Tincture, defined

Herbal preparations are defined as preparations obtained by subjecting herbal substances to treatments such as extraction, distillation, expression, fractionation, purification, concentration or fermentation. These include comminuted or powdered herbal substances, tinctures, extracts, essential oils, expressed juices and processed exudates. 

The term valence, of which ambivalence is not merely a variation, but a decidedly new and separate concept, derives from chemistry and atomic physics. Valence can refer to an extract or tincture, usually from an herb. In this connotation, it has obvious ties with the field of medical alchemy, or iatrochemistry. In the mid-i8oos, valence theory began to be used to signify the normal number of bonds that a given atom can form with other atoms—a register that links valence with philosophical materialism, matter, and Epicurianism. In recent scientific work, valence refers specifically to the number of electrons in the outermost shell of atoms. It is not provisional or occasional in its relation to the atom. Valence is atomicity. It defines a given chemical element, perhaps not in its essence, but in its capacity to combine with other elements—its potentiality. Valence is denoted by a simple number, and elements are said to be monovalent, bivalent, trivalent, quadrivalent, and so on. About one-fifth of all elements have a fixed valence (sodium is always i, or monovalent calcium is always 2, or bivalent and so on). Many elements have valences that are variable, depending on the other elements with which they are combined. 

Herbs are specifically defined as non-woody, low-growing plants such as basil and parsley. Herbal medicine is considered to be the use of crude drugs of plant origin to treat illness or to promote health. A more correct term for this would be botanical medicine. Phytomedicinals are those common preparations, including capsules, tablets, tinctures, and fluidextracts that have been prepared from plant sources. This should be distinguished from plant-derived drugs that have been isolated, purified, and standardized from plant sources. 

Plant preparations Comminuted or powdered plant material, extracts, tinctures, fatty or essential oils, resins, gums, balsams, expressed juices, and so on, prepared from plant material, and preparations whose production involves a fractionation, purification or concentration process, but excluding chemically defined isolated constituents. A plant preparation can be regarded as the active ingredient whether or not the constituents having therapeutic activities are known. 

The oxidation of tincture of guaiac by hydrogen peroxide to give a blue color is one of the most sensitive tests for the presence of peroxidase. This reaction was discovered in 1855. In subsequent years the distinctive nature of the enzyme was established and preparations were purified on the basis of oxidation of polyphenols. The assay most commonly used determines the Purpurogallinzahl (PZ), or purpurogallin number. This assay involves incubation of the enzyme under arbitrarily defined conditions with pyrogallol and H2O2 (I). At a specified time the reaction is... 

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