.4.2. Mild-temperature-drying procedure
This procedure is a modification of the method done by Bozan et al. (1998). About 100 g of dog rose samples in each maturity stage were separately weighed and dried under mild temperature (15–20 °C) and ground to find powder dust before extraction. Then obtained powder were weighed (1.0 g for orange, 1.0 g for fully ripe, 2.0 g half-ripe, and 2.5 g for unripe dog rose sample) and subsequently extracted with 25 mL of extractant solution, containing 5% MPA, at 10 °C and in the dark. Extraction process was performed using a shaker for 4 h. All extractions were carried out in triplicate and obtained solutions were then filtered and stored at 4 °C before analysis. The injection of the extracts into HPLC system was performed twice.