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Human C, Danton O, De Beer D, Maruyama T, Alexander L, Malherbe C, Hamburger M, Joubert E. Identification of a novel di-C-glycosyl dihydrochalcone and the thermal stability of polyphenols in model ready-to-drink beverage solutions with Cyclopia subternata extract as functional ingredient. Food Chem 2021; 351:129273. [PMID: 33662907 DOI: 10.1016/j.foodchem.2021.129273] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 01/29/2021] [Accepted: 01/30/2021] [Indexed: 11/15/2022]
Abstract
Heat processing of ready-to-drink beverages is required to ensure a microbiologically safe product, however, this can result in the loss of bioactive compounds responsible for functionality. The objective of this study was to establish the thermal stability of a novel dihydrochalcone, 3',5'-di-β-d-glucopyranosyl-3-hydroxyphloretin (2), 3',5'-di-β-d-glucopyranosylphloretin (3) and other Cyclopia subternata phenolic compounds, in model solutions with or without citric acid and ascorbic acid. The solutions were heated at 93, 121 and 135 °C, relevant to pasteurisation, commercial sterilisation and ultra-high temperature (UHT) pasteurisation, respectively. For most compounds, the acids decreased the second order reaction rate constants, up to 27 times. Compound 2 (46.29 ± 0.53 (g/100 g)-1 h-1), and to a lesser extent compound 3 (5.94 ± 0.01 (g/100 g)-1 h-1) were the most thermo-unstable compounds when treated at 135 °C without added acids. Even though differential effects were observed for compounds at different temperatures and formulations, overall, the phenolic compounds were most stable under UHT pasteurisation conditions.
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Affiliation(s)
- Chantelle Human
- Plant Bioactives Group, Post-Harvest and Agro-Processing Technologies, Agricultural Research Council Infruitec-Nietvoorbij, Private Bag X5026, Stellenbosch 7599, South Africa
| | - Ombeline Danton
- Pharmaceutical Biology, Pharmacenter, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Dalene De Beer
- Plant Bioactives Group, Post-Harvest and Agro-Processing Technologies, Agricultural Research Council Infruitec-Nietvoorbij, Private Bag X5026, Stellenbosch 7599, South Africa; Department of Food Science, Stellenbosch University, Private Bag X1, Matieland (Stellenbosch), 7600, South Africa
| | - Takuma Maruyama
- Plant Bioactives Group, Post-Harvest and Agro-Processing Technologies, Agricultural Research Council Infruitec-Nietvoorbij, Private Bag X5026, Stellenbosch 7599, South Africa; Department of Applied Biological Science, Tokyo University of Agriculture and Technology, Tokyo, Japan
| | - Lara Alexander
- Plant Bioactives Group, Post-Harvest and Agro-Processing Technologies, Agricultural Research Council Infruitec-Nietvoorbij, Private Bag X5026, Stellenbosch 7599, South Africa; Department of Food Science, Stellenbosch University, Private Bag X1, Matieland (Stellenbosch), 7600, South Africa
| | - Christiaan Malherbe
- Plant Bioactives Group, Post-Harvest and Agro-Processing Technologies, Agricultural Research Council Infruitec-Nietvoorbij, Private Bag X5026, Stellenbosch 7599, South Africa
| | - Matthias Hamburger
- Pharmaceutical Biology, Pharmacenter, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Elizabeth Joubert
- Plant Bioactives Group, Post-Harvest and Agro-Processing Technologies, Agricultural Research Council Infruitec-Nietvoorbij, Private Bag X5026, Stellenbosch 7599, South Africa; Department of Food Science, Stellenbosch University, Private Bag X1, Matieland (Stellenbosch), 7600, South Africa.
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Reinhardt JK, Zimmermann-Klemd AM, Danton O, Smieško M, Gründemann C, Hamburger M. Compounds from Toddalia asiatica: Immunosuppressant Activity and Absolute Configurations. JOURNAL OF NATURAL PRODUCTS 2020; 83:3012-3020. [PMID: 33001647 DOI: 10.1021/acs.jnatprod.0c00564] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In a screening of an extract library from plants used in Traditional Chinese Medicine the MeOH extract of Toddalia asiatica inhibited proliferation of human primary T cells with an IC50 of 25.8 μg/mL. Activity in the extract was tracked by HPLC activity profiling, and a total of 15 compounds were characterized. Three compounds, toddalic acid (6) and both enantiomers (7a and 7b) of toddanolic acid (7), were new natural products, and two recently published compounds, (2'R)-toddalolactone 3'-O-β-d-glucopyranoside (10) and (2'S)-toddalolactone 2'-O-β-d-glucopyranoside (11), were described in detail for the first time. The absolute configurations of compounds 8, 9, 10, 12, 13, and 15 were determined by comparison of experimental and calculated ECD spectra. For glucosides 9 and 10, ECD data and chiral-phase HPLC of the aglycones after enzymatic hydrolysis confirmed the results. Nitidine chloride (4) inhibited proliferation of primary human T cells with an IC50 of 0.4 μM.
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Affiliation(s)
- Jakob K Reinhardt
- Pharmaceutical Biology, Pharmacenter, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Amy M Zimmermann-Klemd
- Center for Complementary Medicine, Institute for Infection Prevention and Hospital Epidemiology, Faculty of Medicine, University of Freiburg, Breisacher Straße 115 B, 79106 Freiburg, Germany
| | - Ombeline Danton
- Pharmaceutical Biology, Pharmacenter, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Martin Smieško
- Pharmacenter, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Carsten Gründemann
- Pharmacenter, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Matthias Hamburger
- Pharmaceutical Biology, Pharmacenter, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
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Araújo TKD, Costa EMMDB, Maia CMDA, Alves PM, Nonaka CFW, Silva PG, Lima RDF, Godoy GP. Chemical Composition, Antibacterial and Antifungal Potential of an Extract From the Leaves of Guapira Graciliflora Mart. Against Oral Microorganisms of Dental Interest. PESQUISA BRASILEIRA EM ODONTOPEDIATRIA E CLÍNICA INTEGRADA 2020. [DOI: 10.1590/pboci.2020.075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Danton O, Alexander L, Hunlun C, de Beer D, Hamburger M, Joubert E. Bitter Taste Impact and Thermal Conversion of a Naringenin Glycoside from Cyclopia genistoides. JOURNAL OF NATURAL PRODUCTS 2018; 81:2743-2749. [PMID: 30511853 DOI: 10.1021/acs.jnatprod.8b00710] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A naringenin derivative, isolated from Cyclopia genistoides, a bitter tasting herbal tea, especially when in green (unoxidized) form, was identified as (2 S)-5-[α-l-rhamnopyranosyl-(1→2)-β-d-glucopyranosyloxy]naringenin (1). The compound partially epimerizes to (2 R)-5-[α-l-rhamnopyranosyl-(1→2)-β-d-glucopyranosyloxy]naringenin (2) when heated at different temperatures (80, 90, 100, 110, and 120 °C) for a prolonged period in a phosphate buffer at pH 5. The fractional conversion model predicted the decrease in the concentration of compound 1 the best. The activation energy of the conversion reaction was calculated as 99.16 kJ mol-1. Prolonged heating resulted not only in formation of compound 2 but eventually a decrease in its concentration and the formation of another conversion product, ( E)-2'-[α-l-rhamnopyranosyl-(1→2)-β-d-glucopyranosyloxy]-4',6',4-trihydroxychalcone (3). In contrast, naringin, glycosylated at C-7, remained stable when heated under the same conditions (100 °C for 6 h at pH 5). The bitter intensity of compound 1 was substantially less than that of naringin, both tested at 0.04 mM, a concentration typical of compound 1 in an herbal tea infusion of green C. genistoides. This comparison indicates that the position of the sugar moiety plays an important role in determining both bitter intensity and heat stability of naringenin glycosides.
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Affiliation(s)
- Ombeline Danton
- Pharmaceutical Biology, Pharmacenter , University of Basel , Klingelbergstrasse 50 , 4056 Basel , Switzerland
| | - Lara Alexander
- Plant Bioactives Group, Post-Harvest and Agro-Processing Technologies , Agricultural Research Council (ARC), Infruitec-Nietvoorbij , Private Bag X5026, Stellenbosch 7599 , South Africa
- Department of Food Science , Stellenbosch University , Private Bag X1, Matieland, Stellenbosch 7602 , South Africa
| | - Cindy Hunlun
- Plant Bioactives Group, Post-Harvest and Agro-Processing Technologies , Agricultural Research Council (ARC), Infruitec-Nietvoorbij , Private Bag X5026, Stellenbosch 7599 , South Africa
| | - Dalene de Beer
- Plant Bioactives Group, Post-Harvest and Agro-Processing Technologies , Agricultural Research Council (ARC), Infruitec-Nietvoorbij , Private Bag X5026, Stellenbosch 7599 , South Africa
- Department of Food Science , Stellenbosch University , Private Bag X1, Matieland, Stellenbosch 7602 , South Africa
| | - Matthias Hamburger
- Pharmaceutical Biology, Pharmacenter , University of Basel , Klingelbergstrasse 50 , 4056 Basel , Switzerland
| | - Elizabeth Joubert
- Plant Bioactives Group, Post-Harvest and Agro-Processing Technologies , Agricultural Research Council (ARC), Infruitec-Nietvoorbij , Private Bag X5026, Stellenbosch 7599 , South Africa
- Department of Food Science , Stellenbosch University , Private Bag X1, Matieland, Stellenbosch 7602 , South Africa
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Abstract
This review covers the isolation and structure determination of triterpenoids, including squalene derivatives, protostanes, lanostanes, holostanes, cycloartanes, dammaranes, euphanes, tirucallanes, tetranortriterpenoids, quassinoids, lupanes, oleananes, friedelanes, ursanes, hopanes, serratanes and saponins; 305 references are cited.
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Affiliation(s)
- Robert A Hill
- School of Chemistry, Glasgow University, Glasgow G12 8QQ, UK
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Lam SH, Ruan CT, Hsieh PH, Su MJ, Lee SS. Hypoglycemic diterpenoids from Tinospora crispa. JOURNAL OF NATURAL PRODUCTS 2012; 75:153-159. [PMID: 22283497 DOI: 10.1021/np200692v] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Three new diterpenoids, 2-O-lactoylborapetoside B (1), 6'-O-lactoylborapetoside B (2), and tinocrispol A (3), and nine known diterpenoids (4-12) were isolated from an EtOH extract of Tinospora crispa vines. Their structures were elucidated by spectroscopic analyses. The C-6 glucosyloxy group in borapetoside C (6) was revised to be α-oriented. The in vivo hypoglycemic activities of the major components, borapetosides A-C (4-6), were examined. Intraperitoneal injection of 4 and 6 (5 mg/kg) showed significant lowering of plasma glucose levels in normal and streptozotocin-induced type 1 diabetic mice. Borapetoside C increased glucose utilization in peripheral tissues and reduced hepatic gluconeogenesis, accounting for the hypoglycemic effect.
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Affiliation(s)
- Sio-Hong Lam
- School of Pharmacy, College of Medicine, National Taiwan University, 1 Jen-Ai Road, Taipei 10051, Taiwan, Republic of China
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Schütz C, Quitschau M, Hamburger M, Potterat O. Profiling of isoflavonoids in Iris germanica rhizome extracts by microprobe NMR and HPLC-PDA-MS analysis. Fitoterapia 2011; 82:1021-6. [PMID: 21708227 DOI: 10.1016/j.fitote.2011.06.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2011] [Revised: 06/09/2011] [Accepted: 06/11/2011] [Indexed: 10/18/2022]
Abstract
Lipophilic and polar extracts of iris rhizomes (Iris germanica) were submitted to a phytochemical profiling by a combination of HPLC-PDA-MS and semi-preparative HPLC/off-line microprobe NMR measurements. A total of 20 compounds were purified in sub-milligram to milligram amounts via two successive chromatographic steps. They were identified as isoflavones, isoflavone glycosides and acetovanillone by analysis of on-line MS and PDA, and off-line NMR data. A new isoflavone glycoside, iriflogenin-4'-O-gentiobioside, was subsequently isolated at preparative scale for full chemical characterization. This study demonstrates the applicability of the HPLC/off-line microprobe NMR approach as a robust means for rapid phytochemical profiling of plant extracts.
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Affiliation(s)
- Cornelia Schütz
- Division of Pharmaceutical Biology, University of Basel, Switzerland
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Abbet C, Neuburger M, Wagner T, Quitschau M, Hamburger M, Potterat O. Phyteumosides A and B: New Saponins with Unique Triterpenoid Aglycons from Phyteuma orbiculare L. Org Lett 2011; 13:1354-7. [DOI: 10.1021/ol200047v] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christian Abbet
- Division of Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland, Inorganic Chemistry, Department of Chemistry, Spitalstrasse 51, University of Basel, CH-4056 Basel, Switzerland, and Novartis Institutes for BioMedical Research, CH-4002 Basel, Switzerland
| | - Markus Neuburger
- Division of Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland, Inorganic Chemistry, Department of Chemistry, Spitalstrasse 51, University of Basel, CH-4056 Basel, Switzerland, and Novartis Institutes for BioMedical Research, CH-4002 Basel, Switzerland
| | - Trixie Wagner
- Division of Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland, Inorganic Chemistry, Department of Chemistry, Spitalstrasse 51, University of Basel, CH-4056 Basel, Switzerland, and Novartis Institutes for BioMedical Research, CH-4002 Basel, Switzerland
| | - Melanie Quitschau
- Division of Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland, Inorganic Chemistry, Department of Chemistry, Spitalstrasse 51, University of Basel, CH-4056 Basel, Switzerland, and Novartis Institutes for BioMedical Research, CH-4002 Basel, Switzerland
| | - Matthias Hamburger
- Division of Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland, Inorganic Chemistry, Department of Chemistry, Spitalstrasse 51, University of Basel, CH-4056 Basel, Switzerland, and Novartis Institutes for BioMedical Research, CH-4002 Basel, Switzerland
| | - Olivier Potterat
- Division of Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland, Inorganic Chemistry, Department of Chemistry, Spitalstrasse 51, University of Basel, CH-4056 Basel, Switzerland, and Novartis Institutes for BioMedical Research, CH-4002 Basel, Switzerland
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9
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Mojarrab M, Delazar A, Hamburger M, Potterat O. New Coumarin-Hemiterpene Ether Glucosides and a Structurally Related Phenylpropanoic Acid Derivative from Artemisia Armeniaca. Nat Prod Commun 2010. [DOI: 10.1177/1934578x1000501021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Two new coumarin-hemiterpene ether glucosides, 4’- O-(β-D-glucopyranosyl) desoxylacarol (1), and 5- O-(β-D-glucopyranosyl) lacarol (2), were isolated from the methanolic extract of the aerial parts of Artemisia armeniaca Lam. Their structures were established by means of spectroscopic analysis including 1H- and 2D-NMR, HRESIMS, and acid hydrolysis. In addition, a structurally related phenylpropanoic acid derivative (3) was obtained in small amounts, and its structure tentatively assigned as 3-(4-hydroxy–3-methylbutoxy)-4-methoxy melilotic acid.
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Affiliation(s)
- Mahdi Mojarrab
- Drug Applied Research Center and School of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
- Division of Pharmaceutical Biology, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland
| | - Abbas Delazar
- Biotechnology Research Center and School of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Matthias Hamburger
- Division of Pharmaceutical Biology, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland
| | - Olivier Potterat
- Division of Pharmaceutical Biology, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland
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