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2013 | 35 | 04 |

Tytuł artykułu

Variations in the chemical profile and biological activities of licorice (Glycyrrhiza glabra L.), as influenced by harvest times

Warianty tytułu

Języki publikacji

EN

Abstrakty

EN
This study investigates the variations in the chemical profile, free radical scavenging, antioxidant and gastroprotective activities of licorice extracts (LE) from plants harvested during the months of February to November. Correlations between biological properties and the chemical composition of LE were also investigated. The results showed that the total contents of phenols, flavonoids and tannins in LE varied at different harvest times. Liquiritin and glycyrrhizin, the major components of LE, varied in the range of 28.65–62.80 and 41.84–114.33 mg g-1, respectively. The relative proportion of glycyrrhizin derivative (3), glabridin (4), glabrene (5) and liquiritigenin derivative (6), varied in the range of 0.88–11.38 %, 1.86–10.03 %, 1.80–18.40 % and 5.53– 16.31 %, respectively. These fluctuations correlated positively with changes in the antioxidant and free radical scavenging activities of licorice. In general, the samples from May and November showed the most favorable free radical scavenging and antioxidant effects, whereas the best gastroprotective effect was in May. Liquiritin and glycyrrhizin, the major constituents in the February and May LE, appeared to contribute to the superoxide radical scavenging and gastroprotective effects. Glabridin and glabrene, the compounds with the highest relative proportion in the November LE, accounted for the antioxidant and DPPH scavenging activities of licorice. It is concluded that the chemical profile of licorice quantitatively varied at different harvest times and these fluctuations determined changes in its bioactivities. These data could pave the way to optimize harvesting protocols for licorice in relation with its health-promoting properties.

Słowa kluczowe

Wydawca

-

Rocznik

Tom

35

Numer

04

Opis fizyczny

p.1337-1349,fig.,ref.

Twórcy

autor
  • Department of Pharmacognosy, Faculty of Pharmacy, Charles University in Prague, Heyrovske´ho 1203, 500 05 Hradec Kra´love´, Czech Republic
  • Department of Research and Development, Contipro Biotech s.r.o, Dolnı´ Dobroucˇ 401, 561 02 Dolnı´ Dobroucˇ, Czech Republic
autor
  • Department of Pharmacognosy, Faculty of Pharmacy, Charles University in Prague, Heyrovske´ho 1203, 500 05 Hradec Kra´love´, Czech Republic
autor
  • Departamento de Quı´mica, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile
  • Laboratory of Pharmaceutical Chemistry and Analytical Platform of the Faculty of Pharmacy, Universite Libre de Bruxelles, 1050 Brussels, Belgium
autor
  • Laboratory of Pharmaceutical Chemistry and Analytical Platform of the Faculty of Pharmacy, Universite Libre de Bruxelles, 1050 Brussels, Belgium
  • Laboratory of Experimental Medicine, CHU Charleroi, Universite Libre de Bruxelles, 6110 Montigny-le-Tilleul, Belgium
  • Departamento de Quı´mica, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile
autor
  • Department of Pharmacology and Toxicology, Faculty of Pharmacy, Charles University, Heyrovske´ho 1203, 500 05 Hradec Kra´love´, Czech Republic
autor
  • Department of Biochemical Sciences, Faculty of Pharmacy, Charles University, Heyrovske´ho 1203, 500 05 Hradec Kra´love´, Czech Republic
  • Faculty of Horticulture, Mendel University in Brno, Valticka´ 337, 691 44 Lednice, Czech Republic

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