The Study of the Kinetics of Obtaining Betulin and Extractive Substances from the Birch Tree Bark

Abstract:

Birch bark attracts attention of researchers as a source of betulin and other extractive substances (ES) useful for chemical, pharmaceutical and food industries. A challenge is to develop an efficient way of obtaining these bioactive agents. This paper presents a microwave-assisted technique of extracting these substances from the waste birch bark of the plywood industry. The kinetics of the extraction was investigated. With the process going on in the pore-diffusion area, the hydrodynamic conditions of the operation are discussed. An algorithm for calculating the kinetics of the procedure was developed and experimentally confirmed. The estimations for the process were made at constant values of the internal diffusion coefficient. The value of the coefficient was found to be a function of the birch bark fragments dimensions. An equation was established to estimate the duration of the extraction to obtain the given yield of ES and betulin.

• Periodical: Journal of Metastable and Nanocrystalline Materials (Volume 29)
• Pages: 42-47
• DOI: https://doi.org/10.4028/www.scientific.net/JMNM.29.42
• Online since: August 2017
• Authors: Sergei I. Tretiakov*, Elena N. Koptelova, Natalia A. Kutakova, Nina V. Bagretsova, Nadezhda L. Voropaeva
• Keywords: Betulin, Birch Bark, Extractive Substances, Kinetics, Microwave-Assisted Extraction

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