Student Research Committee, Faculty of Nutrition and Food Science, Tabriz University of Medical Sciences, Tabriz, Iran.
Nutrition Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
Int J Biol Macromol. 2021 Jul 31;183:753-759. doi: 10.1016/j.ijbiomac.2021.04.163. Epub 2021 Apr 28.
Recently, the improvement of gelatin-based films for usage in food packaging has attracted more attention owing to their non-toxicity, biodegradability, availability, and renewability. In the current study, the improved gelatin-based films were produced using covalent interaction through dialdehyde kappa-carrageenan (DAK-car) and thymol-loaded zein nanoparticle content. The influences of DAK-car into the matrix of gelatin films (GEL) on the structural, total soluble matter (TSM), moisture content (MC), and water vapor permeability (WVP), and mechanical properties were investigated. After the formation of covalent crosslinking amongst the amino groups of GEL and the dialdehyde groups of DAK-car with the blending ratio of 1:2 (GEL 4% w/v): (DAK-car 1% w/v), a remarkably (p < 0.05) reduction was saw in TSM, MC, and WVP of film. The tensile strength of this film (72.26 ± 0.3 MPa) was ~20-fold higher compared with pure GEL film. It should also be noted that the presence of zein nanoparticles (ZNPs) did not have a notably effect on improving the attributes of gelatin-based film. However, the presence of thymol in concentrations of 0.25 and 0.5 mg/mL showed acceptable antioxidant and antimicrobial activities. As a result, GEL/DAK-car with blending ratio of 1:2 containing thymol-loaded ZNPs films demonstrated the valuable potential for application in active food packaging.
最近，由于明胶的无毒、可生物降解、可利用性和可再生性，基于明胶的薄膜在食品包装中的应用得到了更多的关注。在本研究中，通过醛基卡拉胶（DAK-car）和载有百里香酚的玉米醇溶蛋白纳米粒子的共价相互作用，制备了改良的基于明胶的薄膜。研究了 DAK-car 对明胶薄膜（GEL）基质的影响，包括结构、总可溶物（TSM）、水分含量（MC）、水蒸气透过率（WVP）和机械性能。当 GEL 中的氨基与 DAK-car 的醛基以 1:2 的比例（GEL 4% w/v）：（DAK-car 1% w/v）形成共价交联时，薄膜的 TSM、MC 和 WVP 显著降低（p < 0.05）。该薄膜的拉伸强度（72.26 ± 0.3 MPa）比纯 GEL 薄膜高约 20 倍。还应该注意到，玉米醇溶蛋白纳米粒子（ZNPs）的存在并没有显著改善明胶基薄膜的性能。然而，以 0.25 和 0.5 mg/mL 浓度存在的百里香酚表现出了良好的抗氧化和抗菌活性。因此，含有 1:2 比例的 DAK-car 和载有百里香酚的 ZNPs 的 GEL 薄膜具有应用于活性食品包装的潜在价值。
