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Related Concept Videos

Esters to Carboxylic Acids: Saponification01:25

Esters to Carboxylic Acids: Saponification

Esters can be hydrolyzed to carboxylic acids under acidic or basic conditions. Base-promoted hydrolysis of esters is a nucleophilic acyl substitution reaction in which esters react with an aqueous base, followed by an acid to give carboxylic acids. This reaction is also known as saponification because it forms the basis for making soaps from fats.
The reaction requires a base in stoichiometric amounts, which participates in the reaction and is not regenerated later. So, the base acts as a...
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Dipeptidyl peptidase 4 (DPP-4) is a serine protease widely distributed in the body. It's involved in the inactivation of GLP-1 and GIP hormones, which are crucial for insulin regulation. DPP-4 inhibitors, such as sitagliptin (Januvia), saxagliptin (Onglyza), linagliptin (Tradjenta), alogliptin (Nesina), and vildagliptin (Galvus), help increase the proportion of active GLP-1, enhancing insulin secretion. These inhibitors work by competitively binding to DPP-4. This binding causes a significant...
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Oral Hypoglycemic Agents: Glinides01:06

Oral Hypoglycemic Agents: Glinides

Repaglinide (Prandin) and Nateglinide (Starlix), known as glinides, are oral insulin secretagogues that stimulate insulin release from pancreatic β cells by closing the ATP-sensitive potassium channels (KATP channel). Repaglinide controls insulin release from pancreatic β cells by managing potassium efflux. It shares two binding sites with sulfonylureas and also has a unique site, indicating overlapping mechanisms of action. With a rapid onset and a 4-7 hour duration, it effectively manages...
Oral Hypoglycemic Agents: α-Glucosidase Inhibitors01:19

Oral Hypoglycemic Agents: α-Glucosidase Inhibitors

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Glucagon-like Receptor Agonists

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Related Experiment Video

Updated: Jul 16, 2026

Separation of Bioactive Small Molecules, Peptides from Natural Sources and Proteins from Microbes by Preparative Isoelectric Focusing (IEF) Method
09:57

Separation of Bioactive Small Molecules, Peptides from Natural Sources and Proteins from Microbes by Preparative Isoelectric Focusing (IEF) Method

Published on: June 14, 2020

Gleditsia saponins.

Y Okada1, K Takahashi, T Okuyama

  • 1Department of Pharmacognosy and Phytochemistry, Meiji College of Pharmacy, Tokyo, Japan.

Planta Medica
|October 1, 1982
PubMed
Summary

Gleditsia saponin C (GS-C), a triterpenoid saponin from Gleditsia japonica fruit, has an echinocystic acid core with sugars and unique monoterpenyl groups. These groups attach to specific sugar positions, clarifying GS-C

Area of Science:

  • Phytochemistry
  • Natural Products Chemistry

Background:

  • Gleditsia japonica Miq. (Leguminosae) fruit capsules contain saponins, including the major triterpenoid saponin, gleditsia saponin C (GS-C).
  • Understanding the detailed chemical structure of bioactive natural products like GS-C is crucial for their potential applications.

Purpose of the Study:

  • To elucidate the complete chemical structure of gleditsia saponin C (GS-C).
  • To determine the specific attachment sites of the monoterpenyl moieties within the GS-C molecule.

Main Methods:

  • Methylation analysis of GS-C.
  • Gas-liquid chromatography (GLC) and mass spectrometry (MS) for structural determination.
  • Analysis of the oligoside portion and attached monoterpenyl groups.

Main Results:

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  • GS-C comprises echinocystic acid, eight sugar units, and two distinct monoterpenyl groups: (+)2,6-dimethyl- and (+)2-hydroxymethyl-6-methyl-6-(S)hydroxy-2-trans-2,7-octadienoyl.
  • Methylation analysis confirmed that the monoterpenyl moieties are attached to the 2- and 3-positions of the terminal L-rhamnose within the C-28 oligoside chain.

Conclusions:

  • The detailed structural characterization of GS-C provides a foundation for further research into its biological activities.
  • The precise localization of the monoterpenyl groups offers insights into the structure-activity relationships of this triterpenoid saponin.