Efficient development of silk fibroin membranes on liquid surface for potential use in biomedical materials

Nanocomposite poly(D,L-lactide) (PDLL)-based microparticles containing silk fibroin (SF) nanoparticles were prepared by oil-in-water emulsification solvent evaporation technique of PDLL/SF nanocomposite. The PDLL/SF nanocomposite was obtained from nanoprecipitating SF into PDLL solution in acetone before dried in vacuum oven. The nanocomposite microparticles with PDLL/SF ratios of 20/1, 10/1 and 5/1 (w/w) were prepared and investigated. Interactions between PDLL and SF of microparticles can be observed from FT-IR and thermogravimetric results. Sizes of the SF nanoparticles and the nanocomposite microparticles from SEM micrographs were in the ranges of 50-500 nm and 50-200 µm, respectively. The sizes of SF nanoparticles and nanocomposite microparticles increased as increasing the SF ratio. Surface roughness of the resulted microparticles also increased with the SF ratio.

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Fast self-assembly of microporous silk fibroin membranes on liquid surface

International Journal of Biological Macromolecules ◽

10.1016/j.ijbiomac.2020.04.053 ◽

2020 ◽

Vol 156 ◽

pp. 633-639

Author(s):

Wenhao Chen ◽

Fei Li ◽

Lei Chen ◽

Yuanming Zhang ◽

Tonghua Zhang ◽

...

Keyword(s):

Silk Fibroin ◽

Self Assembly ◽

Liquid Surface

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Exploring the Acetone Evaporation and Airborne Neurotoxicity Bioassay against Adult Mosquito in the Enclosed Environment of Peet Grady Chamber

Jurnal Kimia Terapan Indonesia ◽

10.14203/jkti.v20i1.378 ◽

2018 ◽

Vol 20 (1) ◽

pp. 31-41

Author(s):

Jahangir Kamaldin ◽

Zairi Jaal

Keyword(s):

Linear Regression ◽

Organic Compounds ◽

Solid Surface ◽

Liquid Surface ◽

Adult Mosquito ◽

Vaporization Rate ◽

High Positive Correlation ◽

Volatile Organic ◽

Very High ◽

Potential Use

Mosquito has comprehensive and sensitive olfactory neuro-sensory located at antenna utilized for detecting airborne organic compounds in search of blood host. Mosquito is also known to have similar neurotransmitters function with human at neural synapses e.g. acetylcholinesterase, esterases and oxidases enzymes. Thus, there is potential use mosquito in predicting neurotoxicity of exogenic volatile organic compounds (VOC) e.g. manufactured acetone. Hence, the study evaluates the suitability to conduct bioassay of VOC neurotoxicity against mosquito in Peet Grady chamber that is commonly used for insecticidal bioassay. Acetone as the representative of VOC is easily evaporized at laboratory temperature of 26 to 29 °C without heating. The acetone evaporation profile on liquid surface and porous solid surface under the Peet Grady chamber is studied to ascertain the consistency of vaporization rate with homogenized distribution. The study showed the acetone has shown consistent vaporization rate of 23 mg/min from liquid surface and 116.3 mg/min from porous surface (filter paper) without heating, in a linear regression of very high positive correlation (r = 1.000) between time and mass of acetone vaporized. However, the non-homogenized distribution of acetone vapours in the Peet Grady chamber directly affected the accuracy to elucidate the neurotoxicity bioassay against mosquito in term of mosquito knockdown. The study suggests the positioning of mosquitoes in the Peet Grady chamber should be lower than the point of acetone vaporization, whereby the mosquitoes are knockdown by acetone vapours within the 20th minute upon reaching concentration of 170.3 to 196.1 ppm.

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Evaluation of Silk Fibroin Nanofibrous Dressing Incorporating Niosomal Propolis, for Potential Use in Wound Healing

Fibers and Polymers ◽

10.1007/s12221-021-0973-2 ◽

2021 ◽

Author(s):

Mahla Behyari ◽

Rana Imani ◽

Hamid Keshvari

Keyword(s):

Wound Healing ◽

Silk Fibroin ◽

Potential Use

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The growth of mica polytypes as studied by conventional and high-resolution TEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100074690 ◽

1983 ◽

Vol 41 ◽

pp. 174-177

Author(s):

A. Baronnet ◽

M. Amouric

Keyword(s):

Water Pressure ◽

Point Of View ◽

Temperature Fields ◽

Natural Occurrence ◽

Growth Mechanisms ◽

Long Period ◽

High Resolution Tem ◽

Layer Stacking ◽

Experimental Works ◽

Potential Use

The origin of mica polytypes has long been a challenging problem for crystal- lographers, mineralogists and petrologists. From the petrological point of view, interest in this field arose from the potential use of layer stacking data to furnish further informations about equilibrium and/or kinetic conditions prevailing during the crystallization of the widespread mica-bearing rocks. From the compilation of previous experimental works dealing with the occurrence domains of the various mica "polymorphs" (1Mr, 1M, 2M1, 2M2 and 3T) within water-pressure vs temperature fields, it became clear that most of these modifications should be considered as metastable for a fixed mica species. Furthermore, the natural occurrence of long-period (or complex) polytypes could not be accounted for by phase considerations. This highlighted the need of a more detailed kinetic approach of the problem and, in particular, of the role growth mechanisms of basal faces could play in this crystallographic phenomenon.

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