Some Uses Of Lugols Iodine Solution

By Elaine Guthrie


Iodine is available in many different forms. Since it was first prepared in1829 by a French physician, Lugols iodine solution, continues to play a major role in scientific research and everyday use. The solution is prepared by dissolving elemental iodine and the compound potassium iodide in water. It is diluted to various concentrations depending on the intended use. It is also known as iodine potassium iodide Markodine or Strong solution.

Markodine is available as an over the counter formulations such as gels, tinctures and ointments. These formulations are mainly designed for topical use where there is a need to disinfect minor skin injuries. It is common to mix the iodine with another ingredient known as povidone so as to increase the effectiveness. Another major application is the use in disinfection of water especially in emergency situation.

In biochemistry, Markodine is used in detection of starch in some organic compounds. In the presence of starch there will be a blue black colour change. This is because the element interacts with the polysaccharides found in starch. It, however, does not detect simple sugars such as glucose, fructose and galactose. A similar pattern of staining is seen when testing for a condition known as amyloidosis although amyloid is actually protein and not starch.

In medical practice there is extensive use of the solution in management of cancer patients. It is particularly important in screening for cervical cancer. Staining of the cervix and upper vaginal wall is done under examination done using an instrument known as a colposcope. The normal tissues stain deeply with the brown colour while the suspicious areas remain paler. Biopsy specimens are taken from the paler areas.

Markodine is used in the management of selected patients with Graves disease as they undergo surgery (thyroidectomy). Graves disease is a severe form of hyperthyroidism. It has been established through research that when administered intraoperatively, the solution reduces the amount of blood loss. This benefit may not be seen in patients whose thyroid function is normal or those that are on antithyroid medication.

In the early years of its discovery, the solution was an important treatment of gout. With scientific advancement over the years, it has fallen out of favour. The same fate has befallen it for the treatment of hyperthyroidism in which case it had been the first line drug for a long time. The main side effect associated with it was inhibition of thyroid hormone synthesis (also known as the Wolff Chaikoff effect).

In the marine and aquarium industry, the compound is vital for macroalgae growth and for the survival of coral reef inhabitants. This effect is believed to be the result of a reduction in the number of unwanted bacteria and parasites within the same habitat. The other major benefit is the expansion of polyps and prevention of coral bleaching in instances where the light intensity is abnormally high.

When used in excess, the compound may have some unwanted effects on the body. At low dilutions, it is said to have an irritating and corrosive effect on the stomach mucosa. This may be encountered when conducting endoscopic examinations. Generally, however, it is regarded as being safe.




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