Summary Introduction: There is a high interest in creating medicines, dietary supplements, cosmetics including plant extract with antioxidant activity. For understanding whether plant extract has a maximum level of antioxidant activity it is important to know the total antioxidant activity of raw material. Objective: The main goal of study was to find out the green tea leaves total antioxidant activity. Methods: The antioxidant activity was measured by potentiometric method. Total phenolic, flavonoids, catechins and hydrocinnamic acids derivatives were quantified using Folin-Ciocalteu, aluminium chloride, vanillin and sodium molibdate methods, respectively. Results: The green tea leaves total antioxidant activity was 660.75 mmol-eqv./mres. dry weight. A significant correlation was observed between the amount of phytochemicals and antioxidant activity, which indicated its main role in antioxidant activity. Conclusion: The research showed that the green rea leaves possess a high value of antioxidant activity and it is a good source of phenolic constituents.
Much attention is currently paid to the study of the antioxidant properties of various objects – individual antioxidants, dietary supplements, medicines, liquid plant extracts. Antioxidant medicines are widely used as the main or additional correction agents in the treatment of a number of diseases. Therefore, the study and development of procedures for determining the antioxidant activity is a prospective task for today. Aim. To determine the contribution of different concentrations of ethanol to the level of the antioxidant activity (AOA) of ascorbic acid solutions by the potentiometric method. Results and discussion. The different ethanol content in the solution had the following percent of the contribution to the value of AOA of ascorbic acid solutions – 1.85, 3.56, 4.89, 6.76, 7.63 % for 20, 40, 60, 80, 96 % ethanol, respectively. The linearity of the procedure was proven in the range from 0.039 to 0.31 mmol/L. Experimental part. The object of the study was solutions of ascorbic acid prepared using ethanol of different concentrations – 20, 40, 60, 80, 96 %. Potentiometric measurements were conducted by a Hanna 2550 pH meter (Germany) with an EZDO 5010 combined platinum electrode. Weighing was carried out using an АN100 digital analytical balance (AXIS, Ukraine) with d = 0.0001 g. Ascorbic acid was purchased from Sigma Aldrich (≥ 99.0 %), K3[Fe(CN)6], K4[Fe(CN)6], NaHPO4, KH2PO4 were of analytical grade. Conclusions. It has been found that ethyl alcohol affects the change of the potential in the electrochemical cell and the level of AOA of ascorbic acid solutions. The percentage of the contribution of different concentrations of ethyl alcohol to the AOA value ranges from 1.85 to 7.63 %. The approach and the formula for calculation that take into account the effect of ethyl alcohol on the final AOA result of the test sample of ascorbic acid in a water-alcohol solutions have been proposed. The results of this study can be used in the pharmaceutical and food industries to determine, assess and control the AOA level of dietary supplements, liquid extracts, tinctures, medicines, and alcoholic beverages.
Aim. To develop the composition and technology for obtaining a dietary supplement “Cachinol” with the antioxidant activity in the form of granules used in the polycystic ovary syndrome. Materials and methods. To achieve the goal, physical, physicochemical, pharmacotechnological and statistical research methods, as well as generally accepted research methods of the State Pharmacopoeia of Ukraine (SPhU) 2.0 were used in the work. Results and discussion. The rational dosage form is granules. The green tea leaf extract and myo-inositol were chosen as the active pharmaceutical ingredients of granules. For 3 batches of granules, the following parameters were determined: the fractional composition ranging from 13.2 to 17.9 % for 3-2 mm, from 45.3 to 56.2 % for 2-1 mm, from 20.1 to 26.1 % for 1-0.5 mm, from 8.1-12.4 for 0.5-0.25 mm, from 2.95-4.6 % for < 0.25 mm; the moisture content of granules ranging from 2.80-3.10 %; the bulk density – from 0.49 to 0.52 g/cm3, the tapped density – from 0.54 to 0.58 g/cm3; the flowability was in the range of 8.00-8.25 g/s; the angle of repose – from 30 to 33°; disintegration – from 41 to 45 s. Conclusions. The flowchart for obtaining granules in industrial conditions has been developed. The technological process for obtaining granules consists of 8 technological stages. The studies of the technological parameters of granules have been performed in accordance with the requirements of the SPhU 2.0. It has been found that the granules developed meet the requirements of the SPhU 2.0 and can be recommended for further research.
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