Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (01): 35-39.doi: 10.13475/j.fzxb.20200405405

• Fiber Materials • Previous Articles     Next Articles

Dissolution and regeneration of wool keratin in choline thioglycolate

YUAN Jiugang(), JI Ji, XUE Qi, JIANG Zhe, FAN Xuerong, GAO Weidong   

  1. Key Laboratory of Eco-Textiles (Jiangnan University), Ministry of Education, Wuxi, Jiangsu 214122, China
  • Received:2020-04-10 Revised:2020-09-28 Online:2021-01-15 Published:2021-01-21

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Abstract:

In order to improve the solubility and utilization of waste wool fiber, a new type of reducing ionic liquid-choline thioglycolate, was employed for wool dissolution in the reported research. The dissolution process of a single wool fibre in choline thioglycolate was carefully observed using polarizing optical microscope. The wool keratin extracted at different temperatures was characterized through fourier transform infrared spectrometer,X-ray diffraction,differential scanning calorimetry and SDS-PAGE in detail. The results show that choline thioglycolate is able to effectively destroy the disulfide bonds in wool keratin, thus achieving efficient dissolution of the wool cortex and scales. At 120 ℃, the dissolution of wool in choline thioglycolate reached up to 16%, and the regenerated wool keratin retained the main body structure. However, compared with raw wool fibers, the α-helix content in the regenerated keratin and the molecular weight decreased, and the keratin macromolecules degraded seriously under higher temperature.

Key words: wool, keratin, choline thioglycolate, ionic liquid, disulfide bond

CLC Number: 

  • TS195.5

Fig.1

Dissolution rate curve of wool in choline thioglycolate"

Fig.2

Polarizing optical microscope images of wool fiber in choline thioglycolate"

Fig.3

Polarizing optical microscope images of cortical layer in choline thioglycolate"

Fig.4

Polarizing optical microscope images of scales in choline thioglycolate"

Fig.5

FTIR spectra of wool and regenerated keratin"

Fig.6

XRD pattern of wool and regenerated keratin"

Tab.1

CI of wool and regenerated keratin"

样品 溶解温度/℃ I9/a.u. I14/a.u. CI
原毛 592 278 0.53
再生角蛋白 110 340 224 0.34
再生角蛋白 120 380 266 0.30
再生角蛋白 130 388 291 0.25

Fig.7

DSC pattern of wool and regenerated keratin"

Fig.8

SDS-PAGE patterns of wool and regenerated keratin"

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