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    Phenolic composition and antioxidant activity of Salvia tomentosa Miller: Effects of cultivation, harvesting year, and storage
    (2013) Dinçer, Cüneyt; Tontul, İsmail; Çam, İhsan Burak; Özdemir, Kübra Sultan; Topuz, Ayhan; Şahin, Hilal Nadeem
    Salvia tomentosa is a common medicinal plant, and it is consumed as an herbal tea in some Mediterranean countries. It has been extensively collected from its natural habitat, and careless collection has caused the recent extinction of some plants. The present study was undertaken to cultivate S. tomentosa and compare the phenolic composition and antioxidant properties of wild and cultivated plants. Total phenolics, total flavonoids, and antioxidant activity of S. tomentosa ranged between 49.27 and 66.15 mg GAE g1 dry weight (dw), 36.27 and 40.83 mg catechin g1 dw, and 1.77 and 2.29 mg dw mg1 DPPH, respectively. Total phenolic content of the cultivated samples was higher than that of wild samples. Seventeen different phenolic compounds, comprising 7 phenolic acids and 10 flavonoids, were identified and quantified in S. tomentosa. As with the many Salvia species, rosmarinic acid was quantified as the main component of S. tomentosa. It was followed by caffeic acid, morin, p-coumaric acid, and myricetin. Chlorogenic acid, p-coumaric acid, morin, kaempferol, hesperetin, and apigenin were increased through cultivation; gallic acid, caffeic acid, ferulic acid, rutin, catechin, and epicatechin were decreased. During the 6-month storage only caffeic acid changed significantly.
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    Physicochemical properties of Turkish green tea powder: effects of shooting period, shading, and clone
    (2014) Tontul, İsmail; Topuz, Ayhan; Dinçer, Cüneyt; Torun, Mehmet; Şahin Nadeem, Hilal; Haznedar, Ayhan; Özdemir, Feramuz
    This study aimed to determine the physicochemical properties of the green tea powders produced from 2 different Turkish tea [Camellia sinensis (L.) O.Kuntze] clones (Derepazarı 7 and Fener) grown under different shade levels and harvested during 2 consecutive shooting periods. Moisture, ash, crude fiber, and total phenolic contents of the green tea powders were determined based on the experimental factors. Products were also evaluated for their water activity, bulk density, particle size, color, extraction yield, and antioxidant activity. The shooting period, specific to Turkish tea cultivation, showed remarkable effects on the main quality parameters of the green tea powders. It is noteworthy that the phenolic content and antioxidant activity of the products did not change significantly with treatments. The green tea powder produced from Derepazarı 7 clone, grown under dark shade and harvested in the first shooting period, was superior among the tested parameters.