Physical properties and structure of silk. VI. Conformational changes in silk fibroin induced by immersion in water at 2 to 130°c

Magoshi, Jun; Mizuide, Michio; Magoshi, Yoshiko; Takahashi, Kazuo; Kubo, Masaaki; Nakamura, Shuichi

doi:10.1002/pol.1979.180170315

Cited by 114 publications

(102 citation statements)

References 4 publications

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“…7(A)] shows nent in the blends. One can also observe the typical absorption bands of SF at 1629 ( amide on the equator a rather strong and relatively sharp reflection with a Bragg spacing d Å 5.24 Å I ) , 1530 ( amide II ) , and 1265 ( amide III ) , assigned to the silk II form, 11 and the bands at presented, in agreement with the literature data. 15,16 SF [see Fig.…”

Section: Moisture Absorptionsupporting

confidence: 87%

“…15,16 SF [see Fig. 7(E); this sample was rep-1658 ( amide I ) and 1235 ( amide III ) , attributed to random coil 11 or silk I form. 12 Asakura and resented by the original degummed silk fibroin from wasted silk fiber] shows a reflection at d co-workers 13 even claimed that the distinction between the silk I form and random coil forms Å 4.5 and d Å 4.69 Å , assigned to the silk I and silk II forms, respectively.…”

Section: Moisture Absorptionmentioning

confidence: 96%

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Acrylic polymer-silk fibroin blend fibers

Sun

Shao

et al. 1997

J. Appl. Polym. Sci.

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Blends of acrylic polymer (containing acrylonitrile 91.7%, methyl acrylate 7%, and sodium methyl propenyl sulfonate 1.3% [wt %], denoted as PAC) with silk fibroin (SF) were studied in the form of drawn fibers with varied compositions. The strength, elongation, and specific work of rupture of the blend fibers decrease with increase of the SF content, whereas the modulus has a slight increase up to 20% (wt) SF and then decreases. With the addition of up to 30% (wt %) SF in the PAC matrix, the moisture absorption increases from 2.06 to 6.2% in comparison with the PAC. Scanning electron microscopy studies show that the blend fibers have a sheath-core structure, with SF mainly in the sheath and PAC in the core. FTIR, ATR, and X-ray diffraction results of the blend fibers are also presented.

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Section: Moisture Absorptionsupporting

confidence: 87%

Section: Moisture Absorptionmentioning

confidence: 96%

Acrylic polymer-silk fibroin blend fibers

Sun

Shao

et al. 1997

J. Appl. Polym. Sci.

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“…In addition, the thermal decomposition temperature was detected at about 280.99 ℃ (listed in Table 2). The small exothermic peak and the higher temperature endothermic peak could be attributed to the random coil-β-pleated sheet conformation transition [26][27][28] and to the thermal degradation of silk molecular chains [29]; the lower temperature endothermic peak was attributed by many authors to the water lost during the DSC test procedure [30][31].…”

Section: Resultsmentioning

confidence: 99%

Natural and Artificial Weathering of B.mori Silk Fabric

Ming¹,

Jiang²,

Zuo³

2011

AMR

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Abstract. Ultraviolet aging of B.mori silk fabric was studied under natural and artificial weathering conditions. Exposed samples were removed periodically and characterized by several analytical techniques. During both types of weathering, the results showed that yellowness index presented a rising trend with the extension of aging time; breaking strength of B.mori silk fabric decreased approximately 93.62%, 43.30% under natural aging 150 days and artificial accelerated aging 80 h, respectively; the peak intensity of amide I, and amide II, etc. significantly declined, even disappeared. At the same time, the conformation transition of B.mori silk was from random coil to β-pleated sheet following the prolonging of ultraviolet aging time. What's more, the content of amino acid obviously declined especially histidine, tyrosine, and lysine etc. In addition, the results evidenced that during natural and artificial weathering, various performances of B.mori silk fabric changed similarly. So artificial weathering can be used to substitute for natural weathering for its weathering evaluation, which is helpful to understand the aging behavior and take measures to avoid aging and elongate its service life.

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“…The cross-linking with tripolyphosphate was confirmed by FTIR spectra. The peak at 1644 cm −1 represents the cross-linking of tripolyphosphate molecule with the amino group of chitosan through C=N (42)(43)(44)(45)(46). Cross-linking of nanofiber with glutaraldehyde is associated with the absorption peak near 1090 cm .…”

Section: Resultsmentioning

confidence: 99%

Electrospinning of Cross-Linked Magnetic Chitosan Nanofibers for Protein Release

2015

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Abstract. A poly(vinylalcohol) (PVA) electrospun/magnetic/chitosan nanocomposite fibrous cross-linked network was fabricated using in situ cross-linking electrospinning technique and used for bovine serum albumin (BSA) loading and release applications. Sodium tripolyphosphate (TPP) and glutaraldehyde (GA) were used as cross-linkers which modified magnetic-Fe 3 O 4 chitosan as Fe 3 O 4/ CS/TPP and Fe 3 O 4/ CS/GA, respectively. BSA was used as a model protein drugs which was encapsulated to form Fe 3 O 4 /CS/TPP/BSA and Fe 3 O 4 /CS/GA/BSA nanoparticles. The composites were electrospun with PVA to form nanofibers. Nanofibers were characterized by field emission scanning electron microscopy (FESEM) and Fourier transform infrared spectroscopy (FTIR). The characterization results suggest that Fe 3 O 4 nanoparticles with average size of 45 nm were successfully bound on the surface of chitosan. The cross-linked nanofibers were found to contain uniformly dispersed Fe 3 O 4 nanoparticles. The size and morphology of the nanofibers network was controlled by varying the cross-linker type. FTIR data show that these two polymers have intermolecular interactions. The sample with TPP cross-linker showed an enhancement of the controlled release properties of BSA during 30-h experimental investigation.

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Physical properties and structure of silk. VI. Conformational changes in silk fibroin induced by immersion in water at 2 to 130°c

Cited by 114 publications

References 4 publications

Acrylic polymer-silk fibroin blend fibers

Acrylic polymer-silk fibroin blend fibers

Natural and Artificial Weathering of B.mori Silk Fabric

Electrospinning of Cross-Linked Magnetic Chitosan Nanofibers for Protein Release

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