{"id":1177,"date":"2026-02-23T21:38:58","date_gmt":"2026-02-23T12:38:58","guid":{"rendered":"http:\/\/agriture.jp\/?post_type=news&p=1177"},"modified":"2026-04-22T19:53:26","modified_gmt":"2026-04-22T10:53:26","slug":"chestnut-powder","status":"publish","type":"news","link":"https:\/\/agriture.jp\/en\/news\/chestnut-powder\/","title":{"rendered":"We Prototyped \"Chestnut Skin Powder\" Using Domestically Grown Chestnut Skins"},"content":{"rendered":"

Agriture prototyped a \"chestnut skin powder\" made from domestically grown chestnut skins.
Chestnut skins have long been a by-product often discarded during food processing, but they're drawing attention as a sustainable material. In particular, chestnut inner and outer skins are rich in polyphenols and tannins, and they're seen as promising functional materials with antioxidant activity.<\/p>

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For this prototype, we carefully washed and dried domestic chestnut skins and finished them into a fine powder. Made without additives, glucose-free and uncolored, it features the material's own toasty aroma and pale brown color. By drawing on the chestnut's own aroma and deep, rich taste, it can be applied to a wide range of products\u2014baked goods, bread, smoothies, tea, and more.<\/p>

Chestnut skin is also rich in dietary fiber, making it suitable for health-oriented product development. It has particularly high affinity with development themed around the currently trending \"upcycled food\" and \"domestic functional materials,\" and OEM inquiries from food manufacturers, confectioners, and beverage companies are increasing.<\/p>

Agriture handles everything from material sourcing through drying, powdering, and OEM manufacturing in-house. If your company is considering product-making that draws on domestic materials such as chestnuts, please feel free to inquire.<\/p>

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Features of chestnut skin powder and component insights<\/h2>

Chestnut skin powder is made by drying and grinding the inner and outer skins that come out as by-products during chestnut processing. As an \"upcycled food\" that powders parts usually discarded, it's drawing attention in product development in the context of food-loss reduction and the SDGs. The inner skin contains polyphenols (tannins) and dietary fiber, and it features a distinctive flavor with a mild bitterness and astringency. Since content varies with the chestnut's variety and origin, we recommend confirming the flavor of the lot at the prototype stage. For detailed specs, seethe chestnut skin powder product page<\/a>.<\/p>

Difference from chestnut kernel powder<\/h3>

Chestnut skin powder differs from powder made from the chestnut kernel (edible part) in both application and flavor design. When comparing at the development stage, use the table below as a guide (figures vary with variety and processing conditions).<\/p>

Item<\/th>Chestnut skin powder (inner and outer skins)<\/th>Chestnut kernel powder (edible part)<\/th><\/tr><\/thead>
Key component insights<\/td>Polyphenols (tannins), dietary fiber<\/td>Starch, carbohydrate, vitamin C<\/td><\/tr>
Flavor<\/td>Mild bitterness, astringency, woody aroma<\/td>Sweetness, chestnut-like flavor<\/td><\/tr>
Main use<\/td>Baked goods, tea, bread, cereal bars<\/td>Mont Blanc, kurikinton, paste<\/td><\/tr>
Upcycling nature<\/td>Excellent (effective use of a discarded part)<\/td>Fair (uses the edible part as is)<\/td><\/tr>
Color<\/td>Brown to deep brown<\/td>Pale beige to yellow<\/td><\/tr><\/tbody><\/table><\/figure>

The tannins in chestnut skin are perceived as astringency, so the blend ratio and balance with other materials are key to product design. Designs that combine it with materials compatible with bitterness and astringency\u2014such as chocolate or coffee\u2014are common.<\/p>

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You can check the details of turnip's powder form on the<\/div><\/figure>
Chestnut skin powder is an upcycled material that \"turns a once-discarded part into a product.\" It has high affinity with product plans themed around the SDGs and food-loss reduction, and it's a material whose story is easy to convey on the package. Since the strength of astringency varies by lot, we recommend a sensory evaluation of the blend ratio at the prototype stage.<\/div> <\/div> <\/span><\/span><\/span><\/div><\/div><\/div><\/div>

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Chestnut skin powder can be used in product design from both angles: the functionality of \"polyphenols and dietary fiber\" and the story of \"upcycling.\" Here are representative ideas by application.<\/p>

Baked goods, bakery<\/h3>

Chestnut skin powder's mild bitterness and woody aroma pair excellently with chocolate-based baked goods and bread. Kneading 2\u20135% into financier, galette, or brownie dough adds a deep, grown-up flavor. Combining it with candied inner-skin chestnuts or marron paste for \"all-chestnut sweets\" is also used in prototypes.<\/p>