Properties and Shapes of Matcha with Various Milling Method

Sawamura, Shin-ichi; Haraguchi, Yasuhiro; Ikeda, Hiroko; Sonoda, Junko

doi:10.3136/nskkk.57.304

Cited by 10 publications

(7 citation statements)

References 4 publications

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“…The mean particle size of Matcha green tea, which is commonly used, was reported to be approximately 20 lm (Haraguchi et al 2003;Sawamura et al 2010). However, in this study the ester-type catechin plasma level was higher in the BGP 2.86 lm group than in the infusion or larger particle size groups.…”

Section: Discussioncontrasting

confidence: 82%

Effect of green tea powder (Camellia sinensis L. cv. Benifuuki) particle size on O-methylated EGCG absorption in rats; The Kakegawa Study

et al. 2011

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Tea polyphenols, e.g., (-)-epigallocatechin-3-O-(3-O-methyl gallate (EGCG3"Me), (-)-epigallocatechin-3-O-gallate (EGCG), (-)-epigallocatechin (EGC), (-)-epicatechin-3-O-gallate (ECG), and (-)-epicatechin (EC), are believed to be responsible for the beneficial effects of tea. 'Benifuuki', a tea (Camellia sinensis L.) cultivar grown in Japan, is rich in the anti-allergic molecule epigallocatechin-3-O-(3-O-methyl) gallate (EGCG3"Me). Pulverized Benifuuki green tea powder (BGP) is more widely distributed than leaf tea in Japan. Japanese people mix their pulverized tea with water directly, whereas it is common to drink leaf tea after extraction. However, few studies of the effects of BGP particle size on polyphenol bioavailability have been performed. This study was conducted to investigate the absorption of catechins in rats after the intragastric administration of Benifuuki green tea. Therefore, we assessed the plasma concentrations of catechins following the ingestion of BGP with different mean particle sizes (2.86, 18.6, and 76.1 μm) or Benifuuki green tea infusion (BGI) as a control in rats. The bioavailabilities of EGCG3"Me, EGCG, ECG, EGC, and EC were analyzed after the oral administration of a single dose of Benifuuki green tea (125 mg/rat) to rats. The plasma concentrations of tea catechins were determined by HPLC analysis combined with of electrochemical detection (ECD) using a coulometric array. The AUC (area under the drug concentration versus time curve; min μg/mL) of ester-type catechins (EGCG3"Me, EGCG, and ECG) for the BGP 2.86 μm were significantly higher than those in the infusion and 18.6 and 76.1 μm BGP groups, but the AUC of free-type catechins (EGC and EC) showed no differences between these groups. Regarding the peak plasma level of EGCG3"Me adjusted for intake, BGP 2.86 μm and BGI showed higher values than the BGP 18.6 and 76.1 μm groups, and the peak plasma levels of the other catechins displayed the same tendency. The present study demonstrates that the bioavailability of ester-type catechins (EGCG and ECG) can be improved by reducing the particle size of green tea, but the plasma level of EGCG3"Me in the BGI group was similar to that in the BGP 2.86 μm group. This result suggests that drinking Benifuuki green tea with a particle size of around 2 μm would deliver the anti-allergic EGCG3"Me and the anti-oxidant EGCG efficiently.

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Section: Discussioncontrasting

confidence: 82%

Effect of green tea powder (Camellia sinensis L. cv. Benifuuki) particle size on O-methylated EGCG absorption in rats; The Kakegawa Study

et al. 2011

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“…In contrast, when powdered with a ceramic mill, ball mill, or mixer, many leaves were miniaturized into particles of less than 100 µm. Furthermore, the use of a ceramic mill, which is characterized by a strong shearing force [20], resulted in particles with torn shapes in comparison to other methods.…”

Section: Resultsmentioning

confidence: 99%

“…Comparison of the powdering process revealed that the ceramic mill produced the smallest tea particles. A previous report from Sawamura et al [20] indicated that a set of millstones had higher shearing force and produced lower roundness of particles than a jet mill. In line with Sawamura’s study, our results, using Scanning Electron Microscope (SEM) images of green tea powder derived by a ceramic mill, confirm the predominant presence of torn structures rather than other methods (Figure 1).…”

Section: Discussionmentioning

confidence: 99%

“…Studies on the physical properties of matcha have revealed differences in particle sizes, shapes, and foaming properties as the result of diverse powdering methods. Onishi et al [19] reported matcha particles of several micrometers by using electron microscopy, while Sawamura et al reported median diameters of 15–20 µm (millstone and ball mill), or ≤5 µm (jet mill) using laser diffraction analysis [20,21].…”

Section: Introductionmentioning

confidence: 99%

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The Powdering Process with a Set of Ceramic Mills for Green Tea Promoted Catechin Extraction and the ROS Inhibition Effect

Fujioka

Iwamoto

Shima³

et al. 2016

Molecules

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For serving green tea, there are two prominent methods: steeping the leaf or the powdered leaf (matcha style) in hot water. The purpose of the present study was to reveal chemical and functional differences before and after the powdering process of green tea leaf, since powdered green tea may contribute to expanding the functionality because of the different ingesting style. In this study, we revealed that the powdering process with a ceramic mill and stirring in hot water increased the average extracted concentration of epigallocatechin gallate (EGCG) by more than three times compared with that in leaf tea using high-performance liquid chromatography (HPLC) and liquid chromatography-tandem mass Spectrometry (LC-MS/MS) analyses. Moreover, powdered green tea has a higher inhibition effect of reactive oxygen species (ROS) production in vitro compared with the same amount of leaf tea. Our data suggest that powdered green tea might have a different function from leaf tea due to the higher catechin contents and particles.

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“…There are reported studies on green tea powder related to milling methods, particle characteristics (Haraguchi et al, 2003;Sawamura et al, 2009;Sawamurai et al, 2010), and foaming properties (Maeda et al, 1999;Sawamura et al, 2012). Catechin contents were also studied in green tea powder (Weiss and Anderton, 2003;Li et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Physicochemical properties of Turkish green tea powder: effects of shooting period, shading, and clone

Topuz

Dinçer²,

Torun³

et al. 2014

Turk J Agric For

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Properties and Shapes of Matcha with Various Milling Method

Cited by 10 publications

References 4 publications

Effect of green tea powder (Camellia sinensis L. cv. Benifuuki) particle size on O-methylated EGCG absorption in rats; The Kakegawa Study

Effect of green tea powder (Camellia sinensis L. cv. Benifuuki) particle size on O-methylated EGCG absorption in rats; The Kakegawa Study

The Powdering Process with a Set of Ceramic Mills for Green Tea Promoted Catechin Extraction and the ROS Inhibition Effect

Physicochemical properties of Turkish green tea powder: effects of shooting period, shading, and clone

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