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Digitonin, also known as digitalis saponin, is a natural glycoside derived from the leaves and seeds of Digitalis purpurea, appearing as a white crystalline powder. The molecular formula is C56H92O29, CAS 11024-24-1, and the molecular weight is 1229.312 Daltons (Da). The solubility in water is low, but it has good solubility in anhydrous ethanol. This property enables the extraction and purification of digitalis saponins in the laboratory using anhydrous ethanol. As a steroid saponin, its structural characteristics lie in its aglycone moiety and sugar moiety. The glycoside moiety mainly consists of one molecule of digitogenin, while the sugar moiety includes two molecules of D-glucose, two molecules of half lactose, and one molecule of xylose. These sugar components bind to the hydroxyl group of the third carbon atom of the digitalis saponin ligand through specific chemical bonds, forming a stable compound structure. As a natural compound extracted from digitalis plants, it has a long history and extensive application value. Since ancient times, digitalis plants have been used to treat heart related diseases, and digitalis saponins, as their main active ingredient, have significant biological activity and pharmacological effects.
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Chemical Formula |
C56H92O29 |
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Exact Mass |
1229 |
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Molecular Weight |
1229 |
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m/z |
1229 (100.0%), 1230 (60.6%), 1231 (18.0%), 1231 (6.0%), 1232 (3.6%), 1232 (3.5%), 1230 (1.1%), 1233 (1.1%), 1230 (1.1%) |
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Elemental Analysis |
C, 54.71; H, 7.54; O, 37.74 |
Digitonin, as a natural compound extracted from Digitalis plants, have a long history and extensive application value. Since ancient times, digitalis plants have been used to treat heart related diseases, and digitalis saponins, as their main active ingredient, have significant biological activity and pharmacological effects.
Pharmacological effects of digitalis saponins
Cardiotonic effect
Digitalis saponins are a class of alkaloids with cardiotonic effects, which can enhance myocardial contractility and improve symptoms in patients with heart failure. It inhibits the activity of the sodium potassium ATPase receptor on the myocardial cell membrane by binding to it, leading to a decrease in intracellular sodium ion concentration and an increase in calcium ion influx from outside the cell. High concentrations of calcium ions can activate the sarcoplasmic reticulum within myocardial cells to release more calcium ions into the cytoplasm, promoting myocardial contraction.
Anti cancer effect
Digitalis saponins also show certain potential in anti-cancer. Research has found that digitalis saponins can bind to cholesterol molecules in cell membranes, increase cell permeability, and in vitro experiments, increase the accumulation of cisplatin and reduce tumor growth. Although the application of digitalis saponins in anti-cancer is not yet widespread, their unique biological activity provides new directions for future research.
Anti inflammatory and anti exudative effects
Digitalis saponins also have anti-inflammatory and anti exudative effects, which can improve blood circulation and correct brain dysfunction. For diseases such as cerebral edema caused by carbon monoxide, digitalis saponins also show significant protective effects.
Digitonin are an important class of alkaloids in the genus Digitalis, which have various pharmacological effects such as cardiac strengthening, anti-inflammatory, and anticancer effects. The plant extraction method, as the main way to obtain digitalis saponins, has the advantages of low cost and simple operation.
Detailed steps of plant extraction method for digitalis saponins
Material preparation:
Choose fresh and healthy digitalis plants as raw materials to ensure they are not contaminated by diseases, pests, or pesticides.
Prepare the necessary instruments and equipment for the experiment, such as crushers, soaking containers, heating equipment, centrifuges, filters, etc.
Choose appropriate extraction solvents, such as ethanol, methanol, etc., based on the properties and extraction efficiency of the target components.
Plant material crushing:
Clean the digitalis plant material thoroughly to remove impurities and moisture.
Use a crusher to break plant materials into appropriately sized particles for solvent penetration and extraction.
Solvent soaking and extraction:
Put the crushed plant material into a soaking container and add an appropriate amount of extraction solvent.
After sealing the soaking container, heat reflux or soak at room temperature to fully dissolve the active ingredients in the solvent. The parameters such as extraction time, temperature, and solvent dosage need to be optimized according to specific circumstances.
After extraction, centrifuge or filter the soaking solution to separate the filtrate and filter residue.
Filter residue treatment:
Properly treat the filter residue, such as washing with solvents again, to recover any remaining active ingredients.
Combine the washing solution with the initial extraction solution for subsequent processing.
Combined liquid treatment:
Combine the initial extraction solution and washing solution to obtain the combined solution.
As needed, concentrate, decolorize, and remove impurities from the merged solution to improve the purity of digitalis saponins.
Crystallization and Refining:
By methods such as evaporation and crystallization, the digitalis saponins in the combined solution are gradually precipitated.
Wash and dry the precipitated crystals to obtain crude digitalis saponins.
Refine the crude product by using methods such as chromatography and recrystallization to further improve the purity and quality of digitalis saponins.
Finished product inspection and packaging:
Conduct quality testing and purity determination on the refined digitalis saponins to ensure they meet relevant standards and requirements.
Package and store qualified digitalis saponins for future research and application.
The plant extraction method of digitalis saponins is a complex and precise process that requires strict control of operating conditions and parameters in each step. Through the introduction of this article, we can clearly understand the detailed steps and key technical points of the plant extraction method for digitalis saponins. This provides important references and insights for related research and applications. At the same time, we also need to note that in practical operation, flexible adjustments and optimizations need to be made according to specific situations to obtain higher quality and purity of digitalis saponins.
Clinical application of digitalis saponins
Treating heart failure
Digitalis saponins are one of the commonly used drugs for treating heart failure. It enhances myocardial contractility, improves cardiac output, reduces congestion symptoms, and thus alleviates symptoms such as breathing difficulties and edema in patients with heart failure. In clinical practice, digitalis saponins are commonly used to treat congestive heart failure and certain arrhythmias.
Adjuvant therapy for other diseases
In addition to treating heart failure, digitalis saponins can also be used in combination with other drugs to treat diseases such as pulmonary tuberculosis and mycosis. Its anti-inflammatory and anti exudative effects help improve the condition and enhance treatment effectiveness.
Research application
As a natural detergent, digitalis saponins can be used for studying cell membrane permeability. In addition, its unique biological activity and pharmacological effects also provide new ideas and methods for drug research and development.
Toxicity and precautions of digitalis saponins
Toxicity
Although digitalis saponins have significant pharmacological effects, their toxicity cannot be ignored. The adverse reactions of digitalis saponins include local pain and swelling at the injection site, and occasional allergic reactions. Severe arrhythmias such as bradycardia and ventricular tachycardia may also occur. Therefore, when using digitalis saponins, it is necessary to strictly control the dosage and usage to avoid excessive use leading to poisoning.
Attention
When using digitalis saponins, the following points should be noted: Firstly, the dosage and usage should be strictly controlled to avoid excessive use; Secondly, for patients with renal insufficiency, electrolyte disorders, etc., caution or prohibition should be exercised; Finally, it is necessary to regularly monitor electrocardiogram and blood biochemical indicators during use in order to detect and handle adverse reactions in a timely manner.
A type of steroidal saponin that, when hydrolyzed, generates a Digitonin moiety as the aglycone moiety, while the sugar moiety consists of 2 molecules of D-glucose, 2 molecules of half lactose, and 1 molecule of xylose. These sugars are bound to the hydroxyl group of the third carbon atom of the digitalis saponin ligand. Because it can form digitonides, a molecular compound that is insoluble in water, in an equal proportion to steroids with free 3 β - OH (such as cholesterol), this characteristic is utilized for the qualitative and separation of sterols.
The history of using Digitalis can be traced back to BC. The Celts and ancient Romans may have known about the toxicity of this plant and may have used it for hunting poison arrows. The earliest written records appeared in the Welsh medical classic Physicians of Myddvai around 1250 A.D., describing the use of Radix Rehmanniae extract for the treatment of edema (known as "dropsy" at that time, but now it is known that it is the retention of body fluid caused by heart failure). In medieval Europe, digitalis was used by folk doctors to treat various diseases, but its use was not widespread due to its narrow therapeutic window (therapeutic dose close to toxic dose). At that time, people had already noticed:
- Low doses can diuretic and relieve edema
- Excessive use can lead to nausea, vomiting, visual abnormalities (yellow vision), and even death
British physician William Withering (1741-1799) is considered the first person to introduce digitalis into scientific medicine. In 1775, he met a folk doctor in Shropshire who successfully treated edema using a secret herbal formula. After 10 years of systematic research, Withering published the landmark work "An Account of the Foxglove and Some of its Medical Uses" in 1785, in which:
- Detailed description of the botanical characteristics of Digitalis purpurea (purple flowered digitalis)
- 156 cases were recorded, and their therapeutic effect on "dropsy" (mainly edema caused by heart failure) was established
- Standardized preparation methods and dosage guidelines have been proposed, emphasizing the need for precise control of dosage
Withering's work made digitalis a recognized drug in the late 18th century European medical community, despite the lack of knowledge about its active ingredients and mechanism of action at that time.
Safety and Handling
Given its potential toxicity, Digitonin should be handled with care in the laboratory. Personal protective equipment such as gloves, lab coats, and safety goggles should be worn when working with Digitonin solutions. The compound should be stored at 4°C in a cool, dry place, and solutions should be prepared fresh or stored under nitrogen to prevent degradation.
In case of accidental exposure, immediate rinsing with water and seeking medical attention is recommended. Digitonin is classified as a hazardous substance, and proper disposal procedures should be followed according to local regulations.
Digitonin, a steroidal saponin derived from Digitalis purpurea, is a versatile compound with diverse biological applications. Its ability to interact with cholesterol, permeabilize cell membranes, and solubilize membrane proteins makes it an invaluable tool in cell biology, biochemistry, pharmacology, and structural biology. Despite its potential toxicity, careful handling and optimization of experimental conditions allow researchers to harness Digitonin's unique properties for scientific discovery. As research continues to uncover new applications for Digitonin, its importance in the scientific community is likely to grow, further solidifying its position as a cornerstone of modern biological research.
Frequently Asked Questions
Is digitonin a glycoside?
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A glycoside obtained from Digitalis purpurea; the aglycone is digitogenin which is bound to five sugars. Digitonin solubilizes lipids, especially in membranes and is used as a tool in cellular biochemistry, and reagent for precipitating cholesterol. It has no cardiac effects.
What is the composition of digitonin?
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Digitonin is a steroidal saponin (saraponin) obtained from the foxglove plant Digitalis purpurea. Its aglycone is digitogenin, a spirostan steroid. It has been investigated as a detergent, as it effectively water-solubilizes lipids.
How to dissolve digitonin in water?
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This product is well designed to be dissolved in water without precipitating. This product was dissolved easily with water at 100 mg/ml without heating, and no precipitation was observed even after leaving for a week at 4°C, while the previous product needed time and heating, and precipitation appeared.
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