Georgi Angelov
Agricultural Academy, Institute of Cryobiology and Food Technologies, Cheni Vrah 53 blvd., Sofia, Bulgaria
Angelov, G. (2026). Study of the content of total phenols and antioxidants in Bulgarian grape varieties after freeze-drying. Bulg. J. Agric. Sci., 32(2), 401–410
The study aims to investigate the physicochemical parameters as well as the antioxidant activity and the total amount of phenols of different grape varieties, selected on the territory of the Institute of Viticulture and Enology – Pleven at the Agricultural Academy, located in the Central Danube Plain, Bulgaria. Three different grape varieties were presented: a local variety Gamza, an introduced – Cabernet Sauvignon, and a hybrid – Kailashki Rubin (Pamid x Hybrid IV-2-15 x Gamay Noir x Vitis amurensis). The study investigated parameters such as pH, moisture content, color characteristics, antioxidant activity and total phenolic number of fresh and freeze-dried grapes of the three varieties, and a comparative characteristic between the two types of processing was made. After the conducted studies, it was found that fresh and freeze-dried grapes retain approximately the same results of the physicochemical parameters.