The infusion is a liquid preparation obtained by pouring boiling water on the vegetable source from which the water-soluble component is to be extracted. Among all the extraction techniques, the infusion is undoubtedly the most practical and common, thanks to the large availability of water and the simplicity of preparation.
Once prepared, the "infusion" must be consumed within a short time, especially when it is obtained from fresh drugs. Any storage can be done in the refrigerator, without however exceeding 24 hours.
How to prepare an infusion
To prepare an infusion you must first concentrate on the drug, which must be reduced to powder or small pieces to facilitate the intimate penetration of the solvent. Water previously brought to the boil is then poured onto the vegetable source, we proceed with a rapid stirring and we let it rest for 5 to 20 minutes depending on the drug. When preparing an infusion it is very important to use a clean container, made of inert material (generally glass or terracotta, not aluminum) and equipped with a lid (to avoid the loss of the most volatile substances). At the end of maceration, generally continued until the drink has cooled, the infusion is eventually filtered and promptly served.
The weight / weight ratio between the drug being infused and the volume of water normally varies from 1:25 to 1: 5 (from 4 to 20 grams for every 100 parts of water).
For the preparation of a therapeutic infusion it is very important to know the quantity of drug, that of water and the specific infusion time. In this sense we can distinguish two different types of infusions: the aromatic one - characterized by an infusion time varying from 5 to 10 minutes, useful for appreciating the aromatic properties of the drug - and that of therapeutic infusions, in which the infusion times are longer. . In any case, due to the dilution of the active ingredients, the dosage difficulties and the poor solubilization of some non-polar substances, the infusion finds space especially in the home, while in the phytotherapeutic one it is preferred in many cases to use different preparative methods or to resort directly with titrated extracts.
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