GENERAL CHAPTERS Archives - pharm_material

Powder Fineness

Admin — Sat, 24 Sep 2022 06:38:52 +0000

Powders The degree of coarseness or fineness of a powder is diffentiated and expressed by reference to the nominal mesh aperture size of the sieves used. The following terms are used in the description of powders: COARSE POWDER A powder […]

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Materials for Chromatography

Admin — Sat, 24 Sep 2022 05:17:32 +0000

Gas Chromatography SUPPORTS Diatomaceous Support (Diatomaceous Earth; Siliceous Earth) White or almost white, fine granular powder made up of siliceous frustules of fossil diatoms or debris of fossil diatioms. It may be identified by microscopic examination with a magnification of x500.(Note Use a suitable grade available such as Celite 545.) Diatomaceous Support, Acid-washed Diatomaceous support that has […]

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Test Solutions in Thai Herbal Pharmacopoeia

Admin — Sat, 24 Sep 2022 04:44:44 +0000

Acetic Anhydride-Sulfuric Acid TS A mixture of 9 volumes of acetic anhydride and 1 volume of sulfuric acid. Ammonia TS It contains 9.5 to 10.5 per cent w/w of NH3. Prepare by diluting 400 mL of strong ammonia solution with water to make 1000 mL. Store at a temperature not exceeding 20°. Ammonium Molybdate TS A 10.0 per cent w/v solution of ammonium molybdate. […]

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pH indicators of Thai Herbal Pharmacopoeia

Admin — Sat, 24 Sep 2022 04:20:33 +0000

Methyl Red C15H16ClN3O2 = 305.76 Dark red powder or violet crystals. Sparingly soluble in water; soluble in ethanol. Transition interval: from pH 4.2 to 6.3. Colour change: from red to yellow. Methyl Red TS Dissolve 10 mg of methyl red in 100 mL of ethanol, and filter if necessary. Phenolphthalein C20H14O4 = 318.33 White or faintly yellowish white, crystalline powder. Insoluble in water; soluble […]

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Volumetric solution in Thai Herbal Pharmacopoeia

Admin — Thu, 22 Sep 2022 17:06:02 +0000

In this Pharmacopoeia, all concentrations of volumetric solutions are expressed in terms of molarity. The molarity of a solution is stated as the number of moles of substance contained in 1000 mL of the solution. A solution which contains x moles of substance per 1000 mL is designated as x molar (x M). […]

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REAGENTS use in Thai Herbal Pharmacopoeia

Admin — Tue, 20 Sep 2022 17:20:00 +0000

the specifications given below are strictly for the use of the materials as reagents. The inclusion of a material in this Appendix does not imply that it is suitable for use in medicines. Exceptionally, a trademark or supplier may be indicated for certain reagents whose availability is limited. It is however acceptable to use reagents […]

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