Abstract
A complex of biologically active substances was isolated from birch bark (Betula pendula) by the method of supercritical fluid extraction. Phase and relaxation transitions (melting, crystallization, evaporation, glass transition) in the obtained samples have been studied by the method of differential thermal analysis in the range of 80–550 K. Betulin was isolated from CO2 extracts of birch bark and purified. Its heat capacity has been measured in the range of 80–350 K, and the temperatures of relaxation and phase transitions, as well as thermochemical characteristics (standard combustion and formation enthalpy), have been determined.
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References
K. G. Bogolitsyn, Ross. Khim. Zh. 48(6), 105 (2004).
A. A. Pichugin and V. V. Tarasov, Russ. Chem. Rev. 60, 1249 (1991).
F. M. Gumerov, A. N. Sabirzyanov, and G. I. Gumerova, Sub- and Super Critical Fluids in Processes of Polymers Processing (FEN, Kazan, 2007) [in Russian].
A. R. Vodyanik, A. Yu. Shadrin, and M. Yu. Sinev, Sverkhkrit. Fluidy: Teor. Prakt. 3(2), 58 (2008).
L. M. Kustov and I. P. Beletskaya, Ross. Khim. Zh. 48(6), 3 (2004).
The Role of Thermodynamics as a Base for the Development of Fundamental Investigations, Standartization and Technologies, Ed. by Yu. A. Lebedev (Akademkniga, Moscow, 2007)
A. N. Kislitsyn, Khim. Drev., No. 3, 3 (1994).
G. A. Tolstikov, O. B. Flekhter, E. E. Shul’ts, L. A. Baltina, and A. G. Tolstikov, Khim. Interesah Ustoich. Razvit. 13(1), 1 (2005).
S. Alakurtti, T. Mäkelä, S. Koskimies, and J. Yli-Kauhaluoma, Eur. J. Pharm. Sci. 29, 1 (2006).
T. G. Tolstikova, I. V. Sorokina, G. A. Tolstikov, A. G. Tolstikov, and O. B. Flekhter, Bioorg. Khim. 32(1), 42 (2006).
A. A. Semenov, Essays of Chemistry of Natural Products (Nauka, Novosibirsk, 2000) [in Russian].
RF Patent No. 2264442 (2005).
M. A. Mikhailenko, T. P. Shakhtshneider, M. E. Brezgunova, V. A. Drebushchak, S. A. Kuznetsova, and V. V. Boldyrev, Khim. Rastit. Syr’ya, No. 2, 63 (2010).
V. M. Malyshev, G. A. Mil’ner, E. L. Sorkin, and V. F. Shibakin, Prib. Tekh. Eksp. 6, 195 (1985).
R. M. Varushchenko, A. I. Druzhinina, and E. L. Sorkin, J. Chem. Thermodyn. 29, 623 (1997).
K. V. Kir’yanov and V. I. Tel’noi, in Works on Chemistry and Chemical Technology, Interschool Collection (Gor’k. Gos. Univ., Gorky, 1975), Part 4, p. 109 [in Russian].
Thermal Constants of Substances, The Manual, Ed. by V. P. Glushko (VINITI, Moscow, 1965, 1966, 1970), Nos. 1, 2, 4 [in Russian].
V. F. Ur’yash, Doctoral Dissertation in Chemistry (Sci. Inst. of Chemistry, NNovg. State Univ., Nizh. Novgorod, 2005).
P. D. Garn and O. J. Menis, Macromol. Chem. B 13, 611 (1977).
D. F. Westrum, Jr. and J. P. McCullough, in Physics and Chemistry of the Organic Solid State, Ed. by D. Fox, M. M. Labes, and A. Weissberger (Interscience, London, 1965; Mir, Moscow, 1967), p. 9.
I. B. Rabinovich, A. N. Mochalov, L. Ya. Tsvetkova, T. B. Khlystova, Ye. M. Moseyeva, and V. A. Maslova, Acta Polym. 34, 482 (1983).
V. F. Uryash, I. B. Rabinovich, A. N. Mochalov, and T. B. Khlyustova, Thermochim. Acta 93, 409 (1985).
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Original Russian Text © V.F. Ur’yash, N.Yu. Kokurina, V.N. Larina, E.A. Kashtanov, A.E. Gruzdeva, 2014, published in Sverkhkriticheskie Flyuidy: Teoriya i Praktika, 2014, Vol. 9, No. 2, pp. 51–63.
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Ur’yash, V.F., Kokurina, N.Y., Larina, V.N. et al. Physicochemical properties of Betulin and CO2 extract from birch bark. Russ. J. Phys. Chem. B 8, 1100–1109 (2014). https://doi.org/10.1134/S1990793114080181
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DOI: https://doi.org/10.1134/S1990793114080181