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Cluster analysis of commercial samples of Bauhinia spp. using HPLC‐UV/PDA and MCR‐ALS/PCA without peak alignment procedure
Author(s) -
Ardila Jorge Armando,
Funari Cristiano Soleo,
Andrade André Marques,
Cavalheiro Alberto José,
Carneiro Renato Lajarim
Publication year - 2015
Publication title -
phytochemical analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 72
eISSN - 1099-1565
pISSN - 0958-0344
DOI - 10.1002/pca.2571
Subject(s) - bauhinia , chemistry , principal component analysis , chromatography , christian ministry , high performance liquid chromatography , traditional medicine , artificial intelligence , computer science , medicine , philosophy , theology
Bauhinia forficata Link. is recognised by the Brazilian Health Ministry as a treatment of hypoglycemia and diabetes. Analytical methods are useful to assess the plant identity due the similarities found in plants from Bauhinia spp. HPLC‐UV/PDA in combination with chemometric tools is an alternative widely used and suitable for authentication of plant material, however, the shifts of retention times for similar compounds in different samples is a problem. Objective To perform comparisons between the authentic medicinal plant ( Bauhinia forficata Link.) and samples commercially available in drugstores claiming to be “ Bauhinia spp. to treat diabetes” and to evaluate the performance of multivariate curve resolution – alternating least squares (MCR‐ALS) associated to principal component analysis (PCA) when compared to pure PCA. Methodology HPLC‐UV/PDA data obtained from extracts of leaves were evaluated employing a combination of MCR‐ALS and PCA, which allowed the use of the full chromatographic and spectrometric information without the need of peak alignment procedures. Results The use of MCR‐ALS/PCA showed better results than the conventional PCA using only one wavelength. Only two of nine commercial samples presented characteristics similar to the authentic Bauhinia forficata spp., considering the full HPLC‐UV/PDA data. Conclusion The combination of MCR‐ALS and PCA is very useful when applied to a group of samples where a general alignment procedure could not be applied due to the different chromatographic profiles. This work also demonstrates the need of more strict control from the health authorities regarding herbal products available on the market. Copyright © 2015 John Wiley & Sons, Ltd.