Coefficient of diffusion of tannins in ethanol extracts from Physalis alkekengi L. leaves

• Published in: IOP conference series. Materials Science and Engineering Vol. 1031; no. 1; pp. 12093 - 12097
• Main Authors: Popova, V T, Tasheva, S T, Ivanova, T A, Stoyanova, A S
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.01.2021
• Subjects: Coefficient of variation; Ethanol; Leaves; Mass transfer; Molecular diffusion; Nutrients; Nutrition; Solvents; Tannins
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/1031/1/012093

Physalis alkekengi L. (Solanaceae) is a wild growing plant, native to Bulgaria. The plant produces edible fruit rich in phytonutrients; the fruit and the leaves have been used in Bulgarian and other folk medicines for centuries. The leaves of P. alkekengi can be considered as a promising resource for obtaining extracts rich in bioactive ls is performed by molecular diffusion; a generalized indicator of the diffusive properties is the coefficient of diffusion (D). It takes individual values for different plant matrices and depends on various factors in the mass transfer process. To the best of our knowledge, there are no data about the diffusion coefficients of tannins in P. alkekengi leaf extracts, which was set as the objective of the study. Extraction was carried out in a batch static mode, under the following conditions: raw material to solvent ratio of 1:33 (w/v); size of leaf particles - 0.0125 m χ 0.002 m; duration of extraction - 1 h, with the solvent being replaced and analyzed for extracted tannins after each 600 s; solvents - 95%, 70%, 50%, and 30% ethanol; temperature - 20°C, 40°C and 60°C. The values of the coefficient showed variation over time and temperature, for each of the solvents. The highest D value obtained was 0.1690.10-9 m2.s-1 (70% ethanol, 60°C). These are the first data about the coefficient of diffusion of tannins in ethanol extracts from Physalis alkekengi L. leaves.