Department of Chemical Sciences, University of Naples "Federico II", Italy; Department of Chemistry and Polymer Science, University of Stellenbosch, Stellenbosch, South Africa.
Institute for Polymers, Composites and Biomaterials, National Research Council, Italy.
Carbohydr Polym. 2020 Feb 15;230:115627. doi: 10.1016/j.carbpol.2019.115627. Epub 2019 Nov 15.
In this study, chitosan (C) tripolyphosphate (T) sub-micro particles containing ungeremine (CTUn), an alkaloid particularly active against Penicilliumroqueforti, a fungus responsible of the bakery products deterioration, were prepared through external gelation crosslinking process. The particles were included in a thermoplastic starch based polymer Mater-Bi (MBi), and MBi/CTUn bioactive biocomposites were obtained. The films showed bioactivity against P. roqueforti. In particular, the bioassays were performed on films with different concentration of CTUn and at different pH values. CTUn particles influenced MBi crystallization (DSC analysis) and promoted thermal degradation of MBi starch component (TGA). Morphological analysis confirmed even distribution of sub-micro particles into the polymeric matrix. Water permeability slightly increased, as expected, whereas oxygen permeability decreased. Tensile tests showed CTUN sub-microparticles improved rigidity and tensile strength of the films at the expense of ductility. Finally, MBi/CTUn biocomposites evidenced interesting performances potentially exploitablein bioactive bakery based food packaging materials.
在这项研究中，通过外部凝胶交联过程制备了含有格尔曼宁（CTUn）的壳聚糖（C）三聚磷酸酯（T）亚微颗粒，格尔曼宁是一种生物碱，对导致烘焙产品变质的青霉有特别的活性。将颗粒包含在热塑性淀粉基聚合物 Mater-Bi（MBi）中，并获得 MBi/CTUn 生物活性生物复合材料。这些薄膜对青霉表现出生物活性。特别是，在不同 CTUn 浓度和不同 pH 值下进行了生物测定。CTUn 颗粒影响了 MBi 的结晶（DSC 分析）并促进了 MBi 淀粉成分的热降解（TGA）。形态分析证实了亚微颗粒在聚合物基质中的均匀分布。如预期的那样，水渗透性略有增加，而氧气渗透性降低。拉伸试验表明，CTUN 亚微颗粒提高了薄膜的刚性和拉伸强度，而牺牲了延展性。最后，MBi/CTUn 生物复合材料表现出了有趣的性能，有望在基于生物活性的烘焙食品包装材料中得到利用。
