Sandoval Laura N, López Monserrat, Montes-Díaz Elizabeth, Espadín Andres, Tecante Alberto, Gimeno Miquel, Shirai Keiko
Laboratory of Biopolymers and Pilot Plant of Bioprocessing of Agro-Industrial and Food By-Products, Biotechnology Department, Universidad Autónoma Metropolitana, Av. San Rafael Atlixco No. 186. Col. Vicentina, C.P., 09340 Mexico City, Mexico.
Departamento de Alimentos y Biotecnología, Facultad de Química, Universidad Nacional Autónoma de México, 04510 Mexico City, Mexico.
Molecules. 2016 Apr 8;21(4):469. doi: 10.3390/molecules21040469.
A chitosan from biologically obtained chitin was successfully grafted with d,l-lactic acid (LA) in aqueous media using p-toluenesulfonic acid as catalyst to obtain a non-toxic, biodegradable packaging material that was characterized using scanning electron microscopy, water vapor permeability, and relative humidity (RH) losses. Additionally, the grafting in chitosan with LA produced films with improved mechanical properties. This material successfully extended the shelf life of fresh cheese and inhibited the growth of Listeria monocytogenes during 14 days at 4 °C and 22% RH, whereby inoculated samples with chitosan-g-LA packaging presented full bacterial inhibition. The results were compared to control samples and commercial low-density polyethylene packaging.
使用对甲苯磺酸作为催化剂，在水性介质中成功地将从生物来源的几丁质获得的壳聚糖与d，l-乳酸（LA）接枝，以获得一种无毒、可生物降解的包装材料，该材料通过扫描电子显微镜、水蒸气透过率和相对湿度（RH）损失进行表征。此外，壳聚糖与LA的接枝产生了具有改善机械性能的薄膜。这种材料成功地延长了新鲜奶酪的保质期，并在4℃和22%RH条件下14天内抑制了单核细胞增生李斯特菌的生长，用壳聚糖-g-LA包装接种的样品呈现出完全的细菌抑制。将结果与对照样品和商业低密度聚乙烯包装进行了比较。
