Composition Analysis and Antioxidant Activity of Blueberry Honey from Guizhou
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Abstract:
Taking the blueberry honey of Guizhou as the research object, its physicochemical indices, antioxidant activity, and polyphenol composition of blueberry honey of Guizhou were analyzed. The results showed that blueberry honey of Guizhou had an acid value of 44.69 mmol / kg, total sugar content of 79.30%, with its glucose content (40.88%) higher than its fructose content (38.41%). The total phenolic acid and total flavonoid contents were 20.27~24.72 mg GAE/100 g and 3.88~6.77 mg RE/100 g, respectively. The IC50 values for the DPPH free radical and ABTS free radical scavenging rates were 119.04~136.56 mg/mL and 140.56~212.34 mg/mL, respectively. The blueberry honey contains a total of 15 polyphenolic compounds (protocatechuic acid, p-hydroxybenzoic acid, vanillic acid, caffeic acid, p-coumaric acid, rutin, ferulic acid, myricetin, uteolin, morin, quercetin, apigenin, kaempferol, isorhamnetin, galangin). Quercetin had the highest content among flavonoids, with the content of individual phenolic acid decreasing in the order of p-hydroxybenzoic acid>p-coumaric acid>ferulic acid>caffeic acid>vanillic acid>protocatechuic acid. The research showed that blueberry honey had a relatively high acidity and tended to crystallize. The high quercetin content along with the changing pattern of phenolic acid content can be used as the reference indices for blueberry honey identification and detection.
