1) Laying emphasis on chemical equation of Jolles's reaction, and systematically examining those causes for mismeasurement happened during urinal determination of indican, I was enabled to find out certain new microestimating method for indican, which would prove somewhat satisfactory.
2) As indicated below, the normal value of urinal indican estimated by new method, have acknowledged certain marvelously high values that have far superseded those theories hitherto known. However, I am to recognize the Principle No. (2) i.e., the quantitative value for indican that was considered to have as its object the colour reaction against the fuming hydrochloric acid, which could purely has enabled to induce it solely into the Thymolindogenide; while, Principle No. (1), i.e., the quantitative value which has for its object the original color of Thymolindogenide, should be recognized as total Indican value, i.e., that was enabled to be induced into every kinds of Indogenide including the very Thymolindogenide:
(1) Normal amount (mg) of excretion Within 24 hours.
highest 158.0 (Principle No. (1))137.0 (Principle No. (2)),
lowest 42.5 (Principle No. (1))29.8 (Principle No. (2)),
average 98.0 (Principle No. (1))77.0 (Principle No. (2)).
(2) Normal density mg % highest 22.7 (Principle No. (1))19.7 (Prnciple No. (2)),
lowest 2.5 (Principle No. (1))1.8 (Prnciple No. (2)),
average 9.3 (Principle No. (1))7.5 (Prnciple No. (2)).
(3) Misestimation in quantitative value shown by Principle No. (2) to that of Principle No. (1) is estimated as+2.2-43.0%; average, -26.7%.
3) Various stimulants to give rise to mismeasurement on the side of indican at its quantitative determination that have been able to investigate, were as follows.
(1) The condensation between the thymol and indoxyl in the urine increasing at a gradual ratio, and the quantitative value shows a proportional increase as time for reaction lengthens; yet, if the reagent due to Takeuchi (Estimating method (1)) should be used, it may come to an end after two hours' reaction.
(2) The descent in estimation owing to a shortening of reactionary time may roughly be ascribed to the fact that while the condensation between the thymol and indoxyl remains incomplete, the formation of indigo undergoes certain stimulas.
(3) If one might consider the certain of Jolles's reaction as a principle for indican estimation, it would be told as very unsatisfactory: in fact, even after 2 hours of reaction, already it has been seen to have given rise to so marked a difference as -51-71%. Altogether, the chief cause will be pointed out as the incomplete oxidation owing to Obermayer's reagent.
(4) Order in adding chloroform according to Endo's method, assists to formulate Indigo, but in the same degree affects to decrease to formulate the Thymolindogenide; so that, in 2 hour's reactionary course, it brings about already -20% misestimation.
(5) Endo's standard solution, though excellent in its tint, its titer value amount even to 3 or 3.6 times larger than its theoretical value, being remarkably dense. This may take place, perhaps, when he decided on titer, Mr. Endo employed for standard the indican value estimated by Takeuchi's method.
(6) For an urinal oxidizing agent between the thymol and the indoxyl I might mention that of Mr. Takeuchi as best of that kind. The oxidizing agent indicated by 1% potassium chlorate, 3% hydrogen peroside, 15% ammonium persulphate, 4% chlorinated lime, 10% copper sulphate, under the same conditions, only cope with 1/2 power proved by Takeuchi's, at most. Whereas, sodium nitrit cannot stand to be used because apt to produce some nitrosothymol.
(7) The precipitation rate due to precipitator attributed to urinal indican proves different according to the kinds as well as volume of precipitators.
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