scholarly journals Detection of Human Plasma Glucose Using a Self-Powered Glucose Biosensor

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 825 ◽  
Author(s):  
Gymama Slaughter ◽  
Tanmay Kulkarni
Keyword(s):  
Human Plasma ◽  
Power Density ◽  
Plasma Glucose ◽  
Cell Voltage ◽  
Glucose Biosensor ◽  
Biofuel Cell ◽  
Diabetic Patients ◽  
Glucose Levels ◽  
External Power Source ◽  
Self Powered

This work presents the characterization of a self-powered glucose biosensor using individual sequential assays of human plasma glucose obtained from diabetic patients. The self-powered glucose biosensor is exploited to optimize the assay parameters for sensing plasma glucose levels. In particular, the biofuel cell component of the system at pH 7.4, 37 °C generates a power density directly proportional to plasma glucose and exhibited a maximum power density of 0.462 mW·cm−2 at a cell voltage of 0.213 V in 5 mM plasma glucose. Plasma glucose is further sensed by monitoring the charge/discharge frequency (Hz) of the integrated capacitor functioning as the transducer. With this method, the plasma glucose is quantitatively detected in 100 microliters of human plasma with unprecedented sensitivity, as high as 104.51 ± 0.7 Hz·mM−1·cm−2 and a detection limit of 2.31 ± 0.3 mM. The results suggest the possibility to sense human plasma glucose at clinically relevant concentrations without the use of an external power source.

scholarly journals Development of a Sensitive Self-Powered Glucose Biosensor Based on an Enzymatic Biofuel Cell

Biosensors ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 16
Author(s):  
Kantapat Chansaenpak ◽  
Anyanee Kamkaew ◽  
Sireerat Lisnund ◽  
Pannaporn Prachai ◽  
Patipat Ratwirunkit ◽  
...  
Keyword(s):  
Carbon Nanostructures ◽  
Glucose Sensor ◽  
Glucose Dehydrogenase ◽  
Food Samples ◽  
Glucose Biosensor ◽  
Biofuel Cell ◽  
Multi Wall Carbon Nanotubes ◽  
Gas Purge ◽  
External Power Source ◽  
Self Powered

Biofuel cells allow for constructing sensors that leverage the specificity of enzymes without the need for an external power source. In this work, we design a self-powered glucose sensor based on a biofuel cell. The redox enzymes glucose dehydrogenase (NAD-GDH), glucose oxidase (GOx), and horseradish peroxidase (HRP) were immobilized as biocatalysts on the electrodes, which were previously engineered using carbon nanostructures, including multi-wall carbon nanotubes (MWCNTs) and reduced graphene oxide (rGO). Additional polymers were also introduced to improve biocatalyst immobilization. The reported design offers three main advantages: (i) by using glucose as the substrate for the both anode and cathode, a more compact and robust design is enabled, (ii) the system operates under air-saturating conditions, with no need for gas purge, and (iii) the combination of carbon nanostructures and a multi-enzyme cascade maximizes the sensitivity of the biosensor. Our design allows the reliable detection of glucose in the range of 0.1–7.0 mM, which is perfectly suited for common biofluids and industrial food samples.

scholarly journals Body Mass Index, Fasting Plasma Glucose Levels, and C-peptide Levels as Predictors of the Future Insulin Use in Japanese Type 2 Diabetic Patients

2010 ◽  
Vol 57 (3) ◽  
pp. 237-244 ◽  
Author(s):  
Atsushi GOTO ◽  
Maki TAKAICHI ◽  
Miyako KISHIMOTO ◽  
Yoshihiko TAKAHASHI ◽  
Hiroshi KAJIO ◽  
...  
Keyword(s):  
Body Mass Index ◽  
Plasma Glucose ◽  
Fasting Plasma Glucose ◽  
Diabetic Patients ◽  
Type 2 Diabetic Patients ◽  
C Peptide ◽  
Glucose Levels ◽  
Insulin Use ◽  
Type 2 Diabetic

scholarly journals A Self-Powered Glucose Biosensor Operated Underwater to Monitor Physiological Status of Free-Swimming Fish

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1827
Author(s):  
Shih-Hao Huang ◽  
Wei-Hung Chen ◽  
Yu-Chen Lin
Keyword(s):  
Blood Glucose ◽  
Glucose Biosensor ◽  
Physiological Status ◽  
Free Swimming ◽  
Glucose Levels ◽  
Blood Glucose Levels ◽  
Self Powered ◽  
A Charge ◽  
Caudal Area ◽  
A Current

The changes in blood glucose levels are a key indicator of fish health conditions and are closely correlated to their stress levels. Here, we developed a self-powered glucose biosensor (SPGB) consisting of a needle-type enzymatic biofuel cell (N-EFC), which was operated underwater and connected to a charge pump integrated circuit (IC) and a light emitting diode (LED) as the indicator. The N-EFC consisted of a needle bioanode, which was inserted into the caudal area of a living fish (Tilapia) to access biofuels, and a gas-diffusion biocathode sealed in an airtight bag. The N-EFC was immersed entirely in the water and connected to a charge pump IC with a capacitor, which enabled charging and discharging of the bioelectricity generated from the N-EFC to blink an LED. Using a smartphone, the glucose concentration can be determined by observing the LED blinking frequencies that are linearly proportional to the blood glucose concentration within a detection range of 10–180 mg/dL. We have successfully demonstrated the feasibility of the SPGB used to continuously monitor the physiological status of free-swimming fish treated with cold shock in real time. The power generated by a free-swimming fish with an N-EFC inserted into its caudal area, swimming in a fish tank with a water temperature (Tw) of 25 °C, exhibited an open circuit voltage of 0.41 V and a maximum power density of 6.3 μW/cm2 at 0.25 V with a current density of 25 μA/cm2. By gradually decreasing Tw from 25 °C to 15 °C, the power generation increased to a maximum power density of 8.6 μW/cm2 at 0.27 V with a current density of 31 μA/cm2. The blood glucose levels of the free-swimming fish at 25 °C and 15 °C determined by the blinking frequencies were 44 mg/dL and 98 mg/dL, respectively. Our proposed SPGB provides an effective power-free method for stress visualization and evaluation of fish health by monitoring a blinking LED through a smartphone.

Hypoglycemia in Elderly Diabetic Patients with Good Glycemic Control attending Cardiology Out Patient Department of a Superspeciality Hospital

2020 ◽  
Vol 16 (1) ◽  
Author(s):  
Deepika Mittal ◽  
Purushottam Mittal
Keyword(s):  
Glycemic Control ◽  
Plasma Glucose ◽  
Fasting Plasma Glucose ◽  
Diabetic Patients ◽  
Precipitating Factors ◽  
Good Glycemic Control ◽  
Glucose Levels ◽  
Fasting Plasma ◽  
Significant Difference ◽  
Hba1c Levels

Objective-Clinical trials and observational studies have provided good evidence that early glycemic control leads to a reduction in complications and improved survival in diabetics. However, elevated risk of mortality has been reported at both the lower and upper ends of long-term glucose levels. Fear of hypoglycemia has been a significant factor in suboptimal glycemic control. In this retrospective analysis we aimed to identify the incidence of hypoglycemia and their precipitating factors in elderly diabetics on good glycemic control. Material and methods- Ninety seven elderly diabetic patients attending the cardiology Out-Patients Department of a super speciality private sector hospital from 1 December 2017 to 30 November 2018 were studied retrospectively. Their demographic profile, co-morbidities and pharmacological profile were recorded. Incidence of hypoglycemic episodes and their precipitating factor were then analyzed. Result-Mean age was 71.7± 6.3 years, and 64 (66%) were male. Mean duration of diabetes was 7.3± 1.3 years. All patients had type II diabetes mellitus. Mean fasting and random capillary blood glucose levels were 116.5 ±8.7 mg/dl and 169.5±13.5mg/dl, respectively. Mean HbA1c levels of the study population was 6.8±1.14. Over the study period, 23 (23.7%) patients experienced 39 episodes of any level of hypoglycemia. HbA1c Levels in the hypoglycemia group were not significantly different from those in no-hyperglycemia group (6.85±1.13 vs. 6.63±1.04). Mean random plasma glucose values were slightly higher in no-hypoglycemia group (170.9±14.5 vs 164.9±14.9), but the difference did not reach the statistical significance. There was a markedly significant difference in mean fasting plasma glucose values between hypoglycemia and no-hypoglycemia group (101.8±8.9 vs 116.5±12.7). Sulphonylurea and insulin use was more frequent in patients experiencing hypoglycemia (9.6% and 52.2% respectively) as compared with no-hypoglycemia group (33.8% and 39.1% respectively). The most common preceding event was either skipping a meal in 12(30.8%) patients or an unplanned change in diet in 23% patients. Conclusion- Patients with longstanding diabetes and loss of warning symptoms have increased risk of severe hypoglycaemic episodes. Risk of the hypoglycemic episode is better correlated with fasting plasma glucose levels and glycemic variability rather than with HbA1c Level. Sulphonylurea drug use was the only group associated with a statistically significant risk of hypoglycemia. Skipping of a meal or a sudden change in the diet and alteration in antidiabetic drug regimen are the most important precipitating factors for hypoglycemia.

Association of serum glycated albumin to haemoglobin A1C ratio with hepatic function tests in patients with chronic liver disease

2009 ◽  
Vol 46 (5) ◽  
pp. 368-372 ◽  
Author(s):  
Yukihiro Bando ◽  
Hideo Kanehara ◽  
Daisyu Toya ◽  
Nobuyoshi Tanaka ◽  
Soji Kasayama ◽  
...  
Keyword(s):  
Liver Disease ◽  
Chronic Liver Disease ◽  
Plasma Glucose ◽  
Glycated Albumin ◽  
Hepatic Function ◽  
Chronic Liver ◽  
Diabetic Patients ◽  
Haemoglobin A1c ◽  
Glucose Levels ◽  
The Mean

Background In patients with chronic liver disease (CLD), glycated haemoglobin (HbA1C) levels have been shown to be apparently lower than real values, whereas serum glycated albumin (GA) levels are apparently higher. The present study was aimed to examine whether both glycaemic indices are influenced by hepatic function. Methods Subjects consisted of 82 patients with CLD. Various indicators for hepatic function as well as HbA1C and GA were also measured. Estimated HbA1C values were calculated from the mean plasma glucose levels. Two hundred and two type 2 diabetic patients without CLD were studied as controls. Results Although GA was strongly correlated with HbA1C in patients with CLD as well as diabetic patients, GA levels in patients with CLD were relatively higher than those in diabetic patients. In patients with estimated HbA1C ≤5.8%, GA levels significantly increased but HbA1C levels decreased as a function of decreasing hepaplastin test (HPT). The ratio of GA/HbA1C (G/H ratio) increased as a function of decreasing HPT. In patients with estimated HbA1C >5.8%, in contrast, GA levels were independent of HPT levels. In the patients with CLD, GA and HbA1C were associated with mean plasma glucose levels and some indicators for hepatic function. The multivariate analysis revealed a significant association of G/H ratio with HPT, cholinesterase and direct bilirubin. The G/H ratio was not associated with the mean plasma glucose but with HPT and cholinesterase levels. Conclusions The G/H ratio correlates with hepatic function but not with plasma glucose levels. Therefore, CLD should be suspected for diabetic patients with an elevated G/H ratio.

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