Takeda Chemical Industries, Inc.

Taisei Corporation

Akira Haze

Tomomi Ikemoto

Kiyoshi Nara

Yasunori Matsuoka

Takafumi Naito

Norio Okutani

Kazuki Miyanagi

Yoshihisa Yamamoto

Kunihiro Ito

Kazunao Yokota

Hiroyuki Hatano

Yoshifumi Kitamoto

Takefumi Shindoh

Shunsaku Uchida

A method of producing 5'-nucleotide, which comprises maintaining a nucleoside suspension in an organic solvent at a temperature not lower than about 20.degree. C., and then subjecting the resultant suspension to a phosphorylatipon of the nucleoside(s). According to the present invention, 5'-nucleotide can be produced from a nucleoside at high purity and high yield in a shortened reaction time, and impurity removal in the nucleotide purification process is easily accomplished.

Method for producing 5'-nucleotide

There is disclosed a process for producing purified xanthan gum, which comprises (i) adding a hydrophilic organic solvent to an aqueous solution containing crude xanthan gum with pH 0.5 to 2.5, and (ii) neutralizing the mixture with a base to precipitate the xanthan gum. The xanthan gum thus obtained has low contents of ash and remaining organic solvent, as well as a high quality with little impurities, and can advantageously be used in the fields of foods, cosmetics, medicaments and the like.

Process for producing purified xanthan gum

A segregation reducing agent for a hydraulic composition which is obtained by adding a water-soluble thickener to a culture of a microorganism capable of producing a .beta.-1,3-glucan selected from the group consisting of curdlan, palamylon and pachyman, in a sufficient amount to give a viscosity to the culture of from about 200 to 2000 cp, followed by spray drying so as to form a powder having a core of the .beta.-1,3-glucan and a coating of the water-soluble thickener.

Segregation reducing agent for hydraulic composition and hydraulic

This invention provides a hydraulic composition which contains a cementitious material in powder form, .beta.-1,3-glucan, and a superplasticizer. The composition makes it possible to prepare concrete with high resistance to segregation, high fluidity, and excellent filling ability. Because of this, vibration of the concrete is not necessary during casting; it can simply be poured.

Hydraulic composition, formed products therefrom and segregation

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Kawanishi, Japan

Akira Haze