Loading...

Optimisation of a microwave-assisted method for extracting withaferin A from Withania somnifera Dunal. using central composite design

Mirzajani, F ; Sharif University of Technology | 2010

1426 Viewed
  1. Type of Document: Article
  2. DOI: 10.1002/pca.1230
  3. Publisher: 2010
  4. Abstract:
  5. Introduction - Recently, there have been growing attention on the modification and optimisation of new extraction and quantification methods, caused by the lack of environmentally friendly methodologies for the extraction of phytochemicals from complex matrices. In the case of pharmaceutical compounds, not only the extraction procedure but also the analysis method should be efficient, precise, fast and easy.Objectives - The essential pharmaceutical characteristics and trace concentration of withanolides led us to modify and optimise the previously reported extraction and quantification procedure for withaferin A (WA) as a candidate for withanolides.Matrial and methods - The WA from the air-dried aerial part of Withania somnifera Dunal. was extracted using a microwave-assisted extraction (MAE) technique. Four variables affecting the extraction procedure were optimised using the central composite design approach. The method of high-performance thin-layer chromatography assay was validated and applied for the quantification of each experiment.Results - The optimum values of factors were: extraction time (150 s), extraction temperature (68°C) and 17 mL of methanol water in the ratio 25 75 as extracting solvent. The solvent system consisted of ethyl acetate toluene formic acid 2-propanol (7.0 2.0 0.5 0.5, v/v/v/v), and densitometric scanning at 220 nm was applied for the analysis. The dynamic linear range, LOD, LOQ and recovery with the inter-day, and intra-day RSDs of the developed method indicated the validity of the method.Conclusion - A pressurised MAE method for extracting WA from the plant's aerial part was optimised using factorial-based design. The net effect of time, temperature, solvent volume and its ratio suggests that the yield of WA increases until each factor reaches its optimum value, and decreases with further increase in temperature or solvent ratio. Copyright © 2010 John Wiley & Sons, Ltd.A pressurized microwave assisted extraction method was optimized using a factorial-based design for extracting withaferin A (WA) from the plant aerial part. Variables affecting the extraction procedure, including extraction time, extraction temperature, extracting solvent and solvent ratio, were optimized using central composite design. The method of high-performance thin-layer chromatography (HPTLC) assay was validated and applied for the quantification of each experiment. The WA was separated and detected using the HPTLC method
  6. Keywords:
  7. HPTLC ; Microwave-assisted extraction ; Withaferin A ; Withania somnifera Dunal ; 2 propanol ; Acetic acid ethyl ester ; Formic acid ; Methanol ; Toluene ; Withanolide ; Analytic method ; Central composite design ; Extraction ; Factorial analysis ; High performance liquid chromatography ; Microwave radiation ; Temperature ; Validity ; Antineoplastic Agents, Phytogenic ; Chromatography, Thin Layer ; Densitometry ; Drug Stability ; Microwaves ; Reproducibility of Results ; Software ; Solvents ; Withania ; Withanolides ; Withania somnifera
  8. Source: Phytochemical Analysis ; Volume 21, Issue 6 , 2010 , Pages 544-549 ; 09580344 (ISSN)
  9. URL: http://onlinelibrary.wiley.com/doi/10.1002/pca.1230/abstract;jsessionid=E21CFECAB8DC55DF423749D5199346F0.f03t01