Green tea preparation and its influence on the content of bioactive compounds

Influence of shooting period and extraction conditions on bioactive compounds in Turkish green tea

“…The values within a column with different superscript letters are significantly (P < 0.01) different. in some previous studies (Samaniego-Sanchez et al, 2011;Komes et al, 2010).…”

“…Catechins (about 10% of the dry weight basis) are the most prevalent flavonoids in green tea (Komes et al, 2010). They are divided into four primary compounds, i.e.…”

“…There are many studies on green tea polyphenols especially associated with extraction conditions such as solvent type, extraction time, extraction temperature, agitation and loading percentage (Hertog et al,1993;Khokhar & Magnusdottir, 2002;Perva-Uzunalić et al, 2006;Xi et al, 2009;Komes et al, 2010). Also according to Wang & Helliwell (2001), the extraction efficiency of polyphenols depends on the extraction time, temperature, pH and type of solvents.…”

Physicochemical properties of Turkish green tea powder: effects of shooting period, shading, and clone

“…4.6. Total phenolic content and antioxidant capacity Komes et al (2010) reported that the total phenolic content of water extract of green tea powder (1 g of green tea powder in 100 mL of water) was 2.23 g GAE L -1 , which corresponds to 22.3 g GAE 100 g -1 of dry powder. Our results were in agreement with the above-mentioned report.…”

“…As different authors express their results in different bases and units, it is hard to compare the present results with literature values directly. For example, reported IC 50 values of green tea products are 1.72-12.54 mmol L -1 Trolox equivalent for green tea powder (Komes et al, 2010), 1.722-1.827 mg mL -1 extract Trolox equivalent (Andlauer and Héritier, 2011), and 72.98 µM g -1 dw Trolox equivalent (Park et al, 2010) for green tea.…”