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Zhou M, Li T, Zeng C, Pan DB, Li HB, Yu Y. Two new diterpenoids from the rhizomes of Zingiber officinale. Nat Prod Res 2023; 37:2255-2262. [PMID: 35184622 DOI: 10.1080/14786419.2022.2038595] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 12/30/2021] [Accepted: 01/27/2022] [Indexed: 10/19/2022]
Abstract
Two undescribed labdane diterpenoids (5S,8S,9R,10S,11E)-8,17-epoxy-13,14-dinorlabd-11-en-13-one (1) and (5S,9R,10S,12E)-17-hydroxy-labd-7,12-dien-15(16)-olide (2), together with seven known sesquiterpenoids (3-9) and two known monoterpenoids (10-11) were isolated from the dried rhizome of Zingiber officinale. Their structures were elucidated by detailed spectroscopic data (IR, UV, HR-ESI-MS, 1D and 2D NMR), X-ray crystallographic and ECD analysis. Moreover, all the 11 compounds were tested for α-glucosidase inhibitory effects and 9 was found to exhibit stronger inhibitory effects at IC50 = 4.8 μM against a positive control acarbose with IC50 = 414.6 μM.
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Affiliation(s)
- Mi Zhou
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drug Research, Jinan University, Guangzhou, China
| | - Ting Li
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drug Research, Jinan University, Guangzhou, China
| | - Chen Zeng
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drug Research, Jinan University, Guangzhou, China
| | - Da-Bo Pan
- Department of Medical Technology, Qiandongnan Vocational & Technical College for Nationalities, Kaili, Guizhou, P.R. China
| | - Hai-Bo Li
- State Key Laboratory of New-tech for Chinese Medicine Pharmaceutical Process, Kanion Pharmaceutical Co. Ltd., Lianyungang, China
| | - Yang Yu
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drug Research, Jinan University, Guangzhou, China
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2
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Gach J, Grzelczyk J, Strzała T, Boratyński F, Olejniczak T. Microbial Metabolites of 3- n-butylphthalide as Monoamine Oxidase A Inhibitors. Int J Mol Sci 2023; 24:10605. [PMID: 37445788 DOI: 10.3390/ijms241310605] [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: 05/24/2023] [Revised: 06/21/2023] [Accepted: 06/22/2023] [Indexed: 07/15/2023] Open
Abstract
Novel compounds with antidepressant activity via monoamine oxidase inhibition are being sought. Among these, derivatives of 3-n-butylphthalide, a neuroprotective lactone from Apiaceae plants, may be prominent candidates. This study aimed to obtain the oxidation products of 3-n-butylphthalide and screen them regarding their activity against the monoamine oxidase A (MAO-A) isoform. Such activity of these compounds has not been previously tested. To obtain the metabolites, we used fungi as biocatalysts because of their high oxidative capacity. Overall, 37 strains were used, among which Penicillium and Botrytis spp. were the most efficient, leading to the obtaining of three main products: 3-n-butyl-10-hydroxyphthalide, 3-n-butylphthalide-11-oic acid, and 3-n-butyl-11-hydroxyphthalide, with a total yield of 0.38-0.82 g per g of the substrate, depending on the biocatalyst used. The precursor-3-n-butylphthalide and abovementioned metabolites inhibited the MAO-A enzyme; the most active was the carboxylic acid derivative of the lactone with inhibitory constant (Ki) < 0.001 µmol/L. The in silico prediction of the drug-likeness of the metabolites matches the assumptions of Lipinski, Ghose, Veber, Egan, and Muegge. All the compounds are within the optimal range for the lipophilicity value, which is connected to adequate permeability and solubility.
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Affiliation(s)
- Joanna Gach
- Department of Food Chemistry and Biocatalysis, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland
| | - Joanna Grzelczyk
- Institute of Food Technology and Analysis, Faculty of Biotechnology and Food Sciences, Lodz University of Technology, Stefanowskiego 2/22, 90-924 Łódź, Poland
| | - Tomasz Strzała
- Department of Genetics, Wrocław University of Environmental and Life Sciences, Kożuchowska 7, 51-631 Wrocław, Poland
| | - Filip Boratyński
- Department of Food Chemistry and Biocatalysis, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland
| | - Teresa Olejniczak
- Department of Food Chemistry and Biocatalysis, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland
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Whaley AO, Ivkin DY, Zhaparkulova KA, Olusheva IN, Serebryakov EB, Smirnov SN, Semivelichenko ED, Grishina AY, Karpov AA, Eletckaya EI, Kozhanova KK, Ibragimova LN, Tastambek KT, Seitaliyeva AM, Terninko II, Sakipova ZB, Shikov AN, Povydysh MN, Whaley AK. Chemical composition and cardiotropic activity of Ziziphora clinopodioides subsp. bungeana (Juz.) Rech.f. JOURNAL OF ETHNOPHARMACOLOGY 2023:116660. [PMID: 37253397 DOI: 10.1016/j.jep.2023.116660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 05/13/2023] [Accepted: 05/17/2023] [Indexed: 06/01/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Ziziphora clinopodioides subsp. bungeana (Juz.) Rech.f. is a subshrub that is widely distributed in China, Kazakhstan, Kyrgyzstan, Mongolia, Russia, Tajikistan, Turkmenistan, and Uzbekistan. The species is used in traditional medicine for the relief of symptoms connected to cardiovascular diseases like coronary heart disease or hypertension. AIM OF THE STUDY was to validate traditional use of Z. clinopodioides subsp. bungeana for the treatment of coronary hearth diseases using in vivo models and to find active compounds responsible for the activity. MATERIALS AND METHODS Multiple extracts were obtained from the aerial parts of Z. clinopodioides subsp. bungeana using maceration, liquid-liquid extraction, CO2 extraction and ultrasound-assisted extraction. Preliminary screening studies for the evaluation of the efficacy of Z. clinopodioides subsp. bungeana extracts on the model of hemic hypoxia were performed. The most effective samples were selected and included in the main study. Stage 2 of the study evaluated the cardiotropic activity of the selected extracts on a model of chronic heart failure. Preparations were administered to animals intragastrically once a day for 28 days. For the isolation of individual compounds plant material was extracted with 96% ethanol. The obtained crude extract was sequentially extracted with n-hexane and dichloromethane and separated by chromatography on a Diaion HP-20 column. The obtained fractions were further subjected to Sephadex LH-20 column chromatography and eluted isocratically with 96% ethanol (EtOH) to yield subfractions, which were further separated by preparative HPLC to obtain 13 individual compounds. RESULTS Extracts obtained from Ziziphora clinopodioides subsp. bungeana (Juz.) Rech.f. herb were subjected to pharmacological screening for the evaluation of their efficacy on hemic hypoxia. Based on the obtained results, out of the sixteen tested extracts two (AR and US 60%) were selected for further evaluation of their cardiotropic activity. Modeling of chronic heart failure was carried out in accordance with the following stages: 1) anesthesia with chloral hydrate at a dose of 450 mg/kg, intraperitoneally, 2) artificial ventilation of the lungs, 3) thoracotomy, 4) modeling of permanent ischemic or ischemic-reperfusion damage. Both extracts effected the indicators of contraction and output, comparable to the reference drug - Monopril. Based on the extraction methods used to obtain RAF and US60 and data from the literature, it can be assumed that they contain compounds with medium polarity, including polyphenols and terpenoids. At the next stage three previously undescribed monoterpenoid derivatives - Ziziphoric acid (1), Ziziphoroside D (2) and 6'-malonylziziphoroside A (3), along with two previously described megastigmane glucosides - blumenol C glucoside (4), blumenol C 9-O-(6'-O-malonyl-beta-D-glucopyranoside (5) and two previously described monoterpenoids 7a-hydroxymintlactone (6), 7-hydroxypiperitone (7) together with six polyphenols - pinocembrine-7-O-rutinoside (8), chrysine-7-O-rutinoside (9), acacetin-7-O-rutinoside (10), luteolin-7-O-rutinoside (11), rutin (12) and rosmarinic acid (13) were isolated from Z. clinopodioides subsp. bungeana extracts. CONCLUSION Our results support the traditional use of Z. clinopodioides subsp. bungeana for the treatment of coronary diseases. As a result of Z. clinopodioides subsp. bungeana extracts screening in vivo, two extracts were selected as potential cardiotropic agents. Phytochemical analysis of the plant material led to the isolation of five terpenoid derivatives, two megastigmane glycosides, five flavonoids and one cinnamic acid derivative, which could be responsible for the reported biological activity. Future experiments are required to understand the mechanisms of action for the isolated compounds.
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Affiliation(s)
- A O Whaley
- Saint Petersburg State Chemical Pharmaceutical University, Saint Petersburg, Department of Pharmacognosy, Russia
| | - D Y Ivkin
- Saint Petersburg State Chemical Pharmaceutical University, Saint Petersburg, Department of Pharmacology and Clinical Pharmacology, Russia
| | - K A Zhaparkulova
- School of Pharmacy, S.D. Asfendiyarov Kazakh National Medical University, Tole-bi 94, 050012, Almaty, Kazakhstan
| | - I N Olusheva
- Saint Petersburg State Chemical Pharmaceutical University, Saint Petersburg, Department of Pharmacognosy, Russia
| | - E B Serebryakov
- Saint Petersburg State University, Universitetskii pr. 26, St. Petersburg, 198504, Russia
| | - S N Smirnov
- Saint Petersburg State University, Universitetskii pr. 26, St. Petersburg, 198504, Russia
| | - E D Semivelichenko
- Saint Petersburg State Chemical Pharmaceutical University, Saint Petersburg, Department of Pharmacology and Clinical Pharmacology, Russia
| | - A Yu Grishina
- Saint Petersburg State Chemical Pharmaceutical University, Saint Petersburg, Department of Pharmacology and Clinical Pharmacology, Russia
| | - A A Karpov
- Saint Petersburg State Chemical Pharmaceutical University, Saint Petersburg, Department of Pharmacology and Clinical Pharmacology, Russia
| | - E I Eletckaya
- Saint Petersburg State Chemical Pharmaceutical University, Saint Petersburg, Department of Pharmacology and Clinical Pharmacology, Russia
| | - K K Kozhanova
- School of Pharmacy, S.D. Asfendiyarov Kazakh National Medical University, Tole-bi 94, 050012, Almaty, Kazakhstan
| | - L N Ibragimova
- School of Pharmacy, S.D. Asfendiyarov Kazakh National Medical University, Tole-bi 94, 050012, Almaty, Kazakhstan
| | - K T Tastambek
- School of Pharmacy, S.D. Asfendiyarov Kazakh National Medical University, Tole-bi 94, 050012, Almaty, Kazakhstan; Ecology Research Institute, Khoja Akhmet Yassawi International Kazakh-Turkish University, Turkistan, 161200, Kazakhstan; Department of Biotechnology, M. Auezov South Kazakhstan University, Shymkent, 160012, Kazakhstan
| | - A M Seitaliyeva
- Higher School of Medicine, Al-Farabi Kazakh National University, Tole-bi 96, 050012, Almaty, Kazakhstan
| | - I I Terninko
- Saint Petersburg State Chemical Pharmaceutical University, Saint Petersburg, Center for Quality Control of Medicines, Russia
| | - Z B Sakipova
- School of Pharmacy, S.D. Asfendiyarov Kazakh National Medical University, Tole-bi 94, 050012, Almaty, Kazakhstan
| | - A N Shikov
- Saint Petersburg State Chemical Pharmaceutical University, Saint Petersburg, Department of Pharmacognosy, Russia
| | - M N Povydysh
- Saint Petersburg State Chemical Pharmaceutical University, Saint Petersburg, Department of Pharmacognosy, Russia.
| | - A K Whaley
- Saint Petersburg State Chemical Pharmaceutical University, Saint Petersburg, Department of Pharmacognosy, Russia
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Chemical constituents from the stems and leaves of Amomum villosum Lour. and their anti-inflammatory and antioxidant activities. Bioorg Chem 2023; 131:106281. [PMID: 36434951 DOI: 10.1016/j.bioorg.2022.106281] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 11/13/2022] [Accepted: 11/14/2022] [Indexed: 11/21/2022]
Abstract
Amomum villosum Lour. is a medicinal and edible plant, whose medicinal parts are dried and mature fruits, and its stems and leaves are always treated as waste. HPLC-MS/MS analysis showed that the chemical components contained in the stems/leaves of A. villosum and those in fruits are quite different. To discover potential active ingredients from the stems/leaves of A. villosum, phytochemical evaluation of the stems/leaves of A. villosum was conducted to isolate and identify-four undescribed compounds (1, 2a, 2b, and 3) along with 41 known ones (4a, 4b, 5a, 5b, and 6-42). All isolated compounds were assessed for their anti-inflammatory and antioxidant activities. Among them, compounds 5b, 33, 34, and 38 exhibited anti-inflammatory activity, and compounds 1, 4a, 4b, 6, 7, 15, 33, 35, 37, and 41 showed antioxidant effects. Among them, the new compound 1 showed a significant antioxidant effect via activation of NRF2/HO-1 pathways. Therefore, the leaves and stems of A. villosum may be served as a potential medicine or dietary supplement for preventing and treating diseases resulting from inflammation and oxidative stress.
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Fessner ND, Weber H, Glieder A. Regiospecific 7-hydroxylation of ten-carbon monoterpenes by detoxifying CYP5035S7 monooxygenase of the white-rot fungus Polyporus arcularius. Biochem Biophys Res Commun 2022; 595:35-40. [DOI: 10.1016/j.bbrc.2022.01.072] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 01/18/2022] [Indexed: 12/22/2022]
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Fessner ND, Grimm C, Srdič M, Weber H, Kroutil W, Schwaneberg U, Glieder A. Natural Product Diversification by One‐Step Biocatalysis using Human P450 3A4. ChemCatChem 2021. [DOI: 10.1002/cctc.202101564] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Nico D. Fessner
- Institute of Molecular Biotechnology NAWI Graz Graz University of Technology Petersgasse 14 8010 Graz Austria
| | - Christopher Grimm
- Institute of Chemistry NAWI Graz University of Graz Heinrichstraße 28 8010 Graz Austria
| | - Matic Srdič
- SeSaM-Biotech GmbH Forckenbeckstraße 50 52074 Aachen Germany
- Bisy GmbH Wuenschendorf 292 Hofstätten an der Raab 8200 Hofstaetten Austria
| | - Hansjörg Weber
- Institute of Organic Chemistry NAWI Graz Graz University of Technology Stremayrgasse 9 8010 Graz Austria
| | - Wolfgang Kroutil
- Institute of Chemistry NAWI Graz University of Graz Heinrichstraße 28 8010 Graz Austria
| | - Ulrich Schwaneberg
- Institute of Biotechnology RWTH Aachen University Worringerweg 3 52074 Aachen Germany
| | - Anton Glieder
- Institute of Molecular Biotechnology NAWI Graz Graz University of Technology Petersgasse 14 8010 Graz Austria
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Benzannulated 5,5-spiroketal sesquiterpenes from the roots of Angelica Pubescens. Bioorg Chem 2020; 107:104604. [PMID: 33422712 DOI: 10.1016/j.bioorg.2020.104604] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 12/18/2020] [Accepted: 12/24/2020] [Indexed: 12/13/2022]
Abstract
Two new tetrahydrobenzannulated 5,5-spiroketal sesquiterpenes (1 and 2) and three novel benzannulated 5,5-spiroketal sesquiterpenes (3-5) namely angepubesins A-E, together with a new heliannane-type benzannulated sesquiterpene namely angepubesin F (6) and two known monoterpenes (7 and 8), were isolated from the roots of Angelica Pubescens. Their structures were identified by various spectroscopic analyses (NMR, MS, UV, IR), in combination with 13C NMR calculation as well as MAE, CMAE, DP4 + and MAEΔΔδ values analyses. The absolute configurations of 1-6 were determined by modified Mosher's method, ECD calculation and single-crystal X-ray diffraction (Cu Kα). Furthermore, the inhibitory activities of these isolated compounds against nitric oxide (NO) production induced by lipopolysaccharide (LPS) in RAW264.7 macrophage cells were evaluated. The results showed that compounds 2-4, 6 and 7, especially 6, displayed markedly inhibitory effects on NO production in a concentration-dependent manner. Mechanical study revealed that compound 6 could significantly inhibit the expression of nitric oxide synthase (iNOS) protein at a concentration of 10 μM. In addition, compound 6 suppressed the activation of JAK-STAT and NF-κB pathways.
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8
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Tao X, Thijssen S, Kotanko P, Ho CH, Henrie M, Stroup E, Handelman G. Improved dialytic removal of protein-bound uraemic toxins with use of albumin binding competitors: an in vitro human whole blood study. Sci Rep 2016; 6:23389. [PMID: 27001248 PMCID: PMC4802219 DOI: 10.1038/srep23389] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 03/03/2016] [Indexed: 01/29/2023] Open
Abstract
Protein-bound uraemic toxins (PBUTs) cause various deleterious effects in end-stage kidney disease patients, because their removal by conventional haemodialysis (HD) is severely limited by their low free fraction in plasma. Here we provide an experimental validation of the concept that the HD dialytic removal of PBUTs can be significantly increased by extracorporeal infusion of PBUT binding competitors. The binding properties of indoxyl sulfate (IS), indole-3-acetic acid (IAA) and hippuric acid (HIPA) and their binding competitors, ibuprofen (IBU), furosemide (FUR) and tryptophan (TRP) were studied in uraemic plasma. The effect of binding competitor infusion on fractional removal of PBUT was then quantified in an ex vivo single-pass HD model using uraemic human whole blood. The infusion of a combination of IBU and FUR increased the fractional removal of IS from 6.4 ± 0.1 to 18.3 ± 0.4%. IAA removal rose from 16.8 ± 0.3 to 34.5 ± 0.7%. TRP infusion increased the removal of IS and IAA to 10.5 ± 0.1% and 27.1 ± 0.3%, respectively. Moderate effects were observed on HIPA removal. Pre-dialyzer infusion of PBUT binding competitors into the blood stream can increase the HD removal of PBUTs. This approach can potentially be applied in current HD settings.
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Affiliation(s)
- Xia Tao
- University of Massachusetts Lowell, Lowell, MA, USA
- Renal Research Institute, NY, NY, USA
| | | | - Peter Kotanko
- Renal Research Institute, NY, NY, USA
- Icahn School of Medicine at Mount Sinai, New York, NY, USA
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Hu CL, Xiong J, Li JY, Gao LX, Wang WX, Cheng KJ, Yang GX, Li J, Hu JF. Rare Sesquiterpenoids from the Shed Trunk Barks of the Critically Endangered PlantAbies beshanzuensisand Their Bioactivities. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600165] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Son S, Ko SK, Jang M, Lee JK, Ryoo IJ, Lee JS, Lee KH, Soung NK, Oh H, Hong YS, Kim BY, Jang JH, Ahn JS. Ulleungamides A and B, Modified α,β-Dehydropipecolic Acid Containing Cyclic Depsipeptides from Streptomyces sp. KCB13F003. Org Lett 2015; 17:4046-9. [DOI: 10.1021/acs.orglett.5b01969] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Sangkeun Son
- Department
of Biomolecular Science, University of Science and Technology, Daejeon 305-333, Korea
| | - Sung-Kyun Ko
- Department
of Biomolecular Science, University of Science and Technology, Daejeon 305-333, Korea
| | - Mina Jang
- Department
of Biomolecular Science, University of Science and Technology, Daejeon 305-333, Korea
| | | | | | - Jung-Sook Lee
- Microbial
Resources Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 306-809, Korea
| | | | - Nak-Kyun Soung
- Department
of Biomolecular Science, University of Science and Technology, Daejeon 305-333, Korea
| | - Hyuncheol Oh
- College
of Pharmacy, Wonkwang University, Iksan 570-749, Korea
| | - Young-Soo Hong
- Department
of Biomolecular Science, University of Science and Technology, Daejeon 305-333, Korea
| | - Bo Yeon Kim
- Department
of Biomolecular Science, University of Science and Technology, Daejeon 305-333, Korea
| | - Jae-Hyuk Jang
- Department
of Biomolecular Science, University of Science and Technology, Daejeon 305-333, Korea
| | - Jong Seog Ahn
- Department
of Biomolecular Science, University of Science and Technology, Daejeon 305-333, Korea
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Daramwar PP, Rincy R, Niloferjahan S, Krithika R, Gulati A, Yadav A, Sharma R, Thulasiram HV. Transformation of (±)-lavandulol and (±)-tetrahydrolavandulol by a fungal strain Rhizopus oryzae. BIORESOURCE TECHNOLOGY 2012; 115:70-74. [PMID: 22153597 DOI: 10.1016/j.biortech.2011.11.038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Revised: 11/10/2011] [Accepted: 11/11/2011] [Indexed: 05/31/2023]
Abstract
Biotransformation of an irregular monoterpene alcohol, (±)-lavandulol [(±)-5-methyl-2-(1-methylethenyl)-4-hexen-1-ol] (I) and its tetrahydro derivative, (±)-tetrahydrolavandulol [(±)-2-isopropyl-5-methylhexan-1-ol] (II) were studied using a soil isolated fungal strain Rhizopus oryzae. Five metabolites, 2-((3,3-dimethyloxiran-2-yl)methyl)-3-methylbut-3-en-1-ol (Ia), 2-methyl-5-(prop-1-en-2-yl)hex-2-ene-1,6-diol (Ib), 2-methyl-5-(prop-1-en-2-yl)hexane-1,6-diol (Ic), 2-(3-methylbut-2-enyl)-3-methylenebutane-1,4-diol (Id), 5-methyl-2-(2-methyloxiran-2-yl)hex-4-en-1-ol (Ie) have been isolated from the fermentation medium and characterized with lavandulol as a substrate. When tetrahydrolavandulol used as a substrate, two metabolites 2-isopropyl-5-methylhexane-1,5-diol (IIa) and 2-isopentyl-3-methylbutane-1,3-diol (IIb) have been isolated from the fermentation medium. Biotransformation studies with R. oryzae clearly indicate that the organism initiates the transformation either by hydroxylation at allylic methyl groups or epoxidation of double bond. GC and GCMS analyses indicated that both (R)- and (S)-enantiomers of I and II have been transformed into corresponding hydroxylated or epoxy derivatives, when racemic I and II were used as substrates.
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Affiliation(s)
- Pankaj P Daramwar
- Division of Organic Chemistry, National Chemical Laboratory, Council of Scientific and Industrial Research (CSIR), Pune, India
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