Extraction of pinocembrin from leaves of different species of Eucalyptus and its quantitative analysis by qNMR and HPTLC.

Pinocembrin, a flavanone with a variety of biological activities was isolated from Eucalyptus sieberi leaves and quantified in several other Eucalyptus species using qNMR and HPTLC densitometry. The effect of different extraction procedures on the extraction of the compound from Eucalyptus sieberi was also studied. The methods were validated in terms ofselectivity, specificity, linearity, recovery, precision and repeatability.