We endeavor therefore to obtain evidence of the presence of morphia and meconic acid.
To separate the meconic acid the substance on the filter is to be diffused through water, and sulphuretted hydrogen passed for a time.
Sulphide of lead is thus thrown down and may be separated by filtration, the meconic acid remaining in solution.
By acting upon meconicacid with ammonia, comenamic acid is formed, and this latter, when heated with zinc dust, yields pyridine.
This separates the meconic acid as lead meconate, whilst the morphia is dissolved in the acetic acid set free.
By saturating an aqueous solution of meconic acid with morphia, and evaporating the solution by a gentle heat, so that crystals may be obtained.
These depend chiefly on the chemical and physical characters of morphia and meconic acid, the tests for which have been already noticed.
In employing the following method the use of alcohol to extract the morphia is avoided, and meconic acid is separated at an early stage, which prevents the formation of a basic meconate on precipitation of the morphia.
Meconic acid, 11 parts; morphia, 14 parts; dissolve each separately in hot water, q.
Impure meconic acid crystallises on cooling, and may be purified by repeated treatment in the same way with hydrochloric acid.
Meconic acid forms beautiful pearly scales; possesses a sour astringent taste; is soluble in boiling water, and to a less extent in cold; it is also soluble in alcohol.
So do porphyroxin; narcein; probably papaverin also; while meconin, whose acrid properties in contact with animal tissue are similar to that of meconic acid, forms the last of the group.
The sulphuric acid will liberate the meconic acid, and thus enable it to produce with the iron the appropriate colour, which demonstrates the presence of that acid, and consequently of opium.
The filtrate will contain any alkaloids, whilst meconic acid, if present, is bound up with the lead on the filter.
The most generally accepted view at the present time is that the physiological action of meconic acid is similar to that of lactic acid--viz.
In any case where the analyst has found only meconic acid, the question may be raised in court as to whether it is a poison or not.
If the quantity is so small that it cannot be conveniently weighed, it may be estimated colorimetrically, by having a standard solution of meconic acid, containing 1 mgrm.
Alcohol= dissolves resin and caoutchouc, and all the alkaloids and their combinations, with meconic acid, &c.
Free morphine would be left insoluble; but it seems always to be combined with meconic and acetic acids.
It is usually laid down in forensic works that, where poisoning by opium is suspected, it is sufficient to detect the presence of meconic acid in order to establish that of opium.
Pills containing either solid opium or the tincture usually betray the presence of the drug by the odour, and in such a case there can be no possible difficulty in isolating morphine and meconic acid, with probably one or two other alkaloids.
Concentrate the solution of meconic acid, allow a portion to crystallize, and apply tests.
Put the meconate of lead with water into a beaker and pass hydrogen sulphide; sulphide of lead is formed, and meconic acid set free.
Opium itself cannot be directly detected, but we test for morphine and meconic acid.
Meconic acid gives a blood-red colour with perchloride of iron, not discharged by corrosive sublimate or chloride of gold.
They exist in the plant combined with vegetal acids, some of which are characteristic, as aconitic acid in aconite, meconic in opium, igasuric (?
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "meconic" in a variety of sentences. We hope that you will now be able to make sentences using this word.
