Comparison of antioxidant contents of Thai honeys to manuka honey
2016
Roongpet, T. | Anothai, T. | Chuleeporn, S. | Bundit, T. | Pattaramart, P.
Introduction: Natural honey has been valued in traditional medicine having demonstrated many antioxidant properties. The aim of this study was to compare the antioxidant activities of 12 types of honey from Thailand and manuka honey from New Zealand. Methods: Antioxidant contents of phenolic content, ferric reducing antioxidant power (FRAP), ascorbic acid content, 2, 2-diphenyl-1- picrylhydrazyl (DPPH), and Trolox Equivalent Antioxidant Capacity (TEAC) were determined in Thai and manuka honey samples. Results: All of the 12 types of Thai (n=54) and manuka (n=3) honey varied in range for phenolic content (210-1,519, 563-785 mg GAE/kg), FRAP value (600-9,183, 3,866-4,933 µM Fe(II)/ kg), ascorbic acid content (103-386, 913-1,212 mg/kg), DPPH radical scavenging activity (25-528, 259-310 mg Trolox/kg) and TEAC content (96-636, 328-421 mg Trolox/kg). Mangosteen honey had the highest content of phenolics (1,495±20 mg GAE/kg), FRAP value (9,083±100 µM Fe(II)/kg), DPPH radical scavenging activity (522±6 mg Trolox/kg) and TEAC content (632±3 mgTrolox/kg). Conclusion: Antioxidant activities in mangosteen and rambutan honey presented significantly higher values than manuka honey in terms of phenolic content, DPPH and TEAC. Manuka honey contained the highest vitamin C content (1,194±18 mg/ kg). However, the values for antioxidant properties were dependent on source of honey. Some honeys from Thailand were found to be a better source of antioxidant properties compared to manuka honey.
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