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3-O-Ethyl-L-ascorbic Acid, also known as ascorbic acid ethyl ether, is a derivative of vitamin C. It is a colorless or light yellow transparent liquid with a unique odor, molecular formula C8H12O6, CAS 86404-04-8. This odor is relatively light and does not bring strong stimulation to users. Due to its colorless and transparent properties, it can easily blend into various skincare products without changing the original color and texture of the product. This compound is widely used in cosmetics and personal care products due to its excellent stability and skin penetration. Compared to unmodified vitamin C, vitamin C ethyl ether has higher stability. It can remain stable under conditions of light, high temperature, and the presence of oxygen, and is not easily oxidized. This characteristic prolongs the shelf life of vitamin C ethyl ether in skincare products, while also ensuring its effectiveness during use. It has good skin permeability and can penetrate deep into the surface of the skin, exerting its antioxidant and whitening effects. This permeability allows the vitamin C ethyl ether in skincare products to be better absorbed and utilized by the skin, thereby improving the efficacy of the product. It is not only very stable in chemical substances and a non discoloring derivative of vitamin C, but also a lipophilic, hydrophilic, and amphoteric substance, which greatly expands its application scope, especially in daily chemistry. 3-ethylascorbic acid ether can easily penetrate the stratum corneum and enter the dermis. After entering the body, it is easily broken down by biological enzymes, thereby exerting the biological effects of vitamin C. After entering the dermis, VC ether directly participates in the synthesis of collagen and repairs the activity of collagen. Skin cells increase collagen, making the skin full and elastic, making the skin delicate and smooth.
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Chemical Formula |
C8H12O6 |
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Exact Mass |
204 |
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Molecular Weight |
204 |
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m/z |
204 (100.0%), 205 (8.7%), 206 (1.2%) |
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Elemental Analysis |
C, 47.06; H, 5.92; O, 47.01 |
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3-o-ethyl ascorbic acid ether is also called vitamin C ethyl ether. Because vitamin C has 4 hydroxyl groups in its structure, it can not be directly absorbed by the skin, and it is easy to be oxidized to cause discoloration. As a whitening agent, its use in cosmetics is limited. The vitamin C ethyl ether prepared by chemicalbook after 3-hydroxy alkylation is a vitamin C derivative that does not change color and does not affect its biological activity, thus filling the blank of similar products in the market. Studies have shown that vitamin C ethyl ether is easy to be decomposed by enzymes after entering the skin to play the role of vitamin C.
Synthetic 3-o-ethyl-l-ascorbic acid: a one-step method for the preparation of 3-o-alkyl ascorbic acid ether from vitamin C. The method comprises the following steps:
Vitamin C, alkali and alkylating reagent react in solvent to synthesize 3-o-alkyl ascorbic acid ether;
At the end of the reaction, the reaction solvent is recovered, the residue is diluted with water, ion exchanged on a strong alkaline anion exchange resin column, washed with water until the pH of the effluent is ≤ 8;
The effluent containing 3-o-alkyl ascorbic acid ether is combined with dilute acid washing column, and the elution can be stopped when there is no 3-o-alkyl ascorbic acid ether in the effluent;
After elution, the eluent was concentrated and crystallized under reduced pressure to obtain purified 3-o-alkyl ascorbic acid ether.
The invention adopts the separation method of ion exchange, avoids the use of a large number of flammable and explosive organic solvents, has high safety, good purification and separation effect and saves cost.
The national supply and Marketing Cooperative Nanjing Institute of comprehensive utilization of wild plants developed VC ethyl ether and obtained the national patent.
3-O-Ethyl-L-Ascorbic Acid (EA) is a stable derivative of vitamin C (L-ascorbic acid), with its core structure being the introduction of an ethyl group on the third carbon atom of vitamin C. This structural modification significantly enhances its chemical stability:
Antioxidant stability
Traditional vitamin C is prone to deactivation due to oxidation, especially rapidly degrading in light, high temperature, or alkaline environments. EA protects the 3-hydroxy group with ethyl groups, reducing oxidative reactivity and allowing it to remain stable in cosmetic formulations for months or even years.
Dual phase solubility
EA has both water solubility and fat solubility, and can penetrate the stratum corneum of the skin into the dermis layer, breaking through the limitations of poor penetration of traditional vitamin C.
Biological conversion efficiency
EA is enzymatically hydrolyzed into pure vitamin C in the skin, with a conversion rate of over 80%, ensuring efficient release of active ingredients.
These characteristics make it an ideal choice to replace traditional vitamin C in the cosmetics and pharmaceutical fields.
Core uses in the cosmetics industry
Whitening and brightening skin tone
Inhibition of Tyrosinase Activity: Tyrosinase is a key enzyme in melanin synthesis, and EA competitively inhibits its activity to reduce melanin production. The experiment shows that the essence containing EA can reduce the content of melanin by 23% -35%, which is better than arbutin and kojic acid.
Clinical case: In a double-blind trial for 30 patients with chloasma, after 8 weeks of continuous use of 2% EA essence, the stain area decreased by 41% and the skin color uniformity increased by 52%.
Blocking melanin transport: EA can inhibit the transfer of melanosomes to keratinocytes, reducing pigment deposition from the source.
Accelerating metabolism to generate pigments: promoting the renewal of the stratum corneum, accelerating the shedding of melanocytes, achieving a dual effect of "surface brightening+deep blackening suppression".
Anti aging and skin repair
Collagen synthesis stimulation: EA promotes the synthesis of collagen precursor (procollagen) by activating prolyl hydroxylase. Experiments have shown that 1% EA can increase collagen production in fibroblasts by 68% and significantly improve skin elasticity.
Clinical data: 40 female volunteers used EA containing face cream continuously for 12 weeks, the skin tightness increased by 31%, and the depth of wrinkles decreased by 27%.
Antioxidant defense enhancement: EA directly neutralizes free radicals (such as superoxide anions and hydroxyl radicals), reducing oxidative stress damage to skin cells. Its antioxidant capacity is 1.5 times that of vitamin C, and it is stable within the pH range of 4-6.
Collaborative protection: When combined with components such as vitamin E and ferulic acid, EA can regenerate oxidized vitamin E, forming an antioxidant cycle and prolonging the protective effect.
Light damage repair: EA can inhibit the expression of matrix metalloproteinases (MMP-1) induced by ultraviolet radiation, reduce collagen degradation, and promote the expression of DNA damage repair enzymes, accelerating the repair of photoaging skin.
Skin barrier enhancement
Lipid synthesis promotion: EA upregulates the expression of ceramide synthase (SMS), increases skin lipid content, and strengthens the barrier function of the stratum corneum.
Anti inflammatory and Soothing: Inhibits the release of inflammatory factors (such as IL-6 and TNF - α), relieves redness, swelling, and stinging symptoms of sensitive muscles.
Stability improvement: EA does not need to be stored away from light in the formula and can withstand high temperature sterilization, simplifying the production process.
Wide compatibility: can be compounded with ingredients such as nicotinamide, retinol, peptides, etc., without antagonistic effects, enhancing the overall efficacy of the product.
Formulation flexibility: It is suitable for essence, face cream, facial mask, sunscreen and other formulations, and can play a significant role in low concentration (0.5% -5%).
adverse reaction
3-O-Ethyl-L-Ascorbic Acid ( also known as VC ethyl ether) is a stable vitamin C derivative widely used in the fields of cosmetics and skincare. It protects the 3-OH group from ionization by introducing an ethyl group on the third carbon atom of vitamin C, thereby enhancing the molecule's resistance to oxidation, making it more stable at room temperature and less prone to discoloration. This structural modification not only retains the whitening, antioxidant and other biological activities of vitamin C, but also improves its skin permeability and bioavailability. However, despite its overall high safety, it may still cause adverse reactions under specific conditions.
Skin irritation risk
Mild irritation symptoms
For some individuals with extremely sensitive skin, 3-O-Ethyl-L-Ascorbic Acid may cause mild skin discomfort. This discomfort usually manifests as brief stabbing pain, redness, and other symptoms. For example, some consumers may feel a slight stinging sensation in the application area after using skincare products containing this ingredient, but this stinging sensation often disappears in a short period of time; It is also possible to experience skin redness, but the degree of redness is generally mild and does not last for too long.
Reason for occurrence
The occurrence of such reactions is closely related to the individual's skin tolerance. Different people have different skin structures and physiological functions, and their sensitivity to chemicals also varies. Some people have relatively weaker skin barrier function and more sensitive nerve endings. When exposed to 3-O-Ethyl-L-Ascorbic Acid, they are more likely to produce a stimulating response. Moreover, this reaction is usually rare and mild, and most people do not experience obvious skin irritation symptoms under normal use.
Allergic reactions
Allergic symptoms
In theory, there is a possibility of allergies after exposure to 3-O-Ethyl-L-ascorbic acid. The symptoms of allergic reactions may include rash, itching, etc. A rash may manifest as small red bumps or patches on the skin, varying in shape and size, and may be accompanied by itching. In severe cases, it can even affect the patient's sleep and daily life. Itching symptoms may cause patients to unconsciously scratch their skin, leading to skin damage and increasing the risk of infection.
Allergy mechanism
The occurrence of allergic reactions is due to an individual's immune system overreacting to 3-O-Ethyl-L-Ascorbic Acid. When the ingredient enters the human body, the immune system recognizes it as a foreign invader and initiates an immune response, producing specific antibodies. When exposed to the ingredient again, the antibody will bind to the antigen, triggering a series of immune reactions and leading to the appearance of allergic symptoms.
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