The influence of UV radiation on silk fibroin

Effect of UV-light on the uniaxial tensile properties and structure of uncoated and TiO2 coated Bombyx mori silk fibers

“…The FT-IR results also revealed that the absorbance values of Amide I, II, and III bands emerging from b-sheet crystalline regions and random coil conformations in amorphous regions show generally a slightly decreasing tendency in both uncoated and TiO 2 coated silk fibers. This effect is probably due to the weakening and/or breaking of peptide bonds in polypeptide chains as shown in the study done on the silk fibroin films [39].…”

“…Amide III mode for random-coil conformation and b-sheet conformation were observed at 1235 and 1256 cm À1 [33,34,37]. The band observed at 1441 cm À1 is assigned to dCH 2 scissoring [31,33,38,39].…”

“…Another peak observed at 3075 cm À1 was attributed to N-H stretch of Amide B mode [33]. Besides, a broad peak attributed to the NH stretching of peptide groups, namely, Amide A band was observed at 3279 cm À1 [31,33,39].…”

Microbial Degradation of Woven Fabrics and Protection Against Biodegradation

“…Wool and silk are also susceptible to photochemical degradation, particularly in the presence of oxygen -for example the photodegradation of fibroin in silk occurs as a result of the breakage of hydrogen bonds and oxidation of tyrosine. Biodegradation of silk may be favoured by prior photodegradation under the action of ultraviolet (Sionkowska & Planecka, 2011). The action of infrared radiation on textile material causes overheating of the surface and leads to many physicochemical changes.…”

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

“…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].…”