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The effect of storage of bee pollen extracts on polyphenol content

100%

Rzepecka-Stojko A. , Stec M. , Kurzeja E. , Gawronska E. , Pawlowska-Goral K.

Polish Journal of Environmental Studies

2012

tom 21

nr 4

Bee pollen belongs to bee products that are characterized by high nutritional value and biotic activity. These characteristics result from the wide variety of compounds that bee pollen contains. Our study determined the effects of storage conditions of bee pollen extracts on polyphenol content. The study was conducted with the use of three types of bee pollen extracts, namely ethanol extracts, enzymatic hydrolysates from pollen, and ethanol extract of pepsin-digested bee pollen. Polyphenol content in the studied extracts was determined immediately after extraction and after 12-month storage. We have concluded that 12- month storage of bee pollen extracts decreases polyphenol concentration in all three types of extracts, and the changes depend on the storage conditions.

Effect of storage conditions on antioxidant activity of bee pollen extracts

100%

Rzepecka-Stojko A. , Drzal A. , Stojko J. , Buszman E.

Medycyna Weterynaryjna

2014

tom 70

nr 12

Bee pollen is a product of rich and varied chemical composition, and its biological activities are diverse. Many of these activities are related to the antioxidant effect of bee pollen. The aim of this study was to determine the effect of storage conditions on the antioxidant activity of bee pollen extracts. The study was conducted on three types of bee pollen extracts, namely, ethanol and pepsin extracts of bee pollen, as well as on ethanol extracts of pepsin-digested bee pollen. Antioxidant activity was determined by a DPPH method, directly after obtaining the extracts and after storing them for twelve months under various conditions, i.e. at –18°C in the dark, at 4-8°C in the dark, at room temperature in the dark, and at room temperature in the light. It was concluded that the 12-month storage of bee pollen extracts caused a decrease in the antioxidant activity of all extracts examined, and the decrease depended on storage conditions. The highest decrease in antioxidant activity was observed in all types of extracts stored at room temperature in the light. The lowest decrease in antioxidant activity was found in ethanol extracts of pepsin-digested bee pollen.

Antioxidative properties of bee pollen extracts examined by EPR spectroscopy

84%

Rzepecka-Stojko A. , Pilawa B. , Ramos P. , Stojko J.

Journal of Apicultural Science

2012

tom 56

nr 1

The effect of the pollen extracts Quercitin and Cernitin on the liver, lungs, and stomach of rats intoxicated with ammonium fluoride

67%

Humiczewska M. , Hermach U. , Put A.

Folia Biologica

1994

tom 42

nr 3-4