PSU Knowledge Bank Community:
http://kb.psu.ac.th:80/psukb/handle/2553/3809
2024-03-29T15:20:39ZSynthesis and characterization of silica hybrid coating materials for poly (lactic acid) film
http://kb.psu.ac.th:80/psukb/handle/2016/19012
Title: Synthesis and characterization of silica hybrid coating materials for poly (lactic acid) film
Authors: Fan Wu
Abstract: Silica/poly(lactic acid) hybrid materials were synthesized by sol-gel method and used as coating materials in order to improve the oxygen and water vapor barrier property of, poly(lactic acid), PLA films. The mixtures of Tetraethoxysilane (TEOS) and Triethoxyvinylsilane (VTES), containing a reactive double bond, were used as the inorganic silicate precursors to construct the siloxane network structure by co-hydrolysis and polycondensation reaction. Polymerization of the unsaturated bonds occurred by UV irradiation, as evidenced by sharp decrease of FTIR band at 1600 cm1, corresponding to terminal C-C stretching bond. PLA and 3-Isocyanatopropyl- triethoxysilane (ICPTES) were used as an organic polymer and a silane coupling agent, respectively. FTIR absorption band at 1550 cm1 was specified to the formation of amine groups (-NH), due to isocyanate groups in ICPTES reacting with hydroxyl groups in PLA chains. SEM was indicated that there were big cracks on the surface of coating materials without ICPTES. The water vapor barrier property of coated film showed a great improvement by 24.6% at the VTES/ TEOS ratio of 1: 1 (VT11), and the oxygen permeation coefficient (OPC) of VT11-coated film was decreased 24.8%, as compared to PLA neat film. The water contact angle of VT11-coated film decreased by 6.6%. XRD showed that the crystallinity of VT11-coated film was decreased after UV-irradiation for 1h. AFM also indicated that surface roughness of VT11-coated film decreased by 31.2% after UV-irradiation for 1h. Moreover, the water vapor barrier property was improved with the aging time increasing, because dense network structures were continuously generated after drying. In addition, UV- irradiated VT11-coated PLA film could retard the lipid oxidation more effective than PLA neat film and LDPE film. The film could be an alternative to maintain the quality and extend the shelf-life of shrimp crackers.
Description: Thesis (M.Sc., Packaging Technology)--Prince of Songkla University, 20182018-01-01T00:00:00ZProduction and properties od edible film from Mung Bean and Red Bean Proteins
http://kb.psu.ac.th:80/psukb/handle/2016/17792
Title: Production and properties od edible film from Mung Bean and Red Bean Proteins
Authors: Saowanit Keereekasetsuk
Description: Thesis (M.Sc., Packaging Technology)--Prince of Songkla University, 20082009-01-01T00:00:00Zการเตรียม สมบัติ และลักษณะเฉพาะของฟิล์มหลายชั้นที่เตรียมจากเจลาตินจากปลาและพอลิแลกติกเอซิด (พีแอลเอ)
http://kb.psu.ac.th:80/psukb/handle/2016/17665
Title: การเตรียม สมบัติ และลักษณะเฉพาะของฟิล์มหลายชั้นที่เตรียมจากเจลาตินจากปลาและพอลิแลกติกเอซิด (พีแอลเอ)
Authors: ธรรมนูญ โปรดปราน; พรอุษา จิตพุทธิ2563-01-01T00:00:00ZProperties and application of bilayer films based on poly (lactic acid) and fish gelatin containing epigallocatechin gallate fabricated by thermo-compression molding
http://kb.psu.ac.th:80/psukb/handle/2016/17662
Title: Properties and application of bilayer films based on poly (lactic acid) and fish gelatin containing epigallocatechin gallate fabricated by thermo-compression molding
Authors: Krisana Nilsuwan; Guerrero, Pedro; Caba, Koro de la; Soottawat Benjakul; Thummanoon Prodpran
Abstract: An alternative approach towards production of active bilayer films based on poly (lactic acid) (PLA) and fish gelatin incorporated with epigallocatechin gallate (EGCG) fabricated by thermo-compression molding was investigated. This strategy permitted the reduction of production times and avoided the uses of inorganic solvents. Thermo-compression molded bilayer films showed good handling, transparency and low water vapor permeability. The incorporation of EGCG promoted interactions with gelatin, as shown by Fourier transform infrared spectroscopy. These interactions contributed to homogeneous structures, as observed by scanning electron microscopy. Bilayer films with 12 wt % EGCG showed good mechanical properties, high water and UV–visible light barrier properties as well as a high DPPH radical scavenging activity. These bilayer films were used to produce bags, in which striped catfish slices (SCS) were packaged. After 7 days of storage at 4 °C, SCS packaged in bags prepared with12 wt % EGCG had lower psychrophilic bacteria count, weight loss, peroxide value, and thiobarbituric acid reactive substances (TBARS) value along with higher docosahexaenoic acid (C22:6 n-3) content than those packaged in bags prepared without EGCG or in LLDPE bags. No difference in overall likeness score was found among all the samples packaged in different bags after 7 days of storage. Therefore, PLA/gelatin bilayer films containing 12 wt % EGCG possessed satisfactory film properties with augmented antioxidant activity, and thus they could be used as active food packaging, especially for fish slices with high lipid content.2020-01-01T00:00:00Z