Investigation of Inonotus obliquus (Pers.) Pil. Extracts and Melanins after RF-plasma Treatment of Raw Material

O.Yu. Kuznetsova ^a*, I.Sh. Abdullin ^a**, M.F. Shaekhov ^a***, G.K. Ziyatdinova ^b****, H.C. Budnikov ^b****

^a Kazan National Research Technological University, Kazan, 420015 Russia

^b Kazan Federal University, Kazan, 420008 Russia

E-mail: *kuznetsovaolga@mail.ru, **abdyllin_@ksty.ru, ***shaechov@kstu.ru, ****ziyatdinovag@mail.ru, *****Herman.Budnikov@kpfu.ru

Received December 9, 2015

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Abstract

High-frequency capacitive discharge (RF plasma) at low pressure was used as preliminary stage for the intensification of extraction from natural medicinal raw material. RF-plasma treatment was carried out in two modes differed by the nature of plasma-forming gas.

Chaga (Inonotus obliquus (Pers.) Pil.) known as the birch mushroom was selected as a perspective source of raw material. Extraction was carried out in two ways – remaceration and maceration. The analysis of chaga extracts and melanins was performed using traditional techniques including determination of physical and chemical, antioxidant and spectral characteristics.

The obtained extracts and melanins were compared to the control samples and literature data. RF-plasma treatment of medicinal raw material increased the yield of extractive substances, in particular of the main active component of chaga – melanin. The antioxidant activity of chaga extracts grew, while for melanins it remained at the level similar to that of control samples.

The IR spectral characteristics of the studied chaga melanins are similar and agree well with the literature data. Insignificant deviations in the position and intensity of absorption strips were observed for the samples after RF treatment. IR spectra of the studied chaga melanins are similar to those for mushroom melanins, thereby confirming the similarity in their nature.

RF-plasma treatment of chaga medicinal raw materials allows to modify them partially. The structural and mechanical properties of melanins modified by RF plasma remain the same.

Keywords: RF-plasma treatment, chaga, melanin, extraction, antioxidant activity

Acknowledgments. We are grateful to A.A. Chizhevskii (PhD in Chemistry, Senior Research Fellow, Department of Plasma Technology and Nanotechnology of High Molecular Weight Materials, Kazan National Research Technological University) for registration of IR spectra.

Figure captions

Fig. 1. IR spectra of chaga melanins obtained by: 1 – maceration (Fungi B12), 2 – remaceration (Fungi B1).

Fig. 2. IR spectra of chaga melanins obtained by maceration (Fungi B12): 1 – control; 1a – regime 1 (air); 1b – regime 2 (argon).

Fig. 3. IR spectra of chaga melanins obtained by remaceration (Fungi B1): 2 – control; 2а – regime 1 (air); 2b – regime 2 (argon).

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For citation: Kuznetsova O.Yu., Abdullin I.Sh., Shaekhov M.F., Ziyatdinova G.K., Budnikov H.C. Investigation of Inonotus obliquus (Pers.) Pil. extracts and melanins after RF-plasma treatment of raw material. Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2016, vol. 158, no. 1, pp. 23–33. (In Russian)

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