Determination of antioxidant activity, rutin, quercetin, phenolic acids and trace elements in tea infusions: Influence of citric acid addition on extraction of metals

Comparison and Validation of Different Alternative Sample Preparation Procedures of Tea Infusions Prior to Their Multi-Element Analysis by FAAS and ICP OES

“…Black and oolong teas are typically produced from older leaves, while green tea is made from the flush containing only young leaves (Szymczycha-Madeja et al 2012). When steeping tea leaves or brewing tea bags, different bioactive compounds are extracted into infusions making these beverages a valuable source of antioxidants and phytochemicals (Diniz et al 2015;Jeszka-Skowron et al 2015). Except for organic bioactive substances, infusions of black and green teas also contain various elements that are leached from tea leaves and enhance their pro-health activity (Jeszka-Skowron et al 2015).…”

“…When steeping tea leaves or brewing tea bags, different bioactive compounds are extracted into infusions making these beverages a valuable source of antioxidants and phytochemicals (Diniz et al 2015;Jeszka-Skowron et al 2015). Except for organic bioactive substances, infusions of black and green teas also contain various elements that are leached from tea leaves and enhance their pro-health activity (Jeszka-Skowron et al 2015). In case of a regular drinking of tea, particularly in countries where it is a traditional and popular drink, tea brews are regarded as an additional source of some essential metals, e.g., Ca, Co, Cr, Cu, Fe, K, Mg, Mn, Na, and Zn (Derun 2014;Jeszka-Skowron et al 2015).…”

“…Except for organic bioactive substances, infusions of black and green teas also contain various elements that are leached from tea leaves and enhance their pro-health activity (Jeszka-Skowron et al 2015). In case of a regular drinking of tea, particularly in countries where it is a traditional and popular drink, tea brews are regarded as an additional source of some essential metals, e.g., Ca, Co, Cr, Cu, Fe, K, Mg, Mn, Na, and Zn (Derun 2014;Jeszka-Skowron et al 2015). Unfortunately, non-essential and toxic metals, e.g., Al, Ba, Cd, Ni, and Pb, present in made teas are extracted as well (Jeszka-Skowron et al 2015;Ozdemir et al 2014).…”

“…In case of a regular drinking of tea, particularly in countries where it is a traditional and popular drink, tea brews are regarded as an additional source of some essential metals, e.g., Ca, Co, Cr, Cu, Fe, K, Mg, Mn, Na, and Zn (Derun 2014;Jeszka-Skowron et al 2015). Unfortunately, non-essential and toxic metals, e.g., Al, Ba, Cd, Ni, and Pb, present in made teas are extracted as well (Jeszka-Skowron et al 2015;Ozdemir et al 2014). The later metals could have a potentially negative effect on the well-being of consumers of tea, particularly associated with the accumulation of these metals in the human body (Jeszka-Skowron et al 2015;Ozdemir et al 2014;Szymczycha-Madeja et al 2012;Welna et al 2013).…”

“…Unfortunately, non-essential and toxic metals, e.g., Al, Ba, Cd, Ni, and Pb, present in made teas are extracted as well (Jeszka-Skowron et al 2015;Ozdemir et al 2014). The later metals could have a potentially negative effect on the well-being of consumers of tea, particularly associated with the accumulation of these metals in the human body (Jeszka-Skowron et al 2015;Ozdemir et al 2014;Szymczycha-Madeja et al 2012;Welna et al 2013).…”