When people hear “Japanese matcha,” many immediately think of Kyoto or Uji. Uji matcha is highly respected, and there are many premium Uji matcha products for tea ceremony, connoisseurs, and high-end use.
Sanrokuen does not claim that Kumamoto matcha is superior to Uji matcha as a whole. Instead, this page looks at one practical question: what does component analysis suggest about the quality potential of Kumamoto first-flush matcha material?
Why component analysis matters for matcha
Matcha quality is not determined by one number. Color, aroma, cultivar character, firing, milling, particle size, freshness, preparation and intended use all matter.
Still, component analysis can provide useful objective clues. Total nitrogen, free amino acids and theanine are often associated with umami and richness, while tannin is related to astringency and bitterness. For business buyers, these values can help compare raw material potential beyond brand name alone.
This is especially useful for matcha used in cafés, lattes, desserts, food service and overseas retail, where quality must be balanced with color, flavor strength, powder quality, price and stable supply.
Samples and testing conditions
Kumamoto first-flush matcha material
The Kumamoto values shown here are median values calculated from component analysis results of first-flush material used for Sanrokuen’s Kumamoto matcha products, including Hatsugami no Shiro and Kikuchi Enju.
- Origin: Kumamoto Prefecture, Japan
- Harvest season: first flush
- Used for: Hatsugami no Shiro and Kikuchi Enju
- Testing institution: JA Kumamoto Keizairen
- Testing date: May 14, 2026
- Displayed values: median values from the tested raw material lots
Commercial matcha sample A
The comparison sample was a commercial matcha sold by a Kyoto/Uji tea shop. It is the type of matcha commonly used for tea ceremony practice and everyday usucha, rather than a high-end ceremonial grade.
This distinction is important. Uji has many premium matcha products for serious tea ceremony and luxury use. The comparison below is not a comparison against the highest-grade Uji matcha. It is a reference comparison with one commercially available practice-use matcha sample.
- Label in this page: Commercial matcha sample A
- Raw material label: green tea, Japan
- Package size: 30g
- Purchase price: 1,404 yen
- Testing institution: JA Kumamoto Keizairen
- Testing date: June 15, 2026
Component analysis results
The table below compares the median values of Kumamoto first-flush matcha material with the commercial matcha sample A.
| Measurement item | Kumamoto first-flush material median | Commercial matcha sample A | Result for Kumamoto material |
|---|---|---|---|
| Moisture | 3.68% | 4.1% | About 10% lower |
| Total nitrogen | 6.44% | 5.2% | About 24% higher |
| Free amino acids | 5.18% | 2.8% | About 85% higher |
| Theanine | 2.98% | 2.0% | About 49% higher |
| Fiber | 20.66% | 21.2% | About 3% lower |
| Tannin | 7.02% | 8.0% | About 12% lower |
| Caffeine | 2.38% | 2.5% | About 5% lower |
| Vitamin C | 0.388% | 0.05% | About 7.8 times |
| AF score | 75.2 | 32 | About 2.35 times |
Comparison rates are approximate values calculated from the displayed measurements. The Kumamoto side is raw material used for Sanrokuen products, while sample A is a finished commercial matcha product.
What the numbers suggest
Free amino acids were about 1.85 times higher
Free amino acids are important components related to umami and sweetness in tea. The Kumamoto first-flush material median was 5.18%, while the commercial matcha sample A was 2.8%. In this test, the Kumamoto material showed about 1.85 times higher free amino acids.
Theanine was about 49% higher
Theanine is an amino acid closely associated with the mellow umami taste of green tea. The Kumamoto material showed 2.98% theanine, while sample A showed 2.0%.
Sanrokuen’s Kumamoto matcha uses first-flush material selected for matcha use, including cultivars and shading conditions suitable for producing rich taste. These factors may have contributed to the higher theanine value.
Tannin was about 12% lower
Tannin is related to astringency and bitterness in tea. The Kumamoto material showed 7.02%, while sample A showed 8.0%. In this test, the Kumamoto material had about 12% lower tannin.
Total nitrogen was 6.44%
Total nitrogen is one of the indicators used when evaluating tea leaf quality and richness. The Kumamoto first-flush material showed 6.44%, compared with 5.2% for sample A.
AF score was 75.2
AF score is an index based on the balance between free amino acids and fiber. The Kumamoto material showed an AF score of 75.2, compared with 32 for sample A.
AF score alone cannot determine the overall taste or aroma of matcha. However, it can be a useful reference for understanding leaf youthfulness and the balance between umami-related components and fiber.
The result does not prove that Kumamoto matcha is superior to Uji matcha. It shows that Kumamoto first-flush matcha material has strong measurable potential.
Important limits of this comparison
This comparison should be read carefully. It is not a ranking of all Kumamoto matcha and all Uji matcha.
Uji has many high-end matcha products for tea ceremony, including products far above ordinary practice-use grades. This page compares Kumamoto first-flush raw material used for Sanrokuen products with one commercial matcha sample commonly used for tea ceremony practice.
Matcha quality is affected by many factors: cultivar, leaf color, aroma, firing, milling method, particle size, storage condition, freshness and preparation method. Component values alone do not determine whether one matcha tastes better than another.
In addition, the Kumamoto side is raw material used for Sanrokuen products, while the comparison sample is a finished commercial matcha product. The results should therefore be viewed as reference data for understanding component characteristics, not as a universal conclusion.
Sanrokuen tests every first-flush Kumamoto matcha lot
Sanrokuen conducts component testing on every first-flush raw material lot used for its Kumamoto matcha products. We check not only color, aroma and actual taste, but also:
- Total nitrogen
- Free amino acids
- Theanine
- Tannin
- Fiber
- Caffeine
- Vitamin C
- AF score
Our goal is not to sell a product simply because it is from Kumamoto. Our approach is to select material that we can trust from both a sensory and analytical perspective.
Conclusion: data supports the potential of Kumamoto matcha
In this comparison, Kumamoto first-flush matcha material showed higher free amino acids, theanine and total nitrogen than the tested commercial matcha sample A, while tannin was lower. AF score was also higher.
These results suggest that Kumamoto first-flush matcha material can have strong potential for umami-rich, low-astringency matcha production. However, they should not be interpreted as a claim that Kumamoto matcha is superior to Uji matcha as a whole.
For cafés, lattes, desserts, food service and overseas buyers looking for Japanese matcha beyond famous origins, Kumamoto matcha is worth watching — especially when the material is selected through both component analysis and actual taste evaluation.
From component data to a practical product choice
Component analysis can indicate raw-material potential, but it does not identify the best product for every use. A smooth first-flush matcha for drinking and a stronger matcha for milk, desserts or baking may require different balance, particle size and price.
The practical next step is therefore to compare the available grades by intended use, not to select a product from one analytical number. Our wholesale page lists purpose-based grades, reference EXW prices and export notes.
Component values do not explain powder texture
Theanine, amino acids and tannin help explain the potential flavor of the raw material, but they do not show how smooth the finished powder will feel or how many coarse particles remain.
Sanrokuen therefore also measures particle-size distribution. In a same-material comparison, cyclone milling produced a D50 of approximately 9.6–10.3 μm, compared with 18.3 μm for ball milling. The comparison page explains D50, D90, smoothness, foam and intended use.
Compare grades only after reviewing the data
The wholesale page explains which grades are intended for drinking, lattes, desserts and food processing, together with reference prices and export conditions. The analysis above applies to selected first-flush material and should not be assumed to represent every business-use grade.
Sources and references
- Sanrokuen Japanese article: Component comparison of Kumamoto matcha material and a commercial Uji-style practice matcha sample.
- Tea component and quality material: total nitrogen, free amino acids, theanine and tea quality.
- J-STAGE study: relationship between tea cultivars and components such as total nitrogen, free amino acids, theanine, tannin, caffeine and vitamin C.
- Sanrokuen: Kumamoto Matcha as a new alternative as Japanese matcha prices rise.