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Effect of Residual Lithium Ions on the Structure and Cytotoxicity of Silk Fibroin Film
양예솔,곽효원,이기훈 한국잠사학회 2013 International Journal of Industrial Entomology Vol.27 No.2
Dialysis is the rate-limiting step in the preparation of aqueous silk fibroin (SF) solution. However, the traditional practice of dialyzing SF solution for at least 48 h to remove LiBr is notbased on empirical evidence. The aim of the present study was to systematically measure LiBrcontent in SF solutions dialyzed for varying lengths of time and assess the potential toxicity ofresidual lithium ions in cells. Complete removal of lithium ions was not achieved even after 72h of dialysis, with a residual lithium ion content in the solution of 22.85 mg/l. SF films preparedfrom solutions dialyzed for 8 and 24 h had predominantly random coil or b-sheet structures,respectively. The residual lithium had little cytotoxicity in NIH3T3 fibroblast cells, but viabilitywas compromised in cells grown on SF film prepared from solution dialyzed for 24 h.
Recovery of Silk Sericin from Soap-Alkaline Degumming Solution
양예솔,이상미,이한솔,이기훈 한국잠사학회 2013 International Journal of Industrial Entomology Vol.27 No.1
Sericin is usually abandoned after the degumming process. However, it could be a valuable bioresource if an economically efficient recovery process could be set up. In this study, sericin was recovered directly from the degummed waste solution by adding calcium chloride, which induced the precipitation of the surfactant, sodium oleate, by charge interaction. The recovery yield was maximum when 10% of calcium chloride was added. Further increase in the calcium chloride concentration induced the precipitation of sericin. The recovered sericin had a molecular weight distribution similar to that of the hot-water-extracted sericin; but some highmolecular- weight sericin could not be recovered. The secondary structure and amino acid composition of the recovered sericin were similar to those of conventional hot-water-extracted sericin. We expect that sericin recovered from the degummed waste solution could be an alternative to the hot-water-extracted sericin, which is widely used in various applications.
Chromium(VI) Adsorption Behavior of Silk Sericin Beads
곽효원,양예솔,김무곤,이정윤,윤혜성,김민화,이기훈 한국잠사학회 2013 International Journal of Industrial Entomology Vol.26 No.1
Silk sericin (SS) has been fabricated into beads using a 1 M LiCl/DMSO solvent and utilizedas a heavy metal adsorbent. Among the various heavy metals, we targeted Cr(VI) foradsorption using SS beads and found that its adsorption depended on the coagulant usedfor the fabrication of the SS beads. When methanol was used as a coagulant, the beads hada better adsorption capacity than when ethanol was used except at pH 1. The adsorptionbehavior of Cr(VI) on the SS beads followed the BET isotherm. The maximum adsorptioncapacity was 33.76 mg/g at pH 2. The adsorption of Cr(VI) was confirmed by FT-IR and EDSanalyses. Finally, the desorption was carried out using NaOH solution, and it was found that73.19% of the adsorbed Cr(VI) could be detached.