Control of gas permeability by transforming the molecular structure of silk fibroin in multilayered nanocoatings for CO2 adsorptive separation

2019 ◽  
Vol 573 ◽  
pp. 554-559 ◽  
Author(s):  
Moonhyun Choi ◽  
Jiwoong Heo ◽  
Hyunyoung Kim ◽  
Sang Wook Kang ◽  
Jinkee Hong
Keyword(s):  
Molecular Structure ◽  
Silk Fibroin ◽  
Gas Permeability ◽  
Adsorptive Separation

The Effect of Gamma Ray on the Mechanical and Molecular Structure Changes of Silk Fibroin

2012 ◽  
Vol 502 ◽  
pp. 269-272
Author(s):  
Huan Yu Jin ◽  
Hua Yin ◽  
Yu Liu ◽  
Yan An
Keyword(s):  
Molecular Structure ◽  
Silk Fibroin ◽  
Gamma Ray ◽  
Hot Spot ◽  
Basic Material ◽  
Future Research ◽  
Structure Changes ◽  
The Future ◽  
Long Time ◽  
Accelerate Degradation

Silk fibroin is regarded as a biomaterial for a long time. The fantastic biocompatibility of silk fibroin makes it a hot spot in the biomedical area and many researches has chosen it as a basic material to create new biomaterials. However, it has a long biodegradation period in body. Gamma ray is a method to accelerate degradation of other material in some experiments. This research combines silk fibroin with gamma ray and tries to figure out whether gamma ray can make the biodegradation of silk fibroin shorten. In this article, we give various doses of gamma ray to silk fibroin films and take some measurements about the mechanical and molecular structure of post-radiated silk fibroin, thus to choose an appropriate dose for the future research.

scholarly journals Effect of molecular structure on the gas permeability of cellulose aliphatate esters

2013 ◽  
Vol 32 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Jing Chen ◽  
Jin-ming Zhang ◽  
Ye Feng ◽  
Jia-song He ◽  
Jun Zhang
Keyword(s):  
Molecular Structure ◽  
Gas Permeability

scholarly journals Fabrication and Characterization of Silk Fibroin/Curcumin Sustained-Release Film

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3340 ◽  
Author(s):  
Xiaoning Zhang ◽  
Zhenyu Chen ◽  
Hong Bao ◽  
Jianwei Liang ◽  
Shui Xu ◽  
...  
Keyword(s):  
Sustained Release ◽  
Silk Fibroin ◽  
Gas Permeability ◽  
Transmission Rate ◽  
Chemical Properties ◽  
Wound Dressings ◽  
Fabrication And Characterization ◽  
Physical And Chemical ◽  
And Chemical Properties

In the present work, a sustained-release film composed of silk fibroin (SF), curcumin (Cur), glutaraldehyde (GA), and glycerol (Gly) was prepared successfully for wound dressings. Features relevant to wound dressings of SF/Gly/GA/Cur film were assessed. Physical and chemical properties of the fabricated materials were also characterized. The results showed that the prepared SF/Gly/GA/Cur film demonstrated a good sustained-release performance, flexibility, and gas permeability. In addition, it was found that the prepared SF/Gly/GA/Cur film possessed the capability to effectively inhibit the growth of bacteria and prevent bacterial penetration with a suitable water vapor transmission rate. Furthermore, the prepared composite film was non-cytotoxic, which makes it an ideal material for wound dressings.

Special features of the molecular structure and gas permeability of hollow polypropylene fibres

1989 ◽  
Vol 31 (8) ◽  
pp. 1825-1832
Author(s):  
V.G. Andreyev ◽  
A.Sh. Goikhman ◽  
G.A. Budnitskii
Keyword(s):  
Molecular Structure ◽  
Gas Permeability ◽  
Polypropylene Fibres

Studies on the Deterioration of the Cordon of the Most Illustrious Order of Chulachomklao

2017 ◽  
Vol 757 ◽  
pp. 24-28
Author(s):  
Kanidtha Chuapanit ◽  
Radchada Buntem
Keyword(s):  
Molecular Structure ◽  
Amino Acids ◽  
Ftir Spectroscopy ◽  
Silk Fibroin ◽  
X Ray Diffraction ◽  
X Ray ◽  
Golden Thread ◽  
Severe Deterioration ◽  
Degree Of Degradation

The Cordon of the Most Illustrious Order of Chulachomklao was one of the insignia that King Rama the fifth gave to the ladies of the court to present their goodness. One component of this object was made from silk and decorated by needled the silvered and golden thread as the laurel and the initial of King’s royal name. This ancient silk suffers from discoloration, low strength and severe deterioration. Amino acids in fibroin were photo-degraded under UV-irradiation and heat. Three silk samples, S-Raw, S-White and S-Ancient, were selected for ATR-FTIR and XRD analyses. FTIR spectroscopy can be used for the determination of the molecular structure of silk fibroin. The characteristic bands of silk fibroin corresponding to amide I, II, and III were found in all silk samples. The skeletal vibrations were also observed. Two degradation estimators, EAmideI/II and EcC=O2 were calculated and used to qualitatively estimate the degree of degradation due to oxidation and crystallinity of silk fibroin respectively. The results showed the higher degree of degradation and lower crystallinity of A-Ancient. The X-ray diffraction of S-Ancient showed the broader and weaker characteristic peaks at 2 theta of ∼ 20o indicating the lower crystallinity.

Molecular Structure of the Outermost Cell Wall Component of Spirillum Serpens

1977 ◽  
Vol 35 ◽  
pp. 342-343
Author(s):  
Wah Chiu ◽  
David Grano
Keyword(s):  
Molecular Structure ◽  
Cell Wall ◽  
Outer Membrane ◽  
Gel Electrophoresis ◽  
Electron Microscopic Examination ◽  
Electron Microscopic ◽  
Cell Wall Component ◽  
Protein Components ◽  
Exposure Technique ◽  
Structural Aspects

The periodic structure external to the outer membrane of Spirillum serpens VHA has been isolated by similar procedures to those used by Buckmire and Murray (1). From SDS gel electrophoresis, we have found that the isolated fragments contain several protein components, and that the crystalline structure is composed of a glycoprotein component with a molecular weight of ∽ 140,000 daltons (2). Under an electron microscopic examination, we have visualized the hexagonally-packed glycoprotein subunits, as well as the bilayer profile of the outer membrane. In this paper, we will discuss some structural aspects of the crystalline glycoproteins, based on computer-reconstructed images of the external cell wall fragments.The specimens were prepared for electron microscopy in two ways: negatively stained with 1% PTA, and maintained in a frozen-hydrated state (3). The micrographs were taken with a JEM-100B electron microscope with a field emission gun. The minimum exposure technique was essential for imaging the frozen- hydrated specimens.

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