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    • 5. 发明专利
    • PRODUCTION OF L-RHAMNOSE
    • JPS62126193A
    • 1987-06-08
    • JP26392085
    • 1985-11-26
    • TOWA KASEI KOGYO KK
    • TAKEMURA MOTOHIROIIJIMA BOSEKITATENO YOSHIAKISUGA MAMORUOKAMOTO NAOKI
    • C07H3/08C07H1/08C07H3/02C12P19/02C13K13/00
    • PURPOSE:To obtain the titled substance at a low cost, by neutralizing a hydrolysis liquid of Monostroma nitidum Wittrock, passing the liquid through an alkali (alkaline earth) metal salt type cation-exchange resin to separate into sugar component and salts, and then the sugar component is subjected successively to purification, concentration and crystallization. CONSTITUTION:Monostoma nitidum Wittrock is subjected to hot water- extraction to extract its water-soluble component and hydrolized at 120-140 deg.C by adding an inorganic acid, normally such as sulfuric acid. Then thus obtained hydrolysis liquid is neutralized to 5-7pH by adding normally a metal hydroxide or carbonate, as necessary, followed by addition of activated charcoal and filtration to obtain the neutralized hydrolysis liquid. Then a specific amount of the said neutralized liquid is fed to a column packed with an alkali (alkaline earth) metal salt type cation-exhange resin and separated into a sugar component and salts by using such as water as an eluent. Further the sugar component is subjected to purification treatment such as decolorization and deionization, and concentrated and crystallized to obtain the aimed substance.