Allpyral: An appraisal.
In Allpyral the alum which has been added to the highly alkaline-pyrididium extract of non-defatted pollen absorbs only 25% of the extracted nitrogenous material, the larger quantity having been discarded with the supernanant.  Allpyral contains a relatively small amount of antigenic material compared with conventional aqueous or glycerol preparations.  Chemical studies show Allpyral to be a product resulting from an unrealized concept and a faulty method of preparation involving injudicious use of alum.
D000485:Allergens / Q000592:standards*; D000534:Alum Compounds; D000941:Antigens / Q000592:standards*; D003888:Desensitization, Immunologic / Q000592:standards*; D010936:Plant Extracts; D011058:Pollen; D011725:Pyridines; D012997:Solvents
D000485:Allergens; D000534:Alum Compounds; D000941:Antigens; D010936:Plant Extracts; D011725:Pyridines; D012997:Solvents