研究目的
To investigate the properties of HPMC and titanium nanoparticle nanocomposites and their possible applications in the active packaging area, including the effect of different concentrations of nanoparticles on mechanical properties, water vapor permeability, and antibacterial activity.
研究成果
Incorporation of TiO2 nanoparticles into HPMC films improved mechanical and barrier properties, with lower concentrations providing better dispersion and performance. The nanocomposites showed enhanced hydrophobicity, thermal stability, and antibacterial activity, making them promising for active packaging applications to extend food shelf life.
研究不足
The study used specific concentrations of TiO2 nanoparticles (0.001 g/100 mL and 0.002 g/100 mL), which may not cover all possible ranges; dispersion issues at higher concentrations could affect homogeneity and properties; the antibacterial tests were limited to E. coli and S. aureus; industrial scalability of the casting method may require further optimization.
1：Experimental Design and Method Selection:
The study involved incorporating TiO2 nanoparticles into HPMC films via casting method to create nanocomposites, with investigations into structural, mechanical, surface properties, water solubility, tensile properties, contact angle, thermal stability, water vapor permeability, SEM morphology, and antibacterial activity.
2：Sample Selection and Data Sources:
HPMC (Methocel E15) and anatase TiO2 nanoparticles were used; guavas were sourced from a supermarket for packaging simulation.
3：List of Experimental Equipment and Materials:
Hydroxypropyl methylcellulose (Methocel E15), anatase TiO2, deionized water, ultrasound tip, ventilated oven, Instron Universal Testing Machine (Model 1122), contact angle meter (KSV Instruments), TA Instruments Q-500 TGA, Philips XL 30 FEG SEM, double-stick carbon tabs, gold/palladium coating, nutrient medium for microbiological analysis.
4：Experimental Procedures and Operational Workflow:
Preparation of TiO2 nanoparticle suspension using ultrasound, casting of films on acrylic plates and drying, measurements of water solubility, tensile properties, contact angle, thermal stability, water vapor permeability, SEM imaging, and disk diffusion tests for antibacterial activity.
5：Data Analysis Methods:
Statistical analysis with replicates (e.g., five for solubility, six for tensile properties), use of ASTM standards for tensile and WVP tests, image analysis for contact angle, and calculation of inhibition zones for antibacterial tests.
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