Starch mucilage

In all these papers certain names of hydrocolloids—gums, starches, mucilages—constantly recur. 

Procedure Shake 10 ml of chloroform with 20 ml of freshly boiled and cooled DW for 3 minutes and allow to separate. To the aqueous layer add 1 ml cadmium iodide soln. and 0.1 ml of 10 ml of starch mucilage. Prescribed Limit No blue colour is produced. 

To a portion of the sample, add 0.5 ml of a 10% solution of potassium iodide and 0.5 ml of dilute hydrochloric acid. Liberation of iodine which turns starch mucilage blue is indicative of niEites. The presence of niEites in blood renders it brown due to die formation of mediaemoglobin. To 1 ml of blood add 2 drops of potassium cyanide solution. An immediate red colour confirms the presence of methaemoglobin. 

Starch mucilage 5-10 Commonly used adhesive insoluble in dry state... 

Starch is also used in topical preparations for example, it is widely used in dusting powders for its absorbency, and is used as a protective covering in ointment formulations applied to the skin. Starch mucilage has also been applied to the skin as an emollient, has formed the base of some enemas, and has been used in the treatment of iodine poisoning. 

If the conclusion drawn is correct, a similar behaviour of other negative hydrophilic sols as to the influence of indifferent salts on the relative viscosity was to be expected. Indeed the electroviscous effect has been found to exist in all cases investigated, viz.t gtim arabic soluble starch mucilage of semen lini and of carrageen, sodium thymus nucleate and sodium yeast nucleate. Pecularities shown by some of these examples will be discussed later p. 223 10 and p. 227 11. 

Figure 2 Crushing strength of wet granulated dicalcium phosphate. Binders , gelatin , potato starch mucilage x, acacia A, povidone and O, PEG 4000. (From Ref. 51.)...

Bandyopadhyay AK, Chaudhuri B, Bhattacharjee PK. Starch paste granulation I effect of dextrinized corn starch mucilage as binding agent on granulation and tablet quality. Aust J Pharm Sci 1980 9(3) 85-89. 

Dissolve about 60 mg, accurately weighed, in water and dilute to 50 ml. Transfer 10 ml to a 250-ml stoppered flask, add 5 ml of N sodium hydroxide and allow to stand for thirty minutes in a water-bath at 30°. Acidify with 5-5 ml of N hydrochloric acid, add 30 ml of 0-02N iodine, close the flask with a stopper moistened with water and allow to stand in a water-bath at 30° for fifteen minutes, protected from light. Titrate the excess of iodine with 0-02N sodium thiosulphate, using starch mucilage, added towards the end of the titration, as indicator. Carry out a blank determination by transferring 10 ml of the penicillin solution to a stoppered flask, adding 30 ml of 0 02N iodine and titrating immediately with 0 02N sodium thiosulphate. The difference between the two titrations represents the amount of iodine that has reacted with the total penicillins present. Each ml of 0 02N iodine is approximately equivalent to 0 764 mg of total penicillin as the sodium salt, or to 0 798 mg as the potassium salt. 

To an amount of sample containing about 0 4 g of iodide in a longnecked flask add sufficient water to bring the volume to about 50 ml. Neutralise with concentrated hydrochloric acid and then add about 15 ml of the acid in excess followed by 6 ml of 10 per cent potassium cyanide solution, maintaining the temperature below 20°. Titrate with 0-05M potassium iodate until the dark brown solution becomes pale yellow, add 5 ml of starch mucilage and continue the titration until the liquid becomes colourless. 

Dissolve about 0-35 g of the sample in 50 ml of water. Add 20 ml of concentrated hydrochloric acid and 50 ml of 0 1 N bromate-bromide solution and, after shaking repeatedly during fifteen minutes and allowing to stand for a further fifteen minutes, dilute the mixture to 200 ml with water. Then add 1 g of potassium iodide and titrate the liberated iodine with 0 1N sodium thiosulphate, starch mucilage being added near the end-point. 1 ml O IN = 0 003629 g C9H7ON. 

After combustion add an excess (5 to 10 ml) of acetic-bromine solution and allow to stand for two minutes. Remove the excess bromine by addition of formic acid (about 0 5 to 1 0 ml), wash down the sides of the flask with water and sweep out any bromine vapours above the liquid with a current of air. Add 1 g of potassium iodide and titrate with 0 02N sodium thiosulphate, using starch mucilage as indicator. 

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