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Effect of Liquefaction of Honey on the Content of Phenolic Compounds
Authors: Hájek Tomáš
Year: 2023
Type of publication: článek v odborném periodiku
Name of source: Molecules
Publisher name: MDPI
Place: BASEL
Page from-to: 714
Titles:
Language Name Abstract Keywords
cze Vliv zkapalňování medu na obsah fenolických sloučenin Zkapalňování medu při nízké teplotě je časově velmi náročné a pro urychlení procesu rozpouštění krystalů cukru lze použít mikrovlny nebo ultrazvukovou lázeň. V této práci bylo studováno, jak byl obsah fenolických kyselin a flavonů v medu ovlivněn zkapalňováním medu pomocí mikrovlnného ohřevu. Koncentrace testovaných látek v neupraveném medu a v medu zkapalněném v horké vodní lázni, ultrazvukové lázni a mikrovlnné troubě při čtyřech úrovních mikrovlnného výkonu byly stanoveny kapalinovou chromatografií na reverzní fázi v kombinaci s vícekanálovou elektrochemickou detekcí. fenolické látky; flavonoidy; antioxidanty; med; kapalinová chromatografie; coulometrická detekce; mikrovlny
eng Effect of Liquefaction of Honey on the Content of Phenolic Compounds Thermal liquefaction at low temperature is very time consuming and microwaves or an ultrasonic bath can be used to accelerate the process of dissolving sugar crystals. Phenolic compounds, such as phenolic acids or flavonoids, are an important group of secondary metabolites of plants and become honey from the nectar of blossoms. In this study, how the content of phenolic acids and flavones in honey were affected by liquefaction of honey using a microwave oven was studied. The concentration of tested compounds in untreated honey and in honey liquefied in a hot water bath, ultrasonic bath and microwave oven at four microwave power levels were determined by reversed phase liquid chromatography combined with multichannel electrochemical detection. A significant decrease in the content of all compounds was observed for all melting treatments. The phenolic compounds concentration decreased on average by 31.1-35.5% using microwave at intensities 270, 450 and 900 W and the time required for the sugar crystal melting was more than 20 times less than in the case of the 80 degrees C water bath. The temperature of samples after the end of microwave liquefaction was 76-89 degrees C. Significantly higher losses of phenolic compounds were observed during ultrasound treatment (48.5%), although the maximum temperature of honey was 45 degrees C, and at the lowest microwaves power (50.6%). phenolic compounds; flavonoids; antioxidants; honey; liquid chromatography; coulometric detection; microwave

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