Solid supports functionalized with phosphorus-containing dendrimers, process for preparing them and uses thereof
The present invention relates to solid supports functionalized with phosphorus-containing dendrimers, to a process for preparing them, to their use for preparing biochips and to the uses of these biochips, in particular for immobilizing molecules of interest, especially biological molecules of interest such as nucleic acids, polypeptides, lipids and proteins.
1. A biochip or dendrichip, characterized in that it consists of a solid support comprising at least one surface functionalized with phosphorus-containing dendrimers chosen from those consisting of:
a central layer in the form of a central core P 0 , optionally containing phosphorus, comprising from 2 to 12 functionalized groups,
n intermediate layers, which may be identical or different, each of said intermediate layers consisting of P 1 units corresponding to formula (I) below:
in which:
L is an oxygen, phosphorus, sulfur or nitrogen atom,
M represents one of the following groups:
an aromatic group di-, tri- or tetrasubstituted with alkyl groups, alkoxy groups, unsaturated groups of the C 1 -C 12 olefinic, azo or acetylenic type, all these groups possibly incorporating phosphorus, oxygen, nitrogen or sulfur atoms or halogens, or
an alkyl or alkoxy group comprising several substituents as defined when M is an aromatic group,
R 1 and R 2 , which may be identical or different, represent a hydrogen atom or one of the following groups: alkyl, alkoxy, aryl, optionally comprising phosphorus, oxygen, sulfur or nitrogen atoms or halogens with R 2 usually being different than R 1 ,
n is an integer between 1 and 11,
E is an oxygen, sulfur or nitrogen atom, said nitrogen atom possibly being linked to an alkyl, alkoxy or aryl group, all these groups possibly incorporating phosphorus, oxygen, nitrogen or sulfur atoms or halogens,
an external layer consisting of units P 2 , which may be identical or different, and corresponding to formula II below:
in which:
W represents one of the following groups: alkyl, alkoxy, aryl, all these groups possibly comprising phosphorus, oxygen, nitrogen or sulfur atoms or halogens,
X represents an aldehyde, thiol, amine, epoxide, carboxylic acid, alcohol or phenol group, to which are covalently bound molecules of interest.
2. The biochip as claimed in claim 1 , characterized in that it is reusable.
3. A process for preparing a biochip comprising placing a solid support containing at least one surface functionalized with phosphorus-containing dendrimers comprising at their periphery functions capable of allowing the covalent binding of molecules of interest, in contact with a buffer solution containing molecules of interest that have been prefunctionalized with, or that already comprise, one or more groups capable of forming a covalent bond with said peripheral functions of the dendrimers, wherein the peripheral functions of the dendrimers used are aldehyde functions, and the molecules of interest are prefunctionalized with, or already contain, one or more amine functions, or are prefunctionalized with one or more oxyamine (—ONH 2 ) or hydrazine (—NH—NH 2 ) functions.
4. The process as claimed in claim 3 , wherein the molecules of interest are prefunctionalized with, or already contain, one or more amine functions and the step of binding the molecules of interest is followed by a step of reduction of the imine functions.
5. The process as claimed in claim 3 , wherein the peripheral functions of the dendrimers used are thiol functions, and the molecules of interest are prefunctionalized with, or already contain, one or more thiol functions or are functionalized with one or more iodoacetamido (—NHCO—CH 2 —I) functions.
6. The process as claimed in claim 3 , wherein the peripheral functions of the dendrimers used are amine functions, and the molecules of interest are prefunctionalized with, or already contain, one or more aldehyde, α-oxoaldehyde, —COOR, —NCS or —NHS functions.
7. The process as claimed in claim 3 , wherein the peripheral functions of the dendrimers used are epoxide functions, and the molecules of interest are prefunctionalized with, or already contain, one or more amine functions.
8. The process as claimed in claim 3 , wherein the reaction for the covalent binding of the molecules of interest to the biochip is performed at a temperature of between 4 and 50° C., for a period of between 2 and 24 hours.