DE1149702B - Process for the production of dextran phosphate - Google Patents
Process for the production of dextran phosphateInfo
- Publication number
- DE1149702B DE1149702B DEV17943A DEV0017943A DE1149702B DE 1149702 B DE1149702 B DE 1149702B DE V17943 A DEV17943 A DE V17943A DE V0017943 A DEV0017943 A DE V0017943A DE 1149702 B DE1149702 B DE 1149702B
- Authority
- DE
- Germany
- Prior art keywords
- dextran
- production
- dextran phosphate
- solution
- pyridine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
- C08B37/0009—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid alpha-D-Glucans, e.g. polydextrose, alternan, glycogen; (alpha-1,4)(alpha-1,6)-D-Glucans; (alpha-1,3)(alpha-1,4)-D-Glucans, e.g. isolichenan or nigeran; (alpha-1,4)-D-Glucans; (alpha-1,3)-D-Glucans, e.g. pseudonigeran; Derivatives thereof
- C08B37/0021—Dextran, i.e. (alpha-1,4)-D-glucan; Derivatives thereof, e.g. Sephadex, i.e. crosslinked dextran
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Molecular Biology (AREA)
- Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Description
Verfahren zur Herstellung von Dextranphosphat Die Erfindung hat die Herstellung des Phosphorsäureesters des Dextrans zum Ziel. Anorganische Ester des Dextrans, so auch der Phosphorsäureester, sind in letzter Zeit beschrieben worden. Allgemein werden diese Verbindungen durch Umsetzung im wasserfreien Pyridin als Kondensationsmittel bei sehr tiefen Temperaturen (-20 bis 00 C) erhalten. Die Herstellung anorganischer Ester auf diese Weise wird sowohl durch das Einhalten tiefer Temperaturen als auch durch das Arbeiten mit Pyridin erschwert, besonders bei technologischer Anwendung.Process for the preparation of dextran phosphate The invention has that Production of the phosphoric acid ester of dextran to the goal. Inorganic esters of Dextrans, as well as the phosphoric acid ester, have recently been described. In general, these compounds are converted into anhydrous pyridine as Condensation agent obtained at very low temperatures (-20 to 00 C). The production Inorganic ester in this way is produced both by maintaining low temperatures as well as being made more difficult by working with pyridine, especially with technological ones Use.
Für die Darstellung des Phosphorsäureesters des Dextrans wurde bisher nur eine Herstellungsweise beschrieben: Gereinigtes, aktiviertes und getrocknetes, gegebenenfalls auch abgebautes Dextran wird in wasserfreiem Pyridin bei Temperaturen von - 22 bis 0° C - mit überschüssigem POCl3 oder mit einem Gemisch von P2O5 + H3PO4 versetzt. Die Veresterung wird dann bei Temperaturen bis +400 C durchgeführt. For the representation of the phosphoric acid ester of dextran has been up to now only one production method described: cleaned, activated and dried, Dextran which has also been degraded is optionally also dissolved in anhydrous pyridine at temperatures from - 22 to 0 ° C - with excess POCl3 or with a mixture of P2O5 + H3PO4 offset. The esterification is then carried out at temperatures up to +400 C.
Für diese Darstellungsweise gelten die obenerwähnten Erschwernisse. The difficulties mentioned above apply to this type of representation.
Das erfindungsgemäße Verfahren vermeidet diese Nachteile dadurch, daß als alkalisches Kondensationsmittel wäßrige Laugen benutzt werden. Dadurch kann bei Temperaturen über 0° C gearbeitet werden. Eine Belästigung, wie sie durch Pyridin auftritt, fällt fort. The method according to the invention avoids these disadvantages by that aqueous bases are used as the alkaline condensing agent. This can work at temperatures above 0 ° C. A nuisance such as that caused by pyridine occurs, falls away.
Besonders konstruierte Vorrichtungen, wie sie das Arbeiten mit Pyridin erfordern, sind nicht nötig. D;adurch, daß Dextran in wäßriger Lösung umgesetzt wird, erübrigt sich ein Ausfällen und Trocknen. Specially designed devices like those working with pyridine require are not necessary. D; adby that dextran reacted in aqueous solution there is no need for precipitation and drying.
Ebenso entfällt die Aufbereitung des Pyridins und des Dextrans zu wasserfreien Produkten. The preparation of the pyridine and dextran is also omitted anhydrous products.
Durch die Synthese des Phosphorsäureesters aus Dextran in wäßrig alkalischer Lösung, bevorzugt nitron- oder kali alkalisch, durch Zusatz von POS1. bei Temperaturen um +100 C läßt sich auf einfachem Wege Dextranphosphat herstellen. Through the synthesis of the phosphoric acid ester from dextran in aqueous alkaline solution, preferably nitrate or potassium alkaline, by adding POS1. At temperatures around +100 C, dextran phosphate can be produced in a simple way.
Zur Umsetzung sind Dextrane von beliebigem Molekulargewicht, niedermolekulare von z. B. 19000 wie auch hochmolekulare, native, geeignet. Dextrans of any molecular weight, low molecular weight, are used for implementation from Z. B. 19000 as well as high molecular weight, native, suitable.
Dextranphosphorsäureester finden therapeutische Anwendung oder stellen Zwischenprodukte für weitere Umsetzungen, wie Umesterungen usw. dar. Dextran phosphoric acid esters are used or provided therapeutically Intermediate products for further reactions, such as transesterifications, etc.
Außerdem kann das Produkt infolge seiner sirupösen Konsistenz technische Anwendung finden. Also, due to its syrupy consistency, the product can be technical Find application.
Beispiel 1 100 g Dextran (Molekulargewicht 30 000) werden in 375 ml 400/oiger Natronlauge gelöst. Man kühlt die Lösung auf etwa + 50 C und läßt eine Lösung von 230 g Phosphoroxychlorid in 100 ml n-Hexan unter kräftigem Rühren zutropfen. Das Zutropfen hat so zu erfolgen, daß die Temperatur des Reaktionsgemisches nicht über +10° C steigt. Im Laufe der Reaktion erstarrt die Lösung zu einer gallertartigen Masse. Man läßt stehen und fällt dann mit Methanol. Das Produkt wird durch Umfällen mit Methanol gereinigt. Ausbeute: 160 g. Example 1 100 g of dextran (molecular weight 30,000) are used in 375 ml of 400% sodium hydroxide solution dissolved. The solution is cooled to about + 50 ° C. and left one solution of 230 g of phosphorus oxychloride in 100 ml of n-hexane are added dropwise with vigorous stirring. The dropwise addition has to be done in such a way that the temperature of the reaction mixture does not rises above + 10 ° C. In the course of the reaction, the solution solidifies into a gelatinous one Dimensions. It is left to stand and then precipitated with methanol. The product is accidentally dropped cleaned with methanol. Yield: 160 g.
Beispiel 2 100 g Dextran (Molekulargewicht 13 000) werden in 375 ml 400/oiger Natronlauge gelöst. Man kühlt die Lösung auf etwa + 50 C und läßt eine Lösung von 230 g Phosphoroxychlorid in 100 ml n-Hexan unter kräftigem Rühren zutropfen. Das Zutropfen erfolgt so, daß die Temperatur des Reaktionsgemisches nicht über + 200 C steigt. Das Reaktionsgemisch wird im Laufe der Reaktion viskoser und verfestigt sich beim Stehen über Nacht zu einer Gallerte. Das Produkt wird mit Methanol ausgefällt und durch Umfällen mit Methanol gereinigt. Ausbeute: 115 g. Example 2 100 g of dextran (molecular weight 13,000) are used in 375 ml of 400% sodium hydroxide solution dissolved. The solution is cooled to about + 50 ° C. and left one Add dropwise a solution of 230 g of phosphorus oxychloride in 100 ml of n-hexane with vigorous stirring. The dropwise addition takes place in such a way that the temperature of the reaction mixture does not exceed + 200 C rises. The reaction mixture becomes more viscous and solidified in the course of the reaction forms a jelly when standing overnight. The product is precipitated with methanol and purified by reprecipitation with methanol. Yield: 115 g.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEV17943A DE1149702B (en) | 1960-01-21 | 1960-01-21 | Process for the production of dextran phosphate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEV17943A DE1149702B (en) | 1960-01-21 | 1960-01-21 | Process for the production of dextran phosphate |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1149702B true DE1149702B (en) | 1963-06-06 |
Family
ID=7576730
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEV17943A Pending DE1149702B (en) | 1960-01-21 | 1960-01-21 | Process for the production of dextran phosphate |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1149702B (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1040013B (en) * | 1955-07-20 | 1958-10-02 | Farmaceutici Italia | Process for the preparation of sodium salts of dextran-phosphoric acid esters |
-
1960
- 1960-01-21 DE DEV17943A patent/DE1149702B/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1040013B (en) * | 1955-07-20 | 1958-10-02 | Farmaceutici Italia | Process for the preparation of sodium salts of dextran-phosphoric acid esters |
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