Challenges and Strategies in Developing an Enzymatic Wearable Sweat Glucose Biosensor as a Practical Point-Of-Care Monitoring Tool for Type II Diabetes

Recently, several studies have been conducted on wearable biosensors. Despite being skin-adhesive and mountable diagnostic devices, flexible biosensor patches cannot truly be considered wearable biosensors if they need to be connected to external instruments/processors to provide meaningful data/readings. A realistic and usable wearable biosensor should be self-contained, with a fully integrated device framework carefully designed and configured to provide reliable and intelligent diagnostics. There are several major challenges to achieving continuous sweat monitoring in real time for the systematic and effective management of type II diabetes (e.g., prevention, screening, monitoring, and treatment) through wearable sweat glucose biosensors. Consequently, further in-depth research regarding the exact interrelationship between active or passive sweat glucose and blood glucose is required to assess the applicability of wearable glucose biosensors in functional health monitoring. This review provides some useful insights that can enable effective critical studies of these unresolved issues. In this review, we first classify wearable glucose biosensors based on their signal transduction, their respective challenges, and the advanced strategies required to overcome them. Subsequently, the challenges and limitations of enzymatic and non-enzymatic wearable glucose biosensors are discussed and compared. Ten basic criteria to be considered and fulfilled in the development of a suitable, workable, and wearable sweat-based glucose biosensor are listed, based on scientific reports from the last five years. We conclude with our outlook for the controllable, well-defined, and non-invasive monitoring of epidermal glucose for maximum diagnostic potential in the effective management of type II diabetes.

Electrospun porous La-Sr-Co-Ni-O nanofibers for highly sensitive non-enzymatic glucose detection

Glucose biosensors are widely used for clinical, industrial, and environmental applications. Nonenzymatic electrochemical glucose biosensors based on metal oxides with a perovskite structure have exhibited high sensitivity, excellent stability, and...

Design and Development of Advanced Glucose Biosensors via Tuned Interactions between Marine Polysaccharides and Diagnostic Elements – A Survey

Extensive scientific analysis on the susceptibility of different populations to COVID-19 highlights that compared to populations with no co-morbidities, people with co-morbidities such as diabetes mellitus (DM) are at a significantly higher risk of serious infection, hospitalization, or even death. This underscores the importance of controlling DM through self-monitoring of blood glucose (SMBG) or continuous glucose monitoring (CGM) using biosensors. These biosensors, which can be either enzymatic or non-enzymatic, have undergone several rounds of development in terms of the materials used for device construction. In terms of the immobilization agent needed to anchor enzymatic or non-enzymatic detection elements to the electrode surface, marine polysaccharides, such as chitosan and alginate, hold a distinct advantage. This, in turn, can be ascribed to their biocompatibility, chemical stability, film-forming ability, capacity to bind with enzymes/diagnostic elements, and easy availability. In this review, we focus extensively on the use of cationic chitosan and anionic alginate in the past decade for designing advanced glucose biosensors. Their role in enhancing sensor response via physical/chemical interactions with the conducting and diagnostic elements is analyzed in detail from a structural point of view. In addition, the possibility of using these polysaccharides in non-invasive CGM sensors is discussed and several potential future research avenues are presented.

Biosensing Membrane Base on Ferulic Acid and Glucose Oxidase for an Amperometric Glucose Biosensor

A biosensing membrane base on ferulic acid and glucose oxidase is synthesized onto a carbon paste electrode by electropolymerization via cyclic voltammetry in aqueous media at neutral pH at a single step. The developed biosensors exhibit a linear response from 0.082 to 34 mM glucose concentration, with a coefficient of determination R2 equal to 0.997. The biosensors display a sensitivity of 1.1 μAmM−1 cm−2, a detection limit of 0.025 mM, and 0.082 mM as glucose quantification limit. The studies reveal stable, repeatable, and reproducible biosensors response. The results indicate that the novel poly-ferulic acid membrane synthesized by electropolymerization is a promising method for glucose oxidase immobilization towards the development of glucose biosensors. The developed glucose biosensors exhibit a broader linear glucose response than other polymer-based glucose biosensors.

Glucose biosensors for Diabetes Mellitus management

Diabetes mellitus is one of the common endocrine disorder of the recent times with increasing mortality and morbidity worldwide. Blood glucose monitoring is one of the essential methods of management of Diabetes Mellitus. The use of biosensors in blood glucose monitoring is now becoming one of the essential tools. The development and improvement of devices such as continuous glucose monitoring and non-invasive glucose monitoring system has led to the ease of blood glucose monitoring. The three main components of the device include the biological recognition element, transducer and a signal processing system. Currently most of the glucose biosensors are of the electrochemical type which has better sensitivity and better reproducibility. The glucose measurement is mostly based on the interaction with one of the three enzymes, glucose oxidase (GOx), hexokinase and glucose-1-dehydrogenase (GDH) and the product is quantified by the processing system. Self-assessment through glucose biosensors is becoming cost effective with increasing patient compliance as it is decreasing the need for expensive laboratory tests. Moreover, the evolution Saliva Glucose Biosensors where blood glucose can be easily recorded through smartphones are now in trending. The major challenges are maintaining the precision and accuracy of the biosensors, standardization, continuous assessment and training of the lay users.