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Antioxidative capacity of birch saps

Bilek M., Siembida A., Gostkowski M., Stawarczyk K., Cieślik E.

Biotechnology and Food Science

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2017

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Vol. 81, nr 1

3--10

EN

In our subsequent studies of birch tree saps we focused on assessing their antioxidant capacity. For research we chose four groups of silver birch trees (Betula pendula Roth.), consisting of five individuals. Antioxidant capacity was examined using spectrophotometric technique. The highest antioxidant capacity, tested by the Folin-Ciocalteau method and expressed as a total phenolics content was 6.59 mg GAE/100 ml of tree sap, and in turn the lowest one 0.88 mg GAE/100 ml. The highest antioxidant capacity determined ABTS method and expressed as radical scavenging activity (RSA) was 30.9% and lowest 5.38% The average values of antioxidant capacity both expressed as a phenolic compounds content and as radical scavenging activity for tree saps collected from four particular locations did not differ significantly. Based on the obtained results of tree sap analyses, it can be claimed that compared to other food products, e.g. fruit and vegetable juices, birch saps are not a rich source of phenolic compounds and when compared e.g. to tee infusions, they have low antioxidant capacity. Although it can be increased by the introduction of functional additives, such as herbal extracts or concentrated fruit juices.

2

Zawartość kadmu w sokach wybranych gatunków drzew

Bilek M., Stawarczyk K., Gostkowski M., Cieślik E.

Polish Journal for Sustainable Development

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2016

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T. 20

15--20

PL

Soki drzewne pobierane są od wieków w celu uzyskania efektu odżywczego i leczniczego. Współczesne badania potwierdzają zasadność ludowych zastosowań soków drzewnych, głownie ze względu na wysokie stężenia pierwiastków metalicznych, klasyfikowanych jako składniki mineralne. Powstaje jednak pytanie, czy wraz z ich wysoką zawartością w sokach drzewnych nie występują równocześnie jony metali ciężkich. W niniejszych badaniach oszacowano zawartość kadmu w sokach ośmiu gatunków drzew. Odnotowane zawartości nie przekroczyły dopuszczalnych norm, biorąc jednak pod uwagę, że pobór prowadzono na terenach czystych ekologicznie, uzyskane wyniki wskazywać mogą na potencjalne zagrożenia konsumentów pozyskujących i spożywających soki drzewne ze stanowisk eksponowanych na zanieczyszczenia związane z działalnością przemysłową i rolniczą.

EN

Tree saps have been collected for centuries to obtain nutritional and medicinal benefits. Contemporary researches are confirming the validity of folk customs applications of tree saps, mainly due to high concentrations of metallic elements, classified as minerals. But the question arises, whether with their high content in tree saps, at the same time, there are also heavy metals. In the present study, the cadmium content in the saps of eight species of trees has been estimated. The reported content did not exceed the permissible standards. However, taking into account that the tree saps were collected from the environmentally clean area, the obtained results may indicate the potential risk to consumers receiving and consuming saps from positions exposed to industrial and agricultural pollutions.

3

The usefulness of birch saps from the area of Podkarpacie to produce birch syrup

Bilek M., Olszewski M., Gostkowski M., Cieślik E.

Biotechnology and Food Science

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2016

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Vol. 80, nr 1

11--18

EN

In northern European countries, as well as in North America tree saps of maples and birches are used for the production of syrups. Birch syrups are characterized by a specific aromatic taste and can be used as an addition to sweets, desserts, salads and meats. Attention is paid to the health benefits of birch syrups, mainly for high mineral content. The aim of this study was to evaluate the usefulness of birch saps obtained from the area of Podkarpacie for birch syrup production. HPLC-ELSD system was used for analysing the sugar content in the birch tree saps from four localization. All the examined saps contained the monosaccharides as fructose and glucose. The presence of sucrose was found in eight per twenty tested saps. There weren’t statistical differences between the studied sites for the averages of total sugar concentration in the tree saps samples. The highest average amount of total sugar was found in the D sites (11.74 g/dm3), whereas the lowest in the C sites (7.66 g/dm3). Silver birch tree saps from the area of Podkarpacie offer perspectives to used for syrup production according to the US and Finnish criteria of profitability.

4

Productivity paradox in polish food production industry

Jałowiecki P., Gostkowski M.

Information Systems in Management

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2013

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Vol. 2, No. 4

263--273

EN

This paper presents the results of studies of the relationship between level of advancement of IT solutions used in Polish enterprises of food processing and the company's financial situation, logistic costs, position on the market against the sector, and quality of IT support of logistics. The results showed no significant correlation between IT solutions advancement level and financial situation, and logistic costs. These results corresponds with the productivity paradox signaled in the literature. However, there was an average correlations between the IT solutions advancement level and position on the market against the sector, and quality of IT support of logistics. The studies used the results of a survey conducted in 2009-2011 among Polish food processing sector enterprises.