Download PDF by Kumar, S. (Eds.): Analytical techniques for natural product research

Download PDF by Kumar, S. (Eds.): Analytical techniques for natural product research

By Kumar, S. (Eds.)

ISBN-10: 1780644736

ISBN-13: 9781780644738

This booklet includes eight chapters concentrating on new mechanisms to urge and control the standard keep watch over of plant-based drugs. the significance of those options within the standardization of multi-component, plant-based formulations is additionally mentioned. on hand In Print

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Schulz, K. A. (1991) Supercritical fluid extraction/retrograde condensation with applications in biotechnology. J. F. (eds) Supercritical Fluid Technology. CRC Press, Boca Raton, Florida, pp. 451–478. , Paniwnyk, L. P. (1996) The uses of ultrasound in food technology. Ultrasonics and Sonochemistry 3, S253–S260. Matthaus, B. and Bruhl, L. (2001) Comparison of different methods for the determination of the oil content of oilseeds. Journal of American Oil Chemists Society 78, 95–102. L. L. (1997) Microwave-assisted extraction of taxnes from Taxus biomass.

6 Drying or Concentrating Extract Solvent removal from the extract is commonly carried out using evaporation, vacuum concentration, lyophilization, etc. The objective of solvent removal is to preserve the solute. The removal of solvent can be accomplished effectively by boiling. Solvent can be boiled off either by applying heat or by lowering the atmospheric pressure. In both cases, the energy of molecular motion is greater than the intermolecular forces holding the molecules in the solution, and as a result solvent molecules move from liquid phase to gaseous phase.

In closed-vessel extractors, the vessel containing the sample and solvent is closed, whereas in FOV-MAE it is open. In the case of CV-MAE, extraction is carried out under controlled pressure and temperature increase is achieved rapidly. Pressure depends on the volume and boiling point of the solvent as the solvents may be heated to about 100°C above their boiling point under atmospheric conditions in CV-MAE. The temperature can be fixed by adjusting the microwave power (100–1000 W), and power should be suitably chosen to avoid overheating, leading to degradation of analyte and overpressure.

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