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Open Source Apothecary At Home / Preparations
Water is what makes an infused oil go rancid, so the drying of the plant before it goes in the oil is the whole method.
methodAn infused oil carries the lipophilic fraction of a plant: fixed oils, waxes, resins, fat-soluble vitamins, and the more non-polar terpenes. It does not carry tannins, mucilage, sugars, mineral salts, or most glycosides. That single fact decides which plants are worth infusing — calendula, comfrey leaf, plantain, chickweed, St John's wort flower, rosemary, lavender, and the resinous conifers and buds all have a meaningful oil-soluble fraction; a tannin plant such as oak bark has almost none.
Water is the enemy, and this is the method's one hard rule. Fresh plant material is 70-85% water. Water in a sealed jar of oil is the interface where hydrolysis and microbial growth happen, and it is the reason home-infused oils go rancid or grow a film within weeks while a properly dried infusion lasts a year or more. Wilt or dry the plant until it is genuinely dry — floppy to limp to crisp — before it goes into the oil. If there is any doubt, do a quick dry: a fresh plant in oil should be watched daily and strained at the first sign of cloudiness or smell change.
Two methods, and when each is right:
Which oil. A stable, relatively flavourless carrier is better than a delicate one. Olive oil is traditional and stable; sunflower and sweet almond are common; coconut oil is excellent for wound and skin preparations because of its saturated fat content and its low oxidation rate, and it is solid below about 24 C, which changes the texture of the finished product. Avoid flax and other polyunsaturated seed oils for infused preparations — they oxidise fastest and turn rancid quickest.
Oxidation is the failure mode to design against. Heat, light, oxygen and trace metals all accelerate it; the visible signs are a smell like old nuts or crayons and a tacky texture. Keep the finished oil in amber or dark glass, filled to the top to minimise headspace, cool and dark, and mark the date. A year is a fair working life for a home infused oil; six months if it was made with any fresh material.
Salves are an infused oil thickened with beeswax. The proportion of wax sets the consistency and it is measured by weight, not by eye: about 20 g of beeswax to 100 mL of oil gives a firm salve, about 10-12 g gives a soft one. Add the wax to the warm oil and stir until dissolved, then pour while hot, because it sets fast. A salve is a semi-solid vehicle: it stays where it is put, it is occlusive enough to reduce water loss from skin, and it carries the oil-soluble fraction of whatever was infused. It is not sterile, and it is not for a deep or dirty wound.
Betanin increases the overall stability of the W/O/W emulsion, reduce the oil droplet size and improve size distribution when compared to the negative control without pigment and to emulsions containing betanin from other sources.PubMed 29803475 ↗
Finally, the review addresses key technological, economic, and regulatory challenges related to industrial implementation and highlights future opportunities for integrating these extraction strategies into circular bioeconomy models.PubMed 42449430 ↗
The relationship between these pathways allows a better understanding how garlic and its derivates could be carrying out its pharmacological action over the management of acute and chronic pain and provide a base by further investigations.PubMed 35263014 ↗
Furthermore, the last part reflects on fraud in olive oil, and the most popular analytical techniques in the authenticity field are stated to highlight the importance of the authenticity of olive oil.PubMed 36139019 ↗
Finally, some commercial plant extracts for milk preservation were discussed.PubMed 32156345 ↗
Infused oil — warm method (the reliable one)
1. Dry the plant first. Wilt or dry until limp-to-crisp; a fully dry leaf crumbles. Fresh material in oil is the commonest cause of a spoiled batch. 2. Fill a clean dry jar loosely with the dried plant — do not pack it. 3. Cover with carrier oil by at least 2-3 cm; the plant must stay submerged to exclude air. 4. Warm gently: 40-60 C for 2-4 hours (double boiler, oven on its lowest setting with the door ajar, or a yogurt maker). Do not exceed 60 C. 5. Cool, then strain through muslin and press the marc. 6. Let it stand 24 hours and decant off any water or sediment that settles. 7. Bottle in dark glass, filled high, labelled with plant, part, oil, and date.
Infused oil — cold method
Same as above, but steep 2-6 weeks at room temperature, shaking daily, in a dark place. Strain at the first sign of cloudiness, off-smell, or a film.
Salve
Oil infusion with essential oil added (for scent or action)
Add the essential oil to the cooled oil, at a final dilution of 2-3%, immediately before jarring. Adding it hot drives off the volatiles you just paid for. 2% is about 12 drops per 30 mL.