By Joint FAO WHO Expert Committee on Food Additives
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Extra info for Combined Compendium of Food Additive Specification
Any excess pressure is released as necessary. For large chambers equilibration overnight may be necessary. A volume of the mobile phase in excess of the volume required for complete development of the chromatogram is saturated with the immobile phase. After equilibration of the chamber, the prepared mobile solvent is introduced into the trough through the inlet. The inlet is closed, and the mobile phase is allowed to travel down the paper the desired distance. Precautions must be taken against allowing the solvent to run down the sheet when opening 7 the chamber and removing the chromatogram.
Temperatures Unless otherwise specified, temperatures are expressed in degrees Celsius, and all measurements are to be made at 20°. Ordinary procedures not involving precise instrumental measurements may be conducted at ambient temperature (approximately 15°-30°) unless a particular temperature is specified in a test or assay. Turbidity The terms "clear", "almost clear", "very slightly turbid", and "turbid", as specified in Purity Tests for "Clarity and colour of solution", are defined in the individual monographs.
1). A number of JECFA and other national experts accepted to draft revisions and updates for selected chapters and other sections of FNP 5. The experts and the chapters or sections that they were requested to revise were as follows: Dr. Madduri V. Rao (UAE University, United Arab Emirates) General Analytical Techniques Inorganic Components Phosphates Sweeteners Mrs. Inge Meyland (Danish Institute of Food and Veterinary Research, Denmark) Appearance and Physical Properties Organic Components Polyols Drs.