Food Packaging Group, School of Food and Nutritional Sciences, University College Cork, Western Road, Cork T12 K8AF, Ireland.
Reading Scientific Services Ltd., Reading Science Centre, Whiteknights Campus, Pepper Lane, Reading, Berkshire RG6 6LA, UK.
Int J Mol Sci. 2020 Apr 3;21(7):2486. doi: 10.3390/ijms21072486.
The objective of this study was to assess the ability of producing laminated edible films manufactured using the following proteins; gelatin (G), whey protein isolate (WPI) and polysaccharide sodium alginate (SA), and to evaluate their physical properties. Additionally, films' preparation employing these ingredients was optimized through the addition of corn oil (O). Overall, 8-types of laminated films (G-SA, G-WPI, SA-WPI, SA-G-WPI, GO-SAO, GO-WPIO, SAO-WPIO and SAO-GO-WPIO) were developed in this study. The properties of the prepared films were characterized through the measurement of tensile strength (TS), elongation at break point (EB), puncture resistance (PR), tear strength (TT), water vapour permeability (WVP) and oxygen permeability (OP). The microstructure of cross-sections of laminated films was investigated by scanning electron microscopy (SEM). Mechanical properties of films were dramatically enhanced through the addition of film layers. GO-SAO laminate showed the best barrier properties to water vapour (22.6 ± 4.04 g mm/kPa d m) and oxygen (18.2 ± 8.70 cm mm/kPa d m). SAO-GO-WPIO laminate film was the strongest of all laminated films tested, having the highest TS of 55.77 MPa, PR of 41.36 N and TT of 27.32 N. SA-G-WPI film possessed the highest elasticity with an EB value of 17.4%.
明胶（G）、乳清蛋白分离物（WPI）和多糖海藻酸钠（SA），并评估其物理性能。此外，通过添加玉米油（O）对这些成分制备的薄膜进行了优化。总的来说，本研究开发了 8 种层压薄膜（G-SA、G-WPI、SA-WPI、SA-G-WPI、GO-SAO、GO-WPIO、SAO-WPIO 和 SAO-GO-WPIO）。通过测量拉伸强度（TS）、断裂伸长率（EB）、抗穿刺性（PR）、撕裂强度（TT）、水蒸气透过率（WVP）和氧气透过率（OP）来表征制备薄膜的性能。通过扫描电子显微镜（SEM）研究了层压薄膜的横截面微观结构。通过添加薄膜层，显著提高了薄膜的机械性能。GO-SAO 层压板对水蒸气（22.6±4.04 g mm/kPa d m）和氧气（18.2±8.70 cm mm/kPa d m）具有最佳的阻隔性能。SAO-GO-WPIO 层压板是所有测试的层压板中最强的，其 TS 最高为 55.77 MPa、PR 为 41.36 N 和 TT 为 27.32 N。SA-G-WPI 薄膜具有最高的弹性，EB 值为 17.4%。
