DETERMINATION OF TOTAL IODINE IN IODINE-E NRICHED EGG BY OXYGEN FLASKCOMBUSTION

A simple and sensitive method was developed for the determination of t otal iodine in iodine-enriched eggs (IEs). The egg yolk and white of I E were homogenized with ethanol. The homogenate was decomposed by oxyg en flask combustion with an alkaline absorbing solution. After the com bustion, iodide (I-) obtained in the absorbing solution was concentrat ed by solid-phase extraction with an anion-exchange column. The concen trated I- was determined by reversed-phase HPLC with a UV detector. Th e reproducibility obtained for the determination was good. The recover ies of iodine added to the egg yolk and white were about 90%. The meth od was applied to the determination of total iodine in commercial IEs.