Eggshell nano-CaCO3 decorated PANi/rGO composite for sensitive determination of ascorbic acid, dopamine, and uric acid in human blood serum and urine

An ultra-sensitive uric acid second generation biosensor based on chemical immobilization of uricase on functionalized multiwall carbon nanotube grafted palm oil fiber in the presence of a ferrocene mediator

“…A comparison of this value with the ones reported in the literature (Table 1) reveals that the bioelectrode developed in this work is highly sensitive for the biosensing of UA. It is noteworthy that the sensitivity and detection limit of the prepared biosensors were much lower than the physiological range (130 to 460 mM) [1][2][3] and also linear beyond the full physiological range, 1 which may be due to the expected synergistic effect of the Fc electron mediator and FMWCNT-POF decorated UOx that enables convenient signal conduction and effective electrocatalytic activity.…”

“…Uric acid (UA) is one of the most important metabolites (metabolic end product of purine) secreted by organisms and is always present in pathological samples. A normal range for UA in human serum is between 130 and 460 mmol L −1 (2.18-7.7 mg dL −1 ), [1][2][3] an excess amount of which can cause illnesses such as gout, hyperuricemia, Lesch-Nyhan syndrome, cardiovascular disease and type-II diabetes. Its low level also causes problems such as oxidative stress and multiple sclerosis in humans.…”

A Simple Flow Injection System for Amperometric Detection of Ascorbic Acid Using Carbon Paste/Copper Schiff Base Composite Electrode

“…Therefore, electrochemical methods proved to be cheaper and easier to manipulate. [8][9][10][11] Carbon paste electrodes (CPEs) have shown versatile role as good electrochemical sensors and biosensors due to their simplicity, compatibility, reproducibility, and ability to be modified with various modifiers. [12,13] The important property of chemically modified electrodes is the ability to catalyze the electrode processes using a significant decrease of overpotential compared to the unmodified (bare) electrodes.…”

“…All these methods have drawbacks regarding high cost, complicated sample preparation, and generation of large amounts of waste. Therefore, electrochemical methods proved to be cheaper and easier to manipulate [8–11] …”

Recycled polyester filled with eggshells waste-based nano CaCO3: thermo-mechanical and flame-retardant features

“…All recorded patterns describe the pure phase of calcite CaCO 3 nanoparticles, according to JCPDS card No. 47-1743 and some reported publications [63][64][65].…”