Cold-Pressed Walnut-Oil Adulteration with Edible Oils Detection Using Vis-NIR Spectroscopy.

ABSTRACT: The aim of this study is to evaluate the usefulness of UV-Vis-NIR spectroscopy as a tool for detecting the adulteration of cold-pressed walnut oil and other edible oils (rapeseed, sunflower, and soybean oils) at varying percentages. The spectra were recorded between 200 and 1800 nm, but the analyses focused on 350-1650 nm due to high UV and NIR absorption. Color was determined in CIEL*a*b* coordinates to achieve the differences among the samples. The spectra were submitted to several pre-treatment (none, normalization, SNV, MSC, baseline/detrend, first/second derivative, and 1st-order smoothing) to improve the statistical model's parameters. The differentiation of the samples was carried out using an unsupervised method (principal component analysis-PCA) and two supervised methods (linear

SUBMITTER: Fediuc G 

PROVIDER: S-EPMC12651916 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature