Determination of the Elemental Composition of Coffee Using Instrumental Methods

Pohl, Paweł; Stelmach, Ewelina; Wełna, Maja; Szymczycha‐Madeja, Anna

doi:10.1007/s12161-012-9467-6

Cited by 80 publications

(61 citation statements)

References 49 publications

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“…It is recognized as a rich source of elements, including essential as well as toxic, that the coffee plant may take up from a polluted soil, fertilizers or water and air contaminations. A concise review concerning the elemental analysis of coffee has been presented very recently by Pohl et al (Pohl et al 2013). Because of the ease of use and cleanliness of the preparation, soluble/instant coffee enjoys popularity (Vega-Carrillo et al 2002;Oliveira et al 2012) and today, an interest in the consumption of specific soluble coffees as slim coffees, can be observed.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of Determination of Trace Amounts of Arsenic and Selenium in Slim Coffee Products by HG-ICP-OES

2013

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A method for the determination of total inorganic arsenic and selenium in slim instant coffees using hydride generation inductively coupled plasma optical emission spectrometry (HG-ICP-OES) was proposed. Various sample preparation procedures, including the traditional total decomposition by the hot-plate or microwave heating in a HNO 3 /H 2 O 2 mixture and alternative procedures based on the solubilisation in aqua regia or tetramethyl ammonium hydroxide (TMAH) and the dilution only with water or a low concentrated HNO 3 solution were examined and compared. Corresponding As and Se hydrides were generated in the reaction of an acidified sample solution with the NaBH 4 reductant in the presence of antifoam A. A small sample preparation with aqua regia in an ultrasonic bath followed by the pre-reduction with KI-ascorbic acid in the HCl medium for total As and the boiling with HCl for total Se were found to be optimal. The external calibration using standards treated and measured as the same as samples were applied for the analysis. Limits of detection (LODs) of 0.96 and 0.55 ng ml −1 were assessed for As and Se, respectively. The precision (as the relative standard deviation [RSD]) was within 1.6-7.1 %. The accuracy of the method was confirmed by the recovery test and the analysis of a standard reference material (non-fat milk powder, SRM 1459). The developed procedure was applied for the analysis of six commercial instant slim coffee products available in the Polish market and it was found that these products contain traces of As (0.114-0.247 μg g −1 ) and Se (0.089-0.137 μg g −1 ).

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Section: Introductionmentioning

confidence: 99%

“…Studies concerning Se and As in soluble coffee are rather scarcely documented than those devoted to other elements (Pohl et al 2013). Accordingly, there have been only few reports on the concentration of aforementioned elements (Vega-Carrillo et al 2002; Jose dos Santos and de Oliveira 2001;Ribeiro et al 2003;Asfaw and Wibetoe 2005).…”

Section: Introductionmentioning

confidence: 99%

Improvement of Determination of Trace Amounts of Arsenic and Selenium in Slim Coffee Products by HG-ICP-OES

2013

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“…In general, the elemental analysis of ground coffee infusions is rare (Pohl et al 2013). In case of FAAS measurements, portions of infusions are commonly evaporated to the near dryness, while remaining residues are ashed and reconstituted in a HCl solution (Grembecka et al 2007) or digested in a mixture of concentrated HNO 3 and HClO 4 solutions (Ashu and Chandravanshi 2011).…”

Section: Suitability Of Different Pretreatments Of Coffee Infusionsmentioning

confidence: 99%

“…Commercial and social importance of coffee is obvious and therefore great awareness and concern to the elemental composition of this beverage is attached (Pohl et al 2013). The information on the total concentration of minerals, micronutrients, or trace elements in coffee is commonly used to assess its quality and safety or differentiate types of this beverage (Dos Santos et al 2010;Bertrand et al 2008;Filho et al 2007;Grembecka et al 2007;Fernandes et al 2005;Dos Santos and de Oliveira 2001;Martin et al 1996Martin et al , 1999Onianwa et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Determination of Total Concentrations and Chemical and Physical Fractionation Forms of Manganese in Infusions of Ground Coffees

2013

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A simple and fast method of the determination of total Mn in infusions of ground coffees was proposed and included the acidification of infusions with HNO 3 followed by the analysis by flame atomic absorption spectrometry. The method provided the precision and the accuracy better than 3 %. In addition, chemical and physical fractionation patterns of Mn in coffee infusions were assessed using solid phase extraction and ultrafiltration-based procedures, respectively. It was found that Mn in infusions of ground coffees is predominantly present in the form of cationic (64-81 % of the total content) low molecular weight (61-68 % of the total content) species. This points out that this metal is highly bioaccessible from the coffee brew.

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“…Dos Santos et al [27] have evaluated some metals in Brazilian coffees cultivated during the process of conversion from conventional to organic agriculture. Pohl et al [28] have described different techniques for the determination of the elemental composition of coffee. Nędzarek et al [29] have reported the concentrations of six heavy metals (Mn, Co, Ni, Cr, Ag, Pb) in coffee infusions from eleven samples, roasted and purchased in four countries: Bosnia and Herzegovina, Brazil, Lebanon and Poland.…”

Section: Introductionmentioning

confidence: 99%

Assessment of metals in roasted indigenous coffee varieties of Ethiopia

Gure¹,

Chandravanshi²,

Godeto³

2018

Bull. Chem. Soc. Eth.

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ABSTRACT. The metals content (Ca, Cd, Cr, Co, Cu, Fe, K, Mg, Mn, Ni, Pb and Zn) of roasted coffee varieties grown in five different regions of Ethiopia was determined by flame atomic absorption spectrometry. Representative samples were collected from Coffee Quality Inspection and Liquoring Center in the capital city, Addis Ababa, Ethiopia and the metals were extracted by wet digestion. The optimal digestion required 4 hours refluxing at 270 o C on Kjeldhal hot plate with a mixture of 5 mL HNO3 (70%) and 1.5 mL HClO4 (70%) to completely digest 0.5 g of roasted coffee samples. Recoveries of metals in the spiked samples varied from 90 to 110%. Analysis of variance revealed significant differences in the concentrations of Ca, Co, Cu, Mn, Cr, Ni and Zn with the variation of coffee beans geographic origin. Pearson correlation coefficients indicated high positive correlation among some metals and high negative correlation among others. The amounts of metals that a person can get from two cups of coffee are well below the daily recommended values and drinking two cups of coffee is safe for an adult person and free from the risks of Cd and Pb toxicity.

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Determination of the Elemental Composition of Coffee Using Instrumental Methods

Cited by 80 publications

References 49 publications

Improvement of Determination of Trace Amounts of Arsenic and Selenium in Slim Coffee Products by HG-ICP-OES

Improvement of Determination of Trace Amounts of Arsenic and Selenium in Slim Coffee Products by HG-ICP-OES

Determination of Total Concentrations and Chemical and Physical Fractionation Forms of Manganese in Infusions of Ground Coffees

Assessment of metals in roasted indigenous coffee varieties of Ethiopia

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