Optical determination of glucose utilizing boronic acid adducts
The present invention concerns an improved optical method and optical sensing device for determining the levels of polyhydroxyl-substituted organic molecules in vitro and/or in vivo in aqueous media. The range of detection is between about 400 and 800 nm. In particular, a sensory devise is implemented in a mammal to determine sugar levels. Specifically, a dye is combined with a conjugated nitrogen-containing heterocyclic aromatic boronic acid-substituted bis-onium compound in the presence of a sugar, such as fructose or glucose. The viologens are preferred as the aromatic conjugated nitrogen-containing boronic acid substituted compounds. The method is useful to determine sugar levels in a human being.
1. A viologen compound having the structure
where
L is a hydrolytically stable covalent linking group selected from the group consisting of a direct bond, lower alkylene having 1 to 8 carbon atoms optionally terminated with, or including, one or more divalent connecting groups, wherein each divalent connecting group is independently selected from the group consisting of sulfonamide, amide, ester, ether, sulfide, sulfone, phenylene, urethane, urea, and amine;
Z is selected from the group consisting of
(i) a polymerizable ethylenically unsaturated group selected from the group consisting of —R 10 —CO 2 —C(R 11 )═CH 2 , R10-NH—(C═O)—C(R11)═CH2, or —CH 2 —C 6 H 4 —CH═CH 2 , where R 10 is a lower alkylene or hydroxyalkylene of 2 to 6 carbon atoms and R 11 is hydrogen or methyl,
(ii) a coupling group of formula —R 12 —Z 3 , where R 12 is —CH 2 C 6 H 4 — or alkylene of 2 to 6 carbon atoms, and where Z 3 is —OH, —SH, —CO 2 H, or —NH 2 ;
(iii) 2-, 3- or 4-(CH 2 ═CH)-pyridinium; —N—(CH 2 ) w —O(C═O)C(CH 3 )═CH 2 ); —O—(CH 2 ) w , —O—CH 2 —(CH═CH 2 ); —O—(CH 2 ) w —O—(C═O)CH(═CH 2 ); or —O—(CH 2 ) w —O—(C═O)C(CH 3 )═CH 2 ; and
(iv) —OH, —SH, —CO 2 H, or —NH 2 ; wherein
w is a integer from 2 to 6;
R′ is hydrogen or —B(OH) 2 ;
R″ is selected from the group consisting of hydrogen, —B(OH) 2 , and a coupling group of formula —R 12 —Z 3 , where R 12 is —CH 2 C 6 H 4 — or alkylene of 2 to 6 carbon atoms, and where Z 3 is —OH, —SH, —CO 2 H, or —NH 2 ; and
X is a halogen.
2. The viologen compound of claim 1 , wherein the compound is selected from the group consisting of:
or a free acid or conjugate salt thereof,
wherein m and n is each independently between 1 and 6.
3. The viologen compound of claim 2 , wherein the compound is:
or a free acid or conjugate salt thereof.
4. The viologen compound of claim 1 , wherein the compound is selected from the group consisting of:
5. A compound, selected from the group consisting of:
wherein m and n is each independently between 1 and 6.
6. A viologen compound selected from the group consisting of:
wherein m and n is each independently between 1 and 6, and
wherein X is bromide or chloride.
7. A viologen compound selected from the group consisting of: