Availability of essential elements in Indian and US tea brands

Kumar, Ashok; Näir, A. G. C.; Reddy, Α. V. R.; Garg, A. N.

doi:10.1016/j.foodchem.2004.03.003

Cited by 101 publications

(66 citation statements)

References 19 publications

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“…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%

“…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%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2014

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“…However, those essential trace elements become toxic when their concentration become excessive. The high concentrations, as also depletion in the concentration of those essential trace elements, may cause various metabolic instabilities due to enzyme dysfunction [3,7,8]. Each elements has its own function and described in Table 1.…”

Section: Introduction * * * *mentioning

confidence: 99%

Assessment of Trace Element Daily Intake Based on Consumption Rate of Foodstuffs in Bandung City

et al. 2012

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Trace elements are required by human body and have a variety role in biochemical functions mostly as catalyst for enzymatic activity in human body. Some trace elements are essential since they are inadequately or not synthesized by human body. The deficiency or excess of those essential trace element may cause disease and be deleterious to health. Since food is the primary source of essential elements for humans and it is an important source of exposure to toxic elements either, the levels of trace elements in consumed food products must be determined. The determination of trace elements content in foodstuffs widely consumed in Bandung city were conducted to assess their daily intake and contribution to the recommended dietary allowance (RDA) values. Food samples were collected from traditional markets spread across five regions of the Bandung city and analyzed using neutron activation analysis (NAA). Quality control of data analysis was assessed using SRM NIST 1567a Wheat Flour and 1568a Rice Flour and gave good results with % recovery, 93.2 -104.8%; and %CV, 3.8-11.6%. A large variability of essential trace elements concentration in all types of foods analyzed were observed. The daily intake of Cr, Co, Mn, Se and Zn were supplied enough by the diet, except for Fe which found that almost all the foods analyzed were not give a satisfying contribution to the RDA value of Fe. These result were expected could provide information of nutritional status of the society and can be a reference for government and related institution to effectively making policies and solution for public health improvement.

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“…Analysis of mineral elements is most important to understand the pharmacological and nutritional values of medicinal plants. The elements present in the food at major, minor and trace levels are vital for human wellbeing and their ingestion in excess or limited amount can cause severe health problems [14,15]. Human body is in need of both metallic and non-metallic elements for healthy growth, development and proper functioning of the body.…”

Section: Introductionmentioning

confidence: 99%

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Availability of essential elements in Indian and US tea brands

Cited by 101 publications

References 19 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

Assessment of Trace Element Daily Intake Based on Consumption Rate of Foodstuffs in Bandung City

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