日本語版

CTSD

process / process-kaki-co2-deastringing

炭酸ガス脱渋

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Short definition

A treatment for removing astringency from persimmon fruit by filling a sealed container with high-concentration carbon dioxide gas (about 80–100% in an experimental example). It has been put into practical use as CTSD (CO2 de-astringing); for 'Hiratanenashi', de-astringing is generally described as complete after 1 day of carbon-dioxide treatment plus about 2 days of being kept warm in air.

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How processing and cooking change it (1)

CTSD is defined as CTSD (CO2 de-astringing) conditions for the new cultivar 'Taiten': in 2005, held in air at 25°C for 17 hours, then in 100% carbon dioxide at 27°C for 24 hours, then held in air at 25°C for 120 hours. In 2006, held in air at 26°C for 16 hours, then in 100% carbon dioxide at 27°C for 25 hours, then held in air at 25°C for 120 hours. The control cultivar 'Hiratanenashi' generally completes de-astringing with 1 day of CO2 treatment plus 2 days of holding in air, whereas 'Taiten' requires 6 days for de-astringing and has a longer air-holding period.supported

Note: Yamada et al. (2012), a regional adaptability trial at the NARO Institute of Fruit Tree Science (Akitsu).

「‘太天’については、2005年は25℃の空気中で17時間おいた後、27℃で炭酸ガス100％に24時間おき、その後25℃で空気中に120時間保温した。2006年は26℃の空気中で16時間おいた後、27℃で炭酸ガス100％に25時間おき、25℃で空気中に120時間保温した」「‘平核無’の脱渋(一般に、炭酸ガス処理1日、空気中保温2日)と比べて空気中で保温する期間が長く、脱渋に6日も要する」 (in translation: “For 'Taiten', in 2005 it was held in air at 25°C for 17 hours, then in 100% carbon dioxide at 27°C for 24 hours, then held in air at 25°C for 120 hours. In 2006 it was held in air at 26°C for 16 hours, then in 100% carbon dioxide at 27°C for 25 hours, then held in air at 25°C for 120 hours / compared with the de-astringing of 'Hiratanenashi' (generally 1 day of CO2 treatment and 2 days of holding in air), the air-holding period is longer, and de-astringing takes as long as 6 days.”)
Source: カキ新品種'太天' (山田昌彦; 佐藤明彦; 山根弘康; 三谷宣仁; 岩波宏; 白石美樹夫; 平川信之; 上野俊人; 河野淳; 吉岡美加乃; 中島育子, 2012) · full text checked
Show dataprocess-kaki-co2-deastringing —is_defined_as→ "CTSD (CO2 de-astringing) conditions for the new cultivar 'Taiten': in 2005, held in air at 25°C for 17 hours, then in 100% carbon dioxide at 27°C for 24 hours, then held in air at 25°C for 120 hours. In 2006, held in air at 26°C for 16 hours, then in 100% carbon dioxide at 27°C for 25 hours, then held in air at 25°C for 120 hours. The control cultivar 'Hiratanenashi' generally completes de-astringing with 1 day of CO2 treatment plus 2 days of holding in air, whereas 'Taiten' requires 6 days for de-astringing and has a longer air-holding period."
claim: clm-w40c-taiten-ctsd-protocol / type: processing / updated: 2026-09-02

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