Determination of Trace Elements in Herbal Tea Products and Their Infusions Consumed in Thailand

Nookabkaew, Sumontha; Rangkadilok, Nuchanart; Satayavivad, Jutamaad

doi:10.1021/jf060571w

Cited by 193 publications

(142 citation statements)

References 33 publications

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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).…”

Section: −1supporting

confidence: 91%

“…In general, Ca, Mg and P are the major mineral constituents of slim teas. Concentrations of (Chen et al 2009;Malik et al 2008;Nookabkaew et al 2006;Szymczycha-Madeja et al 2013), indicating that the aforementioned elements are the most abundant in many herbal medicines and teas. 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.…”

Section: Slim Teasmentioning

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%

“…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: −1supporting

confidence: 91%

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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“…31,32 As concentrações obtidas para Ca, Cu, Fe, Mg, Mn e Zn nos chás variaram de 0,3-2,4%; 0,55-2,1 μg g 28 Vale ressaltar que neste estudo foi usado apenas 1,0 g de planta seca para 25 mL de água desionizada para fins experimentais. Sendo assim, pode-se estimar que em uma xícara de chá (200 mL) a população amazônica pode consumir cerca de 4,0 a 8,0 g de folha seca por dia.…”

Section: Encontrados Nos Digeridos De Insulina (Ind) Peão Branco (Peunclassified

Classificação multivariada de ervas medicinais da Região Amazônica e suas infusões de acordo com sua composição mineral

Diniz¹,

Filho²,

Müller³

et al. 2013

Quím. Nova

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Recebido em 19/5/12; aceito em 17/8/12; publicado na web em 23/1/13 MULTIVARIATE CLASSIFICATION OF MEDICINAL HERBS FROM THE AMAZON REGION AND THEIR INFUSIONS ACCORDING TO THEIR MINERAL COMPOSITION. In this study, the mineral composition of leaves and teas of medicinal plants was evaluated. Ca, Cu, Fe, Mg, Mn e Zn were determined in the samples using flame atomic absorption spectrometry. Principal component analysis was applied to discriminate the samples studied. The samples were divided within the 2 groups according to their mineral composition. Copper and iron were the variables that contributed most to the separation of the samples followed by Ca, Mg, Mn and Zn. The information in the principal component analysis was confirmed by the dendrogram obtained by hierarchical cluster analysis.Keywords: medicinal plants; multivariate analysis; FAAS. INTRODUÇÃOA utilização de ervas medicinais é uma prática muito comum e bastante difundida em várias partes do mundo. As ervas são coletadas nas florestas ou quintais residenciais e podem ser comercializadas em feiras livres, supermercados, farmácias de manipulação ou em lojas especializadas. O tratamento com ervas medicinais apresenta-se como uma alternativa ao tratamento da medicina convencional e pode utilizar várias partes das plantas como raiz, caule, folha, flores, frutos ou sementes dependendo da espécie vegetal. A forma de preparação também pode ser variada, porém, a mais utilizada é a infusão (chá), que se apresenta como uma das bebidas mais consumidas no mundo, seja pelo sabor agradável, seja por seu potencial terapêutico que auxilia a cura de doenças.1-3 Não há um rigor, por parte dos consumidores, na preparação e na utilização das infusões (chás) de plantas medicinais, uma vez que sua preparação e sua indicação na maioria das vezes é herança de antigas culturas. Além disso, a maioria das ervas medicinais encontradas na região amazônica não possui as suas propriedades bem estudadas.A Amazônia possui uma flora bastante variada. A utilização de ervas medicinais é bastante antiga na região amazônica, herança de tribos indígenas que habitavam na região e repassaram as suas tradições, contribuindo assim para o uso das ervas pela população no tratamento de doenças.Nos últimos anos tem surgido uma grande preocupação em se conhecer a composição das ervas medicinais, visto que muitas delas são indicadas para as mais diversas enfermidades que acometem o homem. Muitas pessoas ainda utilizam ervas ou preparados medicinais como primeiro recurso terapêutico no tratamento de enfermidades. 4,5 Um grande interesse vem sendo dado ao estudo de constituintes inorgânicos presentes em alimentos, bebidas e fitoterápicos, porque estes elementos podem auxiliar no metabolismo ou, dependendo da sua concentração, podem ser prejudiciais à saúde do homem. 6,7 O estudo da composição mineral nas plantas medicinais tem se mostrado bastante relevante, uma vez que as plantas podem ser uma fonte alternativa de minerais necessários para manter a saúde do corpo.8 Os constituintes inorgânicos estão e...

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Trace Elements and Plant Secondary Metabolism: Quality and Efficacy of Herbal Products

Poschenrieder

Allué

Tolrà

et al. 2008

Trace Elements as Contaminants and Nutrients

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Determination of Trace Elements in Herbal Tea Products and Their Infusions Consumed in Thailand

Cited by 193 publications

References 33 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

Classificação multivariada de ervas medicinais da Região Amazônica e suas infusões de acordo com sua composição mineral

Trace Elements and Plant Secondary Metabolism: Quality and Efficacy of Herbal Products

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