In this study, we report a rapid statistical approach used in determining the caprolactam (CPL) content in curdlan packaging films, which is based on the spectral data observed in the near-infrared (NIR) and Mid-infrared (MIR) regions. At the first stage of the study, the CPL content was added into the curdlan films prepared by controlling the concentration, and then the effect of the CPL concentration on the measured mechanical properties of the produced films were evaluated. At the next stage, the NIR and MIR spectra of the curdlan films with different CPL concentrations were recorded by using the FT-NIR and FT-IR spectroscopy technique, and the spectral data to be used in the regression models in our quantitative analyses were carefully selected. It was observed that the curdlan film with 5% CPL exhibited the best mechanical properties. The obtained best correlation parameters which are used in evaluation of CPL content through the observed NIR and MIR spectral data are Rp = 0.9552, RMSEP = 1.2506 (NIR); Rp = 0.9092 and RMSEP = 1.9136 (MIR), respectively. These optimal values support the expectation that our statistical approach based on NIR and MIR data can provide a rapid, accurate and nondestructive way of determining CPL content in curdlan packaging films.

在这项研究中，我们报告了一种快速统计方法，用于确定柯德兰包装薄膜中的己内酰胺（CPL）含量，该方法基于在近红外（NIR）和中红外（MIR）区域中观察到的光谱数据。在研究的第一阶段，将CPL含量添加到通过控制浓度制备的柯德兰膜中，然后评估CPL浓度对所生产膜的机械性能的影响。在下一阶段，使用FT-NIR和FT-IR光谱技术记录了具有不同CPL浓度的curdlan膜的NIR和MIR光谱，并仔细分析了定量模型中用于回归模型的光谱数据已选择。观察到具有5％CPL的凝胶多糖膜表现出最佳的机械性能。通过观测的NIR和MIR光谱数据获得的用于评估CPL含量的最佳相关参数为Rp = 0.9552，RMSEP = 1.2506（NIR）；Rp = 0.9092和RMSEP = 1.9136（MIR）。这些最佳值支持以下期望：我们基于NIR和MIR数据的统计方法可以提供一种快速，准确且无损的方法来测定凝胶多糖包装薄膜中的CPL含量。