Dataset for stable carbon isotope analysis of commercial vegetable oils in Brazil

This dataset contains stable carbon isotope composition (δ¹³C) data used in the study “Stable carbon isotope analysis for adulteration screening of commercial vegetable oils in Brazil”. The dataset includes anonymized commercial samples of refined maize, sunflower, soybean, and canola oils collected in Brazil, controlled C3:C4 mixtures prepared with sunflower and maize oils, and repeatability data from replicate EA-IRMS analyses. Commercial brands and manufacturers were anonymized to preserve confidentiality. Carbon isotope values are reported in milliurey (mUr).