Product category:
Titration equipment
News Release from: Metrohm UK | Subject: Metrohm 809 Titrando titration system
Edited by the Laboratorytalk Editorial
Team on 20 August 2007
Titration unit determine sodium
bicarbonate levels
A titration can be carried out to determine the sodium bicarbonate levels in aspirin based tablets by using a Metrohm 809 Titrando in conjunction with the 800 Dosino dosing system.
These systems can be used to determine sodium bicarbonate levels by a non aqueous titrimetric method using perchloric acid as the titrant and glacial acetic acid as the solvent The measurement is fully in accordance to the pharmaceutical standard CFR 21 Part 11
This article was originally published on Laboratorytalk on 2 Jul 2008 at 8.00am (UK)
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Aspirin, sodium bicarbonate, and citric acid combination is used to relieve pain occurring together with heartburn, sour stomach, or acid indigestion.
The aspirin in this combination is the pain reliever.
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Aspirin belongs to the group of medicines known as salicylates and to the group of medicines known as anti-inflammatory analgesics.
The sodium bicarbonate in this medicine is an antacid.
The compound neutralises stomach acid by combining with it to form a new substance that is not an acid.
Aspirin, sodium bicarbonate, and citric acid combination may also be used to lessen the chance of heart attack, stroke, or other problems that may occur when a blood vessel is blocked by blood clots.
The aspirin in this medicine helps prevent dangerous blood clots from forming.
However, this effect of aspirin may increase the chance of serious bleeding in some people.
Many give the title of 'discoverer of aspirin' to Felix Hoffmann, a chemist at Bayer whose father suffered from rheumatism.
According to legend, Hoffmann's father was taking salicylic acid, already mass-produced, widely used, and highly profitable by the end of the 1870s, to treat his rheumatic condition.
Unfortunately, the drug was terribly irritating to the stomach and was associated with other ill-effects: most notably, in addition to having an unpleasant, sometimes nauseating, taste, it was believed that salicylic acid disrupted digestion and had an enfeebling action on the heart.
Therefore, the dutiful son took on the task of developing a less toxic replacement.
However, acetylsalicylic acid (ASA) - the common chemical name of aspirin - may have already been produced by the French chemist Charles Frederic Gerhardt in 1853, although he called his compound acetosalicylic anhydride, which was not necessarily the same as ASA.
The compound was synthesised in a purer form by Johann Kraut in 1869.
Indeed, acetylsalicylic acid was already being manufactured by the Chemische Fabrik von Heyden Company in 1897, although without a brand name.
Therefore, it is difficult to determine whether Hoffmann truly developed a new chemical compound or even a novel method of producing a known one, which could then have been patented in Germany.
This ratio is critical, and slight increases or decreases of one or more components can have catastrophic affects.
The aspirin level is typically determined using UV.
The sodium bicarbonate on the other hand is determined by a non aqueous titrimetric method using perchloric acid as the titrant and glacial acetic acid as the solvent.
Using a Metrohm 809 Titrando in conjunction with the 800 Dosino dosing system the titration is able to take place in a completely sealed vessel, where the glacial acetic acid is added accurately using a second Dosino and after the titration, the whole contents of the titrated solution is aspirated to waste using the second bidirectional port of the Dosino.
A solvent blank is performed and this is automatically stored by the Titrando and then used in the subsequent calculation of the sodium bicarbonate concentration.
The indicator electrode used is the Solvotrode Metrosensor that is designed specifically for such demanding titrations.
Whole tablets can also be analysed by smashing up the tablet in situ using an in built homogenizer. Request a free brochure from Metrohm UK ...
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