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The aim of this research work was the observation of changes in the qualitative and quantitative parameters of five cultivars of edible potatoes: Agria, Impala, Picasso, Raja, Santé. Samples were stored under regulated conditions in the storage room of the farm Agropartner Plavecké Podhradie, in the branch of Sološnica, Slovakia. Samples were taken three times during the tuber storage. The following parameters were investigated during three years observations: content of dry matter, starch content, total sugars, reducing sugars, nitrates and the content of vitamin C. Considering the dry matter content as the basic stabilizing component, the cv. Santé is the most appropriate for storage. Starch level was the highest in cvs Raja and lowest in Impala. Taking sugar levels into consideration we recommend cv. Agria as the most appropriate and the most stable for storage. This cultivar is the most suitable for technological processing and manufacture of French fries and chips as well. Regarding the nitrate cumulation, all cultivars may be considered to be safe, the determined levels of nitrates were low. The values of vitamin C were lower as compared to the potential levels of this component in edible potatoes. The highest level was in the cv. Agria. This parameter also showed the least fluctuations.
In purpose to examine the antioxidant activity of 15 natural honeys of different origin ABTS method was used, total phenol content and dry matter content of honey samples were determined. Honeys were collected from different locations of Slovakia, Poland and Serbia and were represented as monofl oral and multifl oral samples (10) which originated from Poland and Slovakia, forest samples (4) originated from Serbia and honeydew honey. Average values of antioxidant activity observed in samples of honeys ranged from 0.62 to 4.63 mmol/kg. The highest antioxidant activity was detected in buckwheat honey and the lowest was shown in acacia honey. By observing the impact of individual honey samples on antioxidant activity it was found that the sample had a highly statistically signifi cant effect. 10 homogeneous groups which varied in the antioxidant activity among each other were established by all 15 samples. Antioxidant activity of honeys could be a positive infl uence factor in terms of honey differentiation, especially in the case of the forest honeys collected from different places. Monofl oral and multifl oral honeys (10) established 5 homogenous groups, but in the case of several multifl oral honeys which originated from different places of Poland and Slovakia no statistically signifi cant differences were found.
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