Cellulose nanofibrils (CNF) isolated from the external sheaths of palm peach (Bactris gasipaes) were evaluated as improvers of several characteristics of cassava starch films. The cellulosic material of 10 to 30 nm diameter was produced by mechanic defibrillation. All films were characterized by scanning electron microscopy, thermal analysis, water vapor permeability (WVP), Fourier transform infrared spectroscopy, physical characterizations (solubility, humidity, water activity, thickness, tensile strength and elongation) and optical analysis. The incorporation of CNF as reinforcement caused changes in all properties analyzed, thus differing from the control film (without cellulosic reinforcement). Physical reinforcement was the main effect observed in films containing CNF, according to the mechanical resistance and permeability analyses. Furthermore, such analyses confirmed the increase in tensile strength in 306% and reduction in 26% of WVP for films containing 5.37% nanofibrils, when compared to the control. Higher opacity was verified as more CNF was added to the filmogenic matrix, as a result of the dispersion of light by nano-sized fibrils. No variations in the thermal profiles occurred in films containing CNF or not. Spectroscopic data revealed a possible crosslinking formation between starch and CNF, which can influence positively the tensile strength of such films.

中文翻译：

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桃棕榈农残中纤维素纳米原纤维在木薯淀粉膜中的应用

从棕榈桃（Bactris gasipaes）的外皮中分离出纤维素纳米原纤维（CNF））被评估为木薯淀粉薄膜几种特性的改进剂。通过机械除纤颤生产直径为10至30 nm的纤维素材料。所有薄膜均通过扫描电子显微镜，热分析，水蒸气渗透性（WVP），傅立叶变换红外光谱，物理特性（溶解度，湿度，水活度，厚度，拉伸强度和伸长率）和光学分析进行表征。掺入CNF作为增强剂会导致分析的所有特性发生变化，因此与对照膜（无纤维素增强剂）不同。根据机械阻力和磁导率分析，物理增强是在含有CNF的薄膜中观察到的主要作用。此外，这样的分析证实，与对照组相比，含5.37％纳米原纤维的薄膜的拉伸强度提高了306％，WVP降低了26％。由于更多的CNF被添加到成膜基质中，因此被证实具有更高的不透明性，这是由于纳米级原纤维分散了光。含有或不含CNF的膜的热分布没有变化。光谱数据表明，淀粉和CNF之间可能形成交联，从而可以积极影响此类薄膜的拉伸强度。