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The influence of selected process factors on the physicochemical and biological properties of honeys: A review

Kowalska Gabriela, Rosicka-Kaczmarek Justyna, Olejnik Tomasz P., Dędek Kamil

Biotechnology and Food Science

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2019

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Vol. 83, nr 1

57--69

EN

Honey is one of the world's most valued natural food products. Characteristic, pleasant aroma, golden colour, sweet taste and healthpromoting properties cause a continuous increase of honey consumption in the European Union. The most wanted is regional honey. However, imported honey available on the market has often lower prices. The honey obtained can be heat treated, which reduces water content and can slow down the growth of the microorganisms, which are responsible for the undesirable fermentation of honey. Unprocessed honey appears to be the healthiest, but in practice, it’s often heat treated to slow down or back up the crystallization process and to make its dosage during technical processes easier. It is widely believed that heating of honey may have a harmful impact on its properties. There are countless articles of popular science, that warn of heating and cooking with honey. Should honey never be heated? The aim of this work is to give an overview of the influence of technical processes on the physicochemical and health-promoting properties of honey. The results demonstrated that the physicochemical and bioactive properties of honey are significantly affected by thermal treatment. As a result of the temperature, it comes to the Maillard reaction, during which HMF is synthesized. Furthermore, heating affects the activity of the enzymes contained in honey, among others, diastase and inverses. However, few studies made in this field show that honey heat treatment may work in favour of antioxidant properties. Depending on the type of honey, melanoidins may increase or decrease the antioxidant activity.

2

5-hydroxymethylfurfural content in selected gluten- and gluten-free cereal food products

Mańkowska D., Majak I., Bartos A., Słowianek M., Łącka A., Leszczyńska J.

Biotechnology and Food Science

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2017

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Vol. 81, nr 1

11--21

EN

5-Hydroxymethylfurfural (HMF) was determined with HPLC method in forty one food samples, including gluten-free, breakfast cereals and bakery products. The highest concentration of HMF was found in wheat bread with cranberries (210 mg kg-1) and in breakfast cereals – honey wheat loops (85.099 mg kg-1). In contrast, wholegrain oatmeal and gluten-free sponge cakes had the lowest HMF level of all tested samples, below the detection limit and 0.485 mg kg-1, respectively. In most cases, lack of gluten coincided with the lowest HMF content readings (average 8.488 mg kg-1). The impact of the type of sugar, especially glucose, on the HMF concentration in food is apparent. Sweetened breakfast cereals, with the average content of HMF at 25.55 mg kg-1, took lead over dietary products (8.488 mg kg-1) and bakery products (18.395 mg kg-1), with the exception for wheat bread with cranberries. These cereals contained glucose or glucose-fructose syrup.

3

Identyfikacja zmian zachodzących w miodzie skrystalizowanym pod wpływem obróbki mechanicznej

Bakier S.

Inżynieria i Aparatura Chemiczna

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2008

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Nr 6

55-57

PL

W pracy przedstawiono wyniki zmian zachodzących w trzech wybranych miodach skrystalizowanych pod wpływem obróbki mechanicznej. Identyfikowano efekt reodestrukcyjny i zmiany parametrów fizykochemicznych miodu: liczby diastazowej i zawartości HMF-u. Stwierdzono, że warunkiem modyfikacji konsystencji jest ścinanie miodu skrystalizowanego z γ> 150s-1. Obróbka mechaniczna nie wpływa na LD i HMF.

EN

The changes of energy consumption during disintegration process of lupine seeds are presented. The study was conducted for six varieties of lupine seeds. The temperature and moisture content changes during disintegration process were recorded. According to the results a correlation between moisture content and energy consumption of disintegration process of one tone of lupine seeds was found. It was described by the equation in a form of polynomial of the third degree.