Pericarp of colored-seeded common bean (Phaseolus vulgaris L.) varieties a potential source of polyphenolic compounds

摘要

Bioactive substances produced by plants are defined as secondary metabolites causingdifferent pharmacological effects in human organism. Various plant raw materials, some knownas vegetables or spices, are their source. Pericarp of white-seeded common bean varieties is apharmacopoeial product traditionally used as an antidiabetic agent. The object of this study wasto evaluate the biological value of pericarp of colored beans (cultivars: ‘Ma?opolanka’, ‘Nida’,‘Rawela’, ‘Tip Top’, and ‘Nigeria’) compared to the reference white-seeded cultivar (‘Laponia’).Bean pericarp was characterized by a high level of polyphenolic compounds and antioxidantactivity. Its phenolic acid content (expressed as caffeic acid equivalents) was at a similar level, atleast 0.1 mg g-1 (0.01%). The highest amount of flavonoids was accumulated by the cultivars withdark blue and black seeds, respectively 0.138 and 0.139 mg g-1 DW, as well as by the whiteseededcultivar (0.132 mg g-1 DW). The highest antioxidant activity (AA) was found for beanextracts of the cultivars ‘Laponia’ and ‘Ma?opolanka’, respectively 12.35 and 12.10%. Phenolicacid content was significantly positively correlated with AA of the bean extracts tested. Thisstudy indicates that pericarp of the colored-seeded bean cultivars is characterized by highbiological value and can be used as a source of polyphenolic compounds.