Chiyo Ichikawa

Title: Chiyo Ichikawa: Inventor in Biochemical Processing

Introduction

Chiyo Ichikawa is an inventor associated with Nagoya, Japan, and Fujisawa Pharmaceutical Company, Ltd. Her patent work concerns sorbitol dehydrogenase and its potential use in producing an important intermediate for vitamin C.

Latest Patents

Ichikawa is credited with 1 patent: “Sorbitol dehydrogenase, gene encoding the same and use thereof.” The invention describes a gene encoding D-sorbitol dehydrogenase (SLDH) and a process for producing the enzyme by culturing host cells transformed with an expression vector containing that gene. It also describes using the resulting culture to process L-sorbose or 2-keto-L-gulonic acid (2KLGA). Because 2KLGA is an important intermediate in L-ascorbic acid production, the patent further provides a process for producing L-ascorbic acid from 2KLGA obtained through the described method.

Career Highlights

Ichikawa’s listed patent connects genetic engineering and enzyme production with industrial biochemical processing. The work outlines a route that uses SLDH in processing compounds relevant to the production of L-ascorbic acid.

Collaborations

Ichikawa’s listed coworkers include Takashi Shibata and Yoshimasa Saito. The patent information provided identifies her association with Fujisawa Pharmaceutical Company, Ltd.

Conclusion

Chiyo Ichikawa’s patent documents an enzyme-based approach to processing materials used in L-ascorbic acid production, reflecting her contribution to biochemical innovation.