The book Introduction to the Chemistry of Plant Products was written by author Paul Haas Here you can read free online of Introduction to the Chemistry of Plant Products book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Introduction to the Chemistry of Plant Products a good or bad book?
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The precipitates are washed * Hanson : " New Phytologist, " 1909, 8, 337. T See Section viii, on Colloids. 250 PIGMENTS by decantation with 70 per cent alcohol ; the pigment, in a pasty mass, is placed in a clock glass and dried in a vacuum. Reactions. The following reactions are among those recorded by Hanson : — 1. Phycoerythrin is precipitated from its solution by alcohol, by small quantities of mercuric chloride, and by saturation with ammonium sulphate and magnesium sulphate. 2. When dilut...e acids are added gradually, the fluorescence first disappears, leaving a somewhat opalescent solution of a lilac-pink tint. After the lapse of two days a pink precipitate comes down. 3. Ammonium hydrate in small quantities removes the fluorescence ; in excess, a yellowish-brown coloration results. 4. Caustic soda or potash in small quantities causes the red colour to disappear, the solution turning opalescent and yellowish-brown in colour ; on standing, a brownish precipitate comes down. 5. The solution is immediately decolorized by bleaching powder, bromine water or a solution of iodine in potassium iodide.
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