Influence of altitudinal variation on the total phenolic and flavonoid content of Acacia and Ziziphus honey

Abstract

ABSTRACT Polyphenols are recognized as significant phytochemicals responsible for the health-promoting properties of honey. Their levels and chemical diversity in honey are mainly dependent on the floral and geographical origin of the honey. In this study, we investigated the influence of altitudinal variation on the total phenolic content (TPC) and total flavonoid content (TFC) of Acacia and Ziziphus honey collected from the Asir region of Saudi Arabia. Samples were collected at four altitudes (113, 317, 511, and 576 meters above sea level). The monofloral origin of the honey was confirmed and characterized by melisopalynological analysis. The Folin–Ciocalteu and aluminum chloride methods were applied for the determination of TPC and TFC, respectively. Results showed that the TPC and TFC values were significantly different between Acacia and Ziziphus honey collected at the same altitudes, and both types exhibited high levels of phenolic compounds. There was a significant positive correlation between altitude and both TPC and TFC in Acacia honey. In contrast, a significant negative correlation was found between altitude and both TPC and TFC in Ziziphus honey. We concluded that altitude significantly influenced the TPC and TFC of honey and that the effects may differ based on floral origin. Further investigation is required to develop a deeper understanding of the relationship between altitude and the content of polyphenols in honey.