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Abstract
The article investigates the qualitative characteristics of phosphate-buffered extracts obtained from the leaves and fruits of woody and shrub species growing across various mountain ranges in Eastern and Southeastern Kazakhstan. Samples of Rosa acicularis, Rosa albertii, Rosa tarbagataica, Prunus armeniaca and Prunus bucharica were used as research materials. Extraction was performed using a 50 mM phosphate buffer at pH 7.0. The obtained extracts were evaluated for colour, turbidity, sediment formation, and stability.
The results revealed distinct qualitative differences among plant species and the examined plant organs. Leaf extracts were generally characterised by dark green or brownish-green colouration and higher turbidity. In contrast, fruit extracts exhibited a yellowish or light-brown colour and were more transparent. Samples belonging to the genus Rosa showed higher turbidity and more pronounced sediment formation, whereas fruit extracts of the genus Prunus were characterised by greater stability and lower turbidity.
The findings indicate that the phosphate-buffered system is a suitable medium for obtaining plant extracts and allows a comparative assessment of the qualitative characteristics of extracts from different plant species. The results may serve as baseline data for planning subsequent biochemical analyses and studies.