Evidence map›Paper›PMID 37923855›Full record

ArticlePlant foods for human nutrition (Dordrecht, Netherlands)2023

Catechin Composition, Phenolic Content, and Antioxidant Properties of Commercially-Available Bagged, Gunpowder, and Matcha Green Teas.

Bailey R Meyer, Haley M White, Jared D McCormack, Emily D Niemeyer

Abstract read
In one paragraph

Article in Plant foods for human nutrition (Dordrecht, Netherlands), 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 22 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
22citing papers in PubMed, 1 pooled it
–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

22 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
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  12. Article
  13. Hydrogen Peroxide: A Ubiquitous Component of Beverages and Food.International journal of molecular sciences · 2025
    Review
  14. Article
  15. Article
  16. Exploring the Therapeutic Potential of Green Tea (Mini reviews in medicinal chemistry · 2025
    Review
  17. Article
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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

4 authors.

Bailey R MeyerDepartment of Chemistry and Biochemistry, Southwestern University, 1001 E. University Ave, Georgetown, TX, 78626, USA.
Haley M WhiteDepartment of Chemistry and Biochemistry, Southwestern University, 1001 E. University Ave, Georgetown, TX, 78626, USA.
Jared D McCormackDepartment of Chemistry and Biochemistry, Southwestern University, 1001 E. University Ave, Georgetown, TX, 78626, USA.
Emily D NiemeyerDepartment of Chemistry and Biochemistry, Southwestern University, 1001 E. University Ave, Georgetown, TX, 78626, USA. niemeyee@southwestern.edu.

Funding

Southwestern University Herbert and Kate Dishman fundWelch Foundation AF-0005
6 · The paper itself

Abstract

The leaves of the Camellia sinensis plant are used to produce many different types of teas, and green tea is particularly noted for its health promoting properties which are attributed to high concentrations of phenolic compounds known as catechins. Green tea is available in forms such as bagged, gunpowder (rolled leaf), and matcha, a fine powder. This study evaluated the phenolic content, catechin composition, caffeine concentration, and antioxidant properties of fifteen commercially-available green teas with an emphasis on identifying differences between ceremonial and culinary matcha. Gunpowder and bagged green teas had higher total phenolic contents and greater CUPRAC (cupric ion reducing antioxidant capacity) and ORAC (oxygen radical absorbance capacity) antioxidant capacities than matcha teas. Among matcha samples, less expensive culinary teas had greater total phenolic contents and higher antioxidant capacities than ceremonial products. Hierarchical cluster analysis was used to determine similarities and differences in catechin composition and revealed that bagged and gunpowder green teas had the highest levels of the stereoisomers epi/catechin gallate, which correlated with their strong antioxidant properties. Bagged and gunpowder teas were the lowest cost products in this study, indicating that they are an economical choice for consumers who want a green tea beverage with high catechin content, although they generally had lower caffeine levels than matcha.

Indexed as

Camellia sinensisCatechinAntioxidantsCaffeinePhenolsPlant ExtractsTeaAntioxidantsCaffeineCatechinPhenolsPlant ExtractsTeaAntioxidant propertiesCamellia sinensisCatechin contentGreen teaMatcha

Identifiers

PMID37923855
PMCPMC10665233

What OpenQuestion holds

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Registered trials

None linked

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.