D-Salicin, also known as salicin, is a naturally occurring compound primarily found in the bark of white willow trees (Salix alba). It belongs to a class of compounds known as phenolics and more specifically, as salicylates. This compound has been of significant interest due to its structural similarity to aspirin, which is a synthetic derivative of salicylic acid.
Historically, it has been used in traditional medicine to alleviate pain, reduce inflammation, and treat fever. Its mode of action is believed to involve inhibiting the production of prostaglandins, which are hormones that contribute to inflammation and pain. However, unlike aspirin, it is not directly used in modern pharmacological preparations due to its slower absorption and metabolism.
Research has continued, exploring its potential benefits in various therapeutic areas, including as an anti-inflammatory agent, an analgesic (pain reliever), and even in the management of certain chronic conditions. Studies suggest that it may offer a natural alternative to synthetic drugs, with a comparably milder side effect profile.
Despite its promising properties, the use in medical treatments is still relatively limited and often requires further investigation to establish its efficacy and safety, especially in long-term use or in specific patient populations. Nevertheless, its traditional use and ongoing research highlight the potential of this natural compound in modern medicine.
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Chemical Formula |
C13H18O7 |
| Exact Mass | 286.11 |
| Molecular Weight | 286.28 |
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m/z |
286.11 (100.0%), 287.11 (14.1%), 288.11 (1.4%) |
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Elemental Analysis |
C, 54.54; H, 6.34; O, 39.12 |
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Melting Point |
196-202 °C |
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Boiling Point |
388.65°C (rough estimate) |
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Specific Rotation |
-61.5 º (c=5, water) |
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Density |
1.4340 |
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Refractive Index |
-62 ° (C=3, H2O) |
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Storage Conditions |
2-8°C |
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Solubility |
Solubility in water is 36 g/L |
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Form |
White fine crystalline powder |
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Acidity Coefficient (pKa) |
12.80±0.70(Predicted) |
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Water Solubility |
36 g/L (15 ºC), 250 g/L (60 ºC) |
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Stability |
Stable, but sensitive to light. Incompatible with strong oxidizing agents. |
Synthesis of Salicin via Esterification and Glycosidation
- Reaction Setup: Start with salicylic acid and an alcohol (commonly methanol or ethanol) in the presence of an acid catalyst, such as sulfuric acid or hydrochloric acid.
- Reaction Conditions: Heat the mixture to a temperature ranging from reflux to around 100°C, depending on the alcohol used. Maintain this temperature for a few hours to allow the esterification reaction to proceed.
- Isolation of the Ester: Once the reaction is complete, neutralize the acid catalyst using a base like sodium bicarbonate. Extract the ester from the reaction mixture using a suitable solvent. Concentrate and purify the ester by distillation or crystallization.
- Reactant Preparation: Prepare the sugar derivative, typically glucose or galactose, in the form of an activated sugar ester or glycosyl halide. These activated intermediates are more reactive towards nucleophilic substitution reactions.
- Reaction Setup: Combine the ester obtained from the esterification step with the activated sugar derivative in the presence of a catalyst, such as silver oxide or mercury(II) oxide.
- Reaction Conditions: Heat the mixture to a temperature ranging from 60°C to 100°C for several hours to allow the glycosidation reaction to occur. The catalyst promotes the substitution of the ester group with the sugar moiety.
- Isolation of Salicin: After the reaction is complete, quench the reaction mixture with water and extract the product with an organic solvent. Purify salicin by crystallization or column chromatography to obtain the final product.
Medicinal Uses
Treatment of Fever, Cold, and Infections
Referred to as a "natural aspirin" for its ability to treat mild fever, colds, and infections such as influenza. It provides relief from pain and discomfort caused by inflammation.
Relief from Arthritis and Back Pain
An effective source for relieving pain associated with arthritis and lower back pain. It has been shown to improve pain relief for arthritis patients and reduce the symptoms of arthritis over time.
Anti-Inflammatory and Analgesic Effects
It exhibits anti-inflammatory and analgesic properties, making it useful in treating conditions like headaches and other inflammatory pain.
Cosmetic & Skin Care
Exfoliation and Skin Brightening
D-Salicin possesses mild exfoliating properties, which help to gently remove dead skin cells from the surface of the skin. This not only reveals smoother, brighter skin but also allows other skincare ingredients to penetrate deeper into the skin for enhanced efficacy.
Improving Skin Elasticity and Anti-Aging
It is known to have anti-aging effects on the skin. It stimulates the production and maintenance of collagen, a key protein that supports skin elasticity. By increasing collagen levels, salicin can help reduce wrinkles, fine lines, and sagging skin, giving the skin a more youthful appearance.
Treating Skin Conditions
It's anti-inflammatory properties make it an effective treatment for various skin conditions. It can be used to soothe irritated skin, reduce redness, and calm inflammation caused by acne, rosacea, or eczema. Additionally, salicin can also help to improve skin sensitivity and increase the skin's tolerance threshold.
Balancing Skin Tone and Texture
It's ability to exfoliate dead skin cells and stimulate collagen production can help to balance uneven skin tone and texture. By removing dull, lifeless skin cells and promoting cell renewal, salicin can give the skin a more even, radiant complexion.
Incorporation in Cosmetic Products
Included in various skincare products, such as cleansers, toners, serums, moisturizers, and masks. Its mild yet effective nature allows it to be used in a wide range of formulations, making it a versatile ingredient for different skin types and concerns.
Salicylic acid is a naturally occurring beta hydroxy acid (BHA) with a chemical structure of ortho hydroxybenzoic acid and a molecular weight of 138.12.
Keratin regulation: bidirectional effect and precise penetration
1. Dissolve stratum corneum connections
By disrupting the desmosomes between keratinocytes, reducing intercellular adhesion, and promoting the shedding of aging keratinocytes. Its lipophilic properties allow it to penetrate the sebum layer, penetrate deep into the pores, dissolve accumulated keratin plugs (blackheads/whiteheads), and unblock hair follicle ducts. Experiments have shown that after treatment with 2% salicylic acid, the thickness of the stratum corneum is reduced by 15% -20%, and the renewal cycle of keratinocytes is shortened by 30%.
2. Bidirectional regulation mechanism
Low concentration (0.5% -2%): promotes keratinization metabolism, improves incomplete keratinization, suitable for keratosis (chicken skin) and ichthyosis.
Medium concentration (3% -5%): directly dissolves keratin, softens thick calluses and corns, clinically used for the treatment of palmar and plantar keratosis.
High concentration (10% -30%): As a chemical exfoliating agent, it stimulates epidermal reconstruction by disrupting the integrity of the stratum corneum, and is commonly used for acne scars and photoaging repair.
Anti inflammatory and antibacterial: multi-target inhibition of inflammatory cascade reaction
1. Inhibition of prostaglandin synthesis
By blocking the activity of cyclooxygenase (COX-1/COX-2), the production of prostaglandin E2 (PGE2) is reduced, thereby reducing vascular permeability and alleviating redness, swelling, and pain. Its selective inhibition of COX-2 (IC50=0.8 μ M) makes it significantly effective in the treatment of inflammatory acne, reducing the number of inflammatory papules by up to 40%.
2. Broad spectrum antibacterial effect
Propionibacterium acnes: By disrupting the structure of bacterial cell membranes and inhibiting their reproduction, the minimum inhibitory concentration (MIC) is 0.5% -1%.
Malassezia: With an inhibition rate of 85% against the pathogenic bacteria of seborrheic dermatitis, combined with its oil control effect, it can reduce the production of dandruff.
Resistance avoidance: Unlike antibiotics, salicylic acid kills bacteria through physical action and no bacterial resistance phenomenon has been observed.
Oil control and anti seborrhea: regulating sebaceous gland function
By inhibiting the activity of 5 α - reductase, the conversion of testosterone to dihydrotestosterone (DHT) is reduced, thereby lowering sebaceous gland secretion. Clinical trials showed that after 4 weeks of use of 2% salicylic acid gel, facial oil secretion decreased by 28%, and the effect lasted until 2 weeks after drug withdrawal. Its lipophilicity allows it to reside in hair follicles for a long time, continuously exerting its oil control effect.
Whitening and photoprotection: Multi pathway inhibition of pigment deposition
1. Inhibit tyrosinase activity
By competitively binding to the copper ion active center of tyrosinase, melanin synthesis is reduced. The inhibition rate is linearly related to the concentration, with an inhibition rate of 35% at a concentration of 2%.
2. Accelerate keratin metabolism
Promote the shedding of keratinocytes containing melanin and shorten the melanin transport cycle. Combined use of sunscreen can reduce UV induced pigmentation and increase the effectiveness of treating melasma by 25%.
Special dosage forms and delivery systems: enhancing efficacy and reducing irritation
1. Supramolecular Salicylic Acid
By using cyclodextrin inclusion technology, salicylic acid molecules are encapsulated in polysaccharide structures to form a sustained-release system. This technology reduces its irritability by 60% and prolongs its action time to 8 hours, making it suitable for the treatment of sensitive acne.
2. Nano crystalline patch
Using a microneedle array to break through the stratum corneum barrier and deliver salicylic acid directly to the dermis layer. Animal experiments have shown that this technology increases drug penetration by 12 times and has significant therapeutic effects on deep cystic acne.
faq
What is salicin used for?
Willow bark is commonly used to treat pain and reduce fevers. It contains a compound called salicin that has been shown to have anti-inflammatory effects.
Are salicin and salicylic acid the same?
In summary, salicin is usually milder and less irritating to the stomach lining because it requires metabolic conversion to exert its effects. Salicylic acid, on the other hand, is an active compound with stronger potency, often used topically for its immediate therapeutic properties.
What's another name for salicylic acid?
Salicylic acid is also known as 2-hydroxybenzoic acid (one of several β-hydroxy acids). It treats acne by causing skin cells to slough off more readily, preventing pores from clogging up as it is a keratolytic agent. Salicylic acid 1% to 2% preparations are usually well tolerated.
What is the difference between salicin and aspirin?
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