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A Natural Glucan from Black Bean Inhibits Cancer Cell Proliferation via PI3K-Akt and MAPK Pathway. Molecules 2023; 28:molecules28041971. [PMID: 36838963 PMCID: PMC9961350 DOI: 10.3390/molecules28041971] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 02/12/2023] [Accepted: 02/15/2023] [Indexed: 02/22/2023] Open
Abstract
A natural α-1,6-glucan named BBWPW was identified from black beans. Cell viability assay showed that BBWPW inhibited the proliferation of different cancer cells, especially HeLa cells. Flow cytometry analysis indicated that BBWPW suppressed the HeLa cell cycle in the G2/M phase. Consistently, RT-PCR experiments displayed that BBWPW significantly impacts the expression of four marker genes related to the G2/M phase, including p21, CDK1, Cyclin B1, and Survivin. To explore the molecular mechanism of BBWPW to induce cell cycle arrest, a transcriptome-based target inference approach was utilized to predict the potential upstream pathways of BBWPW and it was found that the PI3K-Akt and MAPK signal pathways had the potential to mediate the effects of BBWPW on the cell cycle. Further experimental tests confirmed that BBWPW increased the expression of BAD and AKT and decreased the expression of mTOR and MKK3. These results suggested that BBWPW could regulate the PI3K-Akt and MAPK pathways to induce cell cycle arrest and ultimately inhibit the proliferation of HeLa cells, providing the potential of the black bean glucan to be a natural anticancer drug.
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Ishwarya R, Tamilmani G, Jeyakumar R, Albeshr MF, Mahboob S, Shahid D, Riaz MN, Govindarajan M, Vaseeharan B. Synthesis of zinc oxide nanoparticles using Vigna mungo seed husk extract: An enhanced antibacterial and anticancer activity and eco-friendly bio-toxicity assessment on algae and zooplankton. J Drug Deliv Sci Technol 2022. [DOI: 10.1016/j.jddst.2022.104002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Hypoglycemic efficacy and safety of Momordica charantia (bitter melon) in patients with type 2 diabetes mellitus. Complement Ther Med 2020; 52:102524. [DOI: 10.1016/j.ctim.2020.102524] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 07/09/2020] [Accepted: 07/19/2020] [Indexed: 01/03/2023] Open
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Fahmy NM, Al-Sayed E, Michel HE, El-Shazly M, Singab ANB. Gastroprotective effects of Erythrina speciosa (Fabaceae) leaves cultivated in Egypt against ethanol-induced gastric ulcer in rats. JOURNAL OF ETHNOPHARMACOLOGY 2020; 248:112297. [PMID: 31606535 DOI: 10.1016/j.jep.2019.112297] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 10/07/2019] [Accepted: 10/09/2019] [Indexed: 06/10/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Members of the genus Erythrina have been traditionally used in the treatment of various ailments such as inflammation and gastrointestinal disorders. Erythrina speciosa (Fabaceae) is a spiny, deciduous shrub or small tree native to Southern America in Brazil. It is cultivated in Africa and Asia. The traditional usage of E. speciosa indicated its antibacterial, analgesic, and anti-inflammatory activities. AIM OF THE STUDY Evaluation of the phytochemical constituents, gastroprotective effects and possible mechanism of action of the ethyl acetate fraction obtained from the methanol extract of E. speciosa leaves (ESLE). MATERIALS AND METHODS Chemical characterization of ESLE was done using high performance liquid chromatography coupled to mass spectrometry (HPLC-MS). The gastroprotective activity of ESLE was evaluated using ethanol-induced gastric-ulcer model in rats. Rats were pre-treated with ESLE 25, 50 and 100 mg/kg 1 h before the administration of absolute ethanol. Histological analysis, mucin content, and total acidity were evaluated. The possible mechanism of action of ESLE was studied through the examination of oxidative stress and inflammatory markers, PGE2, and NF-κB, iNOS, COX-2, and HSP-70 immunoexpression. In vitro, anti-Helicobacter pylori activity of ESLE was also studied using micro-well dilution method. RESULTS Fourteen compounds were tentatively identified including alkaloids, flavonoids, and saponins. ESLE exerted a powerful gastroprotective effect. The pre-treatment with ESLE at different doses resulted in a significant reduction in gastric lesions and significant elevation in the mucin production. These effects could be partially mediated by the potent anti-inflammatory activity of ESLE as evidenced by the significant reduction in the immunoexpression of NF-κB, COX-2, iNOS and the reduction in the pro-inflammatory marker, TNF-α. ESLE counteracted the ethanol-induced oxidative stress by increasing the levels of depleted GSH and catalase as well as significantly attenuating the ethanol-induced lipid peroxidation tissue levels. In addition, ESLE exhibited in vitro antibacterial activity against H. pylori. CONCLUSIONS The chemical constituents of ESLE strongly support its potent gastroprotective effect suggesting its future potential application in the management of gastric ulcer by eliminating its symptoms and causes including H. pylori.
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Affiliation(s)
- Nouran M Fahmy
- Department of Pharmacognosy, Faculty of Pharmacy, Ain-Shams University, Cairo, 11566, Egypt
| | - Eman Al-Sayed
- Department of Pharmacognosy, Faculty of Pharmacy, Ain-Shams University, Cairo, 11566, Egypt
| | - Haidy E Michel
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt
| | - Mohamed El-Shazly
- Department of Pharmacognosy, Faculty of Pharmacy, Ain-Shams University, Cairo, 11566, Egypt; Department of Pharmaceutical Biology, Faculty of Pharmacy and Biotechnology, German University in Cairo, Cairo, 11835, Egypt.
| | - Abdel Nasser B Singab
- Department of Pharmacognosy, Faculty of Pharmacy, Ain-Shams University, Cairo, 11566, Egypt; Centre for Drug Discovery and Development Research, Ain Shams University, Cairo, Egypt.
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Balestri F, De Leo M, Sorce C, Cappiello M, Quattrini L, Moschini R, Pineschi C, Braca A, La Motta C, Da Settimo F, Del-Corso A, Mura U. Soyasaponins from Zolfino bean as aldose reductase differential inhibitors. J Enzyme Inhib Med Chem 2019; 34:350-360. [PMID: 30734590 PMCID: PMC6327985 DOI: 10.1080/14756366.2018.1553166] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Seven triterpenoid saponins were identified in methanolic extracts of seeds of the Zolfino bean landrace (Phaseolus vulgaris L.) by HPLC fractionation, revealing their ability to inhibit highly purified human recombinant aldose reductase (hAKR1B1). Six of these compounds were associated by MS analysis with the following saponins already reported in different Phaseolus vulgaris varieties: soyasaponin Ba (V), soyasaponin Bb, soyasaponin Bd (sandosaponin A), soyasaponin αg, 3-O-[R-l-rhamnopyranosyl(1 → 2)-α-d-glucopyranosyl(1 → 2)-α-d-glucuronopyranosyl]olean-12-en-22-oxo-3α,-24-diol, and soyasaponin βg. The inhibitory activity of the collected fractions containing the above compounds was tested for hAKR1B1-dependent reduction of both l-idose and 4-hydroxynonenal, revealing that some are able to differentially inhibit the enzyme. The present work also highlights the difficulties in the search for aldose reductase differential inhibitors (ARDIs) in mixtures due to the masking effect on ARDIs exerted by the presence of conventional aldose reductase inhibitors. The possibility of differential inhibition generated by a different inhibitory model of action of molecules on different substrates undergoing transformation is also discussed.
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Affiliation(s)
- Francesco Balestri
- a Department of Biology , University of Pisa , Pisa , Italy.,b Interdepartmental Research Center Nutrafood ''Nutraceuticals and Food for Health'' , University of Pisa , Pisa , Italy
| | - Marinella De Leo
- b Interdepartmental Research Center Nutrafood ''Nutraceuticals and Food for Health'' , University of Pisa , Pisa , Italy.,c Department of Pharmacy , University of Pisa , Pisa , Italy
| | - Carlo Sorce
- a Department of Biology , University of Pisa , Pisa , Italy.,b Interdepartmental Research Center Nutrafood ''Nutraceuticals and Food for Health'' , University of Pisa , Pisa , Italy
| | - Mario Cappiello
- a Department of Biology , University of Pisa , Pisa , Italy.,b Interdepartmental Research Center Nutrafood ''Nutraceuticals and Food for Health'' , University of Pisa , Pisa , Italy
| | - Luca Quattrini
- c Department of Pharmacy , University of Pisa , Pisa , Italy
| | - Roberta Moschini
- a Department of Biology , University of Pisa , Pisa , Italy.,b Interdepartmental Research Center Nutrafood ''Nutraceuticals and Food for Health'' , University of Pisa , Pisa , Italy
| | - Carlotta Pineschi
- d PhD School in Biochemistry and Molecular Biology , University of Siena, Siena, Italy
| | - Alessandra Braca
- b Interdepartmental Research Center Nutrafood ''Nutraceuticals and Food for Health'' , University of Pisa , Pisa , Italy.,c Department of Pharmacy , University of Pisa , Pisa , Italy
| | - Concettina La Motta
- b Interdepartmental Research Center Nutrafood ''Nutraceuticals and Food for Health'' , University of Pisa , Pisa , Italy.,c Department of Pharmacy , University of Pisa , Pisa , Italy
| | | | - Antonella Del-Corso
- a Department of Biology , University of Pisa , Pisa , Italy.,b Interdepartmental Research Center Nutrafood ''Nutraceuticals and Food for Health'' , University of Pisa , Pisa , Italy
| | - Umberto Mura
- a Department of Biology , University of Pisa , Pisa , Italy.,b Interdepartmental Research Center Nutrafood ''Nutraceuticals and Food for Health'' , University of Pisa , Pisa , Italy
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Varadavenkatesan T, Vinayagam R, Selvaraj R. Structural characterization of silver nanoparticles phyto-mediated by a plant waste, seed hull of Vigna mungo and their biological applications. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.07.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Singh B, Singh JP, Singh N, Kaur A. Saponins in pulses and their health promoting activities: A review. Food Chem 2017; 233:540-549. [PMID: 28530610 DOI: 10.1016/j.foodchem.2017.04.161] [Citation(s) in RCA: 115] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 04/04/2017] [Accepted: 04/25/2017] [Indexed: 01/17/2023]
Abstract
Saponins are a class of natural compounds present in pulses having surface active properties. These compounds show variation in type, structure and composition of their aglycone moiety and oligosaccharide chains. Saponins have plasma cholesterol lowering effect in humans and are important in reducing the risk of many chronic diseases. Moreover, they have shown strong cytotoxic effects against cancer cell lines. However, more epidemiological and clinical studies are required for the proper validation of these health promoting activities. Processing and cooking promotes the loss of saponins from foods. The effect of soaking, sprouting and cooking on the stability and bioavailability of saponins in pulses is an important area which should be thoroughly worked out for achieving desirable health benefits. In the present review, the structures, contents and health benefits of saponins present in pulses are discussed. Moreover, the effect of processing (of pulses) on the saponins is also highlighted.
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Affiliation(s)
- Balwinder Singh
- Department of Biotechnology, Khalsa College, Amritsar 143002, Punjab, India
| | - Jatinder Pal Singh
- Department of Food Science and Technology, Guru Nanak Dev University, Amritsar 143005, Punjab, India
| | - Narpinder Singh
- Department of Food Science and Technology, Guru Nanak Dev University, Amritsar 143005, Punjab, India
| | - Amritpal Kaur
- Department of Food Science and Technology, Guru Nanak Dev University, Amritsar 143005, Punjab, India.
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Bianco G, Buchicchio A, Cataldi TRI. Structural characterization of major soyasaponins in traditional cultivars of Fagioli di Sarconi beans investigated by high-resolution tandem mass spectrometry. Anal Bioanal Chem 2015; 407:6381-9. [PMID: 26065561 DOI: 10.1007/s00216-015-8810-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Revised: 05/18/2015] [Accepted: 05/27/2015] [Indexed: 01/06/2023]
Abstract
Major soyasaponins, i.e., soyasaponins I, V, βg, and αg from traditional Fagioli di Sarconi beans (Phaseolus vulgaris L., ecotype Tabacchino), were analyzed by reversed-phase liquid chromatography-mass spectrometry (MS) using high-resolution Fourier transform ion cyclotron resonance (FTICR) MS on electrospray ionization in positive-ion mode. Fagioli di Sarconi beans are protected by the European Union [Commission Regulation (EC) No 1263/96] with the mark PGI (for "Protected Geographical Indication"), and are cultivated in Basilicata (southern Italy). Protonated adducts of soyasaponins I, V, βg, and αg were observed at m/z 943.5262, 959.5213, 1069.5583, and 1085.5534, respectively. Gas-phase dissociation of soyasaponins by infrared multiphoton dissociation FTICR MS was performed using a CO2 laser source at a wavelength of 10.6 μm. Most of the fragment ions were identified unambiguously by using the high-resolution and accurate mass value provided by the FTICR mass spectrometer. All soyasaponins exhibit a sequential and neutral loss of sugar moieties at relatively short irradiation times (i.e., less than 50 ms). When the pulse length was increased, a more pronounced fragmentation occurred, with several signals in the lower part of the mass spectrum. In the case of soyasaponins βg and αg, the occurrence of the conjugated product ion at m/z 127.0389 ([C6H6O3 + H](+), 2,3-dihydro-2,5-dihydroxy-6-methyl-4H-pyran-4-one) was evidenced. Coupling reversed-phase liquid chromatography with high-performance FTICR MS in combination with infrared multiphoton dissociation tandem MS proved to be very promising for the structural characterization of soyasaponins, and is also suitable for the rapid and accurate structural investigation of other saponins. Graphical Abstract Representative Infrared Multiphoton Dissociation (IRMPD)-FTICR MS spectra of main group B saponins in Fagioli di Sarconi beans.
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Affiliation(s)
- Giuliana Bianco
- Dipartimento di Scienze, Università degli Studi della Basilicata, Via dell'Ateneo Lucano 10, 85100, Potenza, Italy,
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Lomas-Soria C, Pérez-Ramírez IF, Caballero-Pérez J, Guevara-Gonzalez RG, Guevara-Olvera L, Loarca-Piña G, Guzman-Maldonado HS, Reynoso-Camacho R. Cooked common beans (Phaseolus vulgaris L.) modulate renal genes in streptozotocin-induced diabetic rats. J Nutr Biochem 2015; 26:761-8. [PMID: 25863648 DOI: 10.1016/j.jnutbio.2015.02.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Revised: 01/07/2015] [Accepted: 02/10/2015] [Indexed: 01/12/2023]
Abstract
Food consumption with different bioactive compounds could reduce the risk of diabetic complications. This study was designed to evaluate the effect of cooked common beans on differentially expressed genes in whole kidney homogenates of streptozotocin-induced diabetic rats. After 4weeks of treatment with a cooked bean supplemented (10%) diet, animals fed with Flor de Mayo bean (FMB) exerted the greatest protective effect, since they presented the lowest blood glucose levels, consistent with an increase in blood insulin levels, a decrease in urine albumin and urea levels and an increase in creatinine clearance (P≤.05). Regarding the gene expression of kidneys evaluated using expressed sequence tag, consumption of cooked beans improved the expression of Glu1, Cps1, Ipmk, Cacna1c, Camk1, Pdhb, Ptbp3 and Pim1, which are related to the elimination of ammonium groups, the regulation of inflammatory and oxidative response, as well as cell signaling and apoptosis. In addition, the beneficial effects observed were not related to their polyphenolic and saponin profile, suggesting the activity of other bioactive compounds or the synergistic interaction of these compounds. These results suggest that the consumption of cooked common beans (FMB) might be used as an alternative for the regulation of genes related to renal alterations.
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Affiliation(s)
- Consuelo Lomas-Soria
- Programa de Alimentos del Centro de la República PROPAC, Research and Graduate Studies in Food Science, School of Chemistry, Autonomous University of Queretaro, Cerro de las Campanas, S/N, 76010 Querétaro, Qro., México
| | - Iza F Pérez-Ramírez
- Programa de Alimentos del Centro de la República PROPAC, Research and Graduate Studies in Food Science, School of Chemistry, Autonomous University of Queretaro, Cerro de las Campanas, S/N, 76010 Querétaro, Qro., México
| | - Juan Caballero-Pérez
- C.A. Biosystems Engineering, School of Engineering, Autonomous University of Querétaro, Cerro de las Campanas, S/N, 76010 Querétaro, Qro., México
| | - Ramón G Guevara-Gonzalez
- C.A. Biosystems Engineering, School of Engineering, Autonomous University of Querétaro, Cerro de las Campanas, S/N, 76010 Querétaro, Qro., México
| | - Lorenzo Guevara-Olvera
- Molecular Biology Laboratory, Biochemical Engineering Department, Celaya Technological Institute, Av. Tecnológico y Antonio García Cubas s/n, 38010 Celaya, Guanajuato, México
| | - Guadalupe Loarca-Piña
- Programa de Alimentos del Centro de la República PROPAC, Research and Graduate Studies in Food Science, School of Chemistry, Autonomous University of Queretaro, Cerro de las Campanas, S/N, 76010 Querétaro, Qro., México
| | - Horacio S Guzman-Maldonado
- Campo experimental Bajío (CEBAJ-INIFAP), Km 6 Carretera Celaya San Miguel de Allende, 38010 Celaya, México
| | - Rosalía Reynoso-Camacho
- Programa de Alimentos del Centro de la República PROPAC, Research and Graduate Studies in Food Science, School of Chemistry, Autonomous University of Queretaro, Cerro de las Campanas, S/N, 76010 Querétaro, Qro., México.
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Anti-nutrient components and metabolites with health implications in seeds of 10 common bean (Phaseolus vulgaris L. and Phaseolus lunatus L.) landraces cultivated in southern Italy. J Food Compost Anal 2012. [DOI: 10.1016/j.jfca.2012.03.005] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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13
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Li F, Liu X, Tang M, Chen B, Ding L, Chen L, Wang M. Structure revision of hupehensis saponin F and G and characterization of new trace triterpenoid saponins from Anemone hupehensis by tandem electrospray ionization mass spectrometry. Carbohydr Res 2012; 353:49-56. [DOI: 10.1016/j.carres.2012.03.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2012] [Revised: 03/14/2012] [Accepted: 03/19/2012] [Indexed: 10/28/2022]
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Characterization and quantification of saponins and flavonoids in sprouts, seed coats and cotyledons of germinated black beans. Food Chem 2012; 134:1312-9. [PMID: 25005948 DOI: 10.1016/j.foodchem.2012.03.020] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2011] [Revised: 02/17/2012] [Accepted: 03/06/2012] [Indexed: 11/21/2022]
Abstract
Saponins, flavonols and isoflavones were quantified in sprouts, cotyledons and seed coats of black beans (Phaseolus vulgaris L.) subjected to germination over five days. Sprouts had a higher concentration of saponins compared to cotyledons or seed coats (p<0.05). The saponins concentration in hilum increased 2.3-fold after soaking. After the first day of germination, the saponin concentration in sprouts and cotyledons increased 1.9 and 2.1-fold, respectively. Additional germination days decreased the amount of the most abundant soyasaponins in black bean sprouts. Flavonols and isoflavones were associated with seed coats and less than one third of the initial amount remained after the soaking process. The concentrations of flavonols were also reduced during germination process. Aglycones were detected only after soaking and their concentration remained unchanged during germination. Genistein was detected only after three days of germination. In general, one-day germinated black beans could be recommended for increasing the concentration of saponins and non-glycosylated flavonols in sprouts and seed coats, respectively.
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Tan G, Jing J, Zhu Z, Lou Z, Li W, Zhao L, Zhang G, Chai Y. Detection and identification of diterpenoid alkaloids, isoflavonoids and saponins in Qifu decoction and rat plasma by liquid chromatography-time-of-flight mass spectrometry. Biomed Chromatogr 2011; 26:178-91. [PMID: 21594877 DOI: 10.1002/bmc.1644] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2011] [Accepted: 04/04/2011] [Indexed: 11/06/2022]
Abstract
A liquid chromatography-time-of-flight mass spectrometric (LC-TOFMS) method has been developed for analysis of components in Qifu decoction (QFD), a traditional Chinese medical formula consisting of Radix Astragali and Acontium carmichaeli, and in rat plasma after oral administration. Based on accurate mass measurements within 3 ppm error for each molecular ion and subsequent fragment ions of TOFMS, as well as matching of empirical molecular formulae with those of published components in the in-house chemical library, a total of 44 major components including 21 diterpenoid alkaloids, 12 flavonoids and 11 saponins were identified in QFD. After oral administration of QFD, 22 components in rat plasma were detected and identified by comparing and contrasting the constituents measured in QFD with those in the plasma samples. The results provided valuable chemical information for further pharmacology and active mechanism research on QFD. LC-TOFMS was also applied for the comparison of relative peak area of major active components between QFD and the single herb extracts. The concentration ratios of major saponins detected in the crude herb Radix Astragali were found to be different from those in QFD. The experimental data indicated that the decocting process could result in differences in the amounts of active components.
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Affiliation(s)
- Guangguo Tan
- Department of Pharmaceutical Analysis, School of Pharmacy, Second Military Medical University, Shanghai 200433, China
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Zhang W, Popovich DG. Behaviour of soyasapogenol B under optimised hydrolysis and ESI mass spec conditions. Food Chem 2010. [DOI: 10.1016/j.foodchem.2010.05.050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Zhang W, Popovich DG. Chemical and biological characterization of oleanane triterpenoids from soy. Molecules 2009; 14:2959-75. [PMID: 19701138 PMCID: PMC6255087 DOI: 10.3390/molecules14082959] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2009] [Revised: 07/21/2009] [Accepted: 08/06/2009] [Indexed: 11/16/2022] Open
Abstract
Soyasaponins are a group of complex and structural diverse oleanane triterpenoids found in soy (Glycine max) and other legumes. They are primarily classified into two main groups - group A and B - based on the attachment of sugar moieties at positions C-3 and C-22 of the ring structures. Group A soyasaponins are bidesmosidic, while group B soyasaponins are monodesmosidic. Group B soyasaponins are further classified into two subcategories known as 2,3-dihydro-2,5-dihydroxy-6-methyl-4H-pyran-4-one (DDMP) and non-DDMP conjugated molecules. The preparation and purification of soyasaponin molecules is complicated by the presence of bioactive soy isoflavones, which often overlap with soyasaponin in polarity and must removed from extracts before biological assessment. Soyasaponin extracts, aglycones of group A and B and individual group B soyasaponins such as soyasaponin I have been reported to posses specific bioactive properties, such as in vitro anti-cancer properties by modulating the cell cycle and inducing apoptosis. The isolation, chemical characterization and detection strategies by HPLC and HPLC-MS are reviewed, along with the reported bioactive effects of soyasaponin extracts and individual molecules in cultured cancer cell experiments.
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Affiliation(s)
| | - David G. Popovich
- Department of Chemistry, National University of Singapore, Science Drive 4, 117543, Singapore
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Liu EH, Qi LW, Peng YB, Cheng XL, Wu Q, Li P, Li CY. Rapid separation and identification of 54 major constituents in Buyang Huanwu decoction by ultra-fast HPLC system coupled with DAD-TOF/MS. Biomed Chromatogr 2009; 23:828-42. [DOI: 10.1002/bmc.1193] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Chen J, He S, Mao H, Sun C, Pan Y. Characterization of polyphenol compounds from the roots and stems of Parthenocissus laetevirens by high-performance liquid chromatography/tandem mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2009; 23:737-744. [PMID: 19204932 DOI: 10.1002/rcm.3937] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A facile method based on high-performance liquid chromatography coupled with electrospray ionization tandem mass spectrometry (HPLC/(-)ESI-MSn) has been established for the analyses of polyphenol compounds in the root and stems of Parthenocissus laetevirens. Two characteristic fragments [C3O2 (68 Da) and C2H2O (42 Da)] were utilized for the structural identification of polyphenols. Based on the reference standards, the fragment C3O2 was presented when the compound possessed a 2,3-dihydro-1H-indene-4, 6-diol moiety. Meanwhile, the C2H2O fragment (42 Da) yielded from the resorcinol ring was confirmed by resveratrol and three synthesized compounds identified as (E)-5-styrylbenzene-1,3-diol, (E)-4-styrylphenol and (E)-4-(3,4,5-trimethoxystyryl)phenol. FTICR-MSn was performed to further confirm the structures of the fragments. Overall, 15 polyphenol compounds were characterized. Three polyphenol compounds were initially and tentatively characterized from P. laetevirens for the first time, and one was proposed as a novel compound. Furthermore, a pair of stereoisomers was readily distinguished by breakdown curves, and the trans-, cis-isomers could be identified by HPLC/DAD-UV spectra.
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Affiliation(s)
- Juanjuan Chen
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
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Balsevich JJ, Bishop GG, Deibert LK. Use of digitoxin and digoxin as internal standards in HPLC analysis of triterpene saponin-containing extracts. PHYTOCHEMICAL ANALYSIS : PCA 2009; 20:38-49. [PMID: 18819105 DOI: 10.1002/pca.1095] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
INTRODUCTION Saponins are widely distributed complex plant glycosides possessing a variety of structure-dependent bioactivities. Quantitation of individual saponins is difficult due to lack of available standards, mainly as a consequence of purification difficulties. Determination of total saponin content can be problematic, often relying on non-specific methods based on butanol solubility, haemolytic activity or formation of coloured derivatives. OBJECTIVE To develop a general quantitative method based on the use of the readily available cardenolides, digitoxin (1) and digoxin (2), as internal standards in an HPLC-PAD-based analysis. METHODOLOGY The cardenolides were run at a variety of concentrations to establish linearity and reproducibility of detector response and then evaluated as internal standards for quantitation of triterpene saponins in several plant-derived extracts by HPLC-PAD. Mixtures of saponins, largely freed from other extractables, were obtained by fractionation of total extracts on solid phase extraction columns (SPE) employing a water-methanol gradient and used for construction of calibration curves. Saponin identification and structural information was obtained via a single quadrupole mass detector using electrospray ionisation in negative ion mode (ESI(-)). RESULTS Saponin contents in six samples from five species were determined and compared with literature results and a gravimetric method based on butanol-water partitioning. Results were generally consistent with literature reports and superior to gravimetric butanol-water partitioning. CONCLUSION Digitoxin and digoxin are useful as internal standards in HPLC estimation of saponin content. Saponins from different species having similar structures and molecular weights afford similar calibration curves.
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Affiliation(s)
- J John Balsevich
- Plant Biotechnology Institute, National Research Council of Canada, 110 Gymnasium Place, Saskatoon, SK, Canada
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Lee MK, Ahn YM, Lee KR, Jung JH, Jung OS, Hong J. Development of a validated liquid chromatographic method for the quality control of Prunellae Spica: determination of triterpenic acids. Anal Chim Acta 2008; 633:271-7. [PMID: 19166733 DOI: 10.1016/j.aca.2008.12.038] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2008] [Revised: 11/24/2008] [Accepted: 12/19/2008] [Indexed: 10/21/2022]
Abstract
A simple and rapid reversed-phase HPLC-UV method was developed for the determination of triterpenic acids in the crude extract of Prunellae Spica. Five triterpenic acids were extracted and isolated from P. Spica as marker compounds for use in the quality control of herbal medicines. Various solvent extraction techniques were evaluated, and the greatest efficiency was observed with sonication in 100% ethanol. Elemental compositions of the five marker compounds were determined by high-resolution mass spectroscopy. The dynamic range of the HPLC-UV method depended on the specific analyte, and acceptable quantitation was obtained between 10 and 250 microgmL(-1) for oleanolic acid, between 10 and 300 microgmL(-1) for ursolic acid, between 3 and 75 microgmL(-1) for 2alpha,3alpha,24-trihydroxyolean-12en-28oic acid, between 5 and 100 microgmL(-1) for euscaphic acid, and between 5 and 100 microgmL(-1) for 2alpha,3alpha-dihydroxyurs-12en-28oic acid. The method was deemed satisfactory by inter- and intra-day validation and exhibited both high accuracy and precision (relative standard deviation <9.4%). Overall limits of quantitation and detection were approximately 0.5-2.5 microgmL(-1) at a signal-to-noise ratio (S/N) of 3 and were about 3.0-10.0 microgmL(-1) at a S/N of 10. In addition, principal component analysis (PCA) was performed on the analytical data of 15 different P. Spica samples in order to classify samples collected from different regions.
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Affiliation(s)
- Mi Kyoung Lee
- College of Pharmacy, Kyung Hee University, Hoegi-Dong, Dongdaemoon-Ku, Seoul 130-701, South Korea
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Qi LW, Wen XD, Cao J, Li CY, Li P, Yi L, Wang YX, Cheng XL, Ge XX. Rapid and sensitive screening and characterization of phenolic acids, phthalides, saponins and isoflavonoids in Danggui Buxue Tang by rapid resolution liquid chromatography/diode-array detection coupled with time-of-flight mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2008; 22:2493-2509. [PMID: 18651584 DOI: 10.1002/rcm.3638] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A novel rapid resolution liquid chromatography (RRLC) method coupled with diode-array detection (DAD) and time-of-flight mass spectrometry (TOFMS) in both positive and negative modes has been developed for quick and sensitive identification of the major compounds in Danggui Buxue Tang (DBT) preparation. Significant advantages of the use of RRLC with 1.8-microm porous particles include the much higher speed of chromatographic separation and great enhancement in sensitivity, compared with the conventional high-performance liquid chromatography (HPLC). With dynamic adjustment of the key role as fragmentor voltage in TOFMS, an efficient transmission of the ions was achieved to obtain the best sensitivity for providing the molecular formula for each analyte, and abundant fragment ions for structural information. The structural characterization of the major compounds in DBT was elucidated with authentic standards by DAD-TOF/MS, including phenolic acids, phthalides, saponins and isoflavonoids. The targets were rapidly screened from the complicated DBT matrix using a narrow mass window of 0.01 Da to restructure extracted ion chromatograms. By accurate mass measurements within 3 ppm error for each molecular ion and subsequent fragment ions, ten phenolic acids and phthalides including three groups of isomers, thirteen major saponins with a 20,24-epoxy-9,19-cyclolanostane-3,6,16,25-tetrol skeleton, sixteen isoflavonoids, corresponding glycosides, malonylglycosides, and acetylglycosides were identified in DBT preparation. The appropriate fragmentation pathways for them were also proposed based on definite elemental composition of the fragment ions.
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Affiliation(s)
- Lian-Wen Qi
- Key Laboratory of Modern Chinese Medicines (China Pharmaceutical University), Ministry of Education, Nanjing 210009, China
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Chen J, Ye Y, Sun C, Pan Y. Rapid identification of oleanane-type saponins in the roots of Stephanotis mucronata by liquid chromatography/electrospray tandem mass spectrometry. Anal Chim Acta 2008; 613:74-82. [DOI: 10.1016/j.aca.2008.02.052] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2008] [Revised: 02/26/2008] [Accepted: 02/26/2008] [Indexed: 12/01/2022]
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Chapagain BP, Wiesman Z. Determination of saponins in the kernel cake of Balanites aegyptiaca by HPLC-ESI/MS. PHYTOCHEMICAL ANALYSIS : PCA 2007; 18:354-62. [PMID: 17623371 DOI: 10.1002/pca.990] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
The kernel cake produced from Balanites aegyptiaca fruit of Israeli origin was analysed for its saponin constituents using high-performance liquid chromatography-mass spectrometry (HPLC-MS). The HPLC was equipped with a reversed-phase C18 column and a refractive index detector (RID), and elution was isocratic with methanol and water (70:30). The MS system was equipped with electrospray ionisation (ESI). Nine compounds were chromatographically separated, their masses were determined in the negative ion mode and subsequent fragmentation of each component was carried out. From the nine components, six saponins with molecular masses of 1196, 1064, 1210, 1224, 1078 and 1046 Da were identified, with the compound of mass 1210 Da being the main saponin (ca. 36%). Saponins with masses of 1224 and 1046 Da have not been previously reported in B. aegyptiaca. In all saponins, diosgenin was found to be the sole aglycone. This study shows that HPLC-ESI/MS is a quick and reliable technique for characterizing the saponins from kernel cake of B. aegyptiaca.
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Affiliation(s)
- Bishnu P Chapagain
- The Phyto-Lipid Biotechnology Laboratory, the Institutes for Applied Research, Ben-Gurion University of the Negev, Beer-Sheva, Israel
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Balsevich JJ, Bishop GG, Ramirez-Erosa I. Analysis of bisdesmosidic saponins in Saponaria vaccaria L. by HPLC-PAD-MS: identification of new quillaic acid and gypsogenin 3-O-trisaccharides. PHYTOCHEMICAL ANALYSIS : PCA 2006; 17:414-23. [PMID: 17144250 DOI: 10.1002/pca.943] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
A high-performance liquid chromatographic method using photodiode array and single quadrupole electrospray mass detection for analysis and profiling of bisdesmosidic saponins in Saponaria vaccaria seed was developed. Profiles of seed extract from three different plant sources were obtained and found to contain the same saponins, albeit in different proportions. Several known saponins were identified by selected ion extraction of quasi-molecular ions from the total ion chromatogram and confirmed by their mass spectra. Application of high cone voltages afforded mass spectra containing key diagnostic fragments and relatively strong singly charged quasi-molecular ions. In addition to previously identified saponins, several new quillaic acid and gypsogenin bisdesmosides could be detected via mass spectral analysis. Five of these were tentatively identified as pentose homologues of known saponins, having an added xylosyl residue linked to the 3-O-glucuronyl group (1 --> 3). The stereochemistry and identity of the xylosyl linkage in the new saponins was determined by chemical means. Previously reported vaccaric or segetalic acid-type bisdesmosides could not be detected in any of the extracts.
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Affiliation(s)
- J John Balsevich
- Plant Biotechnology Institute, National Research Council of Canada, 110 Gymnasium Place, Saskatoon, Saskatchewan, Canada S7N OW9.
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Oleszek W, Bialy Z. Chromatographic determination of plant saponins—An update (2002–2005). J Chromatogr A 2006; 1112:78-91. [PMID: 16451803 DOI: 10.1016/j.chroma.2006.01.037] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2005] [Revised: 01/09/2006] [Accepted: 01/12/2006] [Indexed: 10/25/2022]
Abstract
The developments during 2002-2005 in the methods used for saponin analyses in plant material are presented. There were number of papers published on isolation and identification of new saponins by chromatographic techniques. Some new developments can be found in separation techniques or solid and mobiles phases used. Separation of individual saponins is still complicated and time consuming. This is due to the fact that in most of the plant species saponins occur as a multi-component mixture of compounds of very similar polarities. Thus, to isolate single compound for structure elucidation or biological activity testing, a combination of different chromatographic techniques has to be used, e.g. first separation of the mixture to simpler sub-fractions on reversed phase C18 has to be followed by further purification on normal phase Silica gel column. Especially difficult is determination of saponins in plant material as these compounds do not possess chromophores and their profiles cannot be registered in UV. Most HPLC methods apply not only specific registration at 200-210 nm, but these methods are not applicable for determination of many saponins in plant material at levels lower than 200-300 mg/kg. Some new or improved techniques for quantification of saponins in plant material were published in reviewed period. These include further progress in the application of evaporative light scattering detection (ELSD) for saponin profiling and quantification, which is also not only specific but also more sensitive in comparison to 200-210 nm detection. Some progress in development of new applications for liquid chromatography-electrospray mass spectrometry (LC/ESI/MS) for saponin determination has also been done. This method gives highest sensitivity and on line identification of separated saponins and should be recommended for specialized analyses of extracts and pharmaceutical formulas like the validation of a new assay. From non-chromatographic techniques for saponin determination, a sensitive and compound specific ELISA tests for some saponins were developed.
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Affiliation(s)
- W Oleszek
- Department of Biochemistry, Institute of Soil Science and Plant Cultivation, State Research Institute, ul. Czartoryskich 8, 24-100 Pulawy, Poland.
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Gil JH, Jung JH, Kim KJ, Kim MS, Hong J. Structural Determination of Saponins Extracted from Starfish by Fast Atom Bombardment Collision-Induced Dissociation Mass Spectrometry. ANAL SCI 2006; 22:641-4. [PMID: 16760614 DOI: 10.2116/analsci.22.641] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Three saponins were extracted and isolated from starfish by reversed-phase high performance liquid chromatography (HPLC), and analyzed by fast atom bombardment mass spectrometry (FAB-MS). Their molecular weight information could be obtained by the presence of abundant [M+Na]+ ions and weak [M+H]+ ions in FAB-MS spectra. Moreover, high resolution mass measurements of their [M+Na]+ ions were performed at the resolution of 10000 to elucidate the element composition of extracted saponins. The collision-induced dissociation (CID) of sodium-adducted molecules [M+Na]+ yielded diverse product ions via dissociated processes. In the collision-induced dissociation (CID)-MS/MS analysis of [M+Na]+ ion, the sulfate-containing saponins produced characteristic ions such as SO4Na+, [NaHSO4+Na]+, [M+Na-sugar]+ and [M+Na-2sugar]+ ions, whereas the sulfate-free compound showed characteristic ions produced by cleavage of sugar moiety and side chain of aglycone. The fragmentation patterns could provide information on the linkage position of sugar groups in aglycone and sulfate groups.
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Affiliation(s)
- Ji Hye Gil
- Hazardous Substance Research Team, Korea Basic Science Institute, Seoul, Korea
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Cao X, Tai Y, Li X, Ye Y, Pan Y. Screening for pregnane glycosides with immunological activities from the stems of Stephanotis mucronata by high-performance liquid chromatography/tandem mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2006; 20:403-11. [PMID: 16381063 DOI: 10.1002/rcm.2272] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The stems of the Chinese traditional medicine Stephanotis mucronata were screened for immunologically active pregnane glycosides using high-performance liquid chromatography (HPLC) coupled with electrospray ionization tandem mass spectrometry. In the mass spectra of pregnane glycosides, predominant [M+Na]+ ions were observed and used to determine the molecular masses, while fragmentation reactions of the [M+Na]+ ions were recorded to provide information on the primary sequences of oligosaccharide chains in terms of classes of monosaccharide. Fragment ions from the side-chain cleavage of aglycone portions can provide mass information about side-chain substitutions. To further confirm the fragment ion structures, Fourier transform ion cyclotron resonance tandem mass spectrometry (MSn) with low-energy collision-induced dissociation was performed using samples collected from HPLC fractions, which provided accurate elemental compositions of fragment ions. Based on fragmentation patterns and comparison with standards, ten pregnane glycosides were identified as stemucronatosides C, D, F, and G, mucronatosides A, B, and C, stephanoside E, and two glycosides that are identified in the S. mucronata extracts for the first time. The latter two pregnane glycosides are 12-O-cinnamoyldeacetylmetaplexigenin-3-O-6-deoxy-3-O-methyl-beta-D-allopyranosyl-(1 --> 4)-beta-D-cymaropyranosyl-(1 --> 4)-beta-D-cymaropyranoside and 12-O-cinnamoyl-20-O-acetyl (20S)-pregn-6-ene-3beta,5alpha,8beta,12beta,14beta,17beta,20-heptaol 3-O-beta-D-thevetopyranosyl-(1 --> 4)-beta-D-cymaropyranosyl-(1 --> 4)-beta-D-cymaropyranoside.
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Affiliation(s)
- Xiaoji Cao
- Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
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Li R, Zhou Y, Wu Z, Ding L. ESI-QqTOF-MS/MS and APCI-IT-MS/MS analysis of steroid saponins from the rhizomes of Dioscorea panthaica. JOURNAL OF MASS SPECTROMETRY : JMS 2006; 41:1-22. [PMID: 16402411 DOI: 10.1002/jms.988] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Using high-resolution quadrupole time-of-flight mass spectrometry along with an electrospray ionization source (ESI-QqTOF-MS), accurate molecular weights of 13 steroid saponins extracted from the rhizomes of Dioscorea panthaica were acquired and the corresponding molecular formulae obtained. In order to elucidate the fragmentation pathways of steroid saponins in D. panthaica, 10 authentic samples were investigated using ESI-QqTOF-MS/MS. In addition, atmospheric pressure chemical ionization mass spectrometry combined with ion trap tandem mass spectrometry (APCI-IT-MS/MS) was used to analyze the structures of 13 steroid saponins in D. panthaica. Through the analysis of their tandem mass data, diagnostic fragment ions of the spirostanol and furostanol steroid saponins in D. panthaica were detected as m/z 271.2056 and 253.1951. In addition, four pairs of isomers were detected and the possible structures of four unknown steroid saponins in D. panthaica speculated. ESI-TOF and APCI-MS(n) have proved to be effective tools for research on fragmentation mechanism of steroid saponins and the rapid determination of native steroid saponins in extract mixture, thereby avoiding tedious derivation and separation steps.
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Affiliation(s)
- Rui Li
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, P. R. China
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Liu S, Cui M, Liu Z, Song F, Mo W. Structural analysis of saponins from medicinal herbs using electrospray ionization tandem mass spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2004; 15:133-141. [PMID: 14766280 DOI: 10.1016/j.jasms.2003.09.013] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2003] [Revised: 08/27/2003] [Accepted: 09/16/2003] [Indexed: 05/24/2023]
Abstract
The underivatized saponins from Tribulus terrestris and Panax ginseng have been investigated by electrospray ionization multi-stage tandem mass spectrometry (ESI-MS(n)). In ESI-MS spectra, a predominant [M + Na](+) ion in positive mode and [M - H](-) ion in negative mode were observed for molecular mass information. Multi-stage tandem mass spectrometry of the molecular ions was used for detailed structural analysis. Fragment ions from glycoside cleavage can provide information on the mass of aglycone and the primary sequence and branching of oligosaccharide chains in terms of classes of monosaccharides. Fragment ions from cross-ring cleavages of sugar residues can give some information about the linkages between sugar residues. It was found that different alkali metal-cationized adducts with saponins have different degrees of fragmentation, which may originate from the different affinity of a saponin with each alkali metal in the gas phase. ESI-MS(n) has been proven to be an effective tool for rapid determination of native saponins in extract mixtures, thus avoiding tedious derivatization and separation steps.
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Affiliation(s)
- Shuying Liu
- Laboratory of Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun, China.
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Kite G, Veitch N, Grayer R, Simmonds M. The use of hyphenated techniques in comparative phytochemical studies of legumes. BIOCHEM SYST ECOL 2003. [DOI: 10.1016/s0305-1978(03)00086-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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