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Original Article



Antioxidants and carbohydrate content in infusions and microwave extracts from eight medicinal plants

Nadezhda Petkova; Lili Ivanova; Gerasima Filova; Ivan Ivanov; Panteley Denev.

Abstract
The aim of the current research was to evaluate and to compare the antioxidant activity and the content of total phenolic, flavonoids and fructan content in infusions and microwave-assisted extracts from eight herbs: rosehip (Rosa canina L.), peppermint (Mentha piperita L.), thyme (Thymus vulgaris L.), coltsfoot (Tussilago farfara L.), dandelion (Taraxacum officinale Web.), elecampane (Inula helenium L.), great burdock (Arctium lappa L.) and echinacea (Echinacea purpurea Moench.). The total phenolic contents, total flavonoids and antioxidant activity were evaluated by Folin–Ciocalteau, Al(NO3)3 methods and DPPH assays. The total fructans and sugars were determinated by resorcinol and HPLC-RID methods. Infusion and microwave-assisted extraction (MAE) were evaluated as efficient methods for preparation of herbal drinks. The highest values of biologically active substances and antioxidant activity were found in MAE herbal extracts. Coltsfoot, thyme and great burdock extracts demonstrated the highest content of total phenolic and flavonoids. Coltsfoot and thyme extracts showed the highest antioxidant activity (334 mM TE g-1 and 287 mM TE g-1 dw, respectively). Fructans was found in coltsfoot (4.6%) and echinacea (3.9 %) leaves, in great burdock, dandelion and elecampane roots – 14 %, 34% and 44% dw, respectively. Elecampane and dandelion roots were evaluated as sources of prebiotic inulin.

Key words: medicinal plants;phenolic compounds;antioxidant activity;inulin



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