Evidence map›Paper›PMID 26899031›Full record

ArticleEnvironmental monitoring and assessment2016

Monitoring of essential and heavy metals in green tea from different geographical origins.

Justyna Brzezicha-Cirocka, Małgorzata Grembecka, Piotr Szefer

Abstract read
In one paragraph

Article in Environmental monitoring and assessment, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 36 papers.

0numbers the graph read from it
0cells of the map it votes in
36citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

36 citing papers in PubMed.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors.

Justyna Brzezicha-CirockaDepartment of Food Sciences, Medical University of Gdansk, Al. Gen. J. Hallera 107, Gdansk, 80-416, Poland.
Małgorzata GrembeckaDepartment of Food Sciences, Medical University of Gdansk, Al. Gen. J. Hallera 107, Gdansk, 80-416, Poland. mgrembecka@gumed.edu.pl.
Piotr SzeferDepartment of Food Sciences, Medical University of Gdansk, Al. Gen. J. Hallera 107, Gdansk, 80-416, Poland.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The present study measured the concentrations of toxic metals (Cd, Pb) and other elements (Ca, K, Mg, Na, P, Mn, Fe, Zn, Cu, Co, Cr, Ni) in tea leaves and their infusions. The total metal contents were determined by atomic absorption spectrometry. Phosphorus concentration was determined using an ultraviolet-visible spectrophotometer. Assessment of the mineral composition enabled determination of the leaching percentage and the risk of exceeding provisional tolerable weekly intake for Cd through daily tea consumption. The concentrations of bioelements were analyzed based on the recommended daily intake values for each. According to recently established standards, green tea was found to be a rich source of Mn. The average Pb and Cd levels in a 200-mL beverage were 0.002 and 0.003 mg, respectively. Indian teas had the highest percentage of Cd leaching (43.8%) and Chinese tea had the lowest (9.41%). Multivariate analysis techniques such as factor analysis and cluster analysis were used to differentiate samples according to geographical origin (China, India, or Japan). Potassium, P, Mn, Fe, Cu, Co, and Cd were effective descriptors for the identification of tea samples from China, India, and Japan.

Indexed as

Environmental MonitoringChinaFood ContaminationHumansIndiaJapanMetalsMetals, HeavyMineralsMultivariate AnalysisSoil PollutantsSpectrophotometry, AtomicTeaMetalsMetals, HeavyMineralsSoil PollutantsTeaCluster analysisFactor analysisGreen teaHeavy metalsPTWI

Identifiers

PMID26899031
PMCPMC4762913

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.