Optical properties of γ-irradiated<i>Bombyx mori</i>silk fibroin films

Madhukumar, R.; Asha, S.; Rao, B. Lakshmeesha; Sarojini, B. K.; Byrappa, K.; Wang, Youjiang; Sangappa, Y.

doi:10.1080/10420150.2015.1136309

Cited by 16 publications

(18 citation statements)

References 38 publications

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“…The light absorption by the silk protein polymer and its nanoparticle leads to the transition of electrons from the ground state to excited state [14,25]. The optical properties of Muga silk protein fibroin and nanoparticles synthesized by microwave methods were characterized by UV–vis.…”

Section: Resultsmentioning

confidence: 99%

“…[3,6,9–13]. These methods have various drawbacks like, a lengthy process, the use of chemicals and less yield, which led to introduction of other more resourceful methods, such as, radiolysis methods [3,14]. Radiolysis methods include plasma etching, electron irradiation, microwave synthesis and so on, of which microwave synthesis method is found to be more rapid, environment‐friendly, takes short reaction time, facile purification, improved production yield and undergoes controllable conditions [14–16].…”

Section: Introductionmentioning

confidence: 99%

“…The main interest of our present research work is to analyze the effect of microwave on the Muga silk protein for its conversion to nanoparticles. The interaction of microwave radiation with the polymer would lead to chain aggregation, chain scission, formation of double bonds, molecular, and electronic transitions [14]. Such internal defects would lead to the formation of induced centers that would make changes in the structure and optical bandgap in the silk protein solution.…”

Section: Introductionmentioning

confidence: 99%

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Spectroscopic analysis of Muga silk nanoparticles synthesized by microwave method

Asapur

Banerjee

Sahare

et al. 2020

Biotech and App Biochem

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Muga silk nanoparticles (MSNP) were synthesized using a microwave‐assisted radiolysis method. The effect of microwave on the Muga protein secondary structures was analyzed. The evolution of the secondary structure from random coils to the β‐sheets was determined by using FTIR, circular dichroism and X‐ray diffraction techniques. The results showed that Muga silk fibroin protein contained the primary structure in silk‐I state. When the protein was irradiated with microwave, nanoparticle synthesis was possible having silk‐II state imparting crystallinity. The silk nanoparticles were characterized by a particle size analyzer and found to be of ~240 nm in size. The optical properties of these nanoparticles were studied by UV–vis. spectroscopy and photoluminescence. For studying thermal properties, differential scanning calorimetry was performed that revealed early glass transition, which could be attributed to the presence of water and proteins. It also revealed that nanoparticles are thermally stable. Such studies are important for understanding more about the MSNP and would be beneficial for their further wide applications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spectroscopic analysis of Muga silk nanoparticles synthesized by microwave method

Asapur

Banerjee

Sahare

et al. 2020

Biotech and App Biochem

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“…Traditional sterilization techniques are often unsuitable: gamma radiation is inappropriate for silk fibroin while steam sterilization modifies the PCL properties, and ethylene oxide sterilization could determine the presence of toxic residues. Sterilization could cause MD brittleness with a reduction in mechanical strength and elasticity [ 98 ]. For some materials, the application of classic sterilization protocols could cause a loss of crosslinking degree and the consequent change of chemico-physical properties, the production of free radicals or a change in particle size, significantly affecting safety, efficacy and system quality.…”

Section: Definition Of the Quality Attributesmentioning

confidence: 99%

“…For some materials, the application of classic sterilization protocols could cause a loss of crosslinking degree and the consequent change of chemico-physical properties, the production of free radicals or a change in particle size, significantly affecting safety, efficacy and system quality. Although there are ASTM (American Society for Testing and Materials) standards for the sterilization of collagen, chitosan and hyaluronic acid, for many materials it remains to investigate which is the most suitable method to ensure the sterility assurance level (SAL) [ 12 , 98 ].…”

Section: Definition Of the Quality Attributesmentioning

confidence: 99%

Nanotechnology-Based Medical Devices for the Treatment of Chronic Skin Lesions: From Research to the Clinic

et al. 2020

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Chronic wounds, such as pressure ulcers, diabetic ulcers, venous ulcers and arterial insufficiency ulcers, are lesions that fail to proceed through the normal healing process within a period of 12 weeks. The treatment of skin chronic wounds still represents a great challenge. Wound medical devices (MDs) range from conventional and advanced dressings, up to skin grafts, but none of these are generally recognized as a gold standard. Based on recent developments, this paper reviews nanotechnology-based medical devices intended as skin substitutes. In particular, nanofibrous scaffolds are promising platforms for wound healing, especially due to their similarity to the extracellular matrix (ECM) and their capability to promote cell adhesion and proliferation, and to restore skin integrity, when grafted into the wound site. Nanotechnology-based scaffolds are emphasized here. The discussion will be focused on the definition of critical quality attributes (chemical and physical characterization, stability, particle size, surface properties, release of nanoparticles from MDs, sterility and apyrogenicity), the preclinical evaluation (biocompatibility testing, alternative in vitro tests for irritation and sensitization, wound healing test and animal wound models), the clinical evaluation and the CE (European Conformity) marking of nanotechnology-based MDs.

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N‐type silk fibroin/TiO₂ nanocomposite transparent films: electrical and optical properties

Yadav

Batra

Bansal

et al. 2021

Polymer International

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This paper highlights the effect of different concentrations of titanium dioxide (TiO2) nanoparticles on the electrical and optical properties of silk fibroin (SF). TiO2 based SF nanocomposite films were prepared using the solvent casting method. Uniform dispersion and agglomeration of nanoparticles, in nanocomposite films, were observed by field emission SEM. The conductivity of pure SF and nanocomposite films was determined by a four‐point probe and the TiO2 nanoparticles were found to bring high conductivity to the nanocomposite films. Dielectric strength improved with the addition of nanoparticles to the SF matrix. Dielectric constant and capacitance of the pure SF and nanocomposite films were measured using an LCR meter, which showed a 10‐fold enhancement on the addition of nanoparticles in SF. A very unusual property, i.e. negative resistance, was observed during LCR meter analysis for the nanocomposite films for a particular range of frequency (200–550 kHz), voltage (1 V) and current (0.5–1.5 μA). TiO2 nanoparticles changed the semiconducting behavior of the SF films from p‐type to n‐type as measured by the Hall effect experiment. The optical properties of pure SF and nanocomposite films were measured using a UV–visible spectrophotometer. The increased concentration of nanoparticles in the SF has effectively enhanced the absorbing coefficient, refractive index and percentage transmittance and reduced the bandgap energy. These SF/TiO2 nanocomposite films have shown the potential to be used as dielectric and high refractive index material for optoelectronics applications. © 2021 Society of Industrial Chemistry.

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Optical properties of γ-irradiatedBombyx morisilk fibroin films

Cited by 16 publications

References 38 publications

Spectroscopic analysis of Muga silk nanoparticles synthesized by microwave method

Spectroscopic analysis of Muga silk nanoparticles synthesized by microwave method

Nanotechnology-Based Medical Devices for the Treatment of Chronic Skin Lesions: From Research to the Clinic

N‐type silk fibroin/TiO₂ nanocomposite transparent films: electrical and optical properties

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Optical properties of γ-irradiatedBombyx morisilk fibroin films

Cited by 16 publications

References 38 publications

Spectroscopic analysis of Muga silk nanoparticles synthesized by microwave method

Spectroscopic analysis of Muga silk nanoparticles synthesized by microwave method

Nanotechnology-Based Medical Devices for the Treatment of Chronic Skin Lesions: From Research to the Clinic

N‐type silk fibroin/TiO2 nanocomposite transparent films: electrical and optical properties

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Product

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N‐type silk fibroin/TiO₂ nanocomposite transparent films: electrical and optical properties