Contribution of tea ( Camellia sinensis L .) to recommended daily intake of Mg, Mn, and Fe: An in vitro bioaccessibility assessment

Simplified Method of Multi-Elemental Analysis of Dialyzable Fraction of Tea Infusions by FAAS and ICP OES

“…Bioaccessibility of Fe was relatively low, i.e., 4.4-13.2% (with the mean of 9.1% and CV of 31%) for infusions of BTs and 8.0-15.6% (with the mean of 11.9% and CV of 17%) for infusions of GTs. These results well corresponded to a general trend noted for Fe, but were higher than those reported by Powell et al [22] for BT, but lower than those determined by Erdemir [25] for BTs and GTs, or Szentmihalyli et al [15] and Pereira Junior et al [29] for herbal teas. Such variability in results achieved for Fe could again be related to differences in composition of analyzed teas, as well as dissimilar approaches taken to simulate absorption in a small intestine, including different compositions of SGJs and SIJs.…”

“…Mean contribution of the bioaccessible fraction of Mg was slightly lower than this for Ca and equaled to 39.9% (CV of 4.5%) for infusions of BTs and 43.5% (CV of 4.8%) for infusions of GTs. These results were seemingly lower than those for infusions of other BTs (by~40% as reported by Powell et al [22] and Erdemir [25]), herbal teas (by~40% as reported by Szentmihalyli et al [15] and~20% as reported by Pereira Junior et al [29]), and GTs (the smallest,~5% difference was found as reported by Erdemir [25]). Such differences could probably be caused by compounds potentially inhibiting Mg absorption, such as oxalates and polyphenols that commonly form poorly soluble complexes with this metal in a small intense.…”

“…Mean contribution of Fig. 1 Mean contribution of the bioaccessible fraction (in %) of determined metals for infusions of different types of tea: bagged black teas (BTBs), leaf black teas (BTLs), bagged green teas (GTBs) and leaf green teas (GTLs) (a) and black teas (BTs) and green teas (GTs) (b) the bioaccessible fraction of Cu in infusions of BTs and GTs was practically the same, i.e., 25.1% (CV of 21%) and 23.8% (CV of 18%), respectively. Similarly to other metals, i.e., Fe and Zn, relatively low bioaccessibility of Cu from infusions of BTs and GTs was probably caused by composition of these teas and the presence of various endogenous ligands willingly complexing this metal, in particular phytates [30].…”

“…Samples of infusions after in vitro GID were centrifuged, and their supernatants were analyzed by FAAS. Similarly, contributions of the bioavailable fraction of Li [24] and Mg, Mn, and Fe [25] from infusions of six BTs and GTs were evaluated. As before, no membrane ultrafiltration was used to imitate absorption of these metals in the villi.…”

Method Validation for Multi-Elemental Analysis of Dialyzable and Non-dialyzable Fractions of Coffee Brews by F AAS and ICP OES: a Bioaccessibility Study

“…In recent years, in vitro gastrointestinal digestion has been applied to estimate bioaccessibility of elements from various food products and beverages, including fruit juices (Cautela et al 2009;de Lima et al 2014;Haro-Vicente et al 2006), infant formulas (Bermejo et al 2002;do Nascimento da Silva et al 2017), tea (Powell et al 1998;Erdemir 2018), herbal infusions (Pereira Junior et al 2018;Zhou et al 2014), GCs and ICs (Stelmach et al 2014(Stelmach et al , 2016, slim coffees (Szymczycha-Madeja et al 2015), chocolate drink powder (Peixoto et al 2013), various milks (Bermejo et al 2002;Chaiwanon et al 2000;Shen et al 1995), honey (Pohl et al 2012), fruits and vegetables (do Nascimento da Silva et al 2015;Khouzam et al 2011;Machado et al 2017;Oliveira et al 2018;Pereira et al 2016), breads (Gawlik-Dziki et al 2009;Khouzam et al 2011;Lamsal and Beauchemin 2015), cereals (do Nascimento da Silva et al 2017), white cheeses (Khouzam et al 2011), various meats (Menezes et al 2018), and edible seaweeds (Dominguez-Gonzalez et al 2010;García-Sartal et al 2011. Commonly, a two-step procedure that simulates stomach and intestinal digestion with solutions of pepsin in the gastric phase and a mixture of pancreatin and bile salts in the intestinal phase is used.…”