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Ivanova D, Nedialkov P, Tashev A, Kokanova-Nedialkova Z, Olech M, Nowak R, Boyadzhieva S, Angelov G, Yankov D. Anticancer Podophyllotoxin Recovery from Juniper Leaves at Atmospheric and High Pressure Using Eco-Friendly Solvents. PLANTS (BASEL, SWITZERLAND) 2023; 12:1526. [PMID: 37050153 PMCID: PMC10096874 DOI: 10.3390/plants12071526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 03/24/2023] [Accepted: 03/28/2023] [Indexed: 06/19/2023]
Abstract
Podophyllotoxin (PPT) is a precursor for the synthesis of drugs against cancer and other diseases. The present sources of PPT (Sinopodophyllum hexandrum and Podophyllum peltatum) are endangered species, with PPT production highly dependent on their growing conditions. In connection with the identification of new sources of PPT, the present study aimed to recover PPT from Juniperus virginiana leaves via atmospheric or high pressure extraction methods with a focus on using eco-friendly solvents. PPT quantification was determined by UHPLC/HRMS/MS. A thorough study of conventional extraction was carried out to reveal the optimal conditions (solvent ethyl acetate at room temperature and a duration of 1 h) for maximizing the PPT recovery (about 30 mg/g of dry extract and 3 mg/g of dry initial plant material). Peleg's equation was applied for process kinetics modeling. The best PPT content in the final dry extract (42-45 mg/g of dry extract) was obtained by high pressure methods under supercritical (scCO2 with ethanol or ethyl acetate, 30 MPa, 50 °C and 100 min) or accelerated solvent extraction conditions (solvent ethyl acetate, 10.35 MPa, 20 °C and 3 cycles for 15 min). Seasonal stability and storage stability of the raw material were also determined. The present results have potential applications in the pharmacy for the delivery of PPT from juniper leaves.
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Affiliation(s)
- Diana Ivanova
- Institute of Chemical Engineering, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Paraskev Nedialkov
- Department of Pharmacognosy, Faculty of Pharmacy, Medical University, 1000 Sofia, Bulgaria
| | - Alexander Tashev
- Department of Dendrology, University of Forestry, 1756 Sofia, Bulgaria
| | | | - Marta Olech
- Department of Pharmaceutical Botany, Faculty of Pharmacy, Medical University of Lublin, 20-059 Lublin, Poland
| | - Renata Nowak
- Department of Pharmaceutical Botany, Faculty of Pharmacy, Medical University of Lublin, 20-059 Lublin, Poland
| | | | - George Angelov
- Institute of Chemical Engineering, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Dragomir Yankov
- Institute of Chemical Engineering, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Bi C, Gao Y, Li C, Gao Y, Wang K, He Y, Li Z, Yuan H. Development, validation, and clinical application of a rapid UPLC-MS/MS method for detection of colchicine in human whole blood and urine. Biomed Chromatogr 2022; 36:e5437. [PMID: 35766796 DOI: 10.1002/bmc.5437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Revised: 06/22/2022] [Accepted: 06/26/2022] [Indexed: 11/07/2022]
Abstract
A rapid, simple, and economical method has been developed to determine colchicine in both human whole blood and urine using UPLC-MS/MS. Colchicine and isotope-labeled internal standard were extracted from the matrix by liquid-liquid extraction with saturated borax and ethyl acetate, and separated by a reversed-phase chromatography C18 column. Gradient elution was carried out using acetonitrile and water spiked with 0.01% formic acid. Multiple reaction monitoring was performed at positive ion mode. The quantitative transitions were m/z 400.27 → 310.28 for colchicine and m/z 406.16 → 313.18 for colchicine-D6. The method has good linearity in the range of 0.5-200 ng/mL for blood and 2-2000 ng/mL for urine. The sensitivity, accuracy, and matrix effect were all in line with the guidelines of Food and Drug Administration and European Medicines Agency. The extraction recovery was above 63.94%. The samples were stable under various storage conditions. Six deuterium-substituted isotopic internal standard was used to demonstrate a different mode of colchicine cleavage from the existing literature. This method has been successfully used in the diagnosis of patients with colchicine poisoning. Blood is recommended as the optimal sample compared with urine.
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Affiliation(s)
- Chongwen Bi
- Drug and Poison Testing Center, Tianjin Medical University General Hospital, Tianjin, China
| | - Ying Gao
- Department of Critical Care Medicine, Tianjin Medical University General Hospital, Tianjin, China
| | - Chunlin Li
- College of Pharmacy, Tianjin Medical University, Tianjin, China
| | - Yuyang Gao
- Department of Pharmacy, Tianjin People Hospital, Tianjin, China
| | - Kaiwen Wang
- College of Pharmacy, Tianjin Medical University, Tianjin, China
| | - Yifan He
- Drug and Poison Testing Center, Tianjin Medical University General Hospital, Tianjin, China
| | - Zhengxiang Li
- Drug and Poison Testing Center, Tianjin Medical University General Hospital, Tianjin, China
| | - Hengjie Yuan
- Drug and Poison Testing Center, Tianjin Medical University General Hospital, Tianjin, China
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Identification and Quantification of “Quality Markers” in Tongkang Tablet on Recurrent Respiratory Tract Infections (RRTIs) by UFLC-IT-TOF–MS/MS and HPLC–DAD. Chromatographia 2020. [DOI: 10.1007/s10337-020-03881-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Dong-Wei C, Yuan Z, Xiao-Yi D, Yu Z, Guo-Hui L, Xue-Song F. Progress in Pretreatment and Analytical Methods of Coumarins: An Update since 2012 - A Review. Crit Rev Anal Chem 2020; 51:503-526. [PMID: 32314593 DOI: 10.1080/10408347.2020.1750338] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Coumarins are widely used due to their wide range of biological activities, but the long-term or excessive use of coumarin flavors can pose serious health hazards. Therefore, sensitive and specific methods for the quantification of these compounds in different matrices have been developed. In this review, an updated overview of the latest trends in sample preparation techniques and methods used to detect coumarins from March 2012 to April 2019 is provided. This study reviews different analytical methods (such as liquid chromatography coupled with different detectors, electrochemical sensors, capillary electrophoresis, etc.) and different pretreatment methods (such as liquid-liquid extraction, solid-phase extraction, dispersive liquid-liquid microextraction, etc.). Different methods for the pretreatment and determination of coumarins in plant, food, environmental, pharmaceutical and biological samples are summarized, discussed and compared.HighlightsProgress in pretreatment and analytical methods of coumarins are summarized.Fundamentals, instrumentation and applications of purification and quantification are summarized and compared.Optimization of experimental conditions are discussed.Newly emerged eco-friendly methods are introduced.
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Affiliation(s)
- Cui Dong-Wei
- School of Pharmacy, China Medical University, Shenyang, China
| | - Zhang Yuan
- Department of Pharmacy, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Duan Xiao-Yi
- School of Pharmacy, China Medical University, Shenyang, China
| | - Zhou Yu
- Department of Pharmacy, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Li Guo-Hui
- Department of Pharmacy, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Feng Xue-Song
- School of Pharmacy, China Medical University, Shenyang, China
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Geng CA, Chen JJ. A Fragmentation Study on Four Unusual Secoiridoid Trimers, Swerilactones H-K, by Electrospray Tandem Mass Spectrometry. NATURAL PRODUCTS AND BIOPROSPECTING 2016; 6:297-303. [PMID: 27844233 PMCID: PMC5136375 DOI: 10.1007/s13659-016-0114-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 11/06/2016] [Indexed: 05/04/2023]
Abstract
Swerilactones H-K (1-4) as four unprecedented secoiridoid trimers represent a new type of natural product, which has attracted much interest of natural chemists due to their novel skeletons and promising bioactivity. In order to well understand their MS fragmentation behaviors, they were investigated by electrospray ionization ion-trap time-of-flight multistage product ion mass spectrometry (ESI-IT-TOF-MS n ) for the first time. The protonated molecules ([M+H]+) of swerilactones J and K, and deprotonated molecules ([M-H]-) of swerilactones H, J and K were readily observed in the conventional single-stage mass spectra (MS); however only the [M+Cl]- ion for swerilactone I was obtained in negative mode. Based on the MS n study, the fragmentation pathways of swerilactones H and I in negative mode, and swerilactones J and K in both positive and negative modes were proposed. The neutral losses of H2O, CO, CO2 and C2H4O moieties are the particular elimination from the precursor ions due to the presence of hydroxyl, δ-lactone and 1-O-ethyl moieties in their structures, of which the retro-Diels-Alder cleavage was the most particular dissociation. The fragment ions at m/z 341 and 291 in negative mode can be considered as the diagnostic ions for secoiridoid trimers. This investigation will provide valuable information for their fast characterization from complicated natural mixtures and extensive understanding their structural architectures.
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Affiliation(s)
- Chang-An Geng
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, No. 132 Lanhei Road, Kunming, 650201, China
- Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming, 650201, China
| | - Ji-Jun Chen
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, No. 132 Lanhei Road, Kunming, 650201, China.
- Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming, 650201, China.
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Liang Z, Zhang J, Zhang X, Li J, Zhang X, Zhao C. Endophytic Fungus from Sinopodophyllum emodi (Wall.) Ying that Produces Podophyllotoxin. J Chromatogr Sci 2015; 54:175-8. [PMID: 26306574 DOI: 10.1093/chromsci/bmv124] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Indexed: 11/14/2022]
Abstract
The aryltetralin lactone podophyllotoxin, which exhibits pronounced antineoplastic activity, is used as the precursor of the following three clinical anticancer drugs: Etoposide™, Etopophos™ and Teniposide™. The natural occurrence of this arylnaphthalene lignan is scarce and unable to meet the ever-rising demand in the medical industry. Thus, developing alternative sources for the production of podophyllotoxin is extremely urgent. This is the first report of the production of podophyllotoxin from endophytic Alternaria tenuissima isolated from Sinopodophyllum emodi (Wall.) Ying. The identification of podophyllotoxin was performed using high-performance liquid chromatography and liquid chromatography-mass spectrometry (MS)-MS and confirmed by comparison with authentic standards.
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Affiliation(s)
- Zizhen Liang
- Key Laboratory of Cell Proliferation and Regulation Biology, Ministry of Education, College of Life Science, Beijing Normal University, Beijing 100875, China
| | - Jia Zhang
- Key Laboratory of Cell Proliferation and Regulation Biology, Ministry of Education, College of Life Science, Beijing Normal University, Beijing 100875, China
| | - Xuan Zhang
- Key Laboratory of Cell Proliferation and Regulation Biology, Ministry of Education, College of Life Science, Beijing Normal University, Beijing 100875, China
| | - Jinjie Li
- Key Laboratory of Cell Proliferation and Regulation Biology, Ministry of Education, College of Life Science, Beijing Normal University, Beijing 100875, China
| | - Xiaoqian Zhang
- Key Laboratory of Cell Proliferation and Regulation Biology, Ministry of Education, College of Life Science, Beijing Normal University, Beijing 100875, China
| | - Changqi Zhao
- Key Laboratory of Cell Proliferation and Regulation Biology, Ministry of Education, College of Life Science, Beijing Normal University, Beijing 100875, China Beijing Area Major Laboratory of Protection and Utilization of Traditional Chinese Medicine, Beijing 100875, China
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Chen XL, Geng CA, Chen JJ. A fragmentation study on four C19-diterpenoid alkaloids by electrospray ionization ion-trap time-of-flight tandem mass spectrometry. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2015; 17:915-929. [PMID: 26274911 DOI: 10.1080/10286020.2015.1038524] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
High-resolution electrospray ionization ion-trap time-of-flight tandem mass spectrometry (HR-ESI-IT-TOF-MS(n)) in positive-ion mode was used to determine the accurate masses and fragmentation pathways of four C(19)-diterpenoid alkaloids, aconitine (1), yunnaconitine (2), crassicauline A (3), and benzoylmesaconine (4). The [M+H](+) ions of compounds 1-4 were readily observed in conventional single-stage mass spectrometry. Based on the MS(1-6) analyses, detailed fragmentation rules of the four compounds were proposed. The neutral losses of AcOH, MeOH, H(2)O, CO, C(2)H(4), PhCOOH and p-OMePhCOOH segments were the characteristic eliminations from the precursor ions due to the presence of acetyl, methoxyl, hydroxyl, N-ethyl, benzoyl and p-methoxyl-benzoyl units in the structures. Benefited from the high resolution of the mass analyzer, the loss of 28 Da corresponding to CO or CH(4) segment in product ions was unambiguously distinguished. The losing sequence of the main substituent groups was summarized as: C(8)-acetyl>C(16)-methotyl>C(15)-hydroxyl>C(6)-methoxyl>C(1)-methoxyl/C(3)-hydroxyl>C(18)-methoxyl>>C(13)-hydroxyl. The sequential loss of (16)-methoxyl moiety and CO (generating from enol-ketone tautomerism) groups could be recognized as the characteristic eliminations for the compounds with C(16)-methoxyl and C(15)-hydroxyl groups simultaneously. The application of HR-ESI-IT-TOF-MS(n) technique to investigate the fragmentation of C(19)-diterpenoid alkaloids provided useful information to understand their fragmentation behaviors.
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Affiliation(s)
- Xing-Long Chen
- a State Key Laboratory of Phytochemistry and Plant Resources in West China , Kunming Institute of Botany, Chinese Academy of Sciences , Kunming 650201 , China
- b University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Chang-An Geng
- a State Key Laboratory of Phytochemistry and Plant Resources in West China , Kunming Institute of Botany, Chinese Academy of Sciences , Kunming 650201 , China
| | - Ji-Jun Chen
- a State Key Laboratory of Phytochemistry and Plant Resources in West China , Kunming Institute of Botany, Chinese Academy of Sciences , Kunming 650201 , China
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HPLC–MS/MS method for the determination of four lignans from Phyllanthus urinaria L. in rat plasma and its application. Bioanalysis 2015; 7:701-12. [DOI: 10.4155/bio.14.312] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Background: Phyllanthus urinaria L. showed significant hepatoprotective and anti-HBV activities. A sensitive and rapid HPLC–MS/MS method has been developed and validated for the simultaneous determination of hypophyllanthin, phyllanthin, nirtetralin and niranthin from Phyllanthus urinaria L. in rat plasma. The analytes were extracted from rat plasma with n-hexane/isopropanol and diazepam was used as the internal standard. Results: The calibration curves were linear (r > 0.9971) over a concentration range of 2–1000 ng/ml for hypophyllanthin and nirtetralin, and 1–1000 ng/ml for phyllanthin and niranthin. The precision, accuracy, recovery and stability were deemed acceptable. Conclusion: The HPLC–MS/MS method was successfully applied to a PK study of the four lignans in rats after oral administration of Phyllanthus urinaria L. extract.
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Kang M, Yang Y, Zhang P, Dong J. Identification and Analysis of Impurities in Erythrosine by High-Performance Liquid Chromatography with Quadrupole Ion Trap Time-of-Flight Mass Spectrometry. FOOD ANAL METHOD 2012. [DOI: 10.1007/s12161-012-9512-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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10
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Raju B, Ramesh M, Borkar RM, Srinivas R, Padiya R, Banerjee SK. In vivo metabolic investigation of moxifloxacin using liquid chromatography/electrospray ionization tandem mass spectrometry in combination with online hydrogen/deuterium exchange experiments. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2012; 26:1817-1831. [PMID: 22777784 DOI: 10.1002/rcm.6288] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
RATIONALE Tuberculosis is a leading cause of death from an infectious disease and moxifloxacin is an effective drug as compared to other fluoroquinolones. To date only two metabolites of the drug are known. Therefore, the present study on characterization of hitherto unknown in vivo metabolites of moxifloxacin using liquid chromatography/electrospray ionization tandem mass spectrometry (LC/ESI-MS/MS) is undertaken. METHODS In vivo metabolites of moxifloxacin have been identified and characterized by using LC/ESI-MS/MS in combination with an online hydrogen/deuterium (H/D) exchange technique. To identify in vivo metabolites, blood, urine and faeces samples were collected after oral administration of moxifloxacin to Sprague-Dawley rats. The samples were prepared using an optimized sample preparation approach involving protein precipitation, liquid-liquid extraction followed by solid-phase extraction and LC/MS/MS analysis. RESULTS A total of nine phase I and ten phase II metabolites of moxifloxacin have been identified in urine samples including N-sulphated, glucuronide and hydroxylated metabolites which are also observed in plasma samples. In faeces samples, only the N-sulphated metabolite is observed. The structures of metabolites have been elucidated based on fragmentation patterns, accurate mass measurements and online H/D exchange LC/MS/MS experiments. Online H/D exchange experiments are used to support the identification and structural characterization of drug metabolites. CONCLUSIONS A total of 19 in vivo metabolites of moxifloxacin have been characterized using LC/ESI-MS/MS in combination with accurate mass measurements and online H/D exchange experiments. The main phase I metabolites of moxifloxacin are hydroxylated, decarbonylated, desmethylated and desmethylhydroxylated metabolites which undergo subsequent phase II glucuronidation pathways.
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Affiliation(s)
- B Raju
- National Centre for Mass Spectrometry, Indian Institute of Chemical Technology, Hyderabad, 500 007, India
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Geng CA, Ma YB, Zhang XM, Yao SY, Xue DQ, Zhang RP, Chen JJ. Mulberrofuran G and isomulberrofuran G from Morus alba L.: anti-hepatitis B virus activity and mass spectrometric fragmentation. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:8197-202. [PMID: 22835135 DOI: 10.1021/jf302639b] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Mulberrofuran G (1) and isomulberrofuran G (2), a pair of isomeric Diels-Alder-type adducts, were isolated from the root bark of Morus alba L. Isomulberrofuran G (2) as a new IIB-type Diels-Alder-type adduct, was elucidated by extensive (1)H, (13)C, and two-dimensional (2D) nuclear magnetic resonance (NMR) and mass spectrometry (MS) spectroscopic analyses. A fragmentation study on compounds 1 and 2 was performed by high-resolution electrospray ionization (ESI) multistage tandem mass spectrometry linked with ion-trap (IT) and time-of-flight (TOF) mass analyzers (ESI-MS(n)/IT-TOF) in negative mode, which resulted in obviously different fragmentations. In the MS(2) experiments, the characteristic ions at m/z 451 and 439 could be revealed as their respective diagnostic ions. Mulberrofuran G (1) showed moderate activity, inhibiting hepatitis B virus (HBV) DNA replication with the IC(50) value of 3.99 μM, according to the anti-HBV assay on the HepG 2.2.15 cell line in vitro.
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Affiliation(s)
- Chang-An Geng
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, People's Republic of China
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Analysis of 6-methoxy podophyllotoxin and podophyllotoxin in hairy root cultures of Linum album Kotschy ex Boiss. Med Chem Res 2012. [DOI: 10.1007/s00044-012-0067-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Chen XF, Wu HT, Tan GG, Zhu ZY, Chai YF. Liquid chromatography coupled with time-of-flight and ion trap mass spectrometry for qualitative analysis of herbal medicines. J Pharm Anal 2011; 1:235-245. [PMID: 29403704 PMCID: PMC5760787 DOI: 10.1016/j.jpha.2011.09.008] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Accepted: 09/07/2011] [Indexed: 12/14/2022] Open
Abstract
With the expansion of herbal medicine (HM) market, the issue on how to apply up-to-date analytical tools on qualitative analysis of HMs to assure their quality, safety and efficacy has been arousing great attention. Due to its inherent characteristics of accurate mass measurements and multiple stages analysis, the integrated strategy of liquid chromatography (LC) coupled with time-of-flight mass spectrometry (TOF-MS) and ion trap mass spectrometry (IT-MS) is well-suited to be performed as qualitative analysis tool in this field. The purpose of this review is to provide an overview on the potential of this integrated strategy, including the review of general features of LC-IT-MS and LC-TOF-MS, the advantages of their combination, the common procedures for structure elucidation, the potential of LC-hybrid-IT-TOF/MS and also the summary and discussion of the applications of the integrated strategy for HM qualitative analysis (2006-2011). The advantages and future developments of LC coupled with IT and TOF-MS are highlighted.
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Affiliation(s)
- Xiao-Fei Chen
- Department of Pharmaceutical Analysis, School of Pharmacy, Second Military Medical University, Shanghai 200433, China.,Shanghai Key Laboratory for Pharmaceutical Metabolite Research, Shanghai 200433, China
| | - Hai-Tang Wu
- Department of Pharmaceutical Analysis, School of Pharmacy, Second Military Medical University, Shanghai 200433, China.,Shanghai Key Laboratory for Pharmaceutical Metabolite Research, Shanghai 200433, China
| | - Guang-Guo Tan
- Department of Pharmaceutical Analysis, School of Pharmacy, Second Military Medical University, Shanghai 200433, China.,Shanghai Key Laboratory for Pharmaceutical Metabolite Research, Shanghai 200433, China
| | - Zhen-Yu Zhu
- Department of Pharmaceutical Analysis, School of Pharmacy, Second Military Medical University, Shanghai 200433, China.,Shanghai Key Laboratory for Pharmaceutical Metabolite Research, Shanghai 200433, China
| | - Yi-Feng Chai
- Department of Pharmaceutical Analysis, School of Pharmacy, Second Military Medical University, Shanghai 200433, China.,Shanghai Key Laboratory for Pharmaceutical Metabolite Research, Shanghai 200433, China
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Kind T, Fiehn O. Advances in structure elucidation of small molecules using mass spectrometry. BIOANALYTICAL REVIEWS 2010; 2:23-60. [PMID: 21289855 PMCID: PMC3015162 DOI: 10.1007/s12566-010-0015-9] [Citation(s) in RCA: 303] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2010] [Accepted: 08/03/2010] [Indexed: 12/22/2022]
Abstract
The structural elucidation of small molecules using mass spectrometry plays an important role in modern life sciences and bioanalytical approaches. This review covers different soft and hard ionization techniques and figures of merit for modern mass spectrometers, such as mass resolving power, mass accuracy, isotopic abundance accuracy, accurate mass multiple-stage MS(n) capability, as well as hybrid mass spectrometric and orthogonal chromatographic approaches. The latter part discusses mass spectral data handling strategies, which includes background and noise subtraction, adduct formation and detection, charge state determination, accurate mass measurements, elemental composition determinations, and complex data-dependent setups with ion maps and ion trees. The importance of mass spectral library search algorithms for tandem mass spectra and multiple-stage MS(n) mass spectra as well as mass spectral tree libraries that combine multiple-stage mass spectra are outlined. The successive chapter discusses mass spectral fragmentation pathways, biotransformation reactions and drug metabolism studies, the mass spectral simulation and generation of in silico mass spectra, expert systems for mass spectral interpretation, and the use of computational chemistry to explain gas-phase phenomena. A single chapter discusses data handling for hyphenated approaches including mass spectral deconvolution for clean mass spectra, cheminformatics approaches and structure retention relationships, and retention index predictions for gas and liquid chromatography. The last section reviews the current state of electronic data sharing of mass spectra and discusses the importance of software development for the advancement of structure elucidation of small molecules. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s12566-010-0015-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Tobias Kind
- Genome Center–Metabolomics, University of California Davis, Davis, CA 95616 USA
| | - Oliver Fiehn
- Genome Center–Metabolomics, University of California Davis, Davis, CA 95616 USA
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A diazirine-based photoaffinity etoposide probe for labeling topoisomerase II. Bioorg Med Chem 2009; 18:830-8. [PMID: 20006518 DOI: 10.1016/j.bmc.2009.11.048] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2009] [Revised: 11/13/2009] [Accepted: 11/21/2009] [Indexed: 11/23/2022]
Abstract
Etoposide is a widely used anticancer drug that targets topoisomerase II, an essential nuclear enzyme. However, despite the fact that it has been in use and studied for more than 30years the specific site on the enzyme to which it binds is unknown. In order to identify the etoposide binding site(s) on topoisomerase II, a diazirine-based photoaffinity etoposide analog probe has been synthesized and its photoreactivity and biological activities have been characterized. Upon UV irradiation, the diazirine probe rapidly produced a highly reactive carbene species that formed covalent adducts containing stable carbon-based bonds indicating that it should also be able to form stable covalent adducts with amino acid residues on topoisomerase II. The human leukemia K562 cell growth and topoisomerase II inhibitory properties of the diazirine probe suggest that it targets topoisomerase II in a manner similar to etoposide. The diazirine probe was also shown to act as a topoisomerase II poison through its ability to cause topoisomerase IIalpha-mediated double-strand cleavage of DNA. Additionally, the diazirine probe significantly increased protein-DNA covalent complex formation upon photoirradiation of diazirine probe-treated K562 cells, as compared to etoposide-treated cells. This result suggests that the photoactivated probe forms a covalent adduct with topoisomerase IIalpha. In conclusion, the present characterization of the chemical, biochemical, and biological properties of the newly synthesized diazirine-based photoaffinity etoposide analog indicates that use of a proteomics mass spectrometry approach will be a tractable strategy for future identification of the etoposide binding site(s) on topoisomerase II through covalent labeling of amino acid residues.
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Zhao L, Liu ZL, Fan PC, Zhang ZW, Liu X, Zhan YJ, Tian X. HPLC-DAD and HPLC-ESI-MS separation, determination and identification of the spin-labeled diastereoisomers of podophyllotoxin. J Sep Sci 2009; 32:1323-32. [DOI: 10.1002/jssc.200800674] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Separation, determination and identification of the diastereoisomers of podophyllotoxin and its esters by high-performance liquid chromatography/tandem mass spectrometry. J Chromatogr A 2008; 1210:168-77. [DOI: 10.1016/j.chroma.2008.09.057] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2008] [Revised: 09/05/2008] [Accepted: 09/15/2008] [Indexed: 11/18/2022]
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Li Q, Yan G, Ge T. A fragmentation study of two compounds related to 4'-demethylepipodophyllotoxin in negative ion electrospray ionization by MSn ion-trap time-of-flight mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2008; 22:373-8. [PMID: 18183636 DOI: 10.1002/rcm.3366] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
High-resolution electrospray ionization multistage tandem mass spectrometry (MS 1-7) in negative ion mode was used to determine the accurate masses and fragmentation pathways of two compounds, 4'-demethylepipodophyllotoxin and 4'-demethyl-4-azido-4-deoxyepipodophyllotoxin, which are key intermediate compounds for the preparation of podophyllotoxin-type anti-cancer drugs. The deprotonated molecules [M-H]* of both compounds were readily observed in the conventional single-stage mass spectra due to the presence of the phenolic hydroxyl group in the molecules. Abundant information on the product ions was obtained from tandem mass spectra (MS 2-7) in negative ion mode. Based on the exact masses acquired from 14 different tandem mass spectra, a similar MSn fragmentation pathway was proposed for both compounds. A characteristic product ion produced in the MS 2-4 product ion scan experiments is the cyclohexylenetrione anion [M-H-2Me-RH]* or [M-H-RH-2Me]* at m/z 351 (C19H11O7) formed by the consecutive losses of two CH3 radicals at the 3'- and 5'-positions and the neutral loss of RH, where R = a 4-substituted group (-OH or -N3), from the [M-H]* ion. This anion may be considered as diagnostic for the presence of this type of compound. The other common cleavages are the neutral losses of CO at least two times in the MS 6,7 product ion spectra. The results of this work could serve as an effective tool for the detection or determination of other derivatives of 4'-demethyl-4beta-substituted podophyllotoxin, which are widely used as intermediates for the preparation of anti-tumor drugs.
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Affiliation(s)
- Qianrong Li
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.
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Yan G, Li Q, Tan H, Ge T. Electrospray ionization ion-trap time-of-flight tandem mass spectrometry of two furofurans: sesamin and gmelinol. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2007; 21:3613-3620. [PMID: 17939160 DOI: 10.1002/rcm.3243] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
High-resolution electrospray ionization multistage tandem mass spectrometry (MS(1-7)) in positive ion mode was used to determine the accurate masses and the fragmentation pathways of two furofurans, sesamin and gmelinol. The protonated molecules [M+H]+ were absent in the conventional mass spectra of both compounds, but two characteristic ions, [M+H-H(2)O]+ and [M+H-H(2)]+, were always observed. Successive losses of CH(2)O and CO are the common characteristic fragmentations. Based on the exact masses acquired from 21 different tandem mass spectra, two or three fragmentation pathways for each compound are proposed. The consecutive losses of two H(2)O molecules and one H(2) molecule readily take place from the furan rings for both sesamin and gmelinol, resulting in the absence of the protonated molecules in the single-stage experiments. HCHO loss is observed at least three times in the tandem mass spectra, mainly from methylenedioxy groups (OCH(2)O) for sesamin but only from tetrahydrofuran rings for gmelinol. Moreover, CO loss is found at least three times in the tandem mass spectra of both sesamin and gmelinol from the 3,4-methylenedioxyphenyl (ArOCH(2)O) moieties for sesamin and from both the dimethoxyphenyl and the tetrahydrofuran ring moieties for gmelinol. In addition, the disubstituted benzyl cation ArCH(2)+ at m/z 135 for sesamin and at m/z 151 for gmelinol was found in the MS(3) spectra of both sesamin and gmelinol, which is very helpful in the identification of the compositions of 3,4-disubstituted groups on the benzene rings of the furofurans.
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Affiliation(s)
- Guoquan Yan
- Institutes of Biomedical Sciences, Fudan University, Shanghai 200032, China
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