Reversed phase HPLC with UV detection at 210nm has been used to determine constituents in commercial Stevia products, but the methodology is limited in its ability to separate all components of interest, especially when higher order oligosaccharides are present. Another problem is that any single UV wavelength is a detection compromise as the constituents exhibit a wide range of absorbance maxima (193, 204, 236, 238, 284nm). Some are only weakly chromophoric.
The Evaporative Light Scattering Detector (ELSD) is a valuable complement to spectroscopic detectors for HPLC. The ELSD makes a measurement of photons scattered from semi- and non-volatile particles that have been dried of mobile phase through evaporation. Because its response is independent of the light absorbing properties of molecules, it can reveal sample components that UV detectors miss and provide a more accurate profile of relative component abundance than is possible with a spectroscopic detector.
Here i had attach an application note of Shimadzu. Hope it will we helpful to you
Thank you guys..rebaudioside a is my interest compound..in the paper using 150mm of column but i think in my extraction i need longer column maybe 250mm bcoz diterpene glycosides contain many compound to avoid problems later. I'll try soon, hope for the best.
Fast and isocratic HPLC-method for steviol glycosides analysis from Stevia rebaudiana leaves
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