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Muyenga TA, Bamitale SKD, Kibuule D, Sithole S, Mukanganyama S, Rudolph C, Venables L, Hattingh AC, van de Venter M, Ezeala CC. Kigelia africana fruit fractions inhibit in vitro alpha-glucosidase activity: a potential natural alpha-glucosidase inhibitor. BMC Complement Med Ther 2024; 24:230. [PMID: 38867199 PMCID: PMC11167833 DOI: 10.1186/s12906-024-04510-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Accepted: 05/21/2024] [Indexed: 06/14/2024] Open
Abstract
BACKGROUND Diabetes affects 75% of people in low-income countries, where conventional drugs like metformin are available, but newer drugs like alpha-glucosidase inhibitors are not accessible to most Southern African patients. AIM To evaluate the α-glucosidase and α-amylase inhibitory activities of fractionated aqueous extracts of Kigelia africana fruit (KAFE) and their phytochemical fingerprints using gas chromatography-mass spectrometry (GC-MS). MATERIALS AND METHODS We studied K. africana fruit fractions' inhibitory effects on alpha-glucosidase and alpha-amylase using bioassay-guided fractionation, and analyzed their phytochemical profiles with GC-MS. KEY FINDINGS Both the aqueous extract and ethyl acetate fraction of the aqueous extract exhibited a low dose-dependent inhibition of alpha-amylase activity (p < 0.0001). At a concentration of 500 μg/mL, the aqueous extract caused an alpha-glucosidase inhibition of 64.10 ± 2.7%, with an estimated IC50 of 193.7 μg/mL, while the ethyl acetate fraction had an inhibition of 89.82 ± 0.8% and an estimated IC50 of 10.41 μg/mL. The subfraction G, which had the highest alpha-glucosidase inhibitory activity at 85.10 ± 0.7%, had significantly lower activity than the ethyl acetate fraction. The most bioactive fraction was found to contain 11"(2-cyclopenten-1-yl) undecanoic acid, ( +)- and cyclopentane undecanoic acid as well as the indole alkaloids Akuammilan-17-ol-10-methoxy, N-nitroso-2-methyl-oxazolidine and epoxide Oxirane2.2″ -(1.4-butanediyl) bis-. CONCLUSION The K. africana fruit fraction demonstrated significant alpha-glucosidase inhibitory activity, while its alpha-amylase inhibitory activity was limited. This study suggests a potential natural alpha-glucosidase inhibitor and phytocompounds that could serve as leads for developing antidiabetic agents.
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Affiliation(s)
- Tumelo Akapelwa Muyenga
- Department of Physiological Sciences, School of Medicine and Health Sciences, Mulungushi University, P.O. Box 60009, Livingstone, Zambia.
- Department of Pharmacology and Therapeutics, Faculty of Health and Veterinary Sciences, University of Namibia, Windhoek, Namibia.
| | - Samuel K Dominion Bamitale
- Department of Internal Medicine and Pharmacology, Faculty of Medicine, and Health Sciences, Eastern Cape, Walter Sisulu University, Mthatha, South Africa
| | - Dan Kibuule
- Department of Pharmacology and Therapeutics, Faculty of Health Sciences, Busitema University, Busitema, Uganda
| | - Simbarashe Sithole
- Department of Chemistry and Earth Sciences, University of Zimbabwe, Mt. Pleasant, Harare, Zimbabwe
| | - Stanley Mukanganyama
- Department of Biotechnology and Biotechnology, University of Zimbabwe, Mt. Pleasant, Harare, Zimbabwe
| | - Carlen Rudolph
- Department of Biochemistry and Microbiology, Nelson Mandela University, Port Elizabeth, South Africa
| | - Luanne Venables
- Department of Biochemistry and Microbiology, Nelson Mandela University, Port Elizabeth, South Africa
| | - Anna C Hattingh
- Department of Biochemistry and Microbiology, Nelson Mandela University, Port Elizabeth, South Africa
| | - Maryna van de Venter
- Department of Biochemistry and Microbiology, Nelson Mandela University, Port Elizabeth, South Africa
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Ianni F, Carotti A, Protti M, Favilli A, Gerli S, Furlanetto S, Mercolini L, Sardella R. Chiral high-performance liquid chromatography analysis of mono-, di-, and triacylglycerols with amylose- and cellulose-phenylcarbamate-based stationary phases. J Pharm Biomed Anal 2023; 236:115720. [PMID: 37729743 DOI: 10.1016/j.jpba.2023.115720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 08/22/2023] [Accepted: 09/12/2023] [Indexed: 09/22/2023]
Abstract
The ever-increasing technological advancement in the (ultra)high-performance liquid chromatography tandem (high-resolution) mass spectrometry platforms have largely contributed to steeply intensify the interest towards lipidomics research. However, mass spectrometers alone are unable to distinguish between enantiomers. This obstacle is especially evident in the case of glycerolipids analysis due the prochiral nature of glycerol. Until a couple of decades ago, the stereoselective analysis of triacylglycerols (TAGs) was performed on the end products generated either from their enzymatic or chemical hydrolysis, namely on mono- or diacyl-sn-glycerols (MAGs and DAGs, respectively). These were then mostly analyzed with Pirkle-type chiral stationary phases (CSPs) after dedicated multi-step derivatization procedures. One of the most significant drawbacks of these traditional methods for enantioselective TAGs analysis (actually of the produced MAGs and DAGs, often investigated as target species per se) was the difficulty to totally abolish the migration of fatty acyls between glycerol positions. This made difficult to control and keep unaltered the stereochemistry of the original molecules. Over the last two decades, it has been widely demonstrated that the enantioselective analysis of intact TAGs as well as of non-derivatized MAGs and DAGs can be efficiently obtained using polysaccharide-based CSPs incorporating either amylose- or cellulose-phenylcarbamate derivatives chiral selectors. In this paper, the enantioselective methods developed with these CSPs for the enantioselective direct LC analysis of MAGs, DAGs and TAGs embedding different types of fatty acid residues are comprehensively reviewed.
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Affiliation(s)
- Federica Ianni
- Department of Pharmaceutical Sciences, University of Perugia, Via Fabretti 48, 06123 Perugia, Italy
| | - Andrea Carotti
- Department of Pharmaceutical Sciences, University of Perugia, Via Fabretti 48, 06123 Perugia, Italy
| | - Michele Protti
- Department of Pharmacy and Biotechnology (FaBiT), Alma Mater Studiorum - University of Bologna, Via Belmeloro 6, 40126 Bologna, Italy
| | - Alessandro Favilli
- Department of Medicine and Surgery, University of Perugia, Piazzale Gambuli 1, 06132 Perugia, Italy
| | - Sandro Gerli
- Department of Medicine and Surgery, University of Perugia, Piazzale Gambuli 1, 06132 Perugia, Italy; Center for Perinatal and Reproductive Medicine, University of Perugia, Santa Maria della Misericordia University Hospital, 06132 Perugia, Italy
| | - Sandra Furlanetto
- Department of Chemistry "U. Schiff", University of Florence, Via U. Schiff 6, 50019 Florence, Italy
| | - Laura Mercolini
- Department of Pharmacy and Biotechnology (FaBiT), Alma Mater Studiorum - University of Bologna, Via Belmeloro 6, 40126 Bologna, Italy.
| | - Roccaldo Sardella
- Department of Pharmaceutical Sciences, University of Perugia, Via Fabretti 48, 06123 Perugia, Italy; Center for Perinatal and Reproductive Medicine, University of Perugia, Santa Maria della Misericordia University Hospital, 06132 Perugia, Italy.
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Structural Characterization of Mono- and Dimethylphosphatidylethanolamines from Various Organisms Using a Complex Analytical Strategy Including Chiral Chromatography. Symmetry (Basel) 2022. [DOI: 10.3390/sym14030616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Two minor phospholipids, i.e., mono- and/or dimethylphosphatidylethanolamines, are widespread in many organisms, from bacteria to higher plants and animals. A molecular mixture of methyl-PE and dimethyl-PE was obtained from total lipids by liquid chromatography and further identified by mass spectrometry. Total methyl-PE and dimethyl-PE were cleaved by phospholipase C, and the resulting diacylglycerols, in the form of acetyl derivatives, were separated into alkyl-acyl, alkenyl-acyl, and diacylglycerols. Reversed-phase LC/MS allowed dozens of molecular species to be identified and further analyzed. This was performed on a chiral column, and identification by tandem positive ESI revealed that diacyl derivatives from all four bacteria were mixtures of both R and S enantiomers. The same applied to alkenyl-acyl derivatives of anaerobic bacteria. Analysis thus confirmed that some bacteria biosynthesize phospholipids having both sn-glycerol-3-phosphate and sn-glycerol-1-phosphate as precursors. These findings were further supported by data already published in GenBank. The use of chiral chromatography made it possible to prove that both enantiomers of glycerol phosphate of some molecular species of mono- and dimethylphosphatidylethanolamines are present. The result of the analysis can be interpreted that the cultured bacteria do not have homochiral membranes but, on the contrary, have an asymmetric, i.e., heterochiral membranes.
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Regio- and Stereospecific Analysis of Triacylglycerols—A Brief Overview of the Challenges and the Achievements. Symmetry (Basel) 2022. [DOI: 10.3390/sym14020247] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The efforts to reveal, in detail, the molecular and intramolecular structures of one of the main lipid classes, namely, triacyl-sn-glycerols, which are now known to affect their specific and important role in all living organisms, are briefly overviewed. Some milestones of significance in the gradual but continuous development and improvement of the analytical methodology to identify the triacylglycerol regio- and stereoisomers in complex lipid samples are traced throughout the years: the use of chromatography based on different separation principles; the improvements in the chromatographic technique; the development and use of different detection techniques; the attempts to simplify and automatize the analysis without losing the accuracy of identification. The spectacular recent achievements of two- and multidimensional methods used as tools in lipidomics are presented.
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Zhuo S, Zhang X, Luo H, Wang X, Ji Y. The Application of Covalent Organic Frameworks for Chiral Chemistry. Macromol Rapid Commun 2020; 41:e2000404. [PMID: 32935899 DOI: 10.1002/marc.202000404] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 08/30/2020] [Indexed: 12/13/2022]
Abstract
Covalent organic frameworks (COFs) made their debut in 2005 and caused enthusiastic attention because of their ordered, crystalline structure. They are constructed with pure organic building blocks that are linked together by robust covalent linkages. COFs are applied in numerous fields due to their large surface area, architecture and chemistry stabilities, functional pore walls, and tunable frameworks. Incorporating COFs with chiral compounds can build chiral COFs (CCOFs), which have exhibited significant advantages in the chiral chemistry field. This review focuses on the applications of COFs for chiral catalysis, chiral separation, and chiral sensoring up to now. Furthermore, the synthesis and design strategies of CCOFs are also discussed in this article, since the COFs used in chiral chemistry are generally CCOFs. There also sums up the benefits and defects of COFs used in the chiral field and outlines future opportunities. The studies described in this review demonstrate not only the advantages of COFs in practical use but also novel solutions for the problems in the chirality area.
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Affiliation(s)
- Siqi Zhuo
- Department of Analytical Chemistry, China Pharmaceutical University, Nanjing, 210009, China.,Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education, Nanjing, 210009, China
| | - Xiaoyue Zhang
- Department of Analytical Chemistry, China Pharmaceutical University, Nanjing, 210009, China.,Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education, Nanjing, 210009, China
| | - Huan Luo
- Department of Analytical Chemistry, China Pharmaceutical University, Nanjing, 210009, China.,Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education, Nanjing, 210009, China
| | - Xuehua Wang
- Department of Analytical Chemistry, China Pharmaceutical University, Nanjing, 210009, China.,Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education, Nanjing, 210009, China
| | - Yibing Ji
- Department of Analytical Chemistry, China Pharmaceutical University, Nanjing, 210009, China.,Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education, Nanjing, 210009, China
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Separation of triacylglycerols containing allenic and acetylenic fatty acids by enantiomeric liquid chromatography-mass spectrometry. J Chromatogr A 2020; 1623:461161. [DOI: 10.1016/j.chroma.2020.461161] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 04/20/2020] [Accepted: 04/22/2020] [Indexed: 01/25/2023]
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