Photoprotection by Silk Cocoons

Kaur, Jasjeet; Rajkhowa, Rangam; Tsuzuki, Takuya; Millington, Keith R.; Zhang, Jin; Wang, Xungai

doi:10.1021/bm401023h

Cited by 74 publications

(59 citation statements)

References 38 publications

(75 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been reported that similar spectral signatures at ∼28,985 cm

^{- 1}

(∼345 nm) are observed for sericin solutions extracted from A. pernyi silks, with significant variations in UV spectral response of sericin from different silks [51]. The brown pigmentation of certain wild silks has also been hypothesised as resulting from ∼21,740 cm

^{- 1}

(460 nm) absorbing chromophores created through UV photo-oxidation of tyrosine residues, which may play a part in UV protection of the silk cocoon in its pupal stage [51]. …”

Section: Resultsmentioning

confidence: 88%

“…It is typical for proteins in natural bio-materials and is related to

π ⟶ π^{*}

transitions in amino acids that have aromatic rings such as tyrosine, phenylalanine, tryptophan and histidine. Residues of tyrosine in particular have been shown to account for a significant portion of absorption in the 15,800 cm

^{- 1}

(280 nm) region [50,51]. A remnant of sericin in the degummed fibers has a signature with its absorption band at 42,550–46,500 cm

^{- 1}

(215–235 nm) (FWHM) wavelengths [52].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Silk: Optical Properties over 12.6 Octaves THz-IR-Visible-UV Range

et al. 2017

Self Cite

View full text Add to dashboard Cite

Domestic (Bombyx mori) and wild (Antheraea pernyi) silk fibers were characterised over a wide spectral range from THz 8 cm−1 (λ= 1.25 mm, f= 0.24 THz) to deep-UV 50×103 cm−1 (λ= 200 nm, f= 1500 THz) wavelengths or over a 12.6 octave frequency range. Spectral features at β-sheet, α-coil and amorphous fibroin were analysed at different spectral ranges. Single fiber cross sections at mid-IR were used to determine spatial distribution of different silk constituents and revealed an α-coil rich core and more broadly spread β-sheets in natural silk fibers obtained from wild Antheraea pernyi moths. Low energy T-ray bands at 243 and 229 cm−1 were observed in crystalline fibers of domestic and wild silk fibers, respectively, and showed no spectral shift down to 78 K temperature. A distinct 20±4 cm−1 band was observed in the crystalline Antheraea pernyi silk fibers. Systematic analysis and assignment of the observed spectral bands is presented. Water solubility and biodegradability of silk, required for bio-medical and sensor applications, are directly inferred from specific spectral bands.

show abstract

“…It has been reported that similar spectral signatures at ∼28,985 cm

^{- 1}

^{- 1}

(460 nm) absorbing chromophores created through UV photo-oxidation of tyrosine residues, which may play a part in UV protection of the silk cocoon in its pupal stage [51]. …”

Section: Resultsmentioning

confidence: 88%

“…It is typical for proteins in natural bio-materials and is related to

π ⟶ π^{*}

^{- 1}

(280 nm) region [50,51]. A remnant of sericin in the degummed fibers has a signature with its absorption band at 42,550–46,500 cm

^{- 1}

(215–235 nm) (FWHM) wavelengths [52].…”

Section: Resultsmentioning

confidence: 99%

Silk: Optical Properties over 12.6 Octaves THz-IR-Visible-UV Range

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…Sericin film increases the proliferation of human skin keratinocytes and fibroblasts, and it accelerates wound healing [49]. Sericin also has antimicrobial, antioxidant, and photo-protective ability from ultraviolet radiation, so it has been effectively used as a dressing material for skin protection [50,51]. Sericin shows potential as a bone tissue engineering scaffolding material.…”

Section: Sericinmentioning

confidence: 99%

Silk Protein-Based Membrane for Guided Bone Regeneration

Kwon

Seok

2018

Applied Sciences

View full text Add to dashboard Cite

Silk derived from the silkworm is known for its excellent biological and mechanical properties. It has been used in various fields as a biomaterial, especially in bone tissue engineering scaffolding. Recently, silk protein-based biomaterial has been used as a barrier membrane scaffolding for guided bone regeneration (GBR). GBR promotes bone regeneration in bone defect areas using special barrier membranes. GBR membranes should have biocompatibility, biodegradability, cell occlusion, the mechanical properties of space-making, and easy clinical handling. Silk-based biomaterial has excellent biologic and mechanical properties that make it a good candidate to be used as GBR membranes. Recently, various forms of silk protein-based membranes have been introduced, demonstrating excellent bone regeneration ability, including osteogenic cell proliferation and osteogenic gene expression, and promoting new bone regeneration in vivo. In this article, we introduced the characteristics of silk protein as bone tissue engineering scaffolding and the recent application of such silk material as a GBR membrane. We also suggested future studies exploring additional uses of silk-based materials as GBR membranes.

show abstract

“…Ultraviolet radiation (UVR) introduces free radical oxidative stress to organisms and biological materials, resulting in damaged cellular components including DNA and proteins (Tyrrell, 1995;Osaki and Osaki, 2011;Kaur et al, 2013;Matsuhira et al, 2013). Marine and terrestrial organisms have adapted to prevent and cope with such UVR exposure and damage.…”

Section: Introductionmentioning

confidence: 99%

The impact of UVB radiation on the glycoprotein glue of orb-weaving spider capture thread

Stellwagen

Opell

Clouse

2015

Journal of Experimental Biology

View full text Add to dashboard Cite

Many spider orb-webs are exposed to sunlight and the potentially damaging effects of ultraviolet B (UVB) radiation. We examined the effect of UVB on the viscoelastic glycoprotein core of glue droplets deposited on the prey capture threads of these webs, hypothesizing that webs built by species that occupy sunny habitats are less susceptible to UVB damage than are webs built by species that prefer shaded forest habitats or by nocturnal species. Threads were tested shortly after being collected in the early morning and after being exposed to UVB energy equivalent to a day of summer sun and three times this amount. Droplets kept in a dark chamber allowed us to evaluate post-production changes. Droplet volume was unaffected by treatments, indicating that UVB did not damage the hygroscopic compounds in the aqueous layer that covers droplets. UVB exposure did not affect energies of droplet extension for species from exposed and partially to mostly shaded habitats (Argiope aurantia, Leucauge venusta and Verrucosa arenata). However, UVB exposure reduced the energy of droplet extension in Micrathena gracilis from shaded forests and Neoscona crucifera, which forages at night. Only in L. venusta did the energy of droplet extension increase after the dark treatment, suggesting endogenous molecular alignment. This study adds UVB irradiation to the list of factors (humidity, temperature and strain rate) known to affect the performance of spider glycoprotein glue, factors that must be more fully understood if adhesives that mimic spider glycoprotein glue are to be produced.

show abstract

Photoprotection by Silk Cocoons

Cited by 74 publications

References 38 publications

Silk: Optical Properties over 12.6 Octaves THz-IR-Visible-UV Range

Silk: Optical Properties over 12.6 Octaves THz-IR-Visible-UV Range

Silk Protein-Based Membrane for Guided Bone Regeneration

The impact of UVB radiation on the glycoprotein glue of orb-weaving spider capture thread

Contact Info

Product

Resources

About