Chemical Characteristics of Poplar Type Propolis of Different Geographic OriginApidologie, 38 (2007) 306-306
Abstract - Validated spectrophotometric procedures were used to quantify three main groups of bioactive substances (phenolics, flavones/flavonols, flavanones/dihydroflavonols) in 114 samples of poplar-type propolis from different geographic origins.
From the results, we characterized raw poplar propolis in terms of minimum content of its bioactive components (antimicrobial and antioxidant) as follows: 45% resin, 21% total phenolics, 4% total flavones/flavonols; 4% total flavanones/dihydroflavonols, and a maximum Minimum Inhibitory Concentration (MIC) against S. aureus of 250 g/mL.
A significant negative correlation was observed between the amount of total phenolics and MIC.
The results indicate that measuring the concentrations of groups of active compounds, rather than individual components, is an appropriate approach in developing quality standards for propolis.
1 comment:
I was surprised to see the minimum inhibitory concentration (MIC) at the whopping 250 grams per milliliter, so I referred to the original abstract in Apidologie.
There, it is 250 micro grams, a thousand fold smaller.
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