Determination of ochratoxin A in Vitis labrusca musts: analytical performance and occurrence in Southern Brazil.

≥ 0.999), satisfactory recoveries (83.75-104.6%), and limits of detection and quantification of 0.02 and 0.07 µg/L, respectively, in agreement with the Brazilian regulations. Only trace OTA peaks were detected, with no association observed between mycotoxin occurrence and grape cultivar or physicochemical maturity parameters. Overall, the proposed sample preparation proved suitable for routine monitoring at the pre-fermentation stage, supporting the safety and quality assessment of grape-derived products.