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Color Photostability Assessment of Ultrasound-Assisted Extracts From European Blueberry (Vaccinium Myrtillus L.) Obtained with The Use of Non-Toxic Solvents

Kopyciński Bartosz, Duda Alicja, Langer Ewa, Kamińska-Bach Grażyna

Drewno : prace naukowe, doniesienia, komunikaty

2024

Vol. 67, nr 213

art. no. 187625

In recent years, the search for environmentally friendly industrial solutions has been gaining momentum, especially in the areas of materials science and food technology. The aim of this study was to evaluate the color photostability of European blueberry (Vaccinium myrtillus L.) extracts obtained with the use of non-toxic solvents. Extracts of lyophilized forest berries were prepared with the use of water, ethanol, glycerin, and their mixtures by means of ultrasound-assisted extraction. ATR-FTIR spectroscopy was used to determine chemical structure. Color measurement in the CIELab color space was performed before, during and after the QUV accelerated weathering test conducted for dyed cotton substrates. The content of anthocyanins expressed as cyanidin 3-glucoside equivalents was determined based on UV-Vis absorbance intensity measurement and a pHdifferential method. The highest color photostability was observed for the extract prepared using water and ethanol in the proportion 50/50 (v/v). However, the highest content of anthocyanins was recorded for the mixture of glycerin and ethanol in a ratio of 50/50 (v/v). It is shown that the addition of glycerin supports the extraction of anthocyanins to some extent; however, it results in a reduction of the color photostability of extracts used to dye cotton fabrics.

Growth of Vaccinium myrtilis L. (Ericaceae) in spruce forests damaged by air pollution

Kukla J., Kuklova M.

Polish Journal of Ecology

2008

Vol. 56, nr 1

149-155

The growth parameters of the Vaccinium myrtillus shoots were studied on a vertical transect crossing localities "Muran" (1080-1110 m a.s.l., skeli-humic podzols, Fageta abietino-piceosa) and "Hliniky" (950-960 m a.s.l, dystric cambisols, Abieti-Fageta inferiora) in the protected zone of the National park "Slovensky raj" (Spis region, East Slovakia). In the localities, both contaminated by air pollution research plots in undamaged and damaged (with lower stand density and canopy compactness) spruce ecosystems were established. The content of Al and Cr was significantly higher in cambisols, and that of Cd - in podzols. The limit values calculated for both soils have been exceeded only in case of mercury. The Al content in bilberry twigs exceeded the background values (by 44-76%) in case of the both plots situated on locality "Muran", and that of Ni and Pb concentrations (by 3-60%) only on damaged plot. The mean content of Ni and Pb was significantly higher in bilberry twigs growing on podzols and the mean content of Al was significantly higher in plants on undamaged plots. The mean length, weight as well as energy content of bilberry twigs were significantly higher in damaged spruce plots (on average by 33%), probably due to favourable light conditions.