*2.2. Byproduct Materials*

The following types of byproducts were considered: sea buckthorn flour, hemp flour, walnut flour, grape seed flour, rapeseed meals, sunflower meals, black sesame meals, red grape seed meals, golden flax meals, thistle meals, sesame groats, thistle groats, coriander groats, sunflower groats. The byproducts were obtained from the vegetable oil industry and provided by the Association of Operators in Organic Farming Bio-Romania (Romania). The samples were ground using a laboratory mill and kept in closed jars in a refrigerator at 4 ◦C.

### *2.3. Qualitative Analysis by ATR-FTIR*

The FTIR spectrum for byproducts and dry extracts was recorded at room temperature using the Cary 630 FTIR Spectrometer in ATR mode (Agilent Technologies Inc., Santa Clara, CA, USA). The chosen measurement range was 4000–650 cm<sup>−</sup>1, number of scans 400, resolution 4 cm<sup>−</sup>1. The FTIR spectra of dry extract were produced on the alcoholic extract of byproducts dried previously in an oven at 25 ◦C (for 24 h) [24].
