Determination of trace metal content of various herbal and fruit teas produced and marketed in Turkey

Çolak, Hakan; Soylak, Mustafa; Türkoğlu, Orhan

doi:10.5414/tep22192

Cited by 54 publications

(43 citation statements)

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“…Results for Mn presented in our study are generally comparable to those reported by Chen et al (2009), Colak et al (2005, Dash et al (2008), Narin et al (2004a, Malik et al (2008), McKenzie et al (2010) and Nookabkaew et al (2006). Concentrations of Fe in slim teas are very similar to those obtained by Aksuner et al (2012), Colak et al (2005), Kara (2009) andMcKenzie et al (2010), but higher than those determined by Chen et al (2009), Matsuura et al (2001 and Narin et al (2004b). Contents of Zn found in this work are consistent with the findings of Matsuura et al (2001) and Xie et al (1998).…”

Section: −1supporting

confidence: 82%

“…Teas and herbs can be an important source of such essential elements as Mn, Fe, Zn and Cu, which are crucial for biochemical reactions in the human body. Manganese activates numerous essential enzymes; Fe is within the hemoglobin molecule, Zn is necessary for an enzymatic activity among humans, while Cu is essential for the hemoglobin synthesis (Biego et al 1998;Colak et al 2005;Xie et al 1998). Concentrations of these micro-elements fulfill the following order: Mn>Fe>Zn>Cu.…”

Section: Slim Teasmentioning

confidence: 99%

“…As a rule, the decomposition of the matrix of tea samples is an indispensable and mandatory step before their elemental analysis by the majority of these spectrometric methods. Typically, the digestion is carried out by a conventional hot-plate or microwave-assisted heating of tea samples with oxidizing reagents, including HNO 3 , HNO 3 + H 2 O 2 , HNO 3 +H 2 SO 4 +H 2 O 2, HNO 3 +H 2 O 2 +HF, HNO 3 + HClO 4 , HNO 3 + HCl, HNO 3 + HCl + HF, (Aksuner et al 2012;Colak et al 2005;Kumar et al 2005;Narin et al 2004a,b;Dash et al 2008;Matsuura et al 2001;McKenzie et al 2010;Mierzwa et al 1998;Nookabkaew et al 2006;Salahinejad and Aflaki 2010;Shen and Chen 2008;Soylak et al 2007). Except for the mentioned wet ashing procedures, dry-ashing procedures, as described by the Association of Analytical Chemistry (Seenivasan et al 2008) or modifications of this official method (Chen et al 2009;Li et al 2006;Malik et al 2008;Narin et al 2004b), are also used at the stage of the sample preparation of tea before its spectrochemical analysis.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the determination of total concentrations of various macro-and micro-elements in different teas as well as medicinal plants is carried out with the use of flame atomic absorption spectrometry (FAAS) (Aksuner et al 2012;Colak et al 2005;Kumar et al 2005;Li et al 2006;Malik et al 2008;Narin et al 2004a,b;Seenivasan et al 2008;Soylak et al 2007), graphite furnace atomic absorption spectrometry (GF AAS) (Dash et al 2008;Seenivasan et al 2008), inductively coupled plasma optical emission spectrometry (ICP OES) (Chen et al 2009;Dash et al 2008;Kara 2009;Malik et al 2008;Matsuura et al 2001;McKenzie et al 2010;Mierzwa et al 1998;Özcan et al 2008), inductively coupled plasma mass spectrometry (ICP MS) (Kara 2009;Matsuura et al 2001;Nookabkaew et al 2006;Shen and Chen 2008) and X-ray fluorescence spectrometry (XRFS) (Salvador et al 2002;Xie et al 1998). As a rule, the decomposition of the matrix of tea samples is an indispensable and mandatory step before their elemental analysis by the majority of these spectrometric methods.…”

Section: Introductionmentioning

confidence: 99%

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Simple and Fast Sample Preparation Procedure Prior to Multi-element Analysis of Slim Teas by ICP OES

2014

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The knowledge about mineral content of slim teas is of great importance since the consumption of these beverages has rapidly increased for the past several years. An increasing popularity of these tea products is mainly attributed to their nutritional properties, flavor, taste and health effects. Therefore, the main goal of the present work was to develop a precise and accurate method of the multi-element analysis of slim teas by inductively coupled plasma optical emission spectrometry (ICP OES) without the need for a laborious and tedious sample treatment preceding spectrometric measurements. Five sample preparation procedures, i.e., the total decomposition in a mixture of HNO 3 and H 2 O 2 solutions using closed vessel microwave-assisted or open vessel hot-plate systems, the solubilisation in aqua regia or a tetramethyl ammonium hydroxide solution and the extraction in a diluted HNO 3 solution, were compared. The performance of the compared procedures was determined in terms of the precision and the accuracy of results achieved and limits of detection of elements. It was found that the solubilisation in aqua regia gave the best results, i.e., limits of detection between 0.15 and 98.4 ng l −1 , the precision within 0.6−3.0 % and the accuracy better than 5 %. The developed method of the analysis, being a useful alternative to timeconsuming wet digestion procedures, was successfully applied to the analysis of five slim tea products.

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Section: −1supporting

confidence: 82%

Section: Slim Teasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simple and Fast Sample Preparation Procedure Prior to Multi-element Analysis of Slim Teas by ICP OES

2014

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“…Heavy metals have been reported to have positive and negative roles in human life [9 -11]. Some metals like cadmium, lead and mercury are major contaminants of food supply and may be considered the most dangerous elements to our environment while others like iron, zinc and copper are essential for biochemical reactions in the body [12].…”

Section: Introductionmentioning

confidence: 99%

Determination of Physico-Chemical Properties of Pomegranate (punica granatum L.) Fruits of Dar es Salaam Tanzania

Hellen¹

2014

JFNS

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Abstract:The physicochemical composition of pomegranate (Punica granatum L.) fruits from Kimara, Dar es Salaam during open air storage ripening process were determined. The ash, titratable acidity, crude fat, crude fiber, moisture and sugars content were determined by proximate analysis. Ascorbic acid contents were determined using the 2,6-dichlorophenol-indophenol dye method while mineral elements and heavy metals were determined by Flame Atomic Absorption Spectrophotometry (FAAS). The fruits were always harvested at the mature stage and allowed to ripen during open air storage. The determinations were done immediately after arrival at the laboratory and thereafter at intervals of two days from the day of harvest to the 8 th day. The results showed that fresh pomegranate fruits had high moisture content range of (89.6%-77.5%), low titratable acidity (<0.86% ca), low crude fat (0.30 g/100 g-fw), low ash content (0.35 g/100 g-fw), moderate crude fibre content (4.20 g/100 g-fw), high ascorbic acid content (53.7 -20.4 mg/100 g-fw), high total sugars content (48.9% -29.1%), moderate reducing sugar content (42.0% -25.5%) and sucrose content (5.7% -2.0%). Of the mineral elements (K, Ca and Na) determined, the highest content was of Ca (1086 mg/100 g-fw.). Heavy metals (Fe, Zn, Cu, Pb and Cd) content was very low in the pomegranate fruits, ranging between <0.0015 mg/100 g-fw for Cd and 0.84 mg/100 g-fw for Fe. Except for sucrose which was increasing during storage ripening, the moisture content, acidity content, ascorbic acid content, total sugar content and reducing sugar content were all decreasing as the fruit was ripening while in storage. There were no significant changes during storage ripening for levels of crude fat, ash, minerals and heavy metals. The results of this study suggest that these fruits could highly contribute in the improvement of the nutrition of consumers.

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Heavy metal levels in leafy vegetables and some selected fruits

2010

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Determination of trace metal content of various herbal and fruit teas produced and marketed in Turkey

Cited by 54 publications

References 0 publications

Simple and Fast Sample Preparation Procedure Prior to Multi-element Analysis of Slim Teas by ICP OES

Simple and Fast Sample Preparation Procedure Prior to Multi-element Analysis of Slim Teas by ICP OES

Determination of Physico-Chemical Properties of Pomegranate (punica granatum L.) Fruits of Dar es Salaam Tanzania

Heavy metal levels in leafy vegetables and some selected fruits

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