Optimizing Pretreatment of Medicinal Raw Materials by RFC Plasma before Extraction

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

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Abstract

Optimization of the RF-plasma treatment modes of chaga raw materials using the Statistica 6.0 software package has been performed. Mathematical design has been carried out to calculate the optimum parameters of RF-plasma treatment using three plasma-forming gases – argon, air, and nitrogen. Plasma treatment of chaga raw materials has been undertaken at the constant parameters: pressure P = 30.0 Pa, anodic current J = 0.7 A, gas consumption G = 0.04 g/s; the variable parameters were power U = 5.0÷7.0 kV and treatment duration at the high-frequency capacitor category of the lowered pressure t = 30÷60 min.

Optimization of four key parameters for extraction of chaga raw materials (solid residue, melanin yield, antioxidant activity of both extract and chaga melanin) depending on the chosen plasma-forming gas (argon, air, or nitrogen) has been achieved. The optimum modes of RF-plasma treatment allowing to obtain the extracts and melanin of chaga mushroom with the improved physicochemical and antioxidant characteristics have been calculated.

Keywords: chaga raw materials, extraction, RFC-plasma treatment, antioxidant activity

Figure captions

Fig. 1. Optimization of the RFC-plasma treatment modes for modification of chaga raw materials in agron used as a plasma-forming gas, anodic current J = 0.7 А, pressure P = 30.0 Pa, gas consumption G = 0.04 g/s. Variables – power and treatment duration. Response function: a) solid residue, g/100 ml; b) melanin yield, %; c) extract antioxidant activity, C/ml; d) melanin antioxidant activity, kC/100 g.

Fig. 2. Optimization of the RFC-plasma treatment modes for modification of chaga raw materials in air used as a plasma-forming gas, anodic current J = 0.7 A, pressure P = 30.0 Pa, gas consumption G = 0.04 g/s. Variables – power and treatment duration. Response function: a) solid residue, g/100 ml; b) melanin yield, %; c) extract antioxidant activity, C/ml; d) melanin antioxidant activity, kC/100 g.

Fig. 3. Optimization of the RFC-plasma treatment for modification of chaga raw materials in nitrogen used as a plasma-forming gas, anodic current J = 0.7 A, pressure P = 30.0 Pa, gas consumption G = 0.04 g/s. Variables – power and treatment duration. Response function: a) solid residue, g/100 ml; b) melanin yield, %; c) extract antioxidant activity, C/ml; d) melanin antioxidant activity, kC/100 g.

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For citation: Kuznetsova O.Yu., Abdullin I.Sh., Shaekhov M.F., Ziyatdinova G.K., Budnikov H.C. Optimizing pretreatment of medicinal raw materials by RFC plasma before extraction. Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2016, vol. 158, no. 2, pp. 197–206. (In Russian)


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