Beyond a Solubilizer: 5 Key Applications of Vitamin E TPGS in Drug Delivery

What are Vitamin E TPGS?

It is a water-soluble derivative of vitamin E, formed by the reaction between the carboxyl group of vitamin E TPGS and the hydroxyl group of polyethylene glycol. Because it contains both the lipophilic group of vitamin E and the long hydrophilic chain of polyethylene glycol, it has good surfactant properties and water solubility, and can significantly increase the absorption of poorly soluble drugs in the gastrointestinal tract. Improve bioavailability. In recent years, many studies have found that in addition to being used as pharmaceutical excipients, TPGS also has many unique properties, such as being an absorption enhancer and a multidrug resistance reversal agent. TPGS can also be used in prodrugs, micelles, lipids, etc. Plasmids and TPGS-copolymer carriers are used to improve the solubility, permeability and stability of the preparation, thereby achieving slow, controlled release and targeted effects, and promoting drug absorption.

Synthesis:

Weigh 5.6 grams of natural vitamin E succinate with a purity of 90%, 20 grams of polyethylene glycol 600 with a molecular weight of 600, and 0.8 grams of concentrated sulfuric acid with a mass concentration of 98%, put them into a three-necked bottle, and place them at 100 The reaction was stirred at constant temperature for 2 hours at ℃, and then cooled to room temperature after the reaction was completed. Transfer the reaction product to a round-bottomed flask, then add 150 ml of ethyl acetate to the round-bottomed flask to obtain a mixture. Transfer the mixture to a separatory funnel, extract three times with saturated brine, and collect the organic phase. The solvent was evaporated from the organic phase to obtain 8.3 grams of TPGS. The purity of the obtained product was 90.1% as measured by HPLC. The conversion rate of vitamin E succinate was 89.2%, and the yield of TPGS was 79.2%.

Application:

1. Application in drug delivery systems

It is a multi-purpose drug delivery excipient that is widely used in poorly soluble/fat-soluble drug delivery systems. Its main functions include: increasing drug solubility: by forming a complex with hydrophobic drugs, it improves the solubility of drugs in water, making it Easier to be absorbed by the body, improving bioavailability.

Protect drugs from enzymatic degradation: Form a protective film on the surface of the drug to prevent enzymatic degradation of the drug in the body, extend the drug's action time, and improve its efficacy.

Adjust drug release rate: By adjusting the prescription amount of TPGS, slow release or rapid release can be achieved.

Improve the stability of drugs: It has antioxidant effects, protects drugs from oxidative damage, and reduces interactions between drugs and other substances, reducing decomposition and degradation.

Improve the pharmacokinetic properties of the drug: Improve the oral absorption of the drug and reduce plasma concentration fluctuations, thereby improving the pharmacokinetic properties of the drug.

Reduce drug side effects: Can reduce drug toxicity and side effects.

2. Application in nutritional supplements

Used as a potent source of natural vitamin E for therapeutic and nutritional purposes. Its water-soluble characteristics allow it to transport vitamin E into small intestinal cells without the intervention of cholates, improving absorption efficiency.

3. Application in cosmetics

Antioxidant performance: It has strong antioxidant ability, which can effectively prevent the oxidation and deterioration of oils and other ingredients in cosmetics and extend the shelf life of the product.

Anti-aging: As an antioxidant, it can help reduce the production of free radicals and slow down the skin aging process, making the skin look younger and healthier.

Emulsification: As an emulsifier, it can help water and oil phases mix to form a stable emulsification system. This property makes it very useful in making cosmetics such as lotions and creams.

Hypoallergenic: Compared to traditional emulsifiers, it is hypoallergenic and non-irritating, making it suitable for sensitive skin.

Improve bioavailability: It can increase the solubility and absorption rate of poorly soluble active ingredients, making them more easily absorbed by the skin, thus improving the efficacy of the product.

Topical application: In topically applied products such as creams and lotions, it can help vitamin E and other active ingredients penetrate better into the skin and exert their moisturizing, repairing and protective effects.

Formula stability: It can be used as a stabilizer in the formula to help maintain the physical and chemical stability of the product and prevent delamination and deterioration.

Oil-in-water emulsifier: can be used to prepare oil-in-water emulsifier to give the product a better texture and usage experience.

4. Special purpose products

Eye drops and nasal sprays: Can be used to prepare eye drops and nasal sprays to help the active ingredients dissolve and absorb better.

Syrups and other formulations: It can be used as an important auxiliary ingredient in some formulations that require high solubility and stability.

Summarize

Due to its excellent water solubility, antioxidant, emulsifying, enhanced absorption and stabilizing properties. It has become an important ingredient in many drug delivery excipients and high-end cosmetic formulas, which can significantly improve product effects and user experience.