Hoffellner Lisa, Henögl Elias M, Petschacher Patrick, Schennach Robert, Leitner Erich
Institute of Analytical Chemistry and Food Chemistry, Graz University of Technology, Graz, Austria.
CD-Laboratory for Mass Transport Through Paper, Graz University of Technology, Graz, Austria.
Front Chem. 2021 Nov 19;9:769022. doi: 10.3389/fchem.2021.769022. eCollection 2021.
Paper is the material of choice for a large range of applications because it has many favorable environmental and economic characteristics. Especially in the packaging sector of dry goods and food products, paper has found unique applications. For that purpose, it has to fulfill certain requirements: Primarily it should protect the packaged goods. In order to ensure the compliance of a paper packaging, its interactions with the packaged goods should be investigated. Therefore, it is of utmost importance to understand how the paper interacts with chemicals of different nature and what factors influence these interactions-be that the nature of the paper or the characteristics of the substances. In this study, we investigated the surface interactions of cellulose thin films with n-decane and deuterated methanol using two different analytical methods: headspace solid-phase microextraction with gas chromatography and flame ionization detection (HS-SPME-GC/FID) and temperature-programmed desorption (TPD). Cellulose thin films were characterized with contact angle and FT-IR measurements and successfully applied as model systems for real paper samples. Regarding the interactions of the cellulose films with the model compounds, the two inherently different methods, HS-SPME-GC/FID and TPD, provide very comparable results. While the nonpolar n-decane was readily released from the cellulose films, the polar model compound deuterated methanol showed a strong interaction with the polar cellulose surface.
纸张因其具有许多良好的环境和经济特性，成为了众多应用的首选材料。特别是在干货和食品的包装领域，纸张有着独特的应用。为此，它必须满足某些要求：首先，它应保护包装内的物品。为确保纸质包装符合要求，需研究其与包装物品之间的相互作用。因此，了解纸张如何与不同性质的化学物质相互作用以及哪些因素会影响这些相互作用（无论是纸张的性质还是物质的特性）至关重要。在本研究中，我们使用两种不同的分析方法研究了纤维素薄膜与正癸烷和氘代甲醇之间的表面相互作用：顶空固相微萃取结合气相色谱和火焰离子化检测（HS-SPME-GC/FID）以及程序升温脱附（TPD）。通过接触角和傅里叶变换红外光谱（FT-IR）测量对纤维素薄膜进行了表征，并成功将其用作实际纸张样品的模型系统。关于纤维素薄膜与模型化合物的相互作用，HS-SPME-GC/FID和TPD这两种本质上不同的方法提供了非常可比的结果。非极性的正癸烷很容易从纤维素薄膜中释放出来，而极性模型化合物氘代甲醇与极性纤维素表面表现出强烈的相互作用。
