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Articles by K. Nuanchai
Total Records ( 2 ) for K. Nuanchai
  K. Nuanchai , S. Prasong and S. Wilaiwan
  Proteolytic activity of protease XXIII on Silk Fibroin (SF) films was studied. The films were prepared from the SF solution by casting on the polystyrene plates and used as substrate for enzymatic degradation. The SF films were incubated with 1.0 mg mL-1 protease XXIII at 37°C up to 21 days. After incubation, those of secondary structure and thermal behavior of the SF films were investigated. FT-IR spectra indicated that the SF films predominantly β-structure. There was found that secondary structure of the films did not change even at 21 days of incubation times. However, slightly decreased of FTIR spectra were also observed by shoulder absorption peaks. The result suggested that some crystalline regions might be digested by the enzyme. This related to the thermal stability from thermogravimetric analysis since the SF films gradually decreased their thermal stability followed the increasing of time exposure to protease XXIII. It is a promising that protease XXIII could be digested SF and will be used this enzyme as a model system for enzymatic study on SF.
  S. Prasong , K. Nuanchai and S. Wilaiwan
  This study aimed to prepare Eri (Philosamia ricini) Silk Fibroin (SF)/chitosan (CS) blend films by a solvent evaporation method and to compare the blend films with both native SF and CS films. Influence of SF ratios on the morphology, secondary structure and thermal decomposition of the CS blend films were investigated. The native SF and CS films were uniform and homogeneous without phase separation. For the blend films, the uniform can be found less than 60% of SF composition. All of SF/CS blend films showed both SF and CS characteristics. FT-IR results showed that the blend films composed of both random coil and β-sheet with predominant of β-sheet form. Interaction of intermolecular between SF and CS have occurred which were measured by thermogravimetric thermograms. Increasing of SF contents was leading to the increase of β-sheet structures which were enhanced the thermal stability of the CS blend films.
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