Enrichment of lysophosphatidic acids with templated polymeric materials

Patent metadata

Field	Value
Publication number	US-2018071716-A1
Application number	US-201615553947-A
Country	US
Kind code	A1
Filing date	Feb 23, 2016
Priority date	Feb 27, 2015
Publication date	Mar 15, 2018
Grant date	—

Abstract

Embodiments of templated polymeric materials capable of binding lysophosphatidic acids (LPAs) are disclosed. Methods of making and using the templated polymeric materials also are disclosed. The disclosed templated polymeric materials are molecularly imprinted polymers that bind LPAs and facilitate the production of lysophosphatidic acid-enriched samples, for instance through extraction of lysophosphatidic acids from biological samples, such as plasma or serum samples.

First claim

1 - 30 . (canceled)

31 . A molecularly imprinted polymer, comprising:
a plurality of first structural units derived from monomers comprising (a) at least one functional moiety selected from an amino, —N(H)C(O)N(H), —N(H)—C(S)—N(H)—, pyridyl, imidazolyl, pyrimidinyl, pyrazinyl, or cyclenyl moiety, or any combination thereof, and (b) at least one polymerizable moiety, the molecularly imprinted polymer having a molecular imprint having a size and shape complementary to a lysophosphatidic acid, wherein the molecularly imprinted polymer is obtained by:
polymerizing the monomers in a solution comprising (i) a solvent, (ii) a guest molecule comprising an anionic head group and a hydrophobic tail portion comprising a single aliphatic or heteroaliphatic chain with a length of from 12-24 carbons, (iii) a crosslinker, and (iv) a radical polymerization initiator to produce a polymer containing the guest molecule, and
removing the guest molecule from the polymer containing the guest molecule to produce the molecularly imprinted polymer.

32 . The molecularly imprinted polymer of claim 31 , wherein:
(a) at least some of the monomers comprise a plurality of functional moieties capable of binding to a phosphate group; (b) the polymerizable moiety comprises a terminal ethenyl group; or (c) both (a) and (b).

33 . The molecularly imprinted polymer of claim 31 , wherein the first structural units are derived from monomers according to one of the following five chemical structures or a combination of two or more thereof:

34 . The molecularly imprinted polymer of claim 31 , further comprising a plurality of second structural units derived from monomers capable of binding to at least one of a phosphate acid group or a hydroxyl group, optionally wherein the second structural units are derived from 2-vinylpyridine, 4-vinylpyridine, 1-vinylimidazole, 4-vinylimidazole, 1-allylthiourea, methacrylic acid, or a combination of two or more thereof.

35 . The molecularly imprinted polymer of claim 34 , wherein the first structural unit and the second structural unit are present in a mole ratio from 10:1 to 1:10.

36 . The molecularly imprinted polymer of claim 31 , wherein the guest molecule comprises an anionic head comprising a phosphate or phosphonic acid group.

37 . The molecularly imprinted polymer of claim 31 , wherein the guest molecule is octadecylphosphonic acid.

38 . The molecularly imprinted polymer of claim 31 , wherein:
(a) the crosslinker comprises ethylene glycol dimethacrylate (EGDMA), divinylbenzene (DVB), tetraethylene glycol dimethacrylate (TEGDMA), N,O-bismethacrylolyl ethanolamine (NOBE), N,N′-methylenebismethacrylamide (MMAA), triallyl isocyanurate (TAIL), trimethylolpropane trimethacrylate (TRIM), or a combination of two or more thereof; (b) the radical polymerization initiator comprises 2,2′-azobisisobutyronitrile; or (c) both (a) and (b).

39 . The molecularly imprinted polymer of claim 33 , wherein:
(a) the polymer comprises first structural units derived from monomer 1 and the crosslinker in a mole ratio of 1:5 to 1:50; or (b) the molecularly imprinted polymer comprises first structural units derived from monomer 1, second structural units derived from methacrylic acid, and EGDMA in a 1:1:20 mole ratio.

40 . A method for producing a molecularly imprinted polymer for binding a lysophosphatidic acid, the method comprising:
polymerizing monomers comprising (a) at least one functional moiety selected from an amino, —N(H)—C(O)—N(H)—, —N(H)—C(S)—N(H)—, pyridyl, imidazolyl, pyrimidinyl, pyrazinyl, or cyclenyl moiety, or any combination thereof, and (b) at least one polymerizable moiety in a solution comprising (i) a solvent, (ii) a guest molecule comprising an anionic head group and a hydrophobic tail portion comprising a single aliphatic or heteroaliphatic chain with a length of from 12-24 carbons, (iii) a crosslinker, and (iv) a radical polymerization initiator to produce a polymer containing the anionic guest molecule; and removing the guest molecule from the polymer containing the guest molecule to produce a molecularly imprinted polymer having a molecular imprint having a size and shape complementary to lysophosphatidic acid.

41 . The method of claim 40 , wherein the monomers are monomers according to one of the following five chemical structures or a combination of two or more thereof:

42 . The method of claim 40 , wherein the monomers further comprise 2-vinylpyridine, 4-vinylpyridine, 1-vinylimidazole, 4-vinylimidazole, 1-allylthiourea, methacrylic acid, or a combination of two or more thereof.

43 . The method of claim 40 , wherein the guest molecule comprises an anionic head comprising a phosphate or phosphonic acid group.

44 . A method of preparing a lysophosphatidic acid-enriched sample, comprising:
loading a solution comprising one or more lysophosphatidic acid species onto a solid-phase extraction cartridge including a stationary phase comprising a molecularly-imprinted polymer according to claim 1 (MIP SPE cartridge); flowing chloroform and subsequently a lower alkyl alcohol through the MIP SPE cartridge; and flowing an alkaline solution comprising a lower alkyl alcohol through the MIP SPE cartridge, thereby eluting at least a portion of the lysophosphatidic acid species from the MIP SPE cartridge to provide a lysophosphatidic acid-enriched sample.

45 . The method of claim 44 , further comprising preparing the solution comprising one or more lysophosphatidic acid species by:
combining a sample comprising plasma or serum with a solvent comprising a lower alkyl alcohol and chloroform to form a mixture; separating the mixture to provide a supernatant and a precipitate; acidifying the supernatant to provide the solution comprising one or more lysophosphatidic acid species.

46 . The method of claim 45 , wherein acidifying the supernatant further comprises:
after separating the mixture, loading the supernatant onto a SPE cartridge including a stationary phase comprising a non-imprinted polymer comprising (i) a plurality of first structural units derived from monomers comprising (a) at least one functional moiety capable of binding to a phosphate group and (b) at least one polymerizable moiety (NIP SPE cartridge), and (ii) a crosslinker; flowing an alkaline solution comprising a lower alkyl alcohol through the NIP SPE cartridge to provide an eluent; and acidifying the eluent to provide the solution comprising one or more lysophosphatidic acid species.

47 . The method of claim 46 , wherein the first structural units of the non-imprinted polymer are derived from monomers according to one of the following five chemical structures or a combination of two or more thereof:

48 . The method of claim 46 , wherein the first structural units of the non-imprinted polymer are derived from monomers having the same chemical composition as the monomers from which the first structural units of the molecularly imprinted polymer are derived.

49 . The method of claim 46 , wherein:
(a) flowing an alkaline solution comprising a lower alkyl alcohol through the NIP SPE cartridge comprises flowing 0.05 wt % NH 4 OH in methanol through the NIP SPE cartridge; (b) acidifying the eluent comprises ad

Assignees

• Univ Portland State

Inventors

• Strongin Robert M
• Sibrian-Vazquez Martha
• Wang Jialu
• Escobedo-Cordova Jorge O

Classifications

• G01N2600/00

  Assays involving molecular imprinted polymers/polymers created around a molecular template · CPC title

• C08F22/22

  Esters containing nitrogen · CPC title

• B01J20/268 Primary

  Polymers created by use of a template, e.g. molecularly imprinted polymers · CPC title

• B01D15/325

  Reversed phase · CPC title

• G01N1/405

  by adsorption or absorption · CPC title