the multifilament of claim 11 , comprising a step of discharging a spinning raw material solution containing a recombinant structural protein and a solvent from a spinning nozzle having 100 or more holes, and bringing the spinning raw material solution into contact with a coagulation liquid to coagulate the recombinant structural protein.