Assessing similarity analysis of chromatographic fingerprints of Cyclopia subternata extracts as potential screening tool for in vitro glucose utilisation.
Anal Bioanal Chem
; 408(2): 639-49, 2016 Jan.
Article
em En
| MEDLINE
| ID: mdl-26542834
ABSTRACT
Similarity analysis of the phenolic fingerprints of a large number of aqueous extracts of Cyclopia subternata, obtained by high-performance liquid chromatography (HPLC), was evaluated as a potential tool to screen extracts for relative bioactivity. The assessment was based on the (dis)similarity of their fingerprints to that of a reference active extract of C. subternata, proven to enhance glucose uptake in vitro and in vivo. In vitro testing of extracts, selected as being most similar (n = 5; r ≥ 0.962) and most dissimilar (n = 5; r ≤ 0.688) to the reference active extract, showed that no clear pattern in terms of relative glucose uptake efficacy in C2C12 myocytes emerged, irrespective of the dose. Some of the most dissimilar extracts had higher glucose-lowering activity than the reference active extract. Principal component analysis revealed the major compounds responsible for the most variation within the chromatographic fingerprints, as mangiferin, isomangiferin, iriflophenone-3-C-ß-D-glucoside-4-O-ß-D-glucoside, iriflophenone-3-C-ß-D-glucoside, scolymoside, and phloretin-3',5'-di-C-ß-D-glucoside. Quantitative analysis of the selected extracts showed that the most dissimilar extracts contained the highest mangiferin and isomangiferin levels, whilst the most similar extracts had the highest scolymoside content. These compounds demonstrated similar glucose uptake efficacy in C2C12 myocytes. It can be concluded that (dis)similarity of chromatographic fingerprints of extracts of unknown activity to that of a proven bioactive extract does not necessarily translate to lower or higher bioactivity.
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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Extratos Vegetais
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Cromatografia Líquida de Alta Pressão
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Células Musculares
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Avaliação Pré-Clínica de Medicamentos
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Cyclopia (Planta)
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Glucose
Tipo de estudo:
Diagnostic_studies
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Evaluation_studies
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Screening_studies
Idioma:
En
Revista:
Anal Bioanal Chem
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
África do Sul