2010
DOI: 10.3390/polym2040719 View full text |Buy / Rent full text
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Abstract: Abstract:The aim of this study was to prepare and characterize membranes of silk fibroin (SF) and chitosan (CHI) blends. Moreover, a conformation transition of SF to a more stable form induced by the addition of CHI was verified. Blend membranes were prepared, after pH adjustment, in different ratios, and physical integrity, crystallinity, structural conformation and thermal stability were characterized. The results of crystallographic analysis (XRD) indicated the tendency to higher structural organization cau… Show more

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“…SF can assume distinct conformations; α-helix and random-coil conformations (also called silk I) and the β-sheet conformation (silk II). Silk I is a metastable form that is soluble in water and silk II is insoluble in water and is the most stable structure, where SF chains are connected by hydrogen bonds between the adjacent segments of polypeptide chains 5 , 15 - 17 …”
Section: Introductionmentioning
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“…SF can assume distinct conformations; α-helix and random-coil conformations (also called silk I) and the β-sheet conformation (silk II). Silk I is a metastable form that is soluble in water and silk II is insoluble in water and is the most stable structure, where SF chains are connected by hydrogen bonds between the adjacent segments of polypeptide chains 5 , 15 - 17 …”
Section: Introductionmentioning
“…Subsequently, we washed the SF extract with distilled water and dissolved it in a solution of CaCl 2 , H 2 O and CH 3 CH 2 OH 1:8:2 molar between 45 °C and 55 °C for one hour [19][20][21]. The solution underwent a dialysis process, with distilled water in cellulose acetate membranes for five days to remove the inorganic salts remaining from the previous processes.…”
Section: B Fibroin (Sf) Preparation and Characterizationmentioning
“…Therefore, according to thermal degradation temperature ( Figure 8) the randomly distributed SF was used in this work. 24 .…”
Section: 5-tensile Testingmentioning