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Noreen A, Anwar Z, Ahsan Ejaz M, Usmani M, Khan T, Ali Sheraz M, Ahmed S, Mirza T, Khurshid A, Ahmad I. Riboflavin (vitamin B 2) sensitized photooxidation of ascorbic acid (vitamin C): A kinetic study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 309:123813. [PMID: 38198998 DOI: 10.1016/j.saa.2023.123813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 12/01/2023] [Accepted: 12/23/2023] [Indexed: 01/12/2024]
Abstract
Ascorbic acid (AH2) photoxidation sensitized by riboflavin (RF) has been studied between pH 2.0 and 12.0 in ambient air and anaerobic environment using UV and visible irradiation sources. The kinetics of AH2 degradation in aqueous medium along with RF is found to be first-order for its photodegradation. AH2 photolysis rate constants in aerobic and anaerobic conditions with RF (1.0-5.0 × 10-5 M) are 0.14-3.89 × 10-2 and 0.026-0.740 × 10-2 min-1, respectively. The rate constants (k2) of second-order kinetics for AH2 and RF photochemical interaction in aerobic and anaerobic conditions are in the range of 0.24-3.70 to 0.05-0.70 × 10-3 M-1 min-1, respectively, which manifests that increasing the RF concentration also increases the rate of photodegradation (photooxidation) of AH2. The k2 versus pH graph is bell-shaped which indicates that increasing the pH increases photolytic degradation rate of AH2 with RF. Increasing the pH results in the increased ionization of AH2 (ascorbyl anion, AH-) and redox potential which leads to the higher rates of photodegradation of AH2. Two-component spectrophotometric (243 and 266 nm, AH2 and RF, respectively) and high-performance liquid chromatography (HPLC) methods have been used to determine the concentration of AH2 and RF in pure and degraded solutions. The results obtained from these two methods are compared using a student t-test which showed no noteworthy difference between them.
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Affiliation(s)
- Aisha Noreen
- Department of Pharmaceutical Chemistry, Baqai Institute of Pharmaceutical Sciences, Baqai Medical University, Gadap Road, Super Highway, Karachi 75340, Pakistan
| | - Zubair Anwar
- Department of Pharmaceutical Chemistry, Baqai Institute of Pharmaceutical Sciences, Baqai Medical University, Gadap Road, Super Highway, Karachi 75340, Pakistan.
| | - Muhammad Ahsan Ejaz
- Department of Pharmaceutical Chemistry, Baqai Institute of Pharmaceutical Sciences, Baqai Medical University, Gadap Road, Super Highway, Karachi 75340, Pakistan
| | - Muneeba Usmani
- Department of Pharmaceutics, Baqai Institute of Pharmaceutical Sciences, Baqai Medical University, Gadap Road, Super Highway, Karachi 75340, Pakistan
| | - Tooba Khan
- Department of Pharmaceutical Chemistry, Baqai Institute of Pharmaceutical Sciences, Baqai Medical University, Gadap Road, Super Highway, Karachi 75340, Pakistan; Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Sindh, Allama I.I., Kazi Campus, Jamshoro 76080, Sindh, Pakistan
| | - Muhammad Ali Sheraz
- Department of Pharmaceutics, Baqai Institute of Pharmaceutical Sciences, Baqai Medical University, Gadap Road, Super Highway, Karachi 75340, Pakistan
| | - Sofia Ahmed
- Department of Pharmaceutics, Baqai Institute of Pharmaceutical Sciences, Baqai Medical University, Gadap Road, Super Highway, Karachi 75340, Pakistan
| | - Tania Mirza
- Department of Pharmaceutical Chemistry, Baqai Institute of Pharmaceutical Sciences, Baqai Medical University, Gadap Road, Super Highway, Karachi 75340, Pakistan
| | - Adeela Khurshid
- Department of Pharmaceutics, Baqai Institute of Pharmaceutical Sciences, Baqai Medical University, Gadap Road, Super Highway, Karachi 75340, Pakistan
| | - Iqbal Ahmad
- Department of Pharmaceutical Chemistry, Baqai Institute of Pharmaceutical Sciences, Baqai Medical University, Gadap Road, Super Highway, Karachi 75340, Pakistan
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Oudman E, Wijnia JW, Severs D, Oey MJ, van Dam M, van Dorp M, Postma A. Wernicke's Encephalopathy in Acute and Chronic Kidney Disease: A Systematic Review. J Ren Nutr 2024; 34:105-114. [PMID: 37838073 DOI: 10.1053/j.jrn.2023.10.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 08/02/2023] [Accepted: 10/08/2023] [Indexed: 10/16/2023] Open
Abstract
Thiamine (vitamin B1) deficiency is relatively common in patients with kidney disease. Wernicke's encephalopathy (WE) is caused by vitamin B1 deficiency. Our aim was to systematically review the signs and symptoms of WE in patients with kidney disease. We conducted a systematic literature review on WE in kidney disease and recorded clinical and radiographic characteristics, treatment and outcome. In total 323 manuscripts were reviewed, which yielded 46 cases diagnosed with acute and chronic kidney disease and WE published in 37 reports. Prodromal characteristics of WE were loss of appetite, vomiting, weight loss, abdominal pain, and diarrhea. Parenteral thiamine 500 mg 3 times per day often led to full recovery, while Korsakoff's syndrome was found in those receiving low doses. To prevent WE in kidney failure, we suggest administering high doses of parenteral thiamine in patients with kidney disease who present with severe malnutrition and (prodromal) signs of thiamine deficiency.
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Affiliation(s)
- Erik Oudman
- Experimental Psychology, Helmholtz Institute, Utrecht University, The Netherlands; Slingedael Center of Expertise for Korsakoff Syndrome, Lelie Care Group, Rotterdam, The Netherlands.
| | - Jan W Wijnia
- Experimental Psychology, Helmholtz Institute, Utrecht University, The Netherlands; Slingedael Center of Expertise for Korsakoff Syndrome, Lelie Care Group, Rotterdam, The Netherlands
| | - David Severs
- Division of Nephrology and Transplantation, Department of Internal Medicine, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Misha J Oey
- Experimental Psychology, Helmholtz Institute, Utrecht University, The Netherlands; Slingedael Center of Expertise for Korsakoff Syndrome, Lelie Care Group, Rotterdam, The Netherlands
| | - Mirjam van Dam
- Experimental Psychology, Helmholtz Institute, Utrecht University, The Netherlands; Slingedael Center of Expertise for Korsakoff Syndrome, Lelie Care Group, Rotterdam, The Netherlands
| | - Maaike van Dorp
- Experimental Psychology, Helmholtz Institute, Utrecht University, The Netherlands; Slingedael Center of Expertise for Korsakoff Syndrome, Lelie Care Group, Rotterdam, The Netherlands
| | - Albert Postma
- Experimental Psychology, Helmholtz Institute, Utrecht University, The Netherlands; Slingedael Center of Expertise for Korsakoff Syndrome, Lelie Care Group, Rotterdam, The Netherlands
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Villacieros-Álvarez J, Chicharro P, Trillo S, Barbosa A. Encefalopatía de Wernicke-escorbuto, ¿una asociación infradiagnosticada? Neurologia 2020; 35:47-49. [DOI: 10.1016/j.nrl.2017.05.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 05/04/2017] [Accepted: 05/11/2017] [Indexed: 10/19/2022] Open
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Villacieros-Álvarez J, Chicharro P, Trillo S, Barbosa A. Scurvy and Wernicke's encephalopathy: An underdiagnosed association? NEUROLOGÍA (ENGLISH EDITION) 2020. [DOI: 10.1016/j.nrleng.2019.02.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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Ballaz SJ, Rebec GV. Neurobiology of vitamin C: Expanding the focus from antioxidant to endogenous neuromodulator. Pharmacol Res 2019; 146:104321. [PMID: 31229562 DOI: 10.1016/j.phrs.2019.104321] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 06/16/2019] [Accepted: 06/18/2019] [Indexed: 01/06/2023]
Abstract
Ascorbic acid (AA) is a water-soluble vitamin (C) found in all bodily organs. Most mammals synthesize it, humans are required to eat it, but all mammals need it for healthy functioning. AA reaches its highest concentration in the brain where both neurons and glia rely on tightly regulated uptake from blood via the glucose transport system and sodium-coupled active transport to accumulate and maintain AA at millimolar levels. As a prototype antioxidant, AA is not only neuroprotective, but also functions as a cofactor in redox-coupled reactions essential for the synthesis of neurotransmitters (e.g., dopamine and norepinephrine) and paracrine lipid mediators (e.g., epoxiecoisatrienoic acids) as well as the epigenetic regulation of DNA. Although redox capacity led to the promotion of AA in high doses as potential treatment for various neuropathological and psychiatric conditions, ample evidence has not supported this therapeutic strategy. Here, we focus on some long-neglected aspects of AA neurobiology, including its modulatory role in synaptic transmission as demonstrated by the long-established link between release of endogenous AA in brain extracellular fluid and the clearance of glutamate, an excitatory amino acid. Evidence that this link can be disrupted in animal models of Huntington´s disease is revealing opportunities for new research pathways and therapeutic applications (e.g., epilepsy and pain management). In fact, we suggest that improved understanding of the regulation of endogenous AA and its interaction with key brain neurotransmitter systems, rather than administration of AA in excess, should be the target of future brain-based therapies.
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Affiliation(s)
- Santiago J Ballaz
- School of Biological Sciences and Engineering, Yachay Tech University, Urcuqui, Ecuador.
| | - George V Rebec
- Program in Neuroscience, Department Psychological & Brain Sciences, Indiana University, Bloomington, USA.
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Vitamin C Can Shorten the Length of Stay in the ICU: A Meta-Analysis. Nutrients 2019; 11:nu11040708. [PMID: 30934660 PMCID: PMC6521194 DOI: 10.3390/nu11040708] [Citation(s) in RCA: 148] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 03/12/2019] [Accepted: 03/18/2019] [Indexed: 12/12/2022] Open
Abstract
A number of controlled trials have previously found that in some contexts, vitamin C can have beneficial effects on blood pressure, infections, bronchoconstriction, atrial fibrillation, and acute kidney injury. However, the practical significance of these effects is not clear. The purpose of this meta-analysis was to evaluate whether vitamin C has an effect on the practical outcomes: length of stay in the intensive care unit (ICU) and duration of mechanical ventilation. We identified 18 relevant controlled trials with a total of 2004 patients, 13 of which investigated patients undergoing elective cardiac surgery. We carried out the meta-analysis using the inverse variance, fixed effect options, using the ratio of means scale. In 12 trials with 1766 patients, vitamin C reduced the length of ICU stay on average by 7.8% (95% CI: 4.2% to 11.2%; p = 0.00003). In six trials, orally administered vitamin C in doses of 1⁻3 g/day (weighted mean 2.0 g/day) reduced the length of ICU stay by 8.6% (p = 0.003). In three trials in which patients needed mechanical ventilation for over 24 hours, vitamin C shortened the duration of mechanical ventilation by 18.2% (95% CI 7.7% to 27%; p = 0.001). Given the insignificant cost of vitamin C, even an 8% reduction in ICU stay is worth exploring. The effects of vitamin C on ICU patients should be investigated in more detail.
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Abstract
OBJECTIVE To report a case of Parkinsonism rapidly responsive to intravenous replacement of vitamin C and zinc. CASE SUMMARY A 66-year-old man with Parkinsonism, pleural effusion, and bipolar disorder was found to have low serum vitamin C and zinc levels. Intravenous replacement of these micronutrients led to resolution of the movement disorder in less than 24 hours. DISCUSSION Parkinsonism has been associated with vitamin C deficiency, and recent cases of scurvy complicated by Parkinsonism have responded well to intravenous replacement of vitamin C. In this case, deficiency of zinc may have contributed to the development of a movement disorder. The likely pathophysiology of, and treatment recommendations for, Parkinsonism linked to deficiencies of vitamin C and zinc are reviewed. CONCLUSIONS Whereas vitamin C has a strong link with Parkinsonism, the potential role of zinc has only been suspected. This case report highlights some of the potential links between zinc deficiency and Parkinsonism.
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Affiliation(s)
- Martha J Quiroga
- University of Texas Health Science Center at San Antonio, TX, USA
| | - David W Carroll
- Audie L. Murphy Memorial Veterans Administration Center, San Antonio, TX, USA
| | - Thomas M Brown
- Audie L. Murphy Memorial Veterans Administration Center, San Antonio, TX, USA
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Brown TM. Neuropsychiatric scurvy. PSYCHOSOMATICS 2014; 56:12-20. [PMID: 25619670 DOI: 10.1016/j.psym.2014.05.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 03/29/2014] [Accepted: 03/31/2014] [Indexed: 11/18/2022]
Abstract
BACKGROUND Scurvy is a disease with well-known peripheral symptoms, such as bleeding and pain. METHODS The clinical and historical evidence for a distinct form of scurvy affecting the central nervous system, called neuropsychiatric scurvy, is reviewed. Pathophysiologic factors are described, as well as its diagnosis and management.
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Affiliation(s)
- Thomas M Brown
- Audie L. Murphy Memorial Veterans Administration Center, San Antonio, TX.
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Volz H, Gerardi M, Brown TM, Carroll DW. Ectopia lentis, "the sign of the tremulous iris," and hypovitaminosis C: a classic eye finding with a neuropsychiatric twist. PSYCHOSOMATICS 2014; 55:82-86. [PMID: 24314592 DOI: 10.1016/j.psym.2013.08.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 08/15/2013] [Accepted: 08/16/2013] [Indexed: 06/02/2023]
Affiliation(s)
- Holly Volz
- School of Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX
| | - Margit Gerardi
- School of Nursing, University of Texas Health Science Center at San Antonio, San Antonio, TX
| | - Thomas M Brown
- Department of Psychiatry, Audie L. Murphy Memorial VAMC, San Antonio, TX.
| | - David W Carroll
- Department of Psychiatry, Audie L. Murphy Memorial VAMC, San Antonio, TX
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Wright AD, Stevens E, Ali M, Carroll DW, Brown TM. The neuropsychiatry of scurvy. PSYCHOSOMATICS 2013; 55:179-85. [PMID: 24365538 DOI: 10.1016/j.psym.2013.10.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 10/07/2013] [Accepted: 10/08/2013] [Indexed: 12/17/2022]
Affiliation(s)
| | - Elizabeth Stevens
- University of Texas Health Science Center at San Antonio, San Antonio, TX
| | - Maysun Ali
- University of Texas Health Science Center at San Antonio, San Antonio, TX
| | - David W Carroll
- Audie L. Murphy Memorial Veterans Administration Center, San Antonio, TX
| | - Thomas M Brown
- Audie L. Murphy Memorial Veterans Administration Center, San Antonio, TX.
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