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Articles by Y. Srisuwan
Total Records ( 4 ) for Y. Srisuwan
  M. Srisa-Ard , Y. Baimark and Y. Srisuwan
  In this study, influence of intermolecular interactions between Silk Fibroin (SF) and Poly (ε-Caprolactone) (PCL) in homogeneous blend form on SF conformation changes and thermal properties of the blends was investigated and discussed. The SF/PCL blends were prepared by solution blending and precipitating method, respectively. Dimethylsulfoxide and isopropanol were used as a solvent and a non-solvent, respectively. The blends were characterized by Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), Thermo Gravimetry (TG) and Scanning Electron Microscopy (SEM). Conformation transition of SF component from β-sheet to random coil forms can be induced by blending with PCL. Melting temperature and heat of melting of the PCL decreased as increasing the SF ratio. Thermal stability of the SF can be enhanced by blending with PCL. FTIR, DSC and TG results suggested that intermolecular hydrogen bonds were formed between SF and PCL molecules in the blends. Homogeneous morphology of blends was illustrated by SEM micrographs.
  Y. Srisuwan and P. Srihanam
  In this study, dissolution of Eri (Philosamia ricini) cocoons in different solutions was investigated and compared with Nang-Lai variety (Bombyx mori) cocoons. The Lithium Bromide (LiBr), calcium nitrate (Ca(NO3)2), Zinc chloride (ZnCl2), Lithium thiocyanate (LiSCN·xH2O), 85% phosphate and mixture (calcium chloride (CaCl2)/Ethanol/H2O; 1:2:8) solution systems were used. Efficiency of the dissolving solution was examined by measuring the percentage of dissolved silk. It was found that the Nang-Lai silk was completely dissolved in all solutions, whereas, Eri silk was slightly dissolved, except for 85% phosphate solution. The Fourier transform infrared spectroscopy (FTIR) spectra of the Eri silk film composed of β-sheet form than Nang Lai silk film. With thermogravimetric analysis, the Eri silk film showed two stages of thermal decompositions while the Nang-Lai silk was a single stage. In conclusion, thermal stability of the Eri silk was higher than the Nang-Lai silk.
  Y. Srisuwan , N. Narkkong and P. Srihanam
  This study aims to prepare Eri Silk Fibroin (SF) solution and construct of its film. The Eri cocoons were firstly removed of sericin and then dissolved by 6 M Ca(NO3)2. The SF solution was dialyzed before measurement of silk percentage by weight. The solvate protein was then taken to prepare of SF film using 0.5 and 1% weight. The 10 mL of SF solution was cast on the polystyrene plates, left in room temperature for 2 days. The obtained SF films were then observed under Scanning Electron Microscope (SEM) and Fourier transform infrared spectroscopy (FTIR) for morphological and conformational studies, respectively. The results found that Eri SF films were rougher surfaces than Bombyx mori (B. mori) SF film. In addition, the film of 0.5% weight SF solution was also rougher surfaces than 1% weight. It contained the α-helix structure in higher ratio than 1% weight film since the 1% weight SF solution film composed in higher β-sheet structure. However, the later conformation could affect the SF film to be more hard and brittle than low percent weight content.
  P. Srihanam , W. Simcheur and Y. Srisuwan
  This study aimed to prepare and characterize silk sericin and chitosan blend film as well as the native silk sericin and chitosan films. The films were observed their morphology using Scanning Electron Microscope (SEM). The secondary structures of the films were analyzed using Fourier Transform Infrared (FTIR) spectroscopy. Transparency of the films was investigated with UV-visible spectroscopy. The results found that all of silk films were smooth throughout the film surfaces, including blend film. This showed that silk sericin and chitosan very well compatible. However, phase separation is also being observed. It is show that the interaction between two materials might be miscible together. The FTIR results indicated that the most of films were composed both in random coil and β-sheet forms which predominantly of the random coil structures. The results suggesting the blend film between sericin and chitosan did not change the intramolecular structure when compared to the native films. The silk sericin and blend films were slightly yellowish color and were higher transparent than chitosan film. However, % transmittance at λmax of 660 nm showed that all of films have similar values. The result suggested that the transparency of the film did not change even blend together. It is a promising that both silk sericin and chitosan would be blended into many forms for applications in specifically fields.
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