Related Experiment Video
Updated: Jun 19, 2026
13:35
Structural Biology and Analytical Chemistry Approaches for Characterizing C-Glycoside Metabolic Enzymes in Human Gut Microbiota
Published on: May 23, 2025
Bioactive microbial metabolites from glycyrrhetinic acid
Galal T Maatooq1, Amani M Marzouk, Alexander I Gray
1Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt.
Phytochemistry
|October 20, 2009
Summary
Microbial biotransformation of glycyrrhetinic acid yielded seven metabolites, including three novel compounds. These metabolites were assessed for their significant hepatoprotective effects against various liver injury models.
Area of Science:
- Natural Product Chemistry
- Microbial Biotechnology
- Pharmacology
Background:
- 18beta-glycyrrhetinic acid is a key component of licorice root with known therapeutic properties.
- Microbial biotransformation offers a sustainable route to generate novel derivatives of natural products.
- Exploring new glycyrrhetinic acid derivatives is crucial for discovering enhanced pharmacological activities.
Purpose of the Study:
- To biotransform 18beta-glycyrrhetinic acid using specific microbial strains.
- To identify and characterize the resulting metabolites using advanced spectroscopic techniques.
- To evaluate the hepatoprotective potential of the major metabolites.
Main Methods:
- Microbial fermentation of 18beta-glycyrrhetinic acid with Absidia pseudocylinderospora, Gliocladium viride, and Cunninghamella echinulata.
- Structure elucidation of metabolites using 1H, 13C NMR, DEPT, 1H-1H COSY, HMBC, and HMQC.
- In vitro assays: FeCl3/ascorbic acid-induced lipid peroxidation and nitric oxide production in rat macrophages.
- In vivo assay: Carbon tetrachloride (CCl4)-induced hepatotoxicity in albino mice.
Main Results:
- Seven metabolites were produced, with three identified as new chemical entities: 15alpha-hydroxy-18alpha-glycyrrhetinic acid, 13beta-hydroxy-7alpha,27-oxy-12-dihydro-18beta-glycyrrhetinic acid, and 1alpha-hydroxy-18beta-glycyrrhetinic acid.
- Detailed 13C NMR data for the known metabolite 7beta, 15alpha-dihydroxy-18beta-glycyrrhetinic acid were reported for the first time.
- Major metabolites demonstrated significant hepatoprotective activity in both in vitro and in vivo models, including protection against lipid peroxidation and CCl4-induced liver damage.
Conclusions:
- Microbial biotransformation is an effective method for generating novel glycyrrhetinic acid derivatives.
- The newly synthesized metabolites hold promise as potential therapeutic agents for liver diseases.
- Further research into the mechanism of action of these hepatoprotective metabolites is warranted.
Related Concept Videos
01:25Production of Organic Acids
Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...
01:22Probiotics
Probiotics are live, non-pathogenic microorganisms that confer health benefits by modulating the gut microbiota. The human gastrointestinal tract harbors a complex microbial ecosystem, and the balance of this microbiota is crucial for digestive and systemic health. Among the most extensively studied and utilized probiotics are species formerly classified within the genera Lactobacillus and Bifidobacterium. These organisms not only naturally colonize the human gut but are also consumed through...
01:18Functions of the Gut Microbiota
The gut microbiota includes trillions of microorganisms that colonize the human gastrointestinal tract, including bacteria, archaea, viruses, and fungi. This complex ecosystem plays a critical role in maintaining intestinal and systemic health. Most of these microbes inhabit the large intestine, establishing a relatively stable and diverse community that contributes to gut homeostasis through various metabolic, immunological, and protective mechanisms.Dominant bacterial phyla, such as...
01:27Microorganisms in Agriculture and Food industry
Microorganisms play a crucial role in agriculture and the food industry, contributing to soil fertility, crop protection, and food production. Their functions range from nitrogen fixation and biopesticide production to fermentation and food preservation, making them indispensable to sustainable farming and food safety.Role in AgricultureNitrogen-fixing bacteria, such as Rhizobium (symbiotic) and Azotobacter (free-living), convert atmospheric nitrogen into ammonia through biological nitrogen...
01:23Microbial Fermentation
Fermentation is a crucial anaerobic metabolic process that enables microbes to derive energy from sugar without relying on oxygen or an electron transport chain. This process is fundamental to various biological and industrial applications and is classified based on the metabolic products generated.Role of Pyruvate in FermentationPyruvate and its derivatives serve as key electron acceptors in fermentative pathways. The oxidation of NADH to regenerate NAD+ is essential for the continuation of...
01:29Microbes in Food Production
Microbial fermentation is central to food biotechnology, enhancing flavor, texture, preservation, and stability. Fermentative microorganisms metabolize carbohydrates into organic acids, alcohols, and other metabolites that inhibit spoilage organisms and improve digestibility while contributing distinctive sensory qualities.In baking, amylases naturally present in flour hydrolyze starch into monosaccharides such as glucose, which Saccharomyces cerevisiae ferments anaerobically. Through...