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Simon P, Lőrinczi B, Szatmári I. Alkoxyalkylation of Electron-Rich Aromatic Compounds. Int J Mol Sci 2024; 25:6966. [PMID: 39000077 PMCID: PMC11241777 DOI: 10.3390/ijms25136966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2024] [Revised: 06/17/2024] [Accepted: 06/20/2024] [Indexed: 07/16/2024] Open
Abstract
Alkoxyalkylation and hydroxyalkylation methods utilizing oxo-compound derivatives such as aldehydes, acetals or acetylenes and various alcohols or water are widely used tools in preparative organic chemistry to synthesize bioactive compounds, biosensors, supramolecular compounds and petrochemicals. The syntheses of such molecules of broad relevance are facilitated by acid, base or heterogenous catalysis. However, degradation of the N-analogous Mannich bases are reported to yield alkoxyalkyl derivatives via the retro-Mannich reaction. The mutual derivative of all mentioned species are quinone methides, which are reported to form under both alkoxy- and aminoalkylative conditions and via the degradation of the Mannich-products. The aim of this review is to summarize the alkoxyalkylation (most commonly alkoxymethylation) of electron-rich arenes sorted by the methods of alkoxyalkylation (direct or via retro-Mannich reaction) and the substrate arenes, such as phenolic and derived carbocycles, heterocycles and the widely examined indole derivatives.
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Affiliation(s)
- Péter Simon
- Institute of Pharmaceutical Chemistry, University of Szeged, Eötvös u. 6, H-6720 Szeged, Hungary
| | - Bálint Lőrinczi
- Institute of Pharmaceutical Chemistry, University of Szeged, Eötvös u. 6, H-6720 Szeged, Hungary
| | - István Szatmári
- Institute of Pharmaceutical Chemistry, University of Szeged, Eötvös u. 6, H-6720 Szeged, Hungary
- HUN REN SZTE Stereochemistry Research Group, University of Szeged, Eötvös u. 6, H-6720 Szeged, Hungary
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Systems metabolic engineering upgrades Corynebacterium glutamicum to high-efficiency cis, cis-muconic acid production from lignin-based aromatics. Metab Eng 2023; 75:153-169. [PMID: 36563956 DOI: 10.1016/j.ymben.2022.12.005] [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: 10/13/2022] [Revised: 12/14/2022] [Accepted: 12/17/2022] [Indexed: 12/24/2022]
Abstract
Lignin displays a highly challenging renewable. To date, massive amounts of lignin, generated in lignocellulosic processing facilities, are for the most part merely burned due to lacking value-added alternatives. Aromatic lignin monomers of recognized relevance are in particular vanillin, and to a lesser extent vanillate, because they are accessible at high yield from softwood-lignin using industrially operated alkaline oxidative depolymerization. Here, we metabolically engineered C. glutamicum towards cis, cis-muconate (MA) production from these key aromatics. Starting from the previously created catechol-based producer C. glutamicum MA-2, systems metabolic engineering first discovered an unspecific aromatic aldehyde reductase that formed aromatic alcohols from vanillin, protocatechualdehyde, and p- hydroxybenzaldehyde, and was responsible for the conversion up to 57% of vanillin into vanillyl alcohol. The alcohol was not re-consumed by the microbe later, posing a strong drawback on the producer. The identification and subsequent elimination of the encoding fudC gene completely abolished vanillyl alcohol formation. Second, the initially weak flux through the native vanillin and vanillate metabolism was enhanced up to 2.9-fold by implementing synthetic pathway modules. Third, the most efficient protocatechuate decarboxylase AroY for conversion of the midstream pathway intermediate protocatechuate into catechol was identified out of several variants in native and codon optimized form and expressed together with the respective helper proteins. Fourth, the streamlined modules were all genomically combined which yielded the final strain MA-9. MA-9 produced bio-based MA from vanillin, vanillate, and seven structurally related aromatics at maximum selectivity. In addition, MA production from softwood-based vanillin, obtained through alkaline depolymerization, was demonstrated.
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Kumar M, Zheng Z, Nishshanka U, Xia H, Weisbecker C, Attygalle AB. Fragmentation pathways of deprotonated ortho-hydroxybenzyl alcohol. JOURNAL OF MASS SPECTROMETRY : JMS 2022; 57:e4829. [PMID: 35581161 DOI: 10.1002/jms.4829] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Revised: 03/11/2022] [Accepted: 03/11/2022] [Indexed: 06/15/2023]
Abstract
The ortho, meta, and para isomers of hydroxybenzyl alcohol can be unequivocally distinguished by the collision-induced dissociation mass spectra of their anions. The presence of a prominent peak at m/z 121 for an elimination of a dihydrogen molecule renders the ortho-isomer spectrum markedly different from those of its meta and para congeners. Investigations carried out with deuterium-labeled isotopologues of the ortho isomer verified that the labile hydrogen atom on the hydroxyl group and one of the benzylic hydrogen atoms are specifically removed in the formation of the m/z 121 ion. The ortho-isomer spectrum also showed a prominent peak at m/z 93. Experimental data indicated that the m/z 93 product ion originates either from a two-step H2 and CO elimination mechanism or from a direct loss of a HCHO molecule from the precursor anion. The intensity ratio of the m/z 93 and 94 peaks in the spectrum recorded from the m/z 124 ion generated from a sample of o-hydroxybenzyl alcohol dissolved in D2 O supported the notion that the direct HCHO loss is the more dominant pathway for the generation of the phenolate ion under low activation conditions. In contrast, the two-step mechanism becomes the more dominant pathway under high collisional activation conditions. The spectrum also showed a weak peak at m/z 105 for a water loss. Based on computational data, the m/z 105 ion generated in this way appears to be a composite generated from a common ion-neutral complex intermediate in which a hydroxyl anion is positioned equidistantly between one of the benzylic hydrogens and a nearby hydrogen atom of the benzene ring. Upon activation, the complex dissociates to form either a phenide or a quinone methide anion. The reaction forming a carbon dioxide adduct under ion-mobility conditions was used to support the proposed water-loss mechanism.
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Affiliation(s)
- Meenu Kumar
- Center for Mass Spectrometry, Department of Chemistry, Chemical Biology and Biomedical Engineering, Stevens Institute of Technology, Hoboken, New Jersey, USA
| | - Zhaoyu Zheng
- Center for Mass Spectrometry, Department of Chemistry, Chemical Biology and Biomedical Engineering, Stevens Institute of Technology, Hoboken, New Jersey, USA
| | - Upul Nishshanka
- Center for Mass Spectrometry, Department of Chemistry, Chemical Biology and Biomedical Engineering, Stevens Institute of Technology, Hoboken, New Jersey, USA
| | - Hanxue Xia
- Center for Mass Spectrometry, Department of Chemistry, Chemical Biology and Biomedical Engineering, Stevens Institute of Technology, Hoboken, New Jersey, USA
| | - Carl Weisbecker
- Center for Mass Spectrometry, Department of Chemistry, Chemical Biology and Biomedical Engineering, Stevens Institute of Technology, Hoboken, New Jersey, USA
| | - Athula B Attygalle
- Center for Mass Spectrometry, Department of Chemistry, Chemical Biology and Biomedical Engineering, Stevens Institute of Technology, Hoboken, New Jersey, USA
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Choi JH, Lee HJ, Park SE, Kim S, Seo KS, Kim KM. Cytotoxicity, metabolic enzyme inhibitory, and anti-inflammatory effect of Lentinula edodes fermented using probiotic lactobacteria. J Food Biochem 2021; 45:e13838. [PMID: 34212412 DOI: 10.1111/jfbc.13838] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 05/19/2021] [Accepted: 06/09/2021] [Indexed: 01/25/2023]
Abstract
We found that the fermented Lentinula edodes (FLE) products exhibited various differences in terms of proximate composition, free sugar, and amino acid. In particular, there were higher levels of ergosterol, and ergothioneine in FLE-Pediococcus pentosaceus (PP) and -Lactobacillus acidophilus (LA) than in the L. edodes (LE) products. The survival rates of lactic acid bacteria (LAB) strains on artificial gastric juice, artificial bile, or heat (50-60°C) were observed to vary from 60%-66%, 60%-66%, to 42%-79%, respectively. The FLE products up to 300 μg/ml had no cytotoxicity on RAW264.7, AGS, and RBL-2H3 cells, but inhibited the activities of α-amylase, α-glucosidase, and pancreatic lipase, as well as the production of nitrite, IL-1β, IL-4, TNF-α, and prostaglandin E2 (PGE2) from lipopolysaccharide (LPS)-induced inflammatory response. Our findings suggest that FLE products have metabolic enzyme inhibitory and anti-inflammatory effects. PRACTICAL APPLICATIONS: Fermentation plays a critical role in improving the functional and nutritional properties of food. In addition, lactobacteria are the main microorganisms involved in the fermentation of food known to have a variety of biological activities. Therefore, the utilization of lactobacteria for research and development of mushroom food materials can be used as a key strategy to improve the biological activity characteristics of mushroom food materials and to increase their active ingredient content. The present results show that FLE products had promising inhibitory efficacies against the activities of obesity-related metabolic enzymes and LPS-induced inflammatory response. These suggest that FLE products have the potential to be developed as functional probiotic dietary supplements or food products.
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Affiliation(s)
- Jun-Hui Choi
- Department of Food Science and Biotechnology, Gwangju University, Gwangju, Republic of Korea
| | - Hyo-Jeong Lee
- Department of Food Science and Biotechnology, Gwangju University, Gwangju, Republic of Korea
| | - Se-Eun Park
- Department of Food Science and Biotechnology, Gwangju University, Gwangju, Republic of Korea
| | - Seung Kim
- Department of Food Science and Biotechnology, Gwangju University, Gwangju, Republic of Korea
| | - Kyoung-Sun Seo
- Jangheung County Mushroom Research Institute, Jangheung, Republic of Korea
| | - Ki-Man Kim
- Department of Food Science and Biotechnology, Gwangju University, Gwangju, Republic of Korea
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Choi JH, Kim MK, Yeo SH, Kim S. Short-term Cudrania tricuspidata fruit vinegar administration attenuates obesity in high-fat diet-fed mice by improving fat accumulation and metabolic parameters. Sci Rep 2020; 10:21102. [PMID: 33273564 PMCID: PMC7712837 DOI: 10.1038/s41598-020-78166-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 11/18/2020] [Indexed: 12/15/2022] Open
Abstract
Previous studies have suggested that vinegar intake can help to reduce body fat and hyperglycemia. Therefore, this study aimed to evaluate the anti-obesity efficacy of vinegar fermented using Cudrania tricuspidata fruits (CTFV) and its main phenolic constituents and to analyze its molecular mechanism and changes in obesity-related metabolizing enzymatic activities. We found that HFD significantly caused hepatic steatosis; increases in body fats, feed efficiency, liver mass, lipids, insulin, oxidative parameters, cardiovascular-associated risk indices, lipase and α-amylase activities, whereas CTFV efficaciously attenuated HFD-induced oxidant stress, fat accumulation, obesity-related enzymatic activity, and the activation or reduction of obesity-related molecular reactions via improving metabolic parameters including phosphorylated insulin receptor substrate 1, protein tyrosine phosphatase 1B, phosphorylated phosphoinositide 3-kinase/protein kinase B, phosphorylated mitogen-activated protein kinases, sterol regulatory element-binding protein 1c, CCAAT/enhancer-binding protein, and fatty acid synthase; and decreases in adiponectin receptor 1, leptin receptor, adenosine monophosphate-activated protein kinase, acetyl-CoA carboxylase, and peroxisome proliferator-activated receptor, subsequently ameliorating HFD-induced obesity. Therefore, CTFV might provide a functional food resource or nutraceutical product for reducing body fat accumulation.
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Affiliation(s)
- Jun-Hui Choi
- Department of Food Science and Biotechnology, Gwangju University, Gwangju, 503-703, Republic of Korea
| | - Myung-Kon Kim
- Department of Food Science and Technology, Chonbuk National University, Iksan, 570-752, Republic of Korea
| | - Soo-Hwan Yeo
- Fermented Processing Food Science Division, Department of Agrofood Resource, National Academy of Agricultural Science, RDA, Wanju, 55365, Republic of Korea
| | - Seung Kim
- Department of Food Science and Biotechnology, Gwangju University, Gwangju, 503-703, Republic of Korea.
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Chemical Composition and Antioxidant Activity of Steam-Distilled Essential Oil and Glycosidically Bound Volatiles from Maclura Tricuspidata Fruit. Foods 2019; 8:foods8120659. [PMID: 31835417 PMCID: PMC6963948 DOI: 10.3390/foods8120659] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 12/02/2019] [Accepted: 12/05/2019] [Indexed: 02/06/2023] Open
Abstract
Essential oil obtained from Maclura triscuspidata fruit has been reported to have functional properties. This study aimed at determining chemical compositions and antioxidant activities of steam-distilled essential oil (SDEO) and glycosidically bound aglycone fraction (GBAF) isolated from fully ripe M. triscuspidata fruit. SDEO was isolated by simultaneous steam distillation and extraction (SDE). GBAF was prepared by Amberlite XAD-2 adsorption of methanol extract, followed by methanol elution and enzymatic hydrolysis. Both fractions were analyzed by gas chromatography–mass spectrometry (GC–MS). A total of 76 constituents were identified from both oils. Apart from fatty acids and their esters, the SDEO contained p-cresol in the highest concentration (383.5 ± 17.7), followed by δ-cadinene (147.7 ± 7.7), β-caryophyllene (145.7 ± 10.5), β-ionone (141.0 ± 4.5), n-nonanal (140.3 ± 20.5), theaspirane A (121.3 ± 4.5) and theaspirane B (99.67 ± 9.05 µg/g). Thirteen carotenoid-derived compounds identified in the SDEO are being isolated from M. triscuspidata fruit for the first time. Out of the 22 components identified in GBAF, 14 were present only in the glycosidically bound volatiles. Antioxidant activity of the GBAF was higher than that of SDEO. These results suggest that glycosidically bound volatiles of M. triscuspidata fruit have a good potential as natural antioxidants.
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Choi JH, Lee HJ, Kim YS, Yeo SH, Kim S. Effects of Maclura tricuspidata (Carr.) Bur fruits and its phytophenolics on obesity-related enzymes. J Food Biochem 2019; 44:e13110. [PMID: 31792999 DOI: 10.1111/jfbc.13110] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 10/22/2019] [Accepted: 11/11/2019] [Indexed: 11/30/2022]
Abstract
The purpose of the present study was to investigate whether several phytophenolic ingredients isolated from Maclura tricuspidata (Carr.) Bur fruits inhibit the activity of obesity-related enzymes including pancreatic lipase, α-amylase, β-glucosidase, phosphodiesterase IV, alkaline phosphatase, and citrate synthase, and the compounds play as an inhibitor against the target enzymes in kinetic studies. The enzyme assays indicated that the fruit extract and its phytophenolic compounds inhibited significantly the enzymatic activity of the five target enzymes. The kinetic studies demonstrated that the inhibitory properties of p-hydroxybenzoic acid (4-HA), protocatechuic acid (PA), and isovanillic acid (IA) against pancreatic lipase, β-glucosidase, citrate synthase, or alkaline phosphatase. Our results suggested that the compounds detected from Maclura tricuspidata (Carr.) Bur fruit extract may regulate carbohydrate/lipid/energy metabolism by obesity-related enzymes' inhibition. PRACTICAL APPLICATIONS: The obesity-related metabolizing enzymes affect (in)directly the metabolites absorption on carbohydrate/lipid/energy metabolism. Accordingly, it is an important strategy to treat obesity through target pathways and enzymes which include the reduction in energy intake and consumption. In our results, Maclura tricuspidata (Carr.) Bur fruit extract and its phytophenolic compounds inhibited significantly the enzymatic activity of the five target enzymes, in particular, 4-HA, PA, and IA have each specific inhibition type on pancreatic lipase, β-glucosidase, citrate synthase, and alkaline phosphatase. Therefore, M. tricuspidata (Carr.) Bur fruit may be a strong candidate as a food material or therapeutic agent for obesity improvement.
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Affiliation(s)
- Jun-Hui Choi
- Department of Food Science and Biotechnology, Gwangju University, Gwangju, Republic of Korea
| | - Hyo-Jeong Lee
- Department of Food Science and Biotechnology, Gwangju University, Gwangju, Republic of Korea
| | - Yoon-Sik Kim
- Department of Department of Clinical Laboratory Science, Dongkang College, Gwangju, Republic of Korea
| | - Soo-Hwan Yeo
- Department of Agro-Food Resource, National Academy of Agricultural Science, RDA, Suwon, Republic of Korea
| | - Seung Kim
- Department of Food Science and Biotechnology, Gwangju University, Gwangju, Republic of Korea
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