Fat Associated With Starch
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That the fat in the residue might be occluded in the residue, is very improbable on account of the method em- ployed in precipitation of the residue by alcohol and ether, both of which are good fat solvents. The argument that the residue material was so insoluble as to prevent the solvents from coming into contact with the fat and hence the latter being retained, although free, in the residue, can have very little justification in the light of the following experiment.
Two g. Of residue No. 90 ...was refluxed for one hour with 20 cc. Of o. I M alkali. This treatment gave a slightly opalescent liquid similar in ap- pearance to colloidal starch. On pouring the liquid into an excess of alcohol a precipitate was formed which gave a blue color with acid iodine solution, indicating unchanged starch. The precipitate was filtered, dried and extracted with boiling alcohol and ether, and upon analysis showed 1. 9% of "fat by hydrolysis" with an acid number of 175. 7.
By this alkali treatment the residue was brought into solution again, and if the fat had been free fatty acid it would have been removed com- pletely, yet the results showed that only 1.
What to read after Fat Associated With Starch?
You can find similar books in the "Read Also" column, or choose other free books by T Clinton Theodore Clinton Taylor to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
That the fat in the residue might be occluded in the residue, is very improbable on account of the method em- ployed in precipitation of the residue by alcohol and ether, both of which are good fat solvents. The argument that the residue material was so insoluble as to prevent the solvents from coming into contact with the fat and hence the latter being retained, although free, in the residue, can have very little justification in the light of the following experiment.
Two g. Of residue No. 90 ...was refluxed for one hour with 20 cc. Of o. I M alkali. This treatment gave a slightly opalescent liquid similar in ap- pearance to colloidal starch. On pouring the liquid into an excess of alcohol a precipitate was formed which gave a blue color with acid iodine solution, indicating unchanged starch. The precipitate was filtered, dried and extracted with boiling alcohol and ether, and upon analysis showed 1. 9% of "fat by hydrolysis" with an acid number of 175. 7.
By this alkali treatment the residue was brought into solution again, and if the fat had been free fatty acid it would have been removed com- pletely, yet the results showed that only 1.
What to read after Fat Associated With Starch?
You can find similar books in the "Read Also" column, or choose other free books by T Clinton Theodore Clinton Taylor to read onlineMoreLess
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