Polar-modified bonded phase materials for chromatographic separations
First Claim
Patent Images
1. A composition for use as a stationary phase in chromatography comprising an inorganic substrate that is modified with at least one silane having the formula
R1δ
- -Qα
-(CH2)β
SiR2γ
X3-γ
,wherein R1 is hydrogen, C1–
C100 substituted or unsubstituted hydrocarbyl, cycloalkyl, heterocycloalkyl, aryl, or heteroaryl;
wherein the substituents are selected from C1–
C12 hydrocarbyl, hydroxyl, alkoxy, halogen, amino, nitro, sulfo, and carbonyl;
α
is 0 or 1;
β
is 0–
30;
γ
is 0, 1 or 2;
δ
is 0–
3;
R2 is C1–
C100 substituted or unsubstituted hydrocarbyl, cycloalkyl, heterocycloalkyl, aryl, or heteroaryl;
wherein the substituents are selected from C1–
C12 hydrocarbyl, hydroxyl, alkoxy, halogen, amino, nitro, sulfo, and carbonyl;
Q is independently selected from —
NHC(O)—
, —
C(O)NH—
, —
OC(O)NH—
, —
NHC(O)O—
, —
NHC(O)NH—
, —
NCO, —
CHOHCHOH—
, CH2OCHCH2O—
, —
(CH2CH2O)n—
, —
(CH2CH2CH2O)n—
, —
C(O)—
, —
C(O)O—
, —
OC(O)—
, CH3C(O)CH2—
, —
S—
, —
SS—
, —
CHOH—
, —
O—
, —
SO—
, —
SO2—
, —
SO3—
, —
OSO3—
, —
SO2NH—
, —
SO2NMe—
, —
NH—
, —
NMe—
, —
NMe2+—
, —
N[(CH2)n]2+—
, —
CN, —
NC, —
CHOCH—
, —
NHC(NH)NH—
, —
NO2, —
NO, —
OPO3—
, where n is 1–
30; and
X is a leaving group.wherein said inorganic substrate is equilibrated in an atmosphere having a defined relative humidity of less than 40% prior to being modified with the at least one silane, sufficiently to minimize anion exchange activity and enhance stability to base and acid treatment.
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Abstract
Novel compositions are disclosed for use as a stationary phase in chromatography comprising an inorganic substrate that is modified with at least one silane having the formula R1δ-Qα-(CH2)βSiR2γX3-γ. In a preferred embodiment, the inorganic substrate is silica gel and is modified with at least two silanes. Methods of preparation and use in chromatographic applications are disclosed. The novel compositions provide superior chromatographic performance, reduced silanol activity, enhanced stability, and reproducibility in preparation and performance.
-
Citations
29 Claims
-
1. A composition for use as a stationary phase in chromatography comprising an inorganic substrate that is modified with at least one silane having the formula
R1δ- -Qα
-(CH2)β
SiR2γ
X3-γ
,wherein R1 is hydrogen, C1–
C100 substituted or unsubstituted hydrocarbyl, cycloalkyl, heterocycloalkyl, aryl, or heteroaryl;
wherein the substituents are selected from C1–
C12 hydrocarbyl, hydroxyl, alkoxy, halogen, amino, nitro, sulfo, and carbonyl;α
is 0 or 1;β
is 0–
30;γ
is 0, 1 or 2;δ
is 0–
3;R2 is C1–
C100 substituted or unsubstituted hydrocarbyl, cycloalkyl, heterocycloalkyl, aryl, or heteroaryl;
wherein the substituents are selected from C1–
C12 hydrocarbyl, hydroxyl, alkoxy, halogen, amino, nitro, sulfo, and carbonyl;Q is independently selected from —
NHC(O)—
, —
C(O)NH—
, —
OC(O)NH—
, —
NHC(O)O—
, —
NHC(O)NH—
, —
NCO, —
CHOHCHOH—
, CH2OCHCH2O—
, —
(CH2CH2O)n—
, —
(CH2CH2CH2O)n—
, —
C(O)—
, —
C(O)O—
, —
OC(O)—
, CH3C(O)CH2—
, —
S—
, —
SS—
, —
CHOH—
, —
O—
, —
SO—
, —
SO2—
, —
SO3—
, —
OSO3—
, —
SO2NH—
, —
SO2NMe—
, —
NH—
, —
NMe—
, —
NMe2+—
, —
N[(CH2)n]2+—
, —
CN, —
NC, —
CHOCH—
, —
NHC(NH)NH—
, —
NO2, —
NO, —
OPO3—
, where n is 1–
30; andX is a leaving group. wherein said inorganic substrate is equilibrated in an atmosphere having a defined relative humidity of less than 40% prior to being modified with the at least one silane, sufficiently to minimize anion exchange activity and enhance stability to base and acid treatment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
- -Qα
Specification