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PubMed2005

Boronic acid fluorescent sensors for monosaccharide signaling based on the 6-methoxyquinolinium heterocyclic nucleus: progress toward noninvasive and continuous glucose monitoring.

The synthesis, characterization, and spectral properties of strategically designed boronic acid containing fluorescent sensors, o-, m-, p-BMOQBA, for the potential detection of tear glucose concentrations when immobilized in plastic disposable contact lenses is described. The new probes, BMOQBAs, consist of the 6-methoxyquinolinium nucleus as a fluorescent indicator, and the boronic acid moiety as a glucose chelating group. A control compound BMOQ, which has no boronic acid group and therefore does not bind monosaccharides has also been prepared. In this paper, we show that structural design considerations of the new probes have afforded for their compatibility within the lenses, with reduced probe sugar-bound pK(a) favorable with the mildly acidic lens environment. In addition, the new probes are readily water soluble, have high quantum yields, and can be prepared by a simple one-step synthetic procedure.

Boronic Acids↗
PubMed1992

Can continuous glucose monitoring be used for the treatment of diabetes.

In the case of the glucose sensor, clinicians and chemists must cooperate in interdisciplinary research to carefully define the analytical problem. Although not specifically discussed in this article, another group that must participate in this effort is engineers. Their expertise is needed to design the monitoring and control unit that contains the alarm and pump systems. The glucose sensor must operate reliably in an in vivo environment, provide the clinical information needed, and be easy to operate and manufacture.

Animals↗
PubMed2006

[Continuous glucose monitoring using the glucose sensor CGMS in metabolically normal pregnant women during betamethasone therapy for fetal respiratory distress syndrome].

PURPOSE: The object of this study was to evaluate the effect of betamethasone therapy on maternal glucose levels, to observe the incidence of ketoacidosis and gestational diabetes as well as to judge fetal outcome. METHODS: 26 patients underwent measurement with the CGMS for at least 72-hour. Morning urine was examined for ketones and glucose, venous blood was drawn from a hand vein for blood gas measurements. At a minimum of seven days after the last betamethasone treatment, an oral glucose tolerance test was performed to exclude gestational diabetes. For fetal outcome weight, body length, head circumference, APGAR and pH of umbilical cord blood were determined. RESULTS: All patients showed transient hyperglycaemia from day 1 to day 2 with normoglycaemia on day 3 (mean +/- SD: 129.6 +/- 20 mg/dL on day 1, 127.1 +/- 17.7 mg/dL on day 2, 96.7 +/- 12.9 mg/dL on day 3, and 91.3 +/- 17.8 mg/dL on day 4). There was a significant fall (p < 0.01) of the mean glucose levels between day 1/3, day 1/4, day 2/3, day 2/4. Neither acidosis (pH < 7.35) nor clinically relevant BE/lactate shifts were seen. Ketonuria was detected in 30 % of the patients before betamethasone, rose to 50 % (on day 1), fell to 24 % (on day 2), and 6 % (on day 3). One week later one patient (4 %) was diagnosed as having gestational diabetes, while four (17 %) showed impaired glucose tolerance. Fetal outcome showed no significant difference compared to the average of the Virchow Klinikum. CONCLUSION AND DISCUSSION: Pregnant patients have high glucose measurements for two days during betamethasone therapy. No maternal acidosis and no diabetic delayed metabolic effects were seen, and fetal outcome showed good results. A prophylactic use of insulin is not generally needed in healthy women.

Adult↗