title: Effect of freezing and room temperatures storage for 18 months on quality of raw rapeseed honey (Brassica napus).
abstract: The physicochemical properties, colour characteristics and dynamic viscosity of fresh rapeseed honey (control, CON) and those stored for 18 months at room temperature (RT) or in freezer (FRO) were compared. The significant decrease of pH after storage was found. Honey stored at RT showed an increase of 5-hydroxymethylfurfural (HMF) (+543.0 %) and decrease of diastase activity (-24.4 %), while in FRO samples the decreasing course (-50.5 and -7.3 %,p> 0.05) were found in comparison with CON samples (3.07 and 28.37 mg kg-1). The negative correlation between HMF content and diastase activity was found. The temperature of storage significantly influenced colour parameters, however, RT differentiated colour of honey to a greater extent (ΔE = 20.37) than FRO (ΔE = 8.07). The lightness (L*), hue (h°), whiteness index (WI) and colour intensity (ABS450) of CON honey samples were similar to honey from FRO. The dynamic viscosity was significantly higher in honey stored in FRO in comparison to CON honey and honey stored at RT. However, in comparison with CON honey, higher (almost twice) viscosity for honey stored at RT was observed.
authors: Laboratory of Instrumental Analysis of Food, University of Life Sciences in Lublin, Akademicka 13, 20-950 Lublin, Poland.
authors: Monika
authors: M
authors: Kędzierska-Matysek
authors: Laboratory of Instrumental Analysis of Food, University of Life Sciences in Lublin, Akademicka 13, 20-950 Lublin, Poland.
authors: Mariusz
authors: 0000-0003-0941-1714
authors: M
authors: Florek
authors: Department of Commodity Science and Processing of Raw Animal Materials, University of Life Sciences in Lublin, Akademicka 13, 20-950 Lublin, Poland.
authors: Anna
authors: A
authors: Wolanciuk
authors: Department of Commodity Science and Processing of Raw Animal Materials, University of Life Sciences in Lublin, Akademicka 13, 20-950 Lublin, Poland.
authors: Piotr
authors: P
authors: Skałecki
keywords: Colour; Diastase activity; Honey; Hydroxymethylfurfural; Storage conditions; Viscosity