In Situ Wet Synthesis of N-ZnO/N-rGO Nanohybrids as an Electrode Material for High-Performance Supercapacitors and Simultaneous Nonenzymatic Electrochemical Sensing of Ascorbic Acid, Dopamine, and Uric Acid at Their Interface

2021 ◽  
Author(s):  
Sahil Thareja ◽  
Anil Kumar
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Electrode Material ◽  
High Performance ◽  
Electrochemical Sensing ◽  
Wet Synthesis

Is idiopathic recurrent calcium urolithiasis in males a cellular disease? Laboratory findings in plasma, urine and erythrocytes, emphasizing the absence and presence of stones, oxidative and mineral metabolism: an observational study

2005 ◽  
Vol 43 (6) ◽  
Author(s):  
Paul Otto Schwille ◽  
Mahimaidos Manoharan ◽  
Angelika Schmiedl
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Plasma Levels ◽  
Mineral Metabolism ◽  
Stone Formation ◽  
Healthy Controls ◽  
Laboratory Findings ◽  
Cross Sectional ◽  
Calcium Urolithiasis

AbstractBackground: The site of origin of idiopathic recurrent calcium urolithiasis (IRCU) – a disorder characterized by stones composed of calcium oxalate (CaOx) and/or calcium phosphate (CaPi) – is uncertain, because in urine such risk factors for stones as disturbed Ox, Ca and Pi are not regularly observed. Aims: To evaluate whether imbalance of antioxidants and oxidants might be present in IRCU patients that is then followed by abnormal urine, plasma and intracellular mineral homeostasis, and stones. Methods: Males were investigated in the laboratory under standardized conditions, and three trials were organized. Trial 1 was cross-sectional, comparing IRCU patients with (n=111) and without stones in situ (n=126), focussing on abnormalities of oxypurines and minerals in urine and plasma, and metabolic activity (MA) of the disease. Trial 2 was partly controlled (n=14 healthy subjects; n=53 IRCU patients), comparing the plasma levels of total antioxidant status (TAS) and uric acid, the major antioxidant in humans, using the subsets Low (n=26) and High (n=27) TAS among IRCU patients in terms of plasma levels of uric acid, ascorbic acid, albumin, α-tocopherol and minerals, urinary minerals, CaOx and CaPi (hydroxyapatite) supersaturation. Trial 3, comprising stone-free IRCU patients (n=8) and healthy controls (n=8), compared minerals and mineral ratios in plasma and red blood cells (RBCs). Established analytical methodologies were used throughout. Results: In trial 1, uricemia, hypoxanthinuria and proteinuria were elevated, fractional urinary clearance (FE) of uric acid was decreased in stone-bearing patients, and MA correlated positively with uricemia and urinary total protein excretion. In trial 2, TAS was significantly decreased in IRCU patients vs. healthy controls; low TAS coincided with low plasma uric acid and albumin, unchanged ascorbic acid, α-tocopherol and parathyroid hormone, but increased FE-uric acid and Pi excretion; the latter correlated negatively with TAS. In trial 3, plasma minerals were significantly decreased in IRCU patients vs. controls, and Ca/Pi, (Ca/Pi)/Mg and (Ca/Pi)/Na molar ratios increased; the latter ratio was also increased in RBCs, and correlated highly positively with the same ratio in plasma. Conclusions: In IRCU 1) renal stones in situ in combination with high fasting uricemia, high hypoxanthinuria and protein-uria, and high MA suggest that a systemic metabolic anomaly underlies stone formation; 2) antioxidant deficit is frequent, unrelated to the presence or absence of stones but apparently related to poor renal uric acid recycling, low uricemia and albuminemia, exaggerated urinary Pi excretion, and low MA; 3) the combination of low plasma TAS, disordered Ca/Pi and other mineral ratios in urine, plasma and RBCs, but unchanged urinary Ca salt supersaturation is compatible with the view that CaPi solid and Ca microlith formation start inside oxidatively damaged cells.

Improved host–guest electrochemical sensing of dopamine in the presence of ascorbic and uric acids in a β-cyclodextrin/Nafion®/polymer nanocomposite

2014 ◽  
Vol 6 (15) ◽  
pp. 5962-5971 ◽  
Author(s):  
Nada F. Atta ◽  
Ahmed Galal ◽  
Shimaa M. Ali ◽  
Dalia M. El-Said
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Gold Electrode ◽  
Polymer Nanocomposite ◽  
Electrochemical Sensing ◽  
Voltammetric Method

A voltammetric method based on a combination of β-cyclodextrin, Nafion® and a gold electrode modified with poly(3,4-ethylene-dioxythiophene) has been successfully developed for the determination of dopamine in the presence of ascorbic acid or uric acid.

Highly Selective Electrochemical Sensing of Dopamine, Xanthine, Ascorbic Acid and Uric Acid Using a Carbon Fiber Paper

2020 ◽  
Vol 20 (19) ◽  
pp. 11707-11712
Author(s):  
Jaligam Murali Mohan ◽  
Khairunnisa Amreen ◽  
Arshad Javed ◽  
Satish Kumar Dubey ◽  
Sanket Goel
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Carbon Fiber ◽  
Electrochemical Sensing ◽  
Carbon Fiber Paper

MoS2-modified graphite felt as a high performance electrode material for zinc–polyiodide redox flow batteries

2019 ◽  
Vol 6 (3) ◽  
pp. 731-735 ◽  
Author(s):  
Jian Liu ◽  
Ting Ma ◽  
Meng Zhou ◽  
Shuang Liu ◽  
Jin Xiao ◽  
...  
Keyword(s):  
Electrode Material ◽  
High Performance ◽  
Graphite Felt ◽  
Redox Flow Batteries ◽  
Flow Batteries

MoS2 nanoplates were in situ grafted onto graphite felt to enable high performance zinc–polyiodine redox flow batteries.

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