Phenolic Composition and Antioxidant Properties of 2 Taxa of Macadamia Flowers

Abstract

This study investigated the differences in phenolic composition and antioxidant properties among 4 extracts (eg,70% acetone, 70% methanol, 70% ethanol, and water) of 2 taxa of Macadamia flowers (“Nanya No.2” and “HAES695” cultivars). The results showed that the phenolic compounds and antioxidant properties of the extracts were taxa- and solvent-dependent. “Nanya No.2” flowers possessed remarkably more phenolics and flavonoids, with more robust antioxidant activities than “HAES695”. The 70% acetone extract exhibited the highest polyphenol levels and antioxidant capacities, indicating that 70% acetone would be the most efficient solvent for extracting phenolic antioxidants from macadamia flowers. The high-performance liquid chromatography (HPLC) analysis revealed rutin and catechin as the richest compounds in the extracts of both cultivars. Ferulic acid, catechin, phlorizin, quercetin, and kaempferol positively correlated with the antioxidant properties of the macadamia flowers. These results provide valuable information for utilizing macadamia flowers in antioxidant foods.

Total phenolic, flavonoid contents, and antioxidant activity of three selected Portulaca grandiflora mutants in MV8 generation as a result of recurrent irradiation technique

“…Hallman [36] studied the polyphenol content in pink and white Robinia flowers and found that pink flowers contain more phytochemicals than white flowers. Another study conducted by Yang and Lu [37] revealed that white petal Macadamia flowers contain higher polyphenols and antioxidants than pink petal flowers. These unique phenomena occur based on the availability of different active secondary metabolites in each species.…”

Nutritional composition of Sacha inchi (Plukenetia volubilis) according to cooking method and its application as an elder‐friendly drink

“…In biochemistry, 2,2 0 -azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) is a compound used to simply quantify the amount of hydrogen peroxide in a sample. Using this compound, ABTS radical scavenging activity analysis was performed according to the method reported by Yang & Lu (2022). The ABTS radical cation (ABTS •+ ) solution was prepared by mixing 7 mmol/L of ABTS and 2.45 mmol/L of potassium persulfate and incubating it at room temperature for 16 h in the dark.…”