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Begum M, Saikia R, Saikia SP. Triple quadrupole liquid chromatography-mass spectrometry-mediated evaluation of vitamin D 2 accumulation potential, antioxidant capacities, and total polyphenol content of white jelly mushroom ( Tremella fuciformis Berk.). Mycologia 2024; 116:464-474. [PMID: 38489159 DOI: 10.1080/00275514.2024.2313435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 01/30/2024] [Indexed: 03/17/2024]
Abstract
Tremella fuciformis Berk. (TF), or the white jelly mushroom, is well known for its myriad of pharmacological properties, such as immunomodulatory, anti-inflammatory, antidiabetic, antitumor, and antioxidant activities, and hypocholesterolemic and hepatoprotective effects that boost human health. Most of the studies of TF are concentrated on its polysaccharide (glucuronoxylomannan) composition, which is responsible for its pharmacological as well as rheological properties. It is well established that mushrooms are a great source of dietary vitamin D due to the presence of ergosterol in their cell membrane. There is a lack of published data on TF as a source of vitamin D2. Therefore, this study aimed to evaluate the vitamin D2 composition of the fruiting bodies of TF using triple quadrupole liquid chromatography-mass spectrometry (LC-MS/QQQ). The results showed highest vitamin D2 content (292.02 µg/g dry weight) in the sample irradiated with ultraviolet B (UVB; 310 nm) for 180 min as compared with the control group (52.47 µg/g dry weight) (P ≤ 0.001). The results showed higher accumulation potential of vitamin D2 in TF as compared with published data available for other extensively studied culinary mushrooms, such as Agaricus bisporus, Lentinula edodes, Pleurotus ostreatus, Cordiceps militaris, and Calocybe indica. Moreover, the impact of UV treatment on antioxidant capacities and total polyphenol content of TF was also studied. The accumulation potential of vitamin D in TF reveals a novel commercial source for this nutrient.
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Affiliation(s)
- Marium Begum
- Agrotechnology and Rural Development Division, Council of Scientific and Industrial Research North East Institute of Science and Technology, Jorhat 785006, India
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
| | - Ratul Saikia
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
- Biological Sciences and Technology Division, Council of Scientific and Industrial Research North East Institute of Science and Technology, Jorhat 785006, India
| | - Siddhartha Proteem Saikia
- Agrotechnology and Rural Development Division, Council of Scientific and Industrial Research North East Institute of Science and Technology, Jorhat 785006, India
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
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Ewles M, Ledvina AR, Powers B, Thomas CE. Observations from a decade of oligonucleotide bioanalysis by LC-MS. Bioanalysis 2024. [PMID: 38634379 DOI: 10.4155/bio-2024-0007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/19/2024] Open
Abstract
There is a growing need for efficient bioanalysis of oligonucleotide therapeutics. This broad class of molecules presents numerous challenges relative to traditional small molecule therapeutics. Methodologies including ligand-binding assays or polymerase chain reaction may be fit-for-purpose in many instances, but liquid chromatography coupled to mass spectrometry (LC-MS) often delivers the best balance of sensitivity and selectivity. Over the last decade, we have engaged with many such molecules and derived insights into challenges and solutions. Herein, we provide four case studies illustrating challenges we have encountered. These issues include low or variable analyte recovery, poor resolution from related species, chromatographic abnormalities or challenging sensitivity. We present a summary of considerations, based on these experiences, to assist others working in the area.
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Affiliation(s)
- Matthew Ewles
- Labcorp Early Development Laboratories Limited; Otley Road, Harrogate; North Yorkshire, HG3 1PY, UK
| | - Aaron R Ledvina
- Labcorp Early Development Laboratories, Inc.; 3301 Kinsman Blvd., Madison, WI 53704, USA
| | - Brendan Powers
- Labcorp Early Development Laboratories, Inc.; 3301 Kinsman Blvd., Madison, WI 53704, USA
| | - C Eric Thomas
- Labcorp Central Laboratory Services Limited Partnership; 8211 SciCor Drive, Indianapolis, IN 46214, USA
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Adiraju SK, Sumi CD, Pandey S, Cotta MO, Roberts JA, Lipman J, Wallis SC, Parker SL. Quantification of levetiracetam in plasma and urine and its application to a pharmacokinetic study of traumatic brain injury patients. Bioanalysis 2023. [PMID: 36927087 DOI: 10.4155/bio-2022-0230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023] Open
Abstract
Background: Levetiracetam is an antiepileptic drug used to prevent or treat seizure in patients with severe traumatic brain injury. This study aimed to develop and validate methodology suitable for measuring levetiracetam concentrations in human plasma and urine. Methods: Plasma or urine (10 μl) samples were spiked with [2H6]-levetiracetam and processed using an acetonitrile precipitation. ESI-LC-MS/MS was employed for analyte detection. Results: The levetiracetam calibration was linear from 0.1 to 50 mg/l in a combined matrix of plasma and urine. Intra- and inter-assay imprecision and accuracy in plasma were <7.7 and 109%, and in urine were <7.9 and 108%, respectively. Conclusion: The validated method was applied to a pharmacokinetic study of levetiracetam in critically ill patients with severe traumatic brain injury.
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Heres A, Gallego M, Mora L, Toldrá F. Identification and Quantitation of Bioactive and Taste-Related Dipeptides in Low-Salt Dry-Cured Ham. Int J Mol Sci 2022; 23:2507. [PMID: 35269650 DOI: 10.3390/ijms23052507] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 02/22/2022] [Indexed: 01/27/2023] Open
Abstract
The reduction of salt in meat products influences the natural mechanisms of proteolysis occurring in their processing, and could affect the final characteristics of the product in terms of texture and flavor due to its effect on the activity of enzymes. In the present study, the quantitation of dipeptides PA, GA, VG, EE, ES, DA, and DG in low-salt Spanish dry-cured ham was carried out using a triple quadrupole mass spectrometry instrument. The developed methodology demonstrated the advantages of hydrophilic interaction liquid chromatography in the removal of salt as a clean-up/separation step before ionization. This resulted in a value of 44.88 μg/g dry-cured ham for GA dipeptide, and values ranging from 2 to 8 μg/g dry-cured ham for VG, EE, ES, DA, and DG dipeptides. PA showed the lowest concentration with a value of 0.18 μg/g dry-cured ham. These outcomes prove the remarkable activity of muscular dipeptidyl peptidases during dry-curing as well as confirming the presence of these dipeptides which are related to certain taste attributes (e.g., ‘bitter’ or ‘umami’). Such dipeptides have also been confirmed as anti-inflammatory and potential cardiovascular protectors using in vitro assays, with the advantage of dipeptides small size increases their chance to resist both gastrointestinal digestion and intestinal/bloodstream transport without being degraded or modified.
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Abstract
Multi-attribute methods (MAM), based on proteolytic digestion followed by liquid chromatography-mass spectrometry analysis of proteolytic peptides, have gained substantial attention in the biopharmaceutical industry for quantifying a variety of quality attributes for therapeutic proteins. Most MAM developed so far have been based on high-resolution mass spectrometers, due to their superb resolving power to distinguish analyte signals from interferences. Lower-resolution instruments, if demonstrated suitable, may further promote the adoption of the technology due to their low cost, small footprint, and ease of use. In this work, we compared the performance of a high-resolution instrument with a few low-resolution quadrupole-type instruments in quantifying a diverse set of quality attributes in a monoclonal antibody product. Different modes of operation for the quadrupole instruments, including scan mode, selected-ion monitoring and multiple-reaction monitoring, were evaluated. The high-resolution instrument has superb performance, with a quantitation limit of 0.002%. Single-quadrupole instruments in scan mode, on the other hand, provide a quantitation limit of about 1%, which may be fit-for-purpose for many routine MAM applications.
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Affiliation(s)
- Zhongqi Zhang
- Process Development, Amgen, Inc ., Thousand Oaks, CA, USA
| | - Pik K Chan
- Process Development, Amgen, Inc ., Thousand Oaks, CA, USA
| | | | - Bhavana Shah
- Process Development, Amgen, Inc ., Thousand Oaks, CA, USA
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Caba IC, Ştefănescu R, Tamba BI. Observation of Intact and Proteolytically Cleaved Amyloid-Beta (1-40)-Oleuropein Noncovalent Complex at Neutral pH by Mass Spectrometry. Molecules 2021; 26:3261. [PMID: 34071573 DOI: 10.3390/molecules26113261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 05/24/2021] [Accepted: 05/25/2021] [Indexed: 11/16/2022] Open
Abstract
Mass spectrometry analyses carried out on mass spectrometers equipped with soft ionization sources demonstrated their utility in the assessment of the formation of noncovalent complexes and the localization of the binding sites. Direct analyses by mass spectrometry of the noncovalent complex formed in acidic and mildly acidic environments by amyloid beta (1–40) peptide and oleuropein have been previously described, and, in several studies, the absorption, metabolism, excretion, and the implications in the prevention and therapy of Alzheimer’s disease of oleuropein have been investigated. Our paper presents modifications of the method previously employed for noncovalent complex observation, namely, the amyloid beta (1–40) pretreatment, followed by an increase in the pH and replacement of the chemical environment from ammonium acetate to ammonium bicarbonate. The formation of noncovalent complexes with one or two molecules of oleuropein was detected in all chemical solutions used, and the amyloid beta (17–28) binding site was identified via proteolytic experiments using trypsin prior to and after noncovalent complex formation. Our results highlight the importance of further studies on the effect of oleuropein against amyloid beta aggregation.
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Rodrigues AM, Langer S, Carrasquinho I, Bergström E, Larson T, Thomas-Oates J, António C. Pinus pinaster Early Hormonal Defence Responses to Pinewood Nematode ( Bursaphelenchus xylophilus) Infection. Metabolites 2021; 11:227. [PMID: 33917772 DOI: 10.3390/metabo11040227] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 03/30/2021] [Accepted: 04/06/2021] [Indexed: 12/31/2022] Open
Abstract
The pinewood nematode (PWN) is the causal agent of pine wilt disease, a pathology that affects conifer forests, mainly Pinus spp. PWN infection can induce the expression of phytohormone-related genes; however, changes at the early phytohormone level have not yet been explored. Phytohormones are low-abundance metabolites, and thus, difficult to quantify. Moreover, most methodologies focus mainly on Arabidopsis or crop species. This work aimed to validate a fast (run time 6.6 min) liquid chromatography-triple quadrupole tandem mass spectrometry (LC-QqQ-MS/MS) analytical method to quantify 14 phytohormones in Pinus pinaster stem tissues. This method was further applied to evaluate, for the first time, early phytohormone changes in susceptible and resistant phenotypes of P. pinaster 24, 48 and 72 h after inoculation (HAI) with PWN. A significant increase in salicylic acid (SA, 48 and 72 HAI) and jasmonic acid methyl ester (JA-ME, 72 HAI) was observed in susceptible phenotypes. Results indicate that the higher susceptibility of P. pinaster to PWN infection might result from an inefficient trigger of hypersensitive responses, with the involvement of JA and SA pathways. This work provides an important update in forest research, and adds to the current knowledge of Pinus spp. defence responses to PWN infection.
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Gabaston J, Valls Fonayet J, Franc C, Waffo-Teguo P, de Revel G, Hilbert G, Gomès E, Richard T, Mérillon JM. Characterization of Stilbene Composition in Grape Berries from Wild Vitis Species in Year-To-Year Harvest. J Agric Food Chem 2020; 68:13408-13417. [PMID: 33151680 DOI: 10.1021/acs.jafc.0c04907] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Asian and American Vitis species possess a strong potential for crossbreeding programs, owing to their several resistance properties. Stilbenes are phenolic compounds present in grape berries and are well-known for their main role as phytoalexins and resistance to biotic stresses in plants. However, their identification and quantification in grape berries from wild Vitis remains unexplored. A mass spectrometry multiple reaction monitoring method combined with the analysis of pure standards allowed for the unambiguous characterization of 20 stilbenes in the grape berry skin extracts of nine native Vitis species and one cultivated Vitis vinifera species (cv. Cabernet Sauvignon). A main occurrence of monomeric (Z-piceid, E-piceid, E-isorhapontin, and E-astringin), dimeric (E-ε-viniferin, Z-ε-viniferin, and pallidol), and oligomeric (isohopeaphenol and r-viniferin) stilbenes was highlighted. Some stilbenes were clearly characterized for the first time in grape berries, such as the dimers ampelopsin A, E-vitisinol C, and parthenocissin A as well as the tetramers r2-viniferin and r-viniferin. Stilbene composition and content varied widely among several Vitis species and vintage years.
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Affiliation(s)
- Julien Gabaston
- Université de Bordeaux, Unité de recherche Œnologie, EA 4577, USC 1366 INRAE, ISVV, F-33882 Villenave d'Ornon, France
| | - Josep Valls Fonayet
- Université de Bordeaux, Unité de recherche Œnologie, EA 4577, USC 1366 INRAE, ISVV, F-33882 Villenave d'Ornon, France
| | - Céline Franc
- Université de Bordeaux, Unité de recherche Œnologie, EA 4577, USC 1366 INRAE, ISVV, F-33882 Villenave d'Ornon, France
| | - Pierre Waffo-Teguo
- Université de Bordeaux, Unité de recherche Œnologie, EA 4577, USC 1366 INRAE, ISVV, F-33882 Villenave d'Ornon, France
| | - Gilles de Revel
- Université de Bordeaux, Unité de recherche Œnologie, EA 4577, USC 1366 INRAE, ISVV, F-33882 Villenave d'Ornon, France
| | - Ghislaine Hilbert
- EGFV, Université de Bordeaux, INRAE, Bordeaux Science Agro, F-33140 Villenave d'Ornon, France
| | - Eric Gomès
- EGFV, Université de Bordeaux, INRAE, Bordeaux Science Agro, F-33140 Villenave d'Ornon, France
| | - Tristan Richard
- Université de Bordeaux, Unité de recherche Œnologie, EA 4577, USC 1366 INRAE, ISVV, F-33882 Villenave d'Ornon, France
| | - Jean-Michel Mérillon
- Université de Bordeaux, Unité de recherche Œnologie, EA 4577, USC 1366 INRAE, ISVV, F-33882 Villenave d'Ornon, France
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Rubino FM. Center-of-Mass iso-Energetic Collision-Induced Decomposition in Tandem Triple Quadrupole Mass Spectrometry. Molecules 2020; 25:molecules25092250. [PMID: 32397650 PMCID: PMC7249026 DOI: 10.3390/molecules25092250] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/07/2020] [Accepted: 05/08/2020] [Indexed: 11/16/2022] Open
Abstract
Two scan modes of the triple quadrupole tandem mass spectrometer, namely Collision Induced Dissociation Precursor Ion scan and Neutral Loss scan, allow selectively pinpointing, in a complex mixture, compounds that feature specific chemical groups, which yield characteristic fragment ions or are lost as distinctive neutral fragments. This feature of the triple quadrupole tandem mass spectrometer allows the non-target screening of mixtures for classes of components. The effective (center-of-mass) energy to achieve specific fragmentation depends on the inter-quadrupole voltage (laboratory-frame collision energy) and on the masses of the precursor molecular ion and of the collision gas, through a non-linear relationship. Thus, in a class of homologous compounds, precursor ions activated at the same laboratory-frame collision energy face different center-of-mass collision energy, and therefore the same fragmentation channel operates with different degrees of efficiency. This article reports a linear equation to calculate the laboratory-frame collision energy necessary to operate Collision-Induced Dissociation at the same center-of-mass energy on closely related compounds with different molecular mass. A routine triple quadrupole tandem mass spectrometer can operate this novel feature (iso-energetic collision-induced dissociation scan; i-CID) to analyze mixtures of endogenous metabolites by Precursor Ion and Neutral Loss scans. The latter experiment also entails the hitherto unprecedented synchronized scanning of all three quadrupoles of the triple quadrupole tandem mass spectrometer. To exemplify the application of this technique, this article shows two proof-of-principle approaches to the determination of biological mixtures, one by Precursor Ion analysis on alpha amino acid derivatized with a popular chromophore, and the other on modified nucleosides with a Neutral Fragment Loss scan.
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Affiliation(s)
- Federico Maria Rubino
- LaTMA Laboratory for Analytical Toxicology and Metabonomics, Department of Health Sciences, Università degli Studi di Milano at "Ospedale San Paolo" v. A. di Rudinì 8, I-20142 Milano, Italy
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Phipps WS, Crossley E, Boriack R, Jones PM, Patel K. Quantitative amino acid analysis by liquid chromatography-tandem mass spectrometry using low cost derivatization and an automated liquid handler. JIMD Rep 2019; 51:62-69. [PMID: 32071840 PMCID: PMC7012744 DOI: 10.1002/jmd2.12080] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 09/11/2019] [Accepted: 09/13/2019] [Indexed: 01/22/2023] Open
Abstract
Amino acid analysis is central to newborn screening and the investigation of inborn errors of metabolism. Ion‐exchange chromatography with ninhydrin derivatization remains the reference method for quantitative amino acid analysis but offers slow chromatography and is susceptible to interference from other co‐eluting compounds. Liquid‐chromatography tandem mass spectrometry (LC‐MS/MS) provides a rapid and highly specific alternative, but sample preparation is frequently laborious and sometimes cost prohibitive. To address these limitations, we validated an LC‐MS/MS method using the aTRAQ Reagents Application Kit with a modified protocol consuming only half reagents. Adequate performance for clinical specimen measurement of 26 amino acids with high clinical relevance was achieved. An automated liquid handler and modified calibration and normalization approaches were used to ensure reproducible assay performance. Linear measurement between 5 and 2000 μM was achieved for most analytes despite use of a small, 10 μl sample size. Overall the method achieved near substantially improved throughput and enabled use of smaller samples volumes for batched analyses of clinical samples.
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Affiliation(s)
- William S Phipps
- Department of Pathology University of Texas at Southwestern Medical Center Dallas Texas
| | - Eric Crossley
- Chemistry, Metabolic Disease and Mass Spectrometry Laboratories Children's Health Dallas Texas
| | - Richard Boriack
- Chemistry, Metabolic Disease and Mass Spectrometry Laboratories Children's Health Dallas Texas
| | - Patricia M Jones
- Department of Pathology University of Texas at Southwestern Medical Center Dallas Texas.,Chemistry, Metabolic Disease and Mass Spectrometry Laboratories Children's Health Dallas Texas
| | - Khushbu Patel
- Department of Pathology University of Texas at Southwestern Medical Center Dallas Texas.,Chemistry, Metabolic Disease and Mass Spectrometry Laboratories Children's Health Dallas Texas
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Minet V, Evrard J, Vancraeynest C, Dogné JM, Mullier F, Pochet L. Development and validation of a liquid chromatography/tandem mass spectrometry method for the simultaneous quantification of serotonin and thromboxane B2 from activated platelets. Int J Lab Hematol 2018; 40:663-671. [PMID: 30019376 DOI: 10.1111/ijlh.12901] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 06/11/2018] [Accepted: 06/18/2018] [Indexed: 11/27/2022]
Abstract
INTRODUCTION Availability of a rapid and reliable platelet activation assay avoiding limitations of current techniques would be valuable to diagnose heparin-induced thrombocytopenia and platelet secretion disorders. OBJECTIVES The first aim was to develop and validate an ultra-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) method to quantify in a single run TxB2 synthesized and serotonin released from platelets. The second aim was to use our method in association with light transmission aggregometry (LTA) to select good platelet responders for the diagnosis of HIT. METHODS Electrospray ionization and chromatographic separation were optimized for the simultaneous dosage of serotonin and TxB2. The method was validated according to the European Medicines Agency (EMA) guideline for bioanalytical method validation. LTA was performed with monoclonal anti-CD9 (clone ALB6) as platelet activator to select good responders. RESULTS Detection was performed using a tandem mass spectrometer with alternated positive and negative electrospray ionization. The total run time was 6 minutes. The method was validated for calibration curves, precision, accuracy, lower limit of quantification, carry-over, selectivity, and matrix effect. Platelet response to ALB6 was highly variable among donors. CONCLUSION We developed and validated a UHPLC-MS/MS method for the simultaneous quantification of TxB2 and serotonin.
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Affiliation(s)
- Valentine Minet
- Department of Pharmacy, Namur Thrombosis and Hemostasis Center (NTHC), Namur Research Institute for LIfe Sciences (NARILIS), University of Namur, Namur, Belgium
| | - Jonathan Evrard
- Department of Pharmacy, Namur Thrombosis and Hemostasis Center (NTHC), Namur Research Institute for LIfe Sciences (NARILIS), University of Namur, Namur, Belgium
| | - Christelle Vancraeynest
- Department of Pharmacy, Namur Thrombosis and Hemostasis Center (NTHC), Namur Research Institute for LIfe Sciences (NARILIS), University of Namur, Namur, Belgium
| | - Jean-Michel Dogné
- Department of Pharmacy, Namur Thrombosis and Hemostasis Center (NTHC), Namur Research Institute for LIfe Sciences (NARILIS), University of Namur, Namur, Belgium
| | - François Mullier
- Université catholique de Louvain, CHU UCL Namur, Namur Thrombosis and Hemostasis Center (NTHC), NARILIS, Hemostasis Laboratory, Yvoir, Belgium
| | - Lionel Pochet
- Department of Pharmacy, Namur Thrombosis and Hemostasis Center (NTHC), Namur Research Institute for LIfe Sciences (NARILIS), University of Namur, Namur, Belgium
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Hughes LJ, Black LJ, Sherriff JL, Dunlop E, Strobel N, Lucas RM, Bornman JF. Vitamin D Content of Australian Native Food Plants and Australian-Grown Edible Seaweed. Nutrients 2018; 10:nu10070876. [PMID: 29986447 PMCID: PMC6073725 DOI: 10.3390/nu10070876] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 06/25/2018] [Accepted: 07/03/2018] [Indexed: 01/07/2023] Open
Abstract
Vitamin D has previously been quantified in some plants and algae, particularly in leaves of the Solanaceae family. We measured the vitamin D content of Australian native food plants and Australian-grown edible seaweed. Using liquid chromatography with triple quadrupole mass spectrometry, 13 samples (including leaf, fruit, and seed) were analyzed in duplicate for vitamin D2, vitamin D3, 25-hydroxyvitamin D2, and 25-hydroxyvitamin D3. Five samples contained vitamin D2: raw wattleseed (Acacia victoriae) (0.03 µg/100 g dry weight (DW)); fresh and dried lemon myrtle (Backhousia citriodora) leaves (0.03 and 0.24 µg/100 g DW, respectively); and dried leaves and berries of Tasmanian mountain pepper (Tasmannia lanceolata) (0.67 and 0.05 µg/100 g DW, respectively). Fresh kombu (Lessonia corrugata) contained vitamin D3 (0.01 µg/100 g DW). Detected amounts were low; however, it is possible that exposure to ultraviolet radiation may increase the vitamin D content of plants and algae if vitamin D precursors are present.
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Affiliation(s)
- Laura J Hughes
- School of Public Health, Curtin University, Bentley WA 6102, Australia.
| | - Lucinda J Black
- School of Public Health, Curtin University, Bentley WA 6102, Australia.
| | - Jill L Sherriff
- School of Public Health, Curtin University, Bentley WA 6102, Australia.
| | - Eleanor Dunlop
- School of Public Health, Curtin University, Bentley WA 6102, Australia.
| | - Norbert Strobel
- National Measurement Institute, 1/153 Bertie Street, Port Melbourne VIC 3207, Australia.
| | - Robyn M Lucas
- National Centre for Epidemiology and Population Health, Research School of Population Health, The Australian National University, Canberra ACT 2600, Australia.
- Centre for Ophthalmology and Visual Science, University of Western Australia, Perth WA 6009, Australia.
| | - Janet F Bornman
- School of Veterinary and Life Sciences, Murdoch University, Murdoch WA 6150, Australia.
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Kalu Appulage D, Wang EH, Figard BJ, Schug KA. An integrated multipath liquid chromatography-mass spectrometry system for the simultaneous preparation, separation, and detection of proteins and small molecules. J Sep Sci 2018; 41:2702-2709. [PMID: 29676850 DOI: 10.1002/jssc.201800298] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 04/10/2018] [Accepted: 04/11/2018] [Indexed: 11/08/2022]
Abstract
A multipath liquid chromatography with mass spectrometry instrument was constructed with the help of restricted access media to online segregate small and large molecules. This liquid chromatography system was custom built with five pumps and three two-position six-port valves to control the flow in a multipath system for the simultaneous analysis of small molecules and proteins. On separate chromatographic channels, small molecules trapped and proteins excluded from the online restricted access media were analyzed downstream using high-efficiency columns and a triple quadrupole mass spectrometer. A model sample, which included five proteins and 22 small molecules with different physicochemical properties, was used to evaluate the system. Following injection, the complete multipath separation and detection was performed in 22 min. Protein exclusion by the restricted access media was not quantitative. Four commercial trap columns were evaluated for their exclusion efficiency toward the proteins. Exclusion efficiency varied from <50% to only a maximum of 75% exclusion across the trap columns tested. An attempt was made to optimize the exclusion efficiency using different flow rates, flow rate gradients, and different additives both in the sample and the mobile phases. Protein exclusion was still erratic and generally nonquantitative.
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Affiliation(s)
- Dananjaya Kalu Appulage
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX, USA
| | - Evelyn H Wang
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX, USA
| | | | - Kevin A Schug
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX, USA
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Klockmann S, Reiner E, Cain N, Fischer M. Food Targeting: Geographical Origin Determination of Hazelnuts (Corylus avellana) by LC-QqQ-MS/MS-Based Targeted Metabolomics Application. J Agric Food Chem 2017; 65:1456-1465. [PMID: 28068089 DOI: 10.1021/acs.jafc.6b05007] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A targeted metabolomics LC-ESI-QqQ-MS application for geographical origin discrimination based on 20 nonpolar key metabolites was developed, validated according to accepted guidelines and used for quantitation via stable isotope labeled internal standards in 202 raw authentic hazelnut samples from six countries (Turkey, Italy, Georgia, Spain, France, and Germany) of harvest years 2014 and 2015. Multivariate statistics were used for detection of significant variations in metabolite levels between countries and, moreover, a prediction model using support vector machine classification (SVM) was calculated yielding 100% training accuracy and 97% cross-validation accuracy, which was subsequently applied to 55 hazelnut samples for the confectionary industry gaining up to 80% correct classifications compared to declared origin. The present method demonstrates the great suitability for targeted metabolomics applications in the geographical origin determination of hazelnuts and their applicability in routine analytics.
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Affiliation(s)
- Sven Klockmann
- Hamburg School of Food Science, Institute of Food Chemistry, University of Hamburg , Grindelallee 117, 20146 Hamburg, Germany
| | - Eva Reiner
- Hamburg School of Food Science, Institute of Food Chemistry, University of Hamburg , Grindelallee 117, 20146 Hamburg, Germany
| | - Nicolas Cain
- Hamburg School of Food Science, Institute of Food Chemistry, University of Hamburg , Grindelallee 117, 20146 Hamburg, Germany
| | - Markus Fischer
- Hamburg School of Food Science, Institute of Food Chemistry, University of Hamburg , Grindelallee 117, 20146 Hamburg, Germany
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Somoano-Blanco L, Borda M, González Gago A, Rodríguez-González P, Garcia Alonso JI. Evaluation of the spectral accuracy of mass spectrometers using compounds containing Cl or Br atoms. J Mass Spectrom 2016; 51:1036-1042. [PMID: 27477240 DOI: 10.1002/jms.3829] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Revised: 07/13/2016] [Accepted: 07/27/2016] [Indexed: 06/06/2023]
Abstract
Current procedures for the evaluation of spectral accuracy of mass spectrometers are limited by the lack of certified isotopic reference materials and the high uncertainty in the isotopic composition of natural abundance molecules. The calculated uncertainties in the ratio M + 1/M for natural abundance molecules containing any number of C, H, N and/or O atoms are close to 5% relative because of the natural variability of the isotopic composition of carbon. So, we have developed two alternative measurement procedures with much lower theoretical uncertainties for a better evaluation of spectral accuracy in both single and triple quadrupole analysers. The first method is based on the measurement of the M + 2/M, M + 4/M + 2, etc. ratios for halogenated organic compounds containing either Cl or Br. The theoretical uncertainties for these ratios because of natural variability are in the order of 0.3 to 1.0% making them suitable for the evaluation of spectral accuracy with the additional advantage that there is no need to take into account other limitations such as cluster purity or poor mass resolution. This procedure was applied to the evaluation of a single quadrupole GC-MS instruments using natural abundance PCB and PBDE standards with satisfactory results. The second method can be applied to tandem instruments and takes advantage of the loss of two halogen atoms when PCB and PBDE standards are fragmented by Collision Induced Dissociation. Theoretical SRM transition ratios can be calculated as a pure combinatorial probability with theoretical uncertainties lower than 0.1%. By combining PCBs and PBDEs with different number of halogen atoms, a mass range from 100 to 700 u and abundance ratios from 0.1 to 10 can be evaluated. The use of penta-chlorinated PCBs and/or penta-brominated PBDEs is finally recommended for the evaluation of spectral accuracy of mass spectrometers with the EI source. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Lourdes Somoano-Blanco
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, Oviedo, Spain
| | - Melanie Borda
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, Oviedo, Spain
| | - Adriana González Gago
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, Oviedo, Spain
| | - Pablo Rodríguez-González
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, Oviedo, Spain
| | - J Ignacio Garcia Alonso
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, Oviedo, Spain.
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Bros P, Vialaret J, Barthelemy N, Delatour V, Gabelle A, Lehmann S, Hirtz C. Antibody-free quantification of seven tau peptides in human CSF using targeted mass spectrometry. Front Neurosci 2015; 9:302. [PMID: 26388715 PMCID: PMC4555028 DOI: 10.3389/fnins.2015.00302] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 08/10/2015] [Indexed: 11/25/2022] Open
Abstract
Tau protein concentration in cerebrospinal fluid (CSF) is currently used as a sensitive and specific biomarker for Alzheimer's disease. Its detection currently relies on ELISA but the perspective of using mass spectrometry (MS) to detect its different proteoforms represents an interesting alternative. This is however an analytical challenge because of its low concentration in the CSF, a biological fluid collected in small volume by lumbar puncture, and with a high structural heterogeneity. To overcome these issues, instead of using immunocapture as previously done, we rather relied on an original two steps pre-fractionation technique of CSF: perchloric acid (PCA) followed by micro solid phase extraction (μSPE). We could then measure seven tau trypsic peptides by Multiple Reaction Monitoring (MRM) on a triple quadrupole mass spectrometer. Quantification was performed using isotopically labeled 15N- recombinant tau protein as internal standard and validated using CSF pools with low, medium, or high tau concentrations (HTCs). Repeatability, intermediate precision, linearity, limit of quantification (LOQ), and recovery were calculated for the different peptides. This new MRM assay, which allowed for the first time CSF tau protein quantification without immunocapture, has important potential application to follow tau metabolism in both diagnostic and therapeutic research.
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Affiliation(s)
- Pauline Bros
- Laboratoire de Biochimie et de Protéomique Clinique - Institut de Médecine Régénérative et Biothérapies, Centre Hospitalier Universitaire de Montpellier Montpellier, France ; Laboratoire National de Métrologie et d'Essais (LNE) Paris, France
| | - Jérôme Vialaret
- Laboratoire de Biochimie et de Protéomique Clinique - Institut de Médecine Régénérative et Biothérapies, Centre Hospitalier Universitaire de Montpellier Montpellier, France
| | - Nicolas Barthelemy
- Laboratoire de Biochimie et de Protéomique Clinique - Institut de Médecine Régénérative et Biothérapies, Centre Hospitalier Universitaire de Montpellier Montpellier, France
| | - Vincent Delatour
- Laboratoire National de Métrologie et d'Essais (LNE) Paris, France
| | - Audrey Gabelle
- Laboratoire de Biochimie et de Protéomique Clinique - Institut de Médecine Régénérative et Biothérapies, Centre Hospitalier Universitaire de Montpellier Montpellier, France ; Centre Mémoire Ressources Recherche, Centre Hospitalier Universitaire de Montpellier, Hôpital Gui de Chauliac, Université Montpellier I Montpellier, France
| | - Sylvain Lehmann
- Laboratoire de Biochimie et de Protéomique Clinique - Institut de Médecine Régénérative et Biothérapies, Centre Hospitalier Universitaire de Montpellier Montpellier, France
| | - Christophe Hirtz
- Laboratoire de Biochimie et de Protéomique Clinique - Institut de Médecine Régénérative et Biothérapies, Centre Hospitalier Universitaire de Montpellier Montpellier, France
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Ahrends R, Niewiadomski P, Teruel MN, Rohatgi R. Measuring Gli2 Phosphorylation by Selected Reaction Monitoring Mass Spectrometry. Methods Mol Biol 2015; 1322:105-23. [PMID: 26179043 PMCID: PMC4699800 DOI: 10.1007/978-1-4939-2772-2_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Phosphorylation is an important mechanism by which Gli proteins are regulated. When the Hedgehog (Hh) pathway is activated, multiple serine and threonine residues of Gli2 are dephosphorylated, while at least one residue undergoes phosphorylation. These changes in phosphorylation have functional relevance for the transcriptional activity of Gli proteins, as shown by in vitro and in vivo assays on Gli mutants lacking the phosphorylated residues. Here, we describe a method of quantitatively monitoring the phosphorylation of Gli proteins by triple quadrupole mass spectrometry of Gli2 immunoprecipitated from cell lysates. This method is broadly applicable to the monitoring of phosphorylation changes of immunoprecipitated Gli proteins when the putative phosphosites are known.
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Affiliation(s)
- Robert Ahrends
- Project group Quantitative Systems Analysis, Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., 44227, Dortmund, Germany
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Sirocchi V, Caprioli G, Ricciutelli M, Vittori S, Sagratini G. Simultaneous determination of ten underivatized biogenic amines in meat by liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). J Mass Spectrom 2014; 49:819-25. [PMID: 25230178 DOI: 10.1002/jms.3418] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Revised: 04/17/2014] [Accepted: 06/19/2014] [Indexed: 05/24/2023]
Abstract
Biogenic amines (BAs) are considered to be important indicators of freshness and quality in food. In this work, an analytical method for analyzing ten underivatized BAs in meat by performance liquid chromatography-tandem mass spectrometry has been developed. Comparison between ion trap and triple quadrupole as mass analyzers indicated that the latter provides greater sensitivity and selectivity. The range of the correlation coefficients of the calibration curves of the analyzed compounds was 0.987-0.999, and the limits of detection and limits of quantification were in the range of 0.002-0.1 mg l(-1) and 0.008-0.5 mg l(-1), respectively. Once validated, the method was used to analyze the concentrations of BAs in 16 commercial meat samples, for evaluating the freshness of food through the study of BA indices, i.e. biogenic amine index (BAI) and the ratio spermidine/spermine (SPD/SPE). The results indicated that all the samples were fresh, with a BAI lower than 1.49 mg kg(-1) and a SPD/SPE ratio lower than 0.41 in each case. This methodology for testing the freshness of meat has potential for quality control applications along the entire production chain of meat products.
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Affiliation(s)
- Veronica Sirocchi
- School of Pharmacy, University of Camerino, via S. Agostino 1, 62032, Camerino, Italy
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Cox DM, Zhong F, Du M, Duchoslav E, Sakuma T, McDermott JC. Multiple reaction monitoring as a method for identifying protein posttranslational modifications. J Biomol Tech 2005; 16:83-90. [PMID: 16030315 PMCID: PMC2291721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The activity of many transcriptional regulators is significantly altered by posttranslational modifications of specific sites. For example, the activity of the muscle-restricted transcription factor family myocyte enhancer factor 2 (MEF2) is tightly controlled by phosphorylation. This modification is responsible for either an increase or a decrease in transcriptional activity, depending on the specific amino acid residues that are phosphorylated by signal-dependent kinases. Although mass spectrometry-based methods, such as precursor ion and neutral loss scans, are extremely useful for identifying unknown phosphopeptides from a complex mixture, they do not take advantage of any prior knowledge about the protein being investigated. Quite often a significant amount of information is available. This may include the primary sequence, type of phosphorylation (serine/threonine vs. tyrosine), or predicted phosphoacceptor sites (consensus peptide that is targeted by a kinase). This information can be used to predict precursor and fragment ion m/z values for a multiple reaction monitoring (MRM) experiment. By using these highly sensitive MRM experiments to trigger dependent product ion scans on a hybrid quadrupole linear ion-trap instrument, we were able to identify low levels of phosphorylation of MEF2A (a member of the MEF2 family), and alpha-casein. This method of monitoring protein phosphorylation at specific phosphoacceptor sites may prove useful in understanding the physiological regulation of protein function.
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Affiliation(s)
- David M Cox
- Product Application Laboratory, MDS Sciex, 71 Four Valley Drive, Concord, Ontario, Canada L4K 4V8.
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