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Articles by Mangkorn Srisa-ard
Total Records ( 3 ) for Mangkorn Srisa-ard
  Pheeraya Chottanom , Mangkorn Srisa-ard , Sujitra Seehangkot and Namfon Rungram
  The objectives of this study was to study the influence of plant extract and starch on gelatin film properties and on rancidity stability of meat products. The effect of the extract was also compared to BHA antioxidant. Physical, functional and antioxidant properties of the films were measured. Development of rancidity parameters of the meat products kept in gelatin pouches was also determined. The extract and starch improved film strength but decreased water vapor resistance. Optical and color properties of film were significantly altered by the extract concentration. The film with extract and BHA exhibited antioxidant activity at 89.83 and 70.36% inhibitions, respectively and significantly decreased hydrolytic rancidity rate of the products. So, plant extract might modify some properties of the gelatin film but it could exhibit antioxidant activity on the gelatin film comparable to synthetic antioxidant. Then it will be a more promising natural additive to preserve meat products in gelatin packaging.
  Yaowalak Srisuwan , Mangkorn Srisa-ard , Chaiyasit Sittiwet , Yodthong Baimark , Nual- Anong Narkkong and Chirapha Butiman
  Nanocomposite and nanoporous silk fibroin (SF) films were prepared by film casting of SF solution containing surfactant-free colloidal nanoparticles of methoxy poly (ethylene glycol)-b-poly (D, L-lactide) diblock copolymer (MPEG-b-PDLL). Self-condensation and nanophase separation of the nanoparticles from SF film matrix during film drying process gave nanopore structures. The colloidal nanoparticles were prepared in SF solution by modified-spontaneous emulsification solvent diffusion method without any surfactant. The interaction between SF and MPEG-b-PDLL in nanocomposite films was studied by Fourier transform infrared spectroscopy and thermogravimetry. The film transparency of SF nanocomposite films decreased as increasing the MPEG-b-PDLL ratio. Scanning Electron Microscopy (SEM) results indicated that the nanoparticle sizes in the films were in the range of 50-200 nm with spherical shape. Nanopore structures with pore size of less than 150 nm can be observed from SEM images of the film surface and cross-section. The nanopores are interconnected throughout the nanocomposite films. The number and size of nanoparticles and nanopores increased when the MPEG-b-PDLL ratio was increased.
  Mangkorn Srisa-ard and Yodthong Baimark
  Influences of arm number and arm length of poly(D,L-lactide)s (PDLLs) on their thermal properties were investigated. The PDLLs with linear (1 arm) and star (4, 6 and 16 arms) shapes were synthesized via ring-opening polymerization of DLL monomer in bulk at 130°C for 24 h under nitrogen atmosphere. Stannous octoate was used as a catalyst. Initiators containing hydroxyl end groups of 1, 4, 6 and 16 were chosen as core molecules for synthesizing 1-, 4-, 6- and 16-armed PDLLs, respectively. Thermal properties of the PDLLs observed from their differential scanning calorimetric and thermogravimetric thermograms strongly depended upon their arm numbers and arm lengths. For the same DLL/initiator ratio (208/1 by mole), glass transition temperatures (Tg) and temperatures of maximum decomposition rate (Td, max) of the PDLLs decreased when the arm length decreased (or arm number increased). For similar PDLL arm lengths (4,500 and 4,900 g moL-1 for 6-armed star-shaped and 1-armed linear PDLLs, respectively), the Tg and Td, max of star-shaped PDLL was higher than that of the linear PDLL.
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