Development of a multivariate calibration model for the
determination of dry extract content in Brazilian commercial bee propolis
extracts through UV-Vis spectroscopy
Spectrochim Acta A Mol Biomol Spectrosc, 2013 Oct;114:441-8
This study had the objective of determining the content of
dry extract of commercial alcoholic extracts of bee propolis through Partial
Least Squares (PLS) multivariate calibration and electronic spectroscopy.
The PLS model provided a good prediction of dry extract
content in commercial alcoholic extracts of bee propolis in the range of 2.7 a
16.8% (m/v), presenting the advantage of being less laborious and faster than
the traditional gravimetric methodology. The PLS model was optimized with
outlier detection tests according to the ASTM E 1655-05. In this study it was
possible to verify that a centrifugation stage is extremely important in order
to avoid the presence of waxes, resulting in a more accurate model.
Around 50% of the analyzed samples presented content of dry
extract lower than the value established by Brazilian legislation, in most
cases, the values found were different from the values claimed in the product's
label.
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