Takeda Chemical Industries, Inc.

Takeda Chemical Ind., Ltd.

Ko Imai

Yoshio Kamatani

Hisayoshi Okazaki

Yoshio Yamazaki

Noriaki Fujita

Katsuhiko Ogino

Ikuo Nogami

Takeshi Sakane

2-Keto-L-gulonic acid is produced in a high yield by contacting L-sorbose with a microorganism of Pseudomonas sorbosoxidans, or a processed material thereof.

Biologically pure cultures of Pseudomonas sorbosoxidans useful for

Method for producing 2-keto-L-gulonic acid

Calcium cis-epoxysuccinate whose average particle size is not larger than 100 micron is converted into calcium L(+)-tartarate by a microorganism in a high concentration and in a better yield. This process is accelerated in the presence of a nonionic type surfactant of the medium.

Method for producing L(+)-tartaric acid

Calcium cis-epoxysuccinate is converted into calcium L(+)-tartarate by a microorganism in a high concentration and is a better yield. This process is accelerated in the presence of a nonionic type surfactant of the medium.

Production of L(+)-tartaric acid

L(+)-tartaric acid is produced in a high efficiency from cis-epoxysuccinic acid by a microorganism belonging to the genus Pseudomonas, Agrobacterium or Rhizobium.

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Osaka, Japan

Ko Imai