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Park JM, Koh JH, Kim JM. Determination of L-Carnitine in Infant Powdered Milk Samples after Derivatization. Food Sci Anim Resour 2021; 41:731-738. [PMID: 34291219 PMCID: PMC8277179 DOI: 10.5851/kosfa.2021.e23] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 04/21/2021] [Accepted: 04/24/2021] [Indexed: 11/22/2022] Open
Abstract
Herein, a novel analytical method using a high-performance liquid
chromatography-fluorescence detector (HPLC/FLD) is developed for rapidly
measuring an L-carnitine ester derivative in infant powdered milk. In this
study, solid-phase extraction cartridges filled with derivatized methanol and
distilled water were used to effectively separate L-carnitine. Protein
precipitation pretreatment was carried out to remove the protein and recover the
analyte extract with a high recovery (97.16%–106.56%),
following which carnitine in the formula was derivatized to its ester form.
Precolumn derivation with 1-aminoanthracene (1AA) was carried out in a phosphate
buffer using 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC)
as the catalyst. Method validation was performed following the AOAC guidelines.
The calibration curves were linear in the L-carnitine concentration range of
0.1–2.5 mg/L. The lower limit of quantitation and limit of detection of
L-carnitine were 0.076 and 0.024 mg/L, respectively. The intra- and interday
precision and recovery results were within the allowable limits. The results
showed that our method helped reduce the sample preparation time. It also
afforded higher resolution and better reproducibility than those obtained by
traditional methods. Our method is suitable for detecting the quantity of
L-carnitine in infant powdered milk containing a large amount of protein or
starch.
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Affiliation(s)
- Jung Min Park
- Department of Food Marketing and Safety, Konkuk University, Seoul 05029, Korea
| | - Jong Ho Koh
- Department of Bio-Food Analysis, Bio-Campus, Korea Polytechnic College, Nonsan 32940, Korea
| | - Jin Man Kim
- Department of Food Marketing and Safety, Konkuk University, Seoul 05029, Korea
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2
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Lü Z, Gong L, Ren Y, Chen Y, Wang Z, Liu L, Li H, Chen X, Li Z, Luo H, Jiang H, Zeng Y, Wang Y, Wang K, Zhang C, Jiang H, Wan W, Qin Y, Zhang J, Zhu L, Shi W, He S, Mao B, Wang W, Kong X, Li Y. Large-scale sequencing of flatfish genomes provides insights into the polyphyletic origin of their specialized body plan. Nat Genet 2021; 53:742-751. [PMID: 33875864 PMCID: PMC8110480 DOI: 10.1038/s41588-021-00836-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 03/05/2021] [Indexed: 11/09/2022]
Abstract
The evolutionary and genetic origins of the specialized body plan of flatfish are largely unclear. We analyzed the genomes of 11 flatfish species representing 9 of the 14 Pleuronectiforme families and conclude that Pleuronectoidei and Psettodoidei do not form a monophyletic group, suggesting independent origins from different percoid ancestors. Genomic and transcriptomic data indicate that genes related to WNT and retinoic acid pathways, hampered musculature and reduced lipids might have functioned in the evolution of the specialized body plan of Pleuronectoidei. Evolution of Psettodoidei involved similar but not identical genes. Our work provides valuable resources and insights for understanding the genetic origins of the unusual body plan of flatfishes.
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Affiliation(s)
- Zhenming Lü
- National Engineering Laboratory of Marine Germplasm Resources Exploration and Utilization, Zhejiang Ocean University, Zhoushan, China
| | - Li Gong
- National Engineering Laboratory of Marine Germplasm Resources Exploration and Utilization, Zhejiang Ocean University, Zhoushan, China
| | - Yandong Ren
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an, China
| | - Yongjiu Chen
- National Engineering Laboratory of Marine Germplasm Resources Exploration and Utilization, Zhejiang Ocean University, Zhoushan, China
| | - Zhongkai Wang
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an, China
| | - Liqin Liu
- National Engineering Laboratory of Marine Germplasm Resources Exploration and Utilization, Zhejiang Ocean University, Zhoushan, China
| | - Haorong Li
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an, China
| | - Xianqing Chen
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an, China
| | - Zhenzhu Li
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an, China
| | - Hairong Luo
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
| | - Hui Jiang
- National Engineering Laboratory of Marine Germplasm Resources Exploration and Utilization, Zhejiang Ocean University, Zhoushan, China
| | - Yan Zeng
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China
| | - Yifan Wang
- National Engineering Laboratory of Marine Germplasm Resources Exploration and Utilization, Zhejiang Ocean University, Zhoushan, China
| | - Kun Wang
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an, China
| | - Chen Zhang
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an, China
| | - Haifeng Jiang
- Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
| | - Wenting Wan
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an, China
| | - Yanli Qin
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an, China
| | - Jianshe Zhang
- National Engineering Laboratory of Marine Germplasm Resources Exploration and Utilization, Zhejiang Ocean University, Zhoushan, China
| | - Liang Zhu
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China
| | - Wei Shi
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
| | - Shunping He
- Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
| | - Bingyu Mao
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China
| | - Wen Wang
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an, China.
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China.
- Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming, China.
| | - Xiaoyu Kong
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China.
| | - Yongxin Li
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an, China.
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China.
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3
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Blázquez-Moraleja A, Sáenz-de-Santa María I, Chiara MD, Álvarez-Fernández D, García-Moreno I, Prieto-Montero R, Martínez-Martínez V, López Arbeloa I, Chiara JL. Shedding light on the mitochondrial matrix through a functional membrane transporter. Chem Sci 2019; 11:1052-1065. [PMID: 34084361 PMCID: PMC8146229 DOI: 10.1039/c9sc04852a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
The first fluorescent probes that are actively channeled into the mitochondrial matrix by a specific mitochondrial membrane transporter in living cells have been developed. The new functional probes (BCT) have a minimalist structural design based on the highly efficient and photostable BODIPY chromophore and carnitine as a biotargeting element. Both units are orthogonally bonded through the common boron atom, thus avoiding the use of complex polyatomic connectors. In contrast to known mitochondria-specific dyes, BCTs selectively label these organelles regardless of their transmembrane potential and in an enantioselective way. The obtained experimental evidence supports carnitine–acylcarnitine translocase (CACT) as the key transporter protein for BCTs, which behave therefore as acylcarnitine biomimetics. This simple structural design can be readily extended to other structurally diverse starting F-BODIPYs to obtain BCTs with varied emission wavelengths along the visible and NIR spectral regions and with multifunctional capabilities. BCTs are the first fluorescent derivatives of carnitine to be used in cell microscopy and stand as promising research tools to explore the role of the carnitine shuttle system in cancer and metabolic diseases. Extension of this approach to other small-molecule mitochondrial transporters is envisaged. A BODIPY derivative of carnitine enters mitochondria regardless of their membrane potential and in an enantioselective way through a specific mitochondrial membrane transporter in living cells.![]()
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Affiliation(s)
| | - Ines Sáenz-de-Santa María
- Instituto de Investigación Sanitaria del Principado de Asturias, Instituto de Oncología del Principado de Asturias (IUOPA), CIBERONC, Universidad de Oviedo, Hospital Central de Asturias 33011 Oviedo Spain
| | - María D Chiara
- Instituto de Investigación Sanitaria del Principado de Asturias, Instituto de Oncología del Principado de Asturias (IUOPA), CIBERONC, Universidad de Oviedo, Hospital Central de Asturias 33011 Oviedo Spain
| | | | | | - Ruth Prieto-Montero
- Departamento de Química Física, Universidad del País Vasco UPV-EHU, Facultad de Ciencia y Tecnología Apartado 644 48080 Bilbao Spain
| | - Virginia Martínez-Martínez
- Departamento de Química Física, Universidad del País Vasco UPV-EHU, Facultad de Ciencia y Tecnología Apartado 644 48080 Bilbao Spain
| | - Iñigo López Arbeloa
- Departamento de Química Física, Universidad del País Vasco UPV-EHU, Facultad de Ciencia y Tecnología Apartado 644 48080 Bilbao Spain
| | - Jose Luis Chiara
- Instituto de Química Orgánica General (IQOG-CSIC) Juan de la Cierva 3 28006 Madrid Spain
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4
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Abd El-Rahman MK, Mazzone G, Mahmoud AM, Sicilia E, Shoeib T. Spectrophotometric determination of choline in pharmaceutical formulations via host-guest complexation with a biomimetic calixarene receptor. Microchem J 2019. [DOI: 10.1016/j.microc.2019.01.046] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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5
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Li S, Gao D, Jiang Y. Function, Detection and Alteration of Acylcarnitine Metabolism in Hepatocellular Carcinoma. Metabolites 2019; 9:E36. [PMID: 30795537 PMCID: PMC6410233 DOI: 10.3390/metabo9020036] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Revised: 02/07/2019] [Accepted: 02/14/2019] [Indexed: 01/01/2023] Open
Abstract
Acylcarnitines play an essential role in regulating the balance of intracellular sugar and lipid metabolism. They serve as carriers to transport activated long-chain fatty acids into mitochondria for β-oxidation as a major source of energy for cell activities. The liver is the most important organ for endogenous carnitine synthesis and metabolism. Hepatocellular carcinoma (HCC), a primary malignancy of the live with poor prognosis, may strongly influence the level of acylcarnitines. In this paper, the function, detection and alteration of acylcarnitine metabolism in HCC were briefly reviewed. An overview was provided to introduce the metabolic roles of acylcarnitines involved in fatty acid β-oxidation. Then different analytical platforms and methodologies were also briefly summarised. The relationship between HCC and acylcarnitine metabolism was described. Many of the studies reported that short, medium and long-chain acylcarnitines were altered in HCC patients. These findings presented current evidence in support of acylcarnitines as new candidate biomarkers for studies on the pathogenesis and development of HCC. Finally we discussed the challenges and perspectives of exploiting acylcarnitine metabolism and its related metabolic pathways as a target for HCC diagnosis and prognosis.
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Affiliation(s)
- Shangfu Li
- State Key Laboratory of Chemical Oncogenomics, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
- National & Local United Engineering Lab for Personalized Anti-tumour Drugs, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
| | - Dan Gao
- State Key Laboratory of Chemical Oncogenomics, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
- National & Local United Engineering Lab for Personalized Anti-tumour Drugs, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
- Key Laboratory of Metabolomics at Shenzhen, Shenzhen 518055, China.
| | - Yuyang Jiang
- State Key Laboratory of Chemical Oncogenomics, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
- School of Pharmaceutical Sciences, Tsinghua University, Beijing 100084, China.
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6
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Novel Competitive Fluorescence Sensing Platform for L-carnitine Based on Cationic Pillar[5]Arene Modified Gold Nanoparticles. SENSORS 2018; 18:s18113927. [PMID: 30441777 PMCID: PMC6263671 DOI: 10.3390/s18113927] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 11/04/2018] [Accepted: 11/08/2018] [Indexed: 11/17/2022]
Abstract
Supramolecular host-guest interaction and sensing between cationic pillar[5]arenes (CP5) and L-carnitine were developed by the competitive host-guest recognition for the first time. The fluorescence sensing platform was constructed by CP5 functionalized Au nanoparticles (CP5@Au-NPs) as receptor and probe (rhodamine 123, R123), which shown high sensitivity and selectivity for L-carnitine detection. Due to the negative charge and molecular size properties of L-carnitine, it can be highly captured by the CP5 via electrostatic interactions and hydrophobic interactions. The host-guest mechanism between PP5 and L-carnitine was studied by 1H NMR and molecular docking, indicating that more affinity binding force of CP5 with L-carnitine. Therefore, a selective and sensitive fluorescent method was developed. It has a linear response of 0.1–2.0 and 2.0–25.0 μM and a detection limit of 0.067 μM (S/N = 3). The fluorescent sensing platform was also used to detect L-carnitine in human serum and milk samples, which provided potential applications for the detection of drugs abuse and had path for guarding a serious food safety issues.
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7
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Analytical approaches to determination of carnitine in biological materials, foods and dietary supplements. Food Chem 2014; 142:220-32. [DOI: 10.1016/j.foodchem.2013.06.137] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Revised: 05/24/2013] [Accepted: 06/26/2013] [Indexed: 12/30/2022]
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8
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Wang MH, Gu JA, Mani V, Wu YC, Lin YJ, Chia YM, Huang ST. A rapid fluorescence detecting platform: applicable to sense carnitine and chloramphenicol in food samples. RSC Adv 2014. [DOI: 10.1039/c4ra11449c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A new long-wavelength latent florescent probe, termed “BCC” for sensitive determination of coenzyme A, carnitine and chloramphenicol.
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Affiliation(s)
- Ming-Hui Wang
- Department of Chemical Engineering and Biotechnology
- National Taipei University of Technology
- Taipei 10608, Taiwan
| | - Jiun-An Gu
- Department of Chemical Engineering and Biotechnology
- National Taipei University of Technology
- Taipei 10608, Taiwan
| | - Veerappan Mani
- Department of Chemical Engineering and Biotechnology
- National Taipei University of Technology
- Taipei 10608, Taiwan
| | - Yung-Chao Wu
- Institue of Biochemical and Biomedical Engineering
- National Taipei University of Technology
- Taipei 10608, Taiwan
| | - Yu-Jen Lin
- Department of Chemical Engineering and Biotechnology
- National Taipei University of Technology
- Taipei 10608, Taiwan
| | - Yu-Ming Chia
- Department of Chemical Engineering and Biotechnology
- National Taipei University of Technology
- Taipei 10608, Taiwan
| | - Sheng-Tung Huang
- Department of Chemical Engineering and Biotechnology
- National Taipei University of Technology
- Taipei 10608, Taiwan
- Institue of Biochemical and Biomedical Engineering
- National Taipei University of Technology
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9
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Mansour FR, Wei W, Danielson ND. Separation of carnitine and acylcarnitines in biological samples: a review. Biomed Chromatogr 2013; 27:1339-53. [PMID: 24006302 DOI: 10.1002/bmc.2995] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2013] [Revised: 06/13/2013] [Accepted: 06/14/2013] [Indexed: 12/30/2022]
Abstract
Carnitine and its acylesters are a family of compounds that can be used in the early diagnosis of many diseases. Carnitine and acylcarnitines have a crucial role in fatty acid transportation. The increased level of free carnitine, total carnitine, or the acylesters can act as biomarkers for many metabolic disorders, including diabetes, encephalopathy and cardiomyopathy. The determination of these compounds is difficult owing to the simple aliphatic structure, the chiral center and the permanent positive charge. Although MS detection can be enough to differentiate between some carnitine derivatives, closely related structural isomers of the acylcarnitines must be separated before detection because they form the same base peak and second most abundant ion peak. Different separation methods are discussed in this review, including reversed-phase, hydrophilic interaction, ion exchange, ion pairing, mixed mode liquid chromatography, gas chromatography and electrophoresis. Representative example chromatograms are shown. The sample preparation and the different derivatization reactions are also covered. A table that summarizes the most important analytical methods by detailing the analyte mixture, the sample matrix, the separation mode and the detection method is provided.
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Affiliation(s)
- Fotouh R Mansour
- Department of Pharmaceutical Analytical Chemistry, Tanta University, Tanta, 31111, Egypt
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10
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11
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Özogul Y, Kuley Boga E, Özogul F, Ayas D. L-Carnitine Contents in Seafoods Commonly Eaten in Middle Eastern Countries. J Food Biochem 2012. [DOI: 10.1111/j.1745-4514.2012.00668.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yesim Özogul
- Department of Seafood Processing Technology; Faculty of Fisheries, University of Cukurova; Adana Turkey
| | - Esmeray Kuley Boga
- Department of Seafood Processing Technology; Faculty of Fisheries, University of Cukurova; Adana Turkey
| | - Fatih Özogul
- Department of Seafood Processing Technology; Faculty of Fisheries, University of Cukurova; Adana Turkey
| | - Deniz Ayas
- Department of Seafood Processing Technology; Faculty of Fisheries, University of Mersin; Mersin 33169 Turkey
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12
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Cao Y, Qu HJ, Li P, Wang CB, Wang LX, Han ZW. Single dose administration of L-carnitine improves antioxidant activities in healthy subjects. TOHOKU J EXP MED 2012; 224:209-13. [PMID: 21701126 DOI: 10.1620/tjem.224.209] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
L-carnitine has been used as a supplement to treat cardiovascular or liver disease. However, there has been little information about the effect of L-carnitine on anti-oxidation capability in healthy human subjects. This study was designed to investigate the correlation between plasma L-carnitine concentration and antioxidant activity. Liquid L-carnitine (2.0 g) was administered orally as a single dose in 12 healthy subjects. Plasma concentration of L-carnitine was detected by HPLC. The baseline concentration of L-carnitine was 39.14 ± 5.65 µmol/L. After single oral administration, the maximum plasma concentration (C(max)) and area under the curve (AUC(0-∞)) were 84.7 ± 25.2 µmol/L and 2,676.4 ± 708.3 µmol/L·h, respectively. The half-life and the time required to reach the C(max) was 60.3 ± 15.0 min and 3.4 ± 0.46 h, respectively. There was a gradual increase in plasma concentrations of superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), catalase and total antioxidative capacity (T-AOC) in the first 3.5 h following L-carnitine administration. The plasma concentrations of SOD, GSH-Px, catalase and T-AOC returned to baseline levels within 24 h. A positive correlation was found between L-carnitine concentration and the antioxidant index of SOD (r = 0.992, P < 0.01), GSH-Px (r = 0.932, P < 0.01), catalase (r = 0.972, P < 0.01) or T-AOC (r = 0.934, P < 0.01). In conclusion, L-carnitine increases activities of antioxidant enzymes and the total antioxidant capacity in healthy subjects. It may be useful as a supplementary therapy for chronic illnesses involving excessive oxidative stress.
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Affiliation(s)
- Yu Cao
- Department of Pharmacy, the Affiliated Hospital of Medical College, Qingdao University, China
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13
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Mao X, Tian D, Li H. p-Sulfonated calix[6]arene modified graphene as a ‘turn on’ fluorescent probe for l-carnitine in living cells. Chem Commun (Camb) 2012; 48:4851-3. [DOI: 10.1039/c2cc31551c] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Pormsila W, Morand R, Krähenbühl S, Hauser PC. Capillary electrophoresis with contactless conductivity detection for the determination of carnitine and acylcarnitines in clinical samples. J Chromatogr B Analyt Technol Biomed Life Sci 2011; 879:921-6. [DOI: 10.1016/j.jchromb.2011.02.046] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2010] [Revised: 12/21/2010] [Accepted: 02/25/2011] [Indexed: 02/07/2023]
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15
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Rumen bypass and biodistribution of l-carnitine from dual-layered coated pellets in cows, in vitro and in vivo. Int J Pharm 2008; 359:87-93. [DOI: 10.1016/j.ijpharm.2008.03.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2007] [Revised: 02/20/2008] [Accepted: 03/18/2008] [Indexed: 11/22/2022]
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