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Lin B, Nair S, Fellner DMJ, Nasef NA, Singh H, Negron L, Goldstone DC, Brimble MA, Gerrard JA, Domigan L, Evans JC, Stephens JM, Merry TL, Loomes KM. The Leptospermum scoparium (Mānuka)-Specific Nectar and Honey Compound 3,6,7-Trimethyllumazine (Lepteridine TM) That Inhibits Matrix Metalloproteinase 9 (MMP-9) Activity. Foods 2023; 12:4072. [PMID: 38002130 PMCID: PMC10670905 DOI: 10.3390/foods12224072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 10/30/2023] [Accepted: 11/06/2023] [Indexed: 11/26/2023] Open
Abstract
3,6,7-trimethyllumazine (Lepteridine™) is a newly discovered natural pteridine derivative unique to Mānuka (Leptospermum scoparium) nectar and honey, with no previously reported biological activity. Pteridine derivative-based medicines, such as methotrexate, are used to treat auto-immune and inflammatory diseases, and Mānuka honey reportedly possesses anti-inflammatory properties and is used topically as a wound dressing. MMP-9 is a potential candidate protein target as it is upregulated in recalcitrant wounds and intestinal inflammation. Using gelatin zymography, 40 μg/mL LepteridineTM inhibited the gelatinase activities of both pro- (22%, p < 0.0001) and activated (59%, p < 0.01) MMP-9 forms. By comparison, LepteridineTM exerted modest (~10%) inhibition against a chromogenic peptide substrate and no effect against a fluorogenic peptide substrate. These findings suggest that LepteridineTM may not interact within the catalytic domain of MMP-9 and exerts a negligible effect on the active site hydrolysis of small soluble peptide substrates. Instead, the findings implicate fibronectin II domain interactions by LepteridineTM which impair gelatinase activity, possibly through perturbed tethering of MMP-9 to the gelatin matrix. Molecular modelling analyses were equivocal over interactions at the S1' pocket versus the fibronectin II domain, while molecular dynamic calculations indicated rapid exchange kinetics. No significant degradation of synthetic or natural LepteridineTM in Mānuka honey occurred during simulated gastrointestinal digestion. MMP-9 regulates skin and gastrointestinal inflammatory responses and extracellular matrix remodelling. These results potentially implicate LepteridineTM bioactivity in Mānuka honey's reported beneficial effects on wound healing via topical application and anti-inflammatory actions in gastrointestinal disorder models via oral consumption.
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Affiliation(s)
- Bin Lin
- School of Biological Sciences and Institute for Innovation in Biotechnology, The University of Auckland, Auckland 1142, New Zealand; (B.L.); (S.N.); (D.C.G.); (M.A.B.); (J.A.G.)
| | - Smitha Nair
- School of Biological Sciences and Institute for Innovation in Biotechnology, The University of Auckland, Auckland 1142, New Zealand; (B.L.); (S.N.); (D.C.G.); (M.A.B.); (J.A.G.)
| | - Daniel M. J. Fellner
- School of Chemical Sciences, The University of Auckland, Auckland 1142, New Zealand;
| | - Noha Ahmed Nasef
- Riddet Institute, Massey University, Palmerston North 4410, New Zealand; (N.A.N.); (H.S.)
| | - Harjinder Singh
- Riddet Institute, Massey University, Palmerston North 4410, New Zealand; (N.A.N.); (H.S.)
| | - Leonardo Negron
- Callaghan Innovation, Gracefield Innovation Quarter, 69 Gracefield Road, Lower Hutt 5010, New Zealand;
| | - David C. Goldstone
- School of Biological Sciences and Institute for Innovation in Biotechnology, The University of Auckland, Auckland 1142, New Zealand; (B.L.); (S.N.); (D.C.G.); (M.A.B.); (J.A.G.)
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Auckland 1142, New Zealand;
| | - Margaret A. Brimble
- School of Biological Sciences and Institute for Innovation in Biotechnology, The University of Auckland, Auckland 1142, New Zealand; (B.L.); (S.N.); (D.C.G.); (M.A.B.); (J.A.G.)
- School of Chemical Sciences, The University of Auckland, Auckland 1142, New Zealand;
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Auckland 1142, New Zealand;
| | - Juliet A. Gerrard
- School of Biological Sciences and Institute for Innovation in Biotechnology, The University of Auckland, Auckland 1142, New Zealand; (B.L.); (S.N.); (D.C.G.); (M.A.B.); (J.A.G.)
- School of Chemical Sciences, The University of Auckland, Auckland 1142, New Zealand;
| | - Laura Domigan
- Department of Chemical and Materials Engineering, The University of Auckland, Auckland 1142, New Zealand;
| | - Jackie C. Evans
- Comvita NZ Limited, 23 Wilson Road South, Bay of Plenty, Paengaroa 3189, New Zealand; (J.C.E.); (J.M.S.)
| | - Jonathan M. Stephens
- Comvita NZ Limited, 23 Wilson Road South, Bay of Plenty, Paengaroa 3189, New Zealand; (J.C.E.); (J.M.S.)
| | - Troy L. Merry
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Auckland 1142, New Zealand;
- Comvita NZ Limited, 23 Wilson Road South, Bay of Plenty, Paengaroa 3189, New Zealand; (J.C.E.); (J.M.S.)
- Discipline of Nutrition, School of Medical Sciences, The University of Auckland, Auckland 1142, New Zealand
| | - Kerry M. Loomes
- School of Biological Sciences and Institute for Innovation in Biotechnology, The University of Auckland, Auckland 1142, New Zealand; (B.L.); (S.N.); (D.C.G.); (M.A.B.); (J.A.G.)
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Auckland 1142, New Zealand;
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Shimakage R, Nihei KI. Synthesis, structural revision, and tyrosinase inhibitory activity of proposed phloretin-4-O-β-D-glucopyranoside from Homalium stenophyllum. Nat Prod Res 2020; 36:1803-1811. [PMID: 32924592 DOI: 10.1080/14786419.2020.1817922] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Phloretin-4-O-β-D-glucopyranoside (1), isolated from Homalium stenophyllum, was synthesized for the first time through aldol condensation and Schmidt glycosylation reactions aiming to develop a novel hydrophilic tyrosinase inhibitor. However, the specific rotation of synthetic 1 was found to be negative and different from that reported for natural product 1. Thus, L-glucoside 2 was chemically synthesized using the established synthetic route of 1, suggesting that the configuration of the natural product 1 was the same as that of 2, as their specific rotation and spectroscopic data were also the same. In addition, the evaluation of the inhibitory activity of 1 and 2 against tyrosinase indicated that 2 was 1.4 times more potent than 1, but they were both relatively weak. Therefore, the enantiomeric analogues 1 and 2 were proved to be unique tyrosinase inhibitors due to the chiral recognition from the tyrosinase active site.
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Affiliation(s)
- Ryo Shimakage
- Department of Applied Biological Chemistry, School of Agriculture, Utsunomiya University, Tochigi, Japan
| | - Ken-Ichi Nihei
- Department of Applied Biological Chemistry, School of Agriculture, Utsunomiya University, Tochigi, Japan
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3
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Kato Y, Kishi Y, Okano Y, Kawai M, Shimizu M, Suga N, Yakemoto C, Kato M, Nagata A, Miyoshi N. Methylglyoxal binds to amines in honey matrix and 2'-methoxyacetophenone is released in gaseous form into the headspace on the heating of manuka honey. Food Chem 2020; 337:127789. [PMID: 32795863 DOI: 10.1016/j.foodchem.2020.127789] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 07/31/2020] [Accepted: 08/04/2020] [Indexed: 10/23/2022]
Abstract
Reports on the thermal stability of manuka honey in terms of food processing have been few. This study investigated changes in nine characteristic chemicals of manuka honey during heating. Among these, methylglyoxal (MGO) and 2'-methoxyacetophenone (MAP) were significantly decreased by heating at 90 °C. To elucidate the mechanism for this decrease, artificial honey was prepared from sugars and water with MAP or MGO and then heated. The decrease of MGO was enhanced with l-proline, lysine, or arginine derivatives, accompanied by formation of 2-acetyl-1-pyrroline, MGO-derived lysine dimer, or argpyrimidine, respectively, suggesting that an amino-carbonyl reaction is one pathway for the loss of MGO. The decrease of MAP in the artificial honey depended on the volume of headspace in a vessel. MAP from heated manuka honey was also detected in the gas phase, indicating that MAP was vaporized. Heating could thus reduce the beneficial and/or signature molecules in honey.
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Affiliation(s)
- Yoji Kato
- School of Human Science and Environment, University of Hyogo, Himeji, Hyogo 670-0092, Japan; Research Institute for Food and Nutritional Sciences, University of Hyogo, Himeji, Hyogo 670-0092, Japan.
| | - Yui Kishi
- School of Human Science and Environment, University of Hyogo, Himeji, Hyogo 670-0092, Japan
| | - Yayako Okano
- School of Human Science and Environment, University of Hyogo, Himeji, Hyogo 670-0092, Japan
| | - Masaki Kawai
- School of Human Science and Environment, University of Hyogo, Himeji, Hyogo 670-0092, Japan
| | - Michiyo Shimizu
- School of Human Science and Environment, University of Hyogo, Himeji, Hyogo 670-0092, Japan
| | - Naoko Suga
- School of Human Science and Environment, University of Hyogo, Himeji, Hyogo 670-0092, Japan
| | - Chisato Yakemoto
- School of Human Science and Environment, University of Hyogo, Himeji, Hyogo 670-0092, Japan
| | - Mai Kato
- School of Food and Nutritional Sciences, University of Shizuoka, Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Akika Nagata
- School of Food and Nutritional Sciences, University of Shizuoka, Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Noriyuki Miyoshi
- School of Food and Nutritional Sciences, University of Shizuoka, Yada, Suruga-ku, Shizuoka 422-8526, Japan
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4
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Kato Y, Kawai M, Kawai S, Okano Y, Rokkaku N, Ishisaka A, Murota K, Nakamura T, Nakamura Y, Ikushiro S. Dynamics of the Cellular Metabolism of Leptosperin Found in Manuka Honey. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:10853-10862. [PMID: 31496237 DOI: 10.1021/acs.jafc.9b03894] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Leptosperin (methyl syringate β-d-gentiobioside) is abundantly found in manuka honey, which is widely used because of its antibacterial and possible anti-inflammatory activities. The aim of this study was to examine the molecular mechanism underlying the metabolism of leptosperin. Five phytochemicals (leptosperin, methyl syringate (MSYR), glucuronate conjugate of MSYR (MSYR-GA), sulfonate conjugate of MSYR (MSYR-S), and syringic acid (SYR)) were separately incubated with HepG2 and Caco-2 cells. After incubation, we found that the concentration of MSYR decreased, whereas the concentrations of SYR, MSYR-GA, and MSYR-S increased. By profiling with inhibitors and carboxylesterases (CES1, 2), we found that the conversion from MSYR to SYR was mediated by CES1. Lipopolysaccharide-stimulated RAW264.7 cells restored MSYR-GA to MSYR possibly by the secreted β-glucuronidase. All of the mice administered with leptosperin, MSYR, or manuka honey showed higher MSYR (13.84 ± 11.51, 14.29 ± 9.19, or 6.66 ± 2.30 nM) and SYR (1.85 ± 0.66, 6.01 ± 1.20, or 8.16 ± 3.10 nM) levels in the plasma compared with that of the vehicle controls (3.33 ± 1.45 (MSYR) and 1.85 ± 0.66 (SYR) nM). The findings of our study indicate that the unique metabolic pathways of these compounds may account for possible functionalities of manuka honey.
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Affiliation(s)
| | | | | | | | | | | | - Kaeko Murota
- Faculty of Life and Environmental Science , Shimane University , Matsue , Shimane 690-8504 , Japan
| | - Toshiyuki Nakamura
- Graduate School of Environmental and Life Science , Okayama University , Okayama 700-0082 , Japan
| | - Yoshimasa Nakamura
- Graduate School of Environmental and Life Science , Okayama University , Okayama 700-0082 , Japan
| | - Shinichi Ikushiro
- Department of Biotechnology , Toyama Prefectural University , Imizu , Toyama 939-0398 , Japan
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Arai MA, Yamaguchi Y, Ishibashi M. Total synthesis of agalloside, isolated from Aquilaria agallocha, by the 5-O-glycosylation of flavan. Org Biomol Chem 2018; 15:5025-5032. [PMID: 28569322 DOI: 10.1039/c7ob01004d] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Agalloside (1) is a neural stem cell differentiation activator isolated from Aquilaria agallocha by our group using Hes1 immobilized beads. We conducted the first total synthesis of agalloside (1) via the 5-O-glycosylation of flavan 25 using glycosyl fluoride 20 in the presence of BF3·Et2O. Subsequent oxidation with DDQ to flavanone 2 and deprotection successively provided agalloside (1). This synthetic strategy holds promise for use in the synthesis of 5-O-glycosylated flavonoids. The synthesized agalloside (1) accelerated neural stem cell differentiation, which is a result comparable to that for the naturally occurring compound 1.
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Affiliation(s)
- Midori A Arai
- Department of Natural Product Chemistry, Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba, 260-8675, Japan.
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6
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Burns DT, Dillon A, Warren J, Walker MJ. A Critical Review of the Factors Available for the Identification and Determination of Mānuka Honey. FOOD ANAL METHOD 2018. [DOI: 10.1007/s12161-018-1154-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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8
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Bong J, Loomes KM, Lin B, Stephens JM. New approach: Chemical and fluorescence profiling of NZ honeys. Food Chem 2017; 267:355-367. [PMID: 29934178 DOI: 10.1016/j.foodchem.2017.07.065] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 07/12/2017] [Accepted: 07/12/2017] [Indexed: 12/19/2022]
Abstract
New Zealand manuka (Leptospermum scoparium) and kanuka (Kunzea ericoides) honeys contain a unique array of chemical markers useful for chemical fingerprinting. We investigated the presence of 13 potential marker compounds in nectars of the major honey crop species. We confirmed that leptosperin, lepteridine, 2'-methoxyacetophenone, and 2-methoxybenzoic acid are exclusive to manuka nectar whereas lumichrome is unique to kanuka nectar. 3-Phenyllactic acid and 4-hydroxyphenyllactic acid are present in manuka and kanuka nectars. Leptosperin, lepteridine, 3-phenyllactic acid, and 4-hydroxyphenyllactic acid are chemically stable over prolonged storage, but not 2-methoxybenzoic acid and 2'-methoxyacetophenone. Accordingly, leptosperin and lepteridine are definitive chemical markers for authentication of manuka honey. An optimal concentration cut-off was established for the floral source-specific markers: leptosperin (94mg/kg), lepteridine (2.1mg/kg), 2'-methoxyacetophenone (2.0mg/kg) for manuka honey, and lumichrome (4.5mg/kg) for kanuka honey. The use of leptosperin and lepteridine as fluorescence markers for manuka honey authentication is reinforced.
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Affiliation(s)
- Jessie Bong
- School of Biological Sciences and Institute for Innovation in Biotechnology, University of Auckland, PB92019 Auckland, New Zealand
| | - Kerry M Loomes
- School of Biological Sciences and Institute for Innovation in Biotechnology, University of Auckland, PB92019 Auckland, New Zealand; Maurice Wilkins Centre for Molecular Biodiscovery, PB92019 Auckland, New Zealand
| | - Bin Lin
- School of Biological Sciences and Institute for Innovation in Biotechnology, University of Auckland, PB92019 Auckland, New Zealand
| | - Jonathan M Stephens
- School of Biological Sciences and Institute for Innovation in Biotechnology, University of Auckland, PB92019 Auckland, New Zealand; Comvita NZ Limited, Wilson South Road, Paengaroa, PB1, Te Puke, New Zealand.
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9
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Ishisaka A, Ikushiro S, Takeuchi M, Araki Y, Juri M, Yoshiki Y, Kawai Y, Niwa T, Kitamoto N, Sakaki T, Ishikawa H, Kato Y. In vivo absorption and metabolism of leptosperin and methyl syringate, abundantly present in manuka honey. Mol Nutr Food Res 2017; 61. [DOI: 10.1002/mnfr.201700122] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Revised: 03/31/2017] [Accepted: 04/10/2017] [Indexed: 11/05/2022]
Affiliation(s)
- Akari Ishisaka
- School of Human Science and Environment; University of Hyogo; Himeji Hyogo Japan
- Research Institute for Food and Nutritional Sciences; University of Hyogo; Himeji Hyogo Japan
| | - Shinichi Ikushiro
- Department of Biotechnology; Toyama Prefectural University; Imizu Toyama Japan
| | - Mie Takeuchi
- School of Human Science and Environment; University of Hyogo; Himeji Hyogo Japan
| | - Yukako Araki
- School of Human Science and Environment; University of Hyogo; Himeji Hyogo Japan
| | - Maki Juri
- School of Human Science and Environment; University of Hyogo; Himeji Hyogo Japan
| | - Yui Yoshiki
- School of Human Science and Environment; University of Hyogo; Himeji Hyogo Japan
| | - Yoshichika Kawai
- Department of Food Science; Graduate School of Biomedical Sciences; Tokushima University; Tokushima Tokushima Japan
| | - Toshio Niwa
- Faculty of Health and Nutrition; Shubun University; Ichinomiya Aichi Japan
| | - Noritoshi Kitamoto
- School of Human Science and Environment; University of Hyogo; Himeji Hyogo Japan
- Research Institute for Food and Nutritional Sciences; University of Hyogo; Himeji Hyogo Japan
| | - Toshiyuki Sakaki
- Department of Biotechnology; Toyama Prefectural University; Imizu Toyama Japan
| | | | - Yoji Kato
- School of Human Science and Environment; University of Hyogo; Himeji Hyogo Japan
- Research Institute for Food and Nutritional Sciences; University of Hyogo; Himeji Hyogo Japan
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10
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Leptosperin is a distinct and detectable fluorophore in Leptospermum honeys. Food Chem 2017; 214:102-109. [DOI: 10.1016/j.foodchem.2016.07.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 05/02/2016] [Accepted: 07/04/2016] [Indexed: 11/20/2022]
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11
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Daniels BJ, Prijic G, Meidinger S, Loomes KM, Stephens JM, Schlothauer RC, Furkert DP, Brimble MA. Isolation, Structural Elucidation, and Synthesis of Lepteridine From Ma̅nuka (Leptospermum scoparium) Honey. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:5079-5084. [PMID: 27210444 DOI: 10.1021/acs.jafc.6b01596] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Ma̅nuka honey, made from the nectar of Leptospermum scoparium, has garnered scientific and economical interest due to its nonperoxide antibacterial activity. Biomarkers for genuine ma̅nuka honey are increasingly in demand due to the presence of counterfeit ma̅nuka honey. This work reports the identification of a compound previously unreported in ma̅nuka honey by HPLC, and determination of the structure of the as 3,6,7-trimethyllumazine using NMR, MS, IR, and UV/vis spectroscopy. This assignment was confirmed by total synthesis. The natural product, renamed lepteridine, was only observed in ma̅nuka honeys and could potentially serve as a biomarker for genuine ma̅nuka honey.
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Affiliation(s)
- Benjamin J Daniels
- School of Chemical Sciences, The University of Auckland , 23 Symonds Street, Auckland 1010, New Zealand
| | - Gordana Prijic
- Comvita NZ Limited , 23 Wilson South Road, Te Puke 3189, New Zealand
- School of Biological Sciences and Institute for Innovation in Biotechnology, The University of Auckland , 3A Symonds Street, Auckland 1010, New Zealand
| | - Sarah Meidinger
- School of Biological Sciences and Institute for Innovation in Biotechnology, The University of Auckland , 3A Symonds Street, Auckland 1010, New Zealand
| | - Kerry M Loomes
- School of Biological Sciences and Institute for Innovation in Biotechnology, The University of Auckland , 3A Symonds Street, Auckland 1010, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland , 3 Symonds Street, Auckland 1010, New Zealand
| | - Jonathan M Stephens
- Comvita NZ Limited , 23 Wilson South Road, Te Puke 3189, New Zealand
- School of Biological Sciences and Institute for Innovation in Biotechnology, The University of Auckland , 3A Symonds Street, Auckland 1010, New Zealand
| | | | - Daniel P Furkert
- School of Chemical Sciences, The University of Auckland , 23 Symonds Street, Auckland 1010, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland , 3 Symonds Street, Auckland 1010, New Zealand
| | - Margaret A Brimble
- School of Chemical Sciences, The University of Auckland , 23 Symonds Street, Auckland 1010, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland , 3 Symonds Street, Auckland 1010, New Zealand
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12
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Competitive immunochromatographic assay for leptosperin as a plausible authentication marker of manuka honey. Food Chem 2016; 194:362-5. [DOI: 10.1016/j.foodchem.2015.08.040] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Revised: 07/18/2015] [Accepted: 08/11/2015] [Indexed: 11/22/2022]
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13
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Davydova AN, Sharipov BT, Valeev FA. Eleuthesides and their analogs: IX. Synthesis of C3–C8 eleutheside block from levoglucosenone. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2015. [DOI: 10.1134/s1070428015100097] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Marzag H, Robert G, Dufies M, Bougrin K, Auberger P, Benhida R. FeCl3-promoted and ultrasound-assisted synthesis of resveratrol O-derived glycoside analogs. ULTRASONICS SONOCHEMISTRY 2015; 22:15-21. [PMID: 24961448 DOI: 10.1016/j.ultsonch.2014.05.022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Revised: 05/23/2014] [Accepted: 05/26/2014] [Indexed: 06/03/2023]
Abstract
Phenol derived O-glycosides were synthesized using a direct and convenient O-glycosidation, starting from acetylated sugars in the presence of FeCl3, an inexpensive, mild and benign Lewis acid catalyst. The reactions were carried out under both conventional and ultrasonic irradiation conditions. In general, improvement in rates and yields were observed when reactions were carried out under sonication compared with conventional conditions leading to the corresponding β-O-glycosides as the major anomer. Post-synthetic transformations of iodophenol intermediates led to new resveratrol O-glycoside analogs in good overall yields.
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Affiliation(s)
- Hamid Marzag
- Institut de Chimie de Nice UMR CNRS 7272, Université Nice-Sophia Antipolis, Parc Valrose, 06108 Nice Cedex 2, France; Laboratoire de Chimie des Plantes et de Synthèse Organique et Bioorganique, URAC23, Université Mohammed V-Agdal, Faculté des Sciences, B.P. 1014 Rabat, Morocco
| | - Guillaume Robert
- Centre Méditérranéen de Médecine Moléculaire UMR INSERM U1065, Equipe 2 Cell Death Differentiation and Cancer, Equipe Labellisée par la Ligue Nationale contre le Cancer, Université de Nice-Sophia Antipolis, C3M - Bâtiment ARCHIMED 151 route Saint Antoine de Ginestière, 06204 Nice, France
| | - Maeva Dufies
- Centre Méditérranéen de Médecine Moléculaire UMR INSERM U1065, Equipe 2 Cell Death Differentiation and Cancer, Equipe Labellisée par la Ligue Nationale contre le Cancer, Université de Nice-Sophia Antipolis, C3M - Bâtiment ARCHIMED 151 route Saint Antoine de Ginestière, 06204 Nice, France
| | - Khalid Bougrin
- Laboratoire de Chimie des Plantes et de Synthèse Organique et Bioorganique, URAC23, Université Mohammed V-Agdal, Faculté des Sciences, B.P. 1014 Rabat, Morocco
| | - Patrick Auberger
- Centre Méditérranéen de Médecine Moléculaire UMR INSERM U1065, Equipe 2 Cell Death Differentiation and Cancer, Equipe Labellisée par la Ligue Nationale contre le Cancer, Université de Nice-Sophia Antipolis, C3M - Bâtiment ARCHIMED 151 route Saint Antoine de Ginestière, 06204 Nice, France
| | - Rachid Benhida
- Institut de Chimie de Nice UMR CNRS 7272, Université Nice-Sophia Antipolis, Parc Valrose, 06108 Nice Cedex 2, France.
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Kato Y, Fujinaka R, Ishisaka A, Nitta Y, Kitamoto N, Takimoto Y. Plausible authentication of manuka honey and related products by measuring leptosperin with methyl syringate. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:6400-6407. [PMID: 24941263 DOI: 10.1021/jf501475h] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Manuka honey, obtained from Leptospermum scoparium flowers in New Zealand, has strong antibacterial properties. In this study, plausible authentication of the manuka honey was inspected by measuring leptosperin, methyl syringate 4-O-β-D-gentiobiose, along with methyl syringate. Despite a gradual decrease in methyl syringate content over 30 days at 50 °C, even at moderate 37 °C, leptosperin remained stable. A considerable correlation between nonperoxide antibacterial activity and leptosperin content was observed in 20 certified manuka honey samples. Leptosperin and methyl syringate in manuka honey and related products were analyzed using HPLC connected with mass spectrometry. One noncertified brand displayed significant variations in the leptosperin and methyl syringate contents between two samples obtained from different regions. Therefore, certification is clearly required to protect consumers from disguised and/or low-quality honey. Because leptosperin is stable during storage and specific to manuka honey, its measurement may be applicable for manuka honey authentication.
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Affiliation(s)
- Yoji Kato
- School of Human Science and Environment, and ‡Research Institute for Food and Nutritional Sciences, University of Hyogo , Hyogo, Japan
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