Methanolic extracts of powder samples were prepared with the aim to characterize phenolics that contributed to the functionality of spray-dried powders. Approximately 1 g of powder sample was extracted with 10 mL of 80% methanol containing 0.1% HCl (acidified methanol) for 1 h. After that, samples were centrifuged at 3000× g, for 10 min, and collected supernatants were immediately analysed using a Dionex Ultimate 3000 UHPLC system equipped with a diode array detector (DAD) and TSQ Quantum Access Max triple-quadrupole mass spectrometer (Thermo Fisher Scientific, Basel, Switzerland), as previously reported by Pešić et al. [8]. Phenolics from the samples were quantified by direct comparison with commercially available standards (purchased of Sigma-Aldrich, Taufkirchen, Germany), using Xcalibur software (version 2.2.), and expressed as mg/g of spray-dried powder. A list of quantified phenolic compounds together with their equation parameters, limits of detection (LOD), limits of quantification (LOQ), correlation coefficient (r2) and linearity ranges are given in Table S1.

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