Fabrication and structural characterization of electrospun nanofibres from Gonometa Postica and Gonometa Rufobrunnae regenerated silk fibroin

Mhuka, Vimbai; Dube, Simiso; Nindi, Mathew Muzi; Torto, Nelson

doi:10.1007/s13233-013-1127-1

Cited by 12 publications

(4 citation statements)

References 35 publications

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“…This implies that Cl − had a stronger ability to disrupt the hydrogen bonds of the crystalline structure. Br − and NO₃ − are more nucleophilic and ordinarily, should give higher solvation of the fiber than Cl − as was the case in work independently done by Mhuka and Addis [ 8 , 14 ]. In both their instances, it was observed that concentrated solutions of LiBr induced a significantly higher percentage solubility than either CaCl 2 or LiCl salts.…”

Section: Resultsmentioning

confidence: 98%

“…The electrospun nanofibers were water-soluble, whereas the degummed silk fibroin and films were insoluble. This was an indication of degradation of the crystalline structure of the fibroin which resulted in the loss of mechanical strength thus the water solubility [ 8 , 27 ]. Post treatment to induce crystallinity using methanol and water vapor annealing were investigated and the FTIR was used to determine conformational changes.…”

Section: Resultsmentioning

confidence: 99%

“…Sub-Saharan Africa is a host to various wild silk moths such as Gonometa postica , Gonometa rufobrunnae , Argema mimosa , and Anaphe panda . However, only a few studies have been carried out to explore the functionality and applicability of wild silks [ 8 , 9 ]. The traditional fabrication route typically involves dissolving SF in concentrated aqueous salts.…”

Section: Introductionmentioning

confidence: 99%

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A Comparative Study on the Dissolution of Argema mimosae Silk Fibroin and Fabrication of Films and Nanofibers

et al. 2021

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Limited studies have been done on silk fibroins of wild silkworm species owing to their relative insolubility in many solvents. In this study, the solubility of Argema mimosae wild silk fibroin in different salts (LiBr, LiCl, Ca(NO3)2, and CaCl2) dissolved in formic acid under varying temperatures was investigated. The dissolution conditions under which the solubility was optimum were optimized using a central composite design approach. The optimum range for solvation of the fibroin were visualized using contour plots. The influence of temperature and salt concentration were found to significantly influence the solvation of the fibroin. Following the successful dissolution of the fibroin, the regenerated silk fibroin solutions were cast to obtain water insoluble films which were used in investigating optimum electrospinning conditions. Average nanofiber diameters in the 110–141 nm range were obtained under optimum electrospinning conditions. The silk forms were characterized using the FTIR, TGA, XRD, and SEM to understand their properties. The investigations revealed that formic acid—salt solvents were effective in the solvation of the wild silk fibroin. Some of the dissolution conditions induced mild effects on the silk fibroin while others were harsh. Furthermore, processing to nanofibers resulted in the degradation of the β-sheets producing nanofibers rich in α-helices. However, post-treatment using methanol and water vapor were effective in restoring β-sheet crystallinity.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Comparative Study on the Dissolution of Argema mimosae Silk Fibroin and Fabrication of Films and Nanofibers

et al. 2021

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“…With over 400 species of wild silk-producing moths in the world, approximately eight types have been successfully beneficiated through various applications. The fabrication of an adsorbent based on silk fibroin presents an opportunity to exploit its physical and surface characteristics to adsorb selected PhACs and remove them from environmental samples [ 22 , 23 , 24 ]. Silk is an attractive material to explore as a potential low-cost adsorbent due to its biocompatibility and biodegradability after use.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Performance of Ball-Milled Silk Fibroin Films for Simultaneous Adsorption of Eight Pharmaceuticals from Water

Kgomo

Dube

Nindi

2022

IJERPH

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Pollutants mainly exist as multicomponent mixtures in the environment. Therefore, it is necessary to synthesize low-cost adsorbents that can simultaneously adsorb multiple compounds. This work presents the prospect of the adsorption of multiclass pharmaceuticals from the aqueous environment using an adsorbent derived from silk fibroin of the wild silkworm Argema mimosae. The adsorbent was prepared by dissolving degummed silk fibroin and the resultant solution was cast to obtain films that were ball-milled to powder. FTIR results revealed bands corresponding to N-H and C=O stretching vibrations. Particle size distribution data generally showed two size groups in the range of 50–90 nm and 250–625 nm. The study focused on the adsorptive removal of multiple compounds consisting of eight pharmaceuticals representing various classes including a β-blocker (pindolol), anesthetic (lidocaine), stimulant (caffeine), antiviral (nevirapine), steroid (estriol), anti-epileptic (carbamazepine), and a non-steroidal anti-inflammatory drug (naproxen). The adsorption process was best fitted to the pseudo-second-order isotherm and an overall match to the Freundlich model. Thermodynamic parameters suggested that the process was mainly exothermic and more spontaneous at lower temperatures. The performance of the adsorbent was further evaluated using environmental waters and the adsorbent demonstrated good potential for simultaneous adsorption of multicomponent pharmaceuticals.

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Biological applications of biogenic silk fibroin–chitosan blend zinc oxide nanoparticles

et al. 2023

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Fabrication and structural characterization of electrospun nanofibres from Gonometa Postica and Gonometa Rufobrunnae regenerated silk fibroin

Cited by 12 publications

References 35 publications

A Comparative Study on the Dissolution of Argema mimosae Silk Fibroin and Fabrication of Films and Nanofibers

A Comparative Study on the Dissolution of Argema mimosae Silk Fibroin and Fabrication of Films and Nanofibers

Evaluating the Performance of Ball-Milled Silk Fibroin Films for Simultaneous Adsorption of Eight Pharmaceuticals from Water

Biological applications of biogenic silk fibroin–chitosan blend zinc oxide nanoparticles

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