تغيرات المحتوى الكلي للفينولات و الفلافونوئيدات في المستخلصات المائية من أوراق المليسة الطازجة خلال مراحل النمو

Abstract EN

In this study, the total content of phenols and flavonoids of infusion of Lippia Citriodora fresh leave's, which prepared in two method: infusion and continuous infusion, are determined in three stages of growth: in May, which approves the highest rate of growth, July, mid-season, and October, full bloom.

The effect of the time of soaking on the concentration of phenols and flavonoids free from plant tissue is studied.

The results showed that the highest content of phenols is in July (30.1 ± 2.64 mg GE/1 g per plant), while decrease in May and October about 40-41% of the concentration due to entry in the metabolic reactions of phasic growth and flowering.

As noted the convergence of content of flavonoids (3.07±0.03 mg QE/1 g per plant) in May and July, while decreased in October about 36.6-40% of the concentration due to its function in flowers.

It was also noted that continuous infusion has the higher concentration of phenols and flavonoids than infusion without boiling.

Where infusion without boiling phenols and flavonoids concentration’s increase with time but the increasing proportion decreases with low temperature (sig>0.05).

As for the increase, is large for continuous infusion, but the concentration of each of the phenols and flavonoids decrease after 15 minutes because of the thermal decomposition.