Comparision of bioactive properties and phenolic comounds of the aerial parts of mountain tea (Sideritis phrygai Bornm) treated by Ultrasonic and Water-Bath extraction systems at different temperature and times



Havvanur Yılmaz, Nurhan Uslu, Mehmet Musa Özcan


Volume 29, Issue 3;
Pages: 155-161; 2023
ISSN: 2069-0053 (print), Agroprint;
ISSN (online): 2068-9551


Sideritis species are known as “mountain tea” in Turkey and are widely used as herbal tea. Total flavonoid amounts of the extracts of mountain tea treated by sonication and water-bath syatms at 90 oC and different times were recorded between 65.24 (6min) and 68.01 mg QE/g (9 min) to 63.79 (9 min) and 66.99 mgQE/g (6 min), respectively. Total phenolic values of the extracts of mountain tea extracted by sonication at 25,80 and 90 oC at different times were determined between 11.88 (3 min) and 12.60 mgGAE/g (9min), 9.74 and 16.34 mg GAE/g (6 mn) and 11.60 (3 min) and 16.62 mg GAE/g (9 min), respectively. Antioxidant activities of the mauntain tea extracts obtained by sonication system at 25,80, 90 oC and different times (3,6,9 min) were measured  between 3.67 (9 min) and 4.28 mmol/kg (3 min), 3.36 (6 min) and 3.75 mmol/kg (9 min) and 4.06 (9 min) and 4.21 mmol/kg (3 min), respectively. Rutin, catechin, caffeic acid, syringic acid, p-coumaric acid, ferulic acid, 3,4-dihydroxybenzoic acid were the main phenoliccompunds of mountain tea extracts obtained by sonication and water-bath systems. Rutin amounts of the extracts of mountain tea extracted by sonication and water-bath systems depending on extraction temperatures and times were identified between 39.49 (25 oC for 3 min) and 98.57 mg/100g (80 oC for 6 min) to 81.99 (90 oC for 9 min) and 544.23 mg/100g (90 oC for 3 min), respectively. In general, the highest routine values were found in the samples extracted in water-bath at 25 and 80 oC.

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