METROLOGICAL LIMITS OF ACCURACY OF PUMPKIN SEED OIL ADDITION TO FUNCTIONAL DRINKS

Abstract

This article examines the metrological aspects of determining the accuracy limits for adding pumpkin seed oil to functional beverages. The focus is on the reproducibility and reliability of measurements when dosing biologically active components (tocopherols, carotenoids, and polyphenols) in emulsified systems. Experiments were conducted using standard analytical methods - spectrophotometry, HPLC, and titrimetry - to assess errors at the preparation, storage, and measurement stages. It was found that at a pumpkin seed oil concentration of 2-4%, the relative standard uncertainty of measurements is 2.1-3.4%, which meets the requirements of ISO/IEC 17025. Above 5%, nonlinear emulsification effects are observed, increasing the error to 6.8%. A metrological scheme was developed, including equipment calibration, sample stability control, and the use of certified reference materials. The data obtained make it possible to determine the optimal accuracy limits for dosing pumpkin seed oil in the production of functional beverages.