Abstract
In this study, we report a new method for iodine extraction from table salts, vegetables, and other food products using ultrasound-assisted extraction, prior to the iodine determination by inductively coupled plasma optical emission spectrometry. For the ultrasound-assisted extraction, deionized water as the extraction solvent and an extraction time of 5 min were found to be the most optimum condition. A linear calibration curve was plotted for 0.1 to 200.0 mg L−1 iodine convention. The limits of detection and quantification were 0.049 and 0.164 mg L−1, respectively. The precision for intraand inter-day analyses was 2.75 and 4.54%, respectively. The accuracy of the method was confirmed with certified reference materials. Recoveries in 47 real samples were ranged between 80.48 and 118.1%. Therefore, the proposed method could be considered as a rapid, simple, and environmental-friendly method (the green extraction) to determine the trace amounts of iodine in different kinds of food products.
Highlights
Iodine is one of the most essential trace elements for humans and other higher animals.[1]
The analytical characteristics of the proposed method were validated under the optimized conditions in terms of linearity, limit of detection (LOD), limit of quantification (LOQ), and precision (expressed as the relative standard deviation (RSD) of the slope of the calibration curve obtained from both intra-day and inter-day analyses) to estimate the efficiency and feasibility of the method using table salts, vegetables, and food products and samples
A linear calibration curve was obtained by titrating an iodine solution of 0.1 mg L−1 to 200 mg L−1 (r2 > 0.9994)
Summary
Iodine is one of the most essential trace elements for humans and other higher animals.[1] Iodine is physiologically required by thyroid gland to synthesize thyroid hormones, such as thyroxin and triiodothyronine, which are required for several normal metabolic processes.[2] The roles of thyroid hormones include the control of growth, development, and some metabolic processes in the body These hormones affect physical and intellectual development, functioning of muscles and nerve tissues, circulatory system, regulation of body heat and energy, and the metabolism of all nutrients.[3] iodine deficiency may lead to various clinical abnormalities including mental retardation, deafness, stunted growth, and neurological problems.[4] Iodine deficiency in human nutrition results in iodine deficiency disorders (IDDs), the most well-known among them is goiter that shows an enlargement of the thyroid gland.
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