Multiwell Assay for the Analysis of Sugar Gut Permeability Markers: Discrimination of Sugar Alcohols with a Fluorescent Probe Array Based on Boronic Acid Appended Viologens.
With the aim of discerning between different sugar and sugar alcohols of biomedical relevance, such as gut permeability, arrays of 2-component probes were assembled with up to six boronic acid-appended viologens (BBVs): 4,4'-o-BBV, 3,3'-o-BBV, 3,4'-o-BBV, 4,4'-o,m-BBV, 4,7'-o-PBBV, and pBoB, each coupled to the fluorophore 8-hydroxypyrene, 1,3,6-trisulfonic acid trisodium salt (HPTS). These probes were screened for their ability to discriminate between lactulose, l-rhamnose, 3-O-methyl-d-glucose, and xylose. Binding studies of sugar alcohols mannitol, sorbitol, erythritol, adonitol, arabitol, galactitol, and xylitol revealed that diols containing threo-1,2-diol units have higher affinity for BBVs relative diols containing erythro-1,2 units. Those containing both threo-1,2- and 1,3-syn diol motifs showed high affinity for boronic acid binding. Fluorescence from the arrays were examined by principle component analysis (PCA) and linear discriminant analysis (LDA). Arrays with only three BBVs sufficed to discriminate between sugars (e.g., lactulose) and sugar alcohols (e.g., mannitol), establishing a differential probe. Compared with 4,4'-o-BBV, 2-fold reductions in lower limits of detection (LOD) and quantification (LOQ) were achieved for lactulose with 4,7-o-PBBV (LOD 41 μM, LOQ 72 μM). Using a combination of 4,4'-o-BBV, 4,7-o-PBBV, and pBoB, LDA statistically segregated lactulose/mannitol (L/M) ratios from 0.1 to 0.5, consistent with values encountered in small intestinal permeability tests. Another triad containing 3,3'-o-BBV, 4,4'-o-BBV, and 4,7-o-PBBV also discerned similar L/M ratios. This proof-of-concept demonstrates the potential for BBV arrays as an attractive alternate to HPLC to analyze mixtures of sugars and sugar alcohols in biomedical applications and sheds light on structural motifs that make this possible.
Department of Chemistry and Biochemistry, University of California Santa Cruz , Santa Cruz, California 95064, United States.
Angel
A
Resendez
Department of Chemistry and Biochemistry, University of California Santa Cruz , Santa Cruz, California 95064, United States.
Priera
P
Panescu
Department of Chemistry and Biochemistry, University of California Santa Cruz , Santa Cruz, California 95064, United States.
Ruth
R
Zuniga
Department of Chemistry and Biochemistry, University of California Santa Cruz , Santa Cruz, California 95064, United States.
Isaac
I
Banda
IIRBS, Mahatma Gandhi University , Kottayam, 686560, India.
Jorly
J
Joseph
Department of Chemistry and Biochemistry, University of California Santa Cruz , Santa Cruz, California 95064, United States.|Department of Medical Sciences, Gastroenterology and Hepatology, Uppsala University , 751 85, Uppsala, Sweden.
Dominic-Luc
DL
Webb
Department of Chemistry and Biochemistry, University of California Santa Cruz , Santa Cruz, California 95064, United States.
Bakthan
B
Singaram
D001897:Boronic Acids / Q000737:chemistry*; D016002:Discriminant Analysis; D005456:Fluorescent Dyes / Q000737:chemistry; D007792:Lactulose / Q000032:analysis; D057230:Limit of Detection; D008353:Mannitol / Q000032:analysis; D010539:Permeability; D025341:Principal Component Analysis; D013050:Spectrometry, Fluorescence; D013402:Sugar Alcohols / Q000032:analysis*; D014755:Viologens / Q000737:chemistry*; D014994:Xylose / Q000032:analysis
D001897:Boronic Acids; D005456:Fluorescent Dyes; D013402:Sugar Alcohols; D014755:Viologens; D008353:Mannitol; D007792:Lactulose; D014994:Xylose