Gabriela Palaghiciuc, Ion Baciu, Felicia Mihai, Paul Lazar<br>Influence of Irradiation Treatment on Antioxidant Compounds <br>from Echinacea species

Gabriela Palaghiciuc, Ion Baciu, Felicia Mihai, Paul Lazar
Influence of Irradiation Treatment on Antioxidant Compounds
from Echinacea species

Abstract:

This work studies the concentration change of antioxidant compounds from two species of Echinacea: purpurea and pallida upon treatment with the gamma radiation as compared with the initial state. The plants were supplied by Institute for Research and Development Braşov and were harvested in the fifth year of vegetation. The main goal is to establish the optimal dose of radiation in order to remove the microorganisms that produce alternariosis and fusariosis diseases. The study was carried out on leaves, seeds and aerial part of the plant. The gamma ray irradiation doses were 1 and 10 kGy (energy 1250 keV). Referring to Echinacea purpurea leaves, irradiation process leads to reduction of flavonoids content (decrease of 14.56% irrespective of radiation dose; the total phenols content lowers with 37.86% at 1 kGy and with 40.19% at 10 kGy, respectively. For Echinacea purpurea seeds, the irradiation causes a concentration increase of up to 10.43% in the total phenols content. By irradiation, chlorogenic and coffee acid quantities increase in the extracts obtained from seeds, especially for 1 kGy dose, and considerably decrease in samples of Echinacea purpurea leaves. A major decrease was obtained at 10 kGy for both acids: 93.19% for chlorogenic acid and 83.34% for caffeic acid . The irradiation leads to an insignificant concentration decrease of flavonoids and phenols for both 1 and 10 kGy irradiation doses. The reduction is even less pronounced in the case of Echinacea purpurea. For the plants cultivated in Romania and harvested in the fifth year of vegetation, 1 kGy irradiation dose is optimal for sterilization of Echinacea purpurea leaves and seeds and Echinacea pallida aerial part. Keywords: Echinacea purpurea (L.) Moench, Echinacea pallida (Nutt.), radiation doses, antioxidants, flavonoids, total phenols

Issue: 2009, Volume 60, Issue 10

Pages:

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