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Polyethyleneglycol acid or active ester connected to omega amino acid at their ends, preparation method and application

A technology of polyethylene glycol acid and polyethylene glycol, which is applied in the field of polyethylene glycol active ester and its preparation, can solve the problems of slow reaction and poor reactivity, and achieve the effect of easy separation

Inactive Publication Date: 2005-08-31
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Currently, many activated carboxy-PEGs used for modification have poor reactivity: either react too quickly or react too slowly
For example, the NHS ester of carboxymethylated PEG (CM-PEG) is so reactive that it hydrolyzes immediately when dissolved in water. This high reactivity is a serious drawback of the active ester of carboxymethylated PEG.

Method used

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  • Polyethyleneglycol acid or active ester connected to omega amino acid at their ends, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] MPEG-CH with a molecular weight of 5kD 2 CONH-CH 2 CH 2 Synthesis of COONHS

[0045] Step 1: Preparation of CM-PEG (carboxymethylated polyethylene glycol):

[0046]Dissolve 10g (2 mmol) of monomethoxy polyethylene glycol (diol) with a molecular weight of 5kD in toluene, distill a part of the toluene to azeotropically remove water, and then add 3 mmol of potassium tert-butoxide for reflux reaction 1.5h, then slowly add 3 millimoles of ethyl bromoacetate to reflux for 3h, then react at room temperature for 21h, filter to remove the precipitate, evaporate the solvent under reduced pressure, add a small amount of dichloromethane to dissolve the residue, and precipitate the product with dry ether. The product was dissolved in deionized water, and 0.1 mol / L sodium hydroxide solution was added until the pH value of the solution stabilized at pH 10, then the pH of the solution was adjusted to 3 with 0.1 mol / L hydrochloric acid, and the solution was extracted three times with the sa...

Embodiment 2

[0059] Synthesize mPEG-CH with a molecular weight of 12kD 2 CONH-CH 2 CH 2 CH 2 COOH

[0060] step 1:

[0061] Preparation of CM-PEG (carboxymethylated polyethylene glycol):

[0062] Dissolve 12g (1 mmol) of monomethoxy polyethylene glycol with a molecular weight of 12kD in an appropriate amount of toluene, distill a part of the toluene to azeotropically remove water, and then add 2 mmol of potassium tert-butoxide and reflux for 2h. Then slowly add 2 millimoles of ethyl bromoacetate to reflux for 4 hours, then react at room temperature for 18 hours, filter to remove the precipitate and evaporate the solvent under reduced pressure. The residue is dissolved in dichloromethane, and the product is precipitated with dry ether. The product is dissolved in In deionized water, gradually add 0.1 mol / L sodium hydroxide solution until the pH of the solution stabilizes at pH 10, then adjust the pH of the solution to 3 with 0.1 mol / L hydrochloric acid, extract the solution three times with the...

Embodiment 3

[0073] Synthesis of mPEG-CH with a molecular weight of 20kD 2 CONH-(CH 2 ) 5 COOH

[0074] step 1:

[0075] Preparation of CM-PEG (carboxymethylated polyethylene glycol):

[0076] Dissolve 20g (1 mmol) of monomethoxy polyethylene glycol with a molecular weight of 20kD in an appropriate amount of toluene, distill a part of the toluene to azeotropically remove water, and then add 3 mmol of potassium tert-butoxide and reflux for 2h. Then slowly add 1.5 millimoles of ethyl bromoacetate to reflux for 4 hours, and then react at room temperature for 24 hours. After filtering to remove the precipitate, the solvent is evaporated under reduced pressure. The residue is dissolved by adding a small amount of dichloromethane, and the product is precipitated with dry ether. In deionized water, gradually add 0.1 mol / L sodium hydroxide solution until the pH of the solution stabilizes at pH 11, then adjust the pH of the solution to 3 with 0.1 mol / L hydrochloric acid, extract the solution three time...

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Abstract

An acid or active ester of polyethanediol, whose terminal end is linked with omega-amino acid has the structural formula: CH3-(OCh2CH2)n-CONH-(CH2)m-CO2-Q, 10-30 min of semi life in water and ideal reactive activity to amino.

Description

Technical field [0001] The invention relates to a polyethylene glycol water-soluble polymer and a preparation method and application thereof, in particular to a polyethylene glycol active ester and a preparation method and application thereof. Background technique [0002] The use of chemical methods to bind the water-soluble polymer polyethylene glycol to molecules and surfaces has great application significance in biotechnology. Its most common form, PEG, is a linear polymer, and the polymer is HO-CH with hydroxyl groups at both ends. 2 -CH 2 O-(CH 2 CH 2 O)n-CH 2 CH 2 OH. [0003] The above-mentioned polymer α,ω-dihydroxy polyethylene glycol can be represented by the following simplified formula HO-PEG-OH. As an example of the biotechnology application of PEG: some active derivatives of PEG are bound to the molecules of proteins and enzymes, PEG can be dissolved in organic solvents, and the binding of PEG to enzyme molecules can make the conjugate of PEG and enzyme soluble in ...

Claims

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Application Information

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IPC IPC(8): A61K31/195A61K47/18C08G65/48
Inventor 何明磊魏东芝
Owner EAST CHINA UNIV OF SCI & TECH
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