Effects of crystallization on antioxidant property of honey

Abstract

Duran Ozkok, Sibel Silici

ABSTRACTMelissopalynological and biochemical analyses of 50 honey samples (chestnut, citrus, clover, cotton, and sunflower) were performed in this study. The total phenolic contents (TPC) with the Folin–Ciocalteu, antioxidant activities with the phosphomolybdenum, and free radical scavenging activities with the 2,2-diphenyl-1-picrylhydrazyl methods of honey samples were determined. The fructose (F) content of honey samples varied between 31.44% and 35.16%, glucose (G) contents between 22.46% and 32.71%, and sucrose contents between 0.37% and 1.94%. Moreover, the G + F contents of clover, citrus, sunflower, chestnut, and cotton honey were respectively observed as 67.87%, 66.21%, 67.39%, 53.90%, and 66.26%. The F/G ratios of the honey samples varied between 1.07 and 1.40 and the glucose/water (G/W) ratios between 1.36 and 1.94. Furthermore, biological analyses performed in every 6 months throughout the 18 months of storage revealed decreasing TPCs, antioxidant, and antiradical activities over time in the honey samples (p < 0.05). However, such decreases were attributed to the negative impacts of storage on honey rather than crystallization.