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Articles by Srisuwan Yaowalak
Total Records ( 3 ) for Srisuwan Yaowalak
  Simchuer Wilaiwan , Srisuwan Yaowalak , Baimark Yodthong and Srihanam Prasong
  This study aimed to prepare silk fibroin (SF)/gelatin (G) hybrid films by a solvent evaporation method for loading chlorhexidine diacetate (CHX). The SF and G solution in different ratios were mixed with CHX and placed on the 5 cm polystyrene plates before drying to obtain hybrid films. The films were determined their secondary structures and thermal properties by using Fourier transform infrared (FT-IR) spectrometer and thermogravimetric analysis (TGA), respectively. The results found that all of film composed of α-helix and β-sheet structures. However, differences of the α-helix and β-sheet structures were differed according to each component. The hybrid films showed soft texture and decreased of brittle compared to SF film only when the G content increased. Thermal properties of the films indicated that decomposition temperature profiles of all films did not differ dramatically, however, combination of characteristics both SF and G were appeared in hybrid films. The releasing rate of CHX-loaded in the films was found that the CHX has released from the SF film in higher rate than hybrid and G films, respectively. It is a promising that polarity, flexibility as well as component ratio of each polymer play important role on the releasing of CHX.
  Srihanam Prasong , Simchuer Wilaiwan and Srisuwan Yaowalak
  This study was aimed to study the surface morphology of Eri (Samia ricini) silk cocoons collected from different sources called China, Chaingmai, Lampoon, SIC (Silk Innovation Center) and Thai varieties. All of Eri silk fibers were prepared by hand. They were studied under scanning electron microscope (SEM) for morphological observation. The cross-section images showed China has composed of porous structures in higher ratios than Chaingmai and Lampoon, respectively. In contrast, SIC and Thai composed of nonporous structures. In addition, the effect of different organic solvents on each Eri silk fiber was also investigated. Eri silk fibers were treated with methanol, ethanol, ethyl acetate and methyl acetate in different incubation times and concentrations before examining with attenuated total reflection infrared (ATR-IR) spectroscopy. The results found that methanol showed the highest effect to change the structure of Eri fibers, compared to ethanol. Ethyl acetate and methyl acetate showed similar activity to enhance β-sheet form and lower than that of methanol and ethanol, respectively. The methanol concentrations and incubation times which suitable for China, Chaingmai, Lampoon, SIC and Thai were 40% (3 h), 40% (2 h), 60% (1 h), 60% (3 h) and 60% (3 h), respectively. From the results, SIC and Thai were considered as higher strength than those of China, Chaingmai and Lampoon. This was due to the fiber of the last group composed of porous structures in higher ratios than that of first group.
  Ong-chiari Watcharin , Srisuwan Yaowalak , Simcheur Wilaiwan and Srihanam Prasong
  This study aimed to prepare Silk Fibroin (SF) and Gelatin (G) blend film and study its morphology, secondary structure and thermal properties compared to native SF and G films. The films were prepared from the SF solution by casting on the polystyrene plates. They were investigated their secondary structure by fourier transform-infrared (FTIR) spectroscopy, morphology using Scanning Electron Microscope (SEM). In addition, Thermogravimetric Analysis (TG) and Differential TG (DTG) were used for thermal properties investigation. The results found that the SF/G blend film composed of both α-helix and β-sheet structures which were similar characteristics of the native SF and G. This result was similar to the TG and DTG analysis according to blending between SF and G is not enhancing thermal stability of the film. However, changes in some absorption bands and temperatures were also observed from the blend film. The result suggested that chemical interaction and hydrogen bonding between SF and G could be formed. The formation could be affected to the uniform of the surface throughout the film under SEM.
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