Photochemical behaviour of natural silk—I. Kinetic investigation of photoyellowing

Baltova, Stela; Vassileva, Valya; Valtcheva, E.

doi:10.1016/s0141-3910(97)00016-5

Cited by 39 publications

(18 citation statements)

References 12 publications

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“…Stela, etc. [24] confirmed the photo-oxidation of natural silk happening. In the photo-oxidation process, the increase of the amount of carbonyl groups during irradiation proves that they are the main products formed.…”

Section: Resultssupporting

confidence: 57%

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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Section: Resultssupporting

confidence: 57%

Natural and Artificial Weathering of B.mori Silk Fabric

Ming¹,

Jiang²,

Zuo³

2011

AMR

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“…4 In the past, the degradation kinetics and mechanism of ancient silk and artificially aged silk were studied, which were aged by UV-irradiation, heating and modified humidity methods. [5][6][7][8] However, research concerning the enzymatic degradation of silk fabrics was limited. After being buried in the ground for centuries, unearthed silk fabrics were bestrewed by various microorganisms.…”

Section: Introductionmentioning

confidence: 99%

“…According to the literatures, 1,3,6,7 it was known that the photooxidizing, thermal, hydrolyzing degradation of silk fibroin were related to the changes with amino acid residues and breaking of the inter or intra chains bonds. 10 However, it was still unknown how the changes of enzymatic degradation occurred.…”

Section: Introductionmentioning

confidence: 99%

Application of Electron Paramagnetic Resonance and Solid-state 13C Nuclear Magnetic Resonance of Cross-polarization/Magic Angle Spinning to Study Enzymatic Degradation of Silk Fabrics

et al. 2017

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The enzymatic degradation of silk by protease XIV has been investigated by using scanning electron microscopy (SEM), Fourier transfer infrared spectroscopy (FTIR), solid-state 13 C nuclear magnetic resonance of cross-polarization/magic angle spinning ( 13 C CP/MAS solid state NMR) and electron paramagnetic resonance (EPR). Micro-morphology of protease XIV aged samples showed that microfilaments were stripped out from the surface of silk fibers. The results of FTIR and 13 C CP/MAS solid-state NMR indicated that the enzymatic degradation process could be divided into two stages. The EPR spectra indicated that the enzymatic degradation process was related to the free radical with the g-factor value of 2.0043. We also proposed that at the first degradation stage, the free radicals were apt to lose activities due to the loose structure of the non-crystalline region; at the second degradation stage, the free radicals produced in the crystalline region tended to be stored.

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“…Light, temperature and humidity have a detrimental impact on the rate of the degradation, manifested by, for example, glass transition [13], recrystallisation [14,15], oxidative [16][17][18][19] and photooxidative [20,21] changes, and photoinduced -S-S-bond breakdown [22,23]. Additionally, the material during natural ageing emits volatile organic compounds (VOCs), which results in mass loss [24].…”

Section: Introductionmentioning

confidence: 99%

“…High temperature induces the changes in its amino acids composition of fibroin [16,19,26] and to the scissions of its chains, which in turn results in the changes in molar mass distribution. It also enhances the formation of oxygen free radicals [27,28], which attack the most reactive amino acids: tryptophan, tyrosine and phenylalanine in amorphous regions [23,29]. This eventually gives rise to the loss of silk brightness [19,24,30].…”

Section: Introductionmentioning

confidence: 99%

Evaluating the impact of different exogenous factors on silk textiles deterioration with use of size exclusion chromatography

et al. 2016

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Size exclusion chromatography (SEC), especially coupled with multiple angle laser light scattering detector (MALLS) is a powerful tool in diagnostics of deterioration of historic and art objects to evaluate their condition. In this paper, SEC-UV-MALLS-DRI technique was applied to study degradation of silk fibroin samples (Bombyx mori) artificially aged under various conditions: in the presence of oxygen, in different amount of water vapour and in volatile organic products (VOCs), all at temperature of 90°C. Conditions were chosen in such a way that it mimicked real conditions of textiles' storing during exhibitions and in show cases. The influence of temperature, moisture and VOCs content on the state of silk textiles was examined with the use of size exclusion chromatography. Pseudo-zero-order Ekenstam equation was applied to study degradation rates of fibroin with use of the approximated values of DP of fibroin.

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Photochemical behaviour of natural silk—I. Kinetic investigation of photoyellowing

Cited by 39 publications

References 12 publications

Natural and Artificial Weathering of B.mori Silk Fabric

Natural and Artificial Weathering of B.mori Silk Fabric

Application of Electron Paramagnetic Resonance and Solid-state 13C Nuclear Magnetic Resonance of Cross-polarization/Magic Angle Spinning to Study Enzymatic Degradation of Silk Fabrics

Evaluating the impact of different exogenous factors on silk textiles deterioration with use of size exclusion chromatography

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