Universidad Surcolombiana, Departamento de Ingeniería Agrícola, Avenida Pastrana Borrero - Carrera 1, Neiva 410007, Colombia.
Newcastle University, School of Engineering, Claremont Road, Newcastle upon Tyne NE1 7RU, United Kingdom.
Carbohydr Polym. 2021 Nov 1;271:118429. doi: 10.1016/j.carbpol.2021.118429. Epub 2021 Jul 12.
This study investigated the impact of heterogeneity of crosslinking on a range of physical and mechanical properties of calcium alginate networks formed via external gelation with 0.25-2% sodium alginate and 2.5 and 5% CaCl. Crosslinking in films with 1-2% alginate was highly heterogeneous, as indicated by their lower calcium content (35-7 mg Ca·g alginate) and apparent solubility (5-6%). Overall, films with 1-2% alginate showed higher resistance (tensile strength = 51-147 MPa) but lower elasticity (Elastic Modulus = 2136-10,079 MPa) than other samples more homogeneous in nature (0.5% alginate, Elastic Modulus = 1918 MPa). Beads with 0.5% alginate prevented the degradation of β-carotene 1.5 times more efficiently than 1% beads (5% CaCl) at any of the storage temperatures studied. Therefore, it was postulated that calcium alginate networks crosslinked to a greater extent and in a more homogeneous manner showed better mechanical performance and barrier properties for encapsulation applications.
本研究考察了交联不均匀性对通过外部凝胶化形成的海藻酸钠网络的一系列物理和机械性能的影响，所用的海藻酸钠浓度为 0.25-2%，氯化钙浓度为 2.5 和 5%。1-2%海藻酸钠薄膜中的交联高度不均匀，其钙含量（35-7 mg Ca·g 海藻酸钠）和表观溶解度（5-6%）较低。总体而言，1-2%海藻酸钠薄膜的阻力（拉伸强度=51-147 MPa）较高，但弹性（弹性模量=2136-10079 MPa）较低，而其他样品的均匀性较高（0.5%海藻酸钠，弹性模量=1918 MPa）。在研究的任何储存温度下，0.5%海藻酸钠珠粒比 1%珠粒（5%氯化钙）更有效地防止 β-胡萝卜素降解 1.5 倍。因此，有人提出，交联程度更大且更均匀的海藻酸钙网络在封装应用中表现出更好的机械性能和阻隔性能。
