Effect of heat treatment for liquefaction and pasteurization on antioxidant activity and phenolic compounds of Astragalus and sunflower-cornflower honeys

Abstract

On this study, effect of heat treatments (liquefaction at 55 °C for 12 h and pasteurisation at 90 °C 15 sec) on total phenolic content, antioxidant activity and phenolic compounds of astragalus and sunflower-cornflower honeys was investigated. Total phenol content and antioxidant activity of honeys were assessed by Folin-Ciocalteu and ABTS methods, respectively. Phenolic profile was determined by HPLC-DAD system. Dnly pasteurisation process had a significant impact on sunflower-cornflower honey with regard to total phenolic content and antioxidant activity. Protocatechuic, 4-hydroxybenzoic, caffeic, p-coumaric, and ferulic acids, rutin, kaempferol were detected in astragalus honey, while 2,5-dihydroxybenzoic, chlorogenic, caffeic, p-coumaric, and ferulic acids, apigenin, rutin, kaempferol-3-glucoside, isorhamnetin-3-glucoside, quercetin, luteolin, kaempferol were detected in sunflower-cornflower honey. Pasteurisation significantly decreased caffeic acid in astragalus honey and other detected phenolics showed no significant difference after heat treatments. The impact of liquefaction process is lower than the pasteurisation process in terms of quantitatively phenolic compounds changes. Practical application:This study provides useful information for determining the appropriate method which will have the least effect on the components of honey, from different heat treatments applied to flower honey for crystallization prevention and pasteurization.

Heat Treatment Improves UV Photoprotective Effects of Licorice in Human Dermal Fibroblasts

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Comparative studies on the structure, biological activity and molecular mechanisms of polysaccharides from Boletus aereus (BA-T) and Pleurotus cornucopiae (PC-1)

“…Boletus aereus and Pleurotus cornucopiae are two kinds of rare edible and medicinal fungus with high medicinal value . In recent years, studies have shown that polysaccharide from Boletus aereus and Pleurotus cornucopiae have some interesting biological activities, such as bacteriostasis, antioxidation, et al (Hagiwara et al, 2005;Wang et al, 2013;Wu et al, 2014;Minato et al, 2017;Lee et al, 2017;Zhang et al, 2014). However, there are some differences in the structure of polysaccharides from different regions, and there is no report on the study of the polysaccharides of Boletus aereus and Pleurotus cornucopiae from Litang county of Sichuan Province.…”