An Experimental Study of Certain Basic Amino Acids
An Experimental Study of Certain Basic Amino Acids
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excess of barium hydroxide to the neutral solution obtained above, warming the suspension on a water bath, and then raising it to the boiling point. After cooling, the histidine silver compound is fil- tered off and washed.
No advantage was found in this method and it seems to afford more chance for decomposition to take place.
(c) The modification recommended by Osborne, Leavenworth and Brautlecht 1 was found to be the most definite. In it the greater portion of the histidine is first removed ...from the above mixture by precipitation with mercuric sulfate. It is then reprecipitated as the silver compound.
The filtrate from the mercury precipitate still contains a small amount of histidine because of the solubility of the mercury histidine compound. This is separated as the silver salt, as described above, under '(a)'. The work was carried out as follows: The solution obtained by decomposing the silver compound of histidine and arginine was concentrated to about 250 cc. , sulfuric acid was added until the solution contained 5 per cent of this acid, and a slight excess of mercuric sulfate solution then added.
What to read after An Experimental Study of Certain Basic Amino Acids?
You can find similar books in the "Read Also" column, or choose other free books by Mary Letitia Caldwell to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
excess of barium hydroxide to the neutral solution obtained above, warming the suspension on a water bath, and then raising it to the boiling point. After cooling, the histidine silver compound is fil- tered off and washed.
No advantage was found in this method and it seems to afford more chance for decomposition to take place.
(c) The modification recommended by Osborne, Leavenworth and Brautlecht 1 was found to be the most definite. In it the greater portion of the histidine is first removed ...from the above mixture by precipitation with mercuric sulfate. It is then reprecipitated as the silver compound.
The filtrate from the mercury precipitate still contains a small amount of histidine because of the solubility of the mercury histidine compound. This is separated as the silver salt, as described above, under '(a)'. The work was carried out as follows: The solution obtained by decomposing the silver compound of histidine and arginine was concentrated to about 250 cc. , sulfuric acid was added until the solution contained 5 per cent of this acid, and a slight excess of mercuric sulfate solution then added.
What to read after An Experimental Study of Certain Basic Amino Acids?
You can find similar books in the "Read Also" column, or choose other free books by Mary Letitia Caldwell to read onlineMoreLess
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