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Comparative assessment of the quality of commercial black and green tea using microbiology analyses

Overview of attention for article published in BMC Microbiology, January 2018
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Comparative assessment of the quality of commercial black and green tea using microbiology analyses
Published in
BMC Microbiology, January 2018
DOI 10.1186/s12866-017-1142-z
Pubmed ID

Federica Carraturo, Olga De Castro, Jacopo Troisi, Adriana De Luca, Armando Masucci, Paola Cennamo, Marco Trifuoggi, Francesco Aliberti, Marco Guida


Drinking tea constitutes a tradition which is deeply rooted in the culture of several countries. Moreover, in recent years, tea consumption is growing all over the world. Improper herbal tea storage (long periods, humid environments) represents a relevant health hazard for consumers because of the growth of bacteria and molds. This study analyzed 32 samples of commercially available black and green teas - purchased from southern Italy markets and online-shops - and the monitoring of microbiological quality of the tea bag content was performed. Evaluations were conducted with the aim of characterizing pathogens indicated by the European and American guidelines (total bacterial count, fungi and Escherichia coli) and on the research of Pseudomonas spp. and Clostridium perfringens. The presence of ochratoxin A in tea matrix-leaves and infusions was further assessed, using a validated and accredited HPLC-FLD method. Microbial loads, for over 80% samples, ranged from 1.0 × 102 to 2.8 × 105 CFU/g tea: most of identified microorganisms were classified as Bacillaceae. The utilization of rapid detection and identification methods (PCR and sequencing), allowed the characterization of strains of Pseudomonas psychrotolerans, Staphylococcus warneri, Pantoea gaviniae and the isolation of one strain of Clostridium perfringens, whose ability to produce toxins can result in harmful outcomes for consumers. Fungi were isolated from 70% samples: the most prevalent molds were Aspergillus niger strains, followed by Aspergillus tubingensis. Ochratoxin A was detected in 22 of 32 tea solid samples investigated: concentrations resulted over the indicated limits for food products for 50% samples. Results obtained demonstrated the need to develop targeted regulations for the safety of herbal teas.

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Mendeley readers

The data shown below were compiled from readership statistics for 84 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 84 100%

Demographic breakdown

Readers by professional status Count As %
Student > Bachelor 23 27%
Student > Ph. D. Student 7 8%
Student > Master 7 8%
Researcher 5 6%
Student > Doctoral Student 3 4%
Other 8 10%
Unknown 31 37%
Readers by discipline Count As %
Agricultural and Biological Sciences 12 14%
Biochemistry, Genetics and Molecular Biology 8 10%
Medicine and Dentistry 5 6%
Nursing and Health Professions 4 5%
Pharmacology, Toxicology and Pharmaceutical Science 4 5%
Other 18 21%
Unknown 33 39%

Attention Score in Context

This research output has an Altmetric Attention Score of 2. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 18 December 2020.
All research outputs
of 19,787,208 outputs
Outputs from BMC Microbiology
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Outputs of similar age
of 393,379 outputs
Outputs of similar age from BMC Microbiology
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Altmetric has tracked 19,787,208 research outputs across all sources so far. This one is in the 33rd percentile – i.e., 33% of other outputs scored the same or lower than it.
So far Altmetric has tracked 2,903 research outputs from this source. They receive a mean Attention Score of 3.9. This one is in the 46th percentile – i.e., 46% of its peers scored the same or lower than it.
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