2.5. Raman Spectra Analysis

Spectra of grape pomace extracts were recorded using an i-Raman spectrometer (EZM-A2-785L, B&W TEK Inc., Newark, DE, USA) equipped with a fiber-optic Raman probe; the spectrum was recorded from 2600 − 175 cm⁻¹. Samples were scanned at an increment of 10 nm. Integration time was 15 s. In order to display the spectra of the extract, Spekwin32-optical spectroscopy software (Version 1.72.2, 2016, http://www.effemm2.de/spekwin/) was used.