Dissolution and regeneration of wool keratin in ionic liquids

Idris, Azila; Vijayaraghavan, R.; Rana, Usman Ali; Patti, Antonio F.; MacFarlane, Douglas R.

doi:10.1039/c4gc00213j

Cited by 167 publications

(178 citation statements)

References 57 publications

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“…This is because the α-helix structure is destroyed by the L-cysteine during the dissolving process and is not restored. 10 The peaks at about 9°and 19°are both significantly stronger in the regenerated wool, suggesting a slight increase in the content of the β-sheet structure.…”

Section: Resultsmentioning

confidence: 98%

“…10,23,24 The volatile compounds including hydrogen sulphide and sulphur dioxide are released from wool due to the cleavage of the disulfide bonds that occurred between 230°C and 250°C. 10 Fig. 10 shows that the maximum temperature of thermal decomposition of the regenerated wool keratin was lower compared to the natural wool, probably due to the cleavage of the disulfide bonds during the extraction process of regenerated wool keratin.…”

Section: Resultsmentioning

confidence: 99%

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Extracting keratin from wool by using l-cysteine

et al. 2016

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Keratin proteins are the major components of hair, feathers, wool and horns and represent an important source of renewable raw materials for many applications. The dissolution of the wool keratin is the first step of reuse of keratin wastes. In this work, L-cysteine was applied to the dissolution of wool keratin for the first time as a reducing agent. The dissolution time was 5 h at 75°C with 72% dissolubility. XRD, ATR-FTIR and 13 C NMR showed that the content of α-helix structures in regenerated wool keratin was decreased compared with natural wool. The content of S-S crosslinkages for regenerated wool keratin significantly decreased and broke about 62% of the S-S crosslinkages in the natural wool, as observed from Raman spectra.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Extracting keratin from wool by using l-cysteine

et al. 2016

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“…In comparison to traditional solvents, ILs have many advantages, such as negligible vapour pressure, excellent efficiencies in the dissolution of many compounds and are highly tuneable with the numerous anion and cation combinations [12]. In general, wool fibers are difficult to dissolve in traditional solvents, while they can be readily dissolved in ILs [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Rapid and effective cuticle removal from wool fibers using ionic liquid

et al. 2015

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Wool fibers are composed of cuticle and cortex cells, which are of obvious differences in many properties. The development of methods to isolate the two kinds of cells can provide platform to elucidate the roles they play in the characteristics of wool fibers. Here we demonstrate the cuticle can be completely and rapidly removed from the wool fibers by the use of ionic liquids, with inner cortex intact. Confocal microscope, SEM and FTIR have been applied to study the wool fibers after cuticle removal. In contrast to the traditional/long physical or chemical separation routes (>14 h), our method is very rapid (<1 h). This work demonstrates the ability of ionic liquid as a novel, rapid and efficient media for cuticle/ cortex isolation.

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“…Wool, which consists of approximately 95% pure keratin (11-17% cysteine) [1] has been widely used in textile industries because of outstanding mechanical properties. However, significant amounts of short and coarse wool keratin are currently discarded as leftovers from the textile industries every year, which results in waste of keratin and environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

“…To date, they have been used 3 in dissolving biological macromolecules such as cellulose, [4][5][6] silk, [7][8][9] wool, [1,[10][11][12] feather [13][14][15] , and show excellent solubility. Several conventional ILs have been used in dissolving keratin of feather or wool.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Dissolution of Wool Keratin by Dimethylphosphate Ionic Liquids

Zheng

Nie

Zhang

et al. 2015

ACS Sustainable Chem. Eng.

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Ionic liquids (ILs) are eco-friendly solvents and exhibit excellent performance for dissolution and regeneration of wool keratin. In this work, a series of ILs are designed and synthesized to investigate effects of ILs structures on dissolving wool keratin and properties of regenerated keratin. The results show that both cations and anions have important impacts on dissolution capability for wool, while side chain lengths of imidazole cation have little effect. Structures and properties of regenerated keratin are characterized by various techniques such as FT-IR, NMR, SEM, TGA and XRD. It is found that the dissolution time is shorten to 1.5 h by[Emim]DMP, thermal stability of regenerated keratin from its solution is superior to that from Bmim]OAc solution, and the proportion of α-helix structure is as high as 78.7%. In addition, five cycles of [Emim]DMP suggest that it has a good reusability, and the rheological property of DPILs solutions shows their excellent potential for fiber spinning.

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Dissolution and regeneration of wool keratin in ionic liquids

Abstract: Substantial dissolution of wool was obtained in [AMIM][dca] and [choline][thioglycolate] ionic liquids as well as in deep eutectic solvent mixtures, under a variety of conditions including the use of a reducing agent.

Cited by 167 publications

References 57 publications

Extracting keratin from wool by using l-cysteine

Extracting keratin from wool by using l-cysteine

Rapid and effective cuticle removal from wool fibers using ionic liquid

Highly Efficient Dissolution of Wool Keratin by Dimethylphosphate Ionic Liquids

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