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Study on Alginate–Chitosan Complex Formed with Different Polymers Ratio

机译：不同聚合物比例形成藻酸盐-壳聚糖复合物的研究

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Biomaterials based on polyelectrolyte complexation are an innovative concept of coatings and packaging production to be applied in a wide range of food products. The aim of this study was to obtain and characterize a sodium alginate–chitosan complex material with variable degree of polyion interactions by complexation of oppositely charged polysaccharides. In order to characterize polyelectrolyte complexes, theromogravimetric analysis (TGA), dynamic mechanical thermal analysis (DMTA), nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FT-IR), matrix-assisted laser desorption/ionization technique with time of flight analyzer (MALDI-TOF), and scanning electron microscopy (SEM) were performed. TGA analysis showed that thermal decomposition temperature depends on the polymer ratio ( R ) and thermal resistance of samples was improved by increasing chitosan dosage. Accordingly to DMTA results, polyelectrolyte complexation led to obtain more flexible and resistant to mechanical deformation materials. Comparative analysis of the FTIR spectra of single polyelectrolytes, chitosan and alginate, and their mixtures indicated the formation of the polyelectrolyte complex without addition of reinforcing substances. MALDI-TOF analysis confirms the creation of polyelectrolyte aggregates (~197 Da) in samples with R ≥ 0.8; and their chemical stability and safety were proven by NMR analysis. The higher R the greater the number of polyanion–polycation aggregates seen in SEM as film morphology roughness.
机译：基于聚电解质络合的生物材料是涂料和包装生产的创新概念，可广泛应用于各种食品中。这项研究的目的是通过带相反电荷的多糖的络合获得并表征具有可变程度的聚离子相互作用的藻酸钠-壳聚糖复合物。为了表征聚电解质配合物，热重分析（TGA），动态机械热分析（DMTA），核磁共振（NMR），傅立叶变换红外光谱（FT-IR），具有飞行时间的基质辅助激光解吸/电离技术分析仪（MALDI-TOF）和扫描电子显微镜（SEM）进行。 TGA分析表明，热分解温度取决于聚合物比（R），并且通过增加壳聚糖的用量可以提高样品的耐热性。根据DMTA的结果，聚电解质络合导致获得更柔韧性和抗机械变形的材料。对单个聚电解质，壳聚糖和藻酸盐及其混合物的FTIR光谱进行比较分析，表明不添加增强物质即可形成聚电解质复合物。 MALDI-TOF分析证实了R≥0.8的样品中聚电解质聚集体（〜197 Da）的形成; NMR分析证明了其化学稳定性和安全性。 R越高，在SEM中看到的薄膜形态粗糙度越大，聚阴离子-聚阳离子聚集体的数量越多。

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