The Estimation of Iodine in Foodstuffs and Body Fluids

Leitch, I; Henderson, John McAskill

doi:10.1042/bj0201003

Cited by 31 publications

(4 citation statements)

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“…This titration method for iodide content was based on the methods of Kendall and Richardson (1920), which was reviewed for accuracy by Leitch and Henderson (1926).…”

Section: Titration Procedures For Iodine Analysismentioning

confidence: 99%

Tracking Iodine Decrease in Commercially Sold Caulerpa racemosa (Forsskål) J. Agardh (Chlorophyta, Ulvophyceae) during Storage

Berones¹,

Yap-Dejeto²

2022

Philipp J Sci

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Iodine is known as an essential mineral for thyroid hormone production in humans. It is water- soluble and diffuses into the atmosphere, where it is thought to break ozone molecules. Caulerpa racemosa (Phylum Chlorophyta, Class Ulvophyceae, Order Bropsidales) is a common dietary seaweed believed to be a good source of iodine in the Philippines. As of this writing, there is no record of iodine concentration measurements in harvested C. racemosa from Philippine waters. There is an expected decrease in iodine concentrations from harvested C. racemosa through time. But how fast it decreases and how much of it remains in the seaweed if stored for days is also unknown. This study measured iodine concentration in C. racemosa samples from an area in the Philippines and calculated the daily changes in iodine level concentrations of harvested C. racemosa that were stored. Titration analyses were done every 24 h, with factors such as the algal age, temperature, light, among others, kept constant. Storage conditions were adapted from how local vendors store leftover seaweed merchandise. Results revealed a decrease in iodine levels over time (y = –20.438x + 228.99; R² = 0.8937). The initial concentration (at dry weight) of iodine measured was 196 ppm and dropped to 94.8 ppm on the seventh day. Iodine levels of freshly picked and stored C. racemosa were also compared with the recommended daily iodine intake for humans.

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“…This titration method for iodide content was based on the methods of Kendall and Richardson (1920), which was reviewed for accuracy by Leitch and Henderson (1926).…”

Section: Titration Procedures For Iodine Analysismentioning

confidence: 99%

Tracking Iodine Decrease in Commercially Sold Caulerpa racemosa (Forsskål) J. Agardh (Chlorophyta, Ulvophyceae) during Storage

Berones¹,

Yap-Dejeto²

2022

Philipp J Sci

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“…8 The method then in use was the older colorimetrie method not accurate to more than 0.05 mg. Since then a number of good methods have been devised, the best probably being those of Kendall,13 McClendon 16 of the von Fellenberg method, and was able to demonstrate the presence of iodine in the thyroids of all fetuses whether their mothers had been given potassium iodide or not. The animal chosen for this work was the rabbit, partly because of its short period of gestation, twentyeight days, and partly because, given suitable condi¬ tions as to food, temperature and environment, it will breed at all times of the year.…”

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confidence: 99%

The Permeability of the Placenta to Inorganic Iodides

Hudson¹

1931

JAMA

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“…Iodine is only present in minute amounts in normal urine, and very small quantities can be determined with reasonable accuracy. The method of determining the iodine in the urine samples was similar to that used by Leitch and Henderson (1926). The method consists briefly of drying and carefully ashing a known quantity of urine with potassium hydroxide, extraction of the iodide with 95 per cent, alcohol, oxidation with bromine-water, removal of excess bromine, addition of potassium iodide, and titrating with N/500 sodium thiosulphate solution after addition of starch.…”

mentioning

confidence: 99%

The permeability of human skin to electrolytes

Whitehouse

Ramage

1933

Proc. R. Soc. Lond. B.

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The epidermis is not only a protective covering against mechanical injury, but presumably protects the body also from diffusion inwards of foreign sub stances or diffusion outwards of normal constituents of the blood. In a previous paper (Whitehouse, Hancock and Haldane, 1932) it was shown that though the epidermis is permeable to water, and the actual permeation is under physiological control and plays an important part in the regulation of body-temperature, yet salts and colloidal substances do not appear to diffuse through the epidermis, so that in this respect the epidermis seems to play the part of a semi-permeable membrane. The question of the permeability of the epidermis to various substances which are met with in mining and other operations, or are applied with a remedial object, is of much practical interest, and in connection with the treatment of mining accidents from burning, the apparent impermeability of the outer epidermis to colloidal solutions of tannic acid and ionized solutions is of special importance. It is presumably the dense stratum lucidum of the external epidermis that tends to stop diffusion.The present investigation deals with the question whether the skin is entirely impermeable to electrolytes in solution. The choice of suitable substances for the tests was necessarily limited to elements which are either not present in urine or blood, or present in only very small amounts, and which could also be detected and determined very accurately.Lithium as a kation was chosen for the first series of experiments, since it is only present in very minute amounts in human blood and urine, and a very small increase in its concentration can be detected. A spectrographic method similar to that used previously by one of us (Ramage, 1929) was used to test for the presence of lithium. A measured volume of urine was rim on to a piece of MunktelFs ashless filter paper weighing about 0*11 gm. After drying in a steam oven, the paper was made into a tight roll and burnt in an oxy-coal gas flame issuing from a fused silica burner, the light being focussed by a quartz lens on the slit of the spectrograph. The piece of filter paper absorbed 0*1 c.c. of fluid easily and, if a larger quantity was necessary for the analysis, it was on May 9, 2018 http://rspb.royalsocietypublishing.org/ Downloaded from

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The Estimation of Iodine in Foodstuffs and Body Fluids

Cited by 31 publications

References 1 publication

Tracking Iodine Decrease in Commercially Sold Caulerpa racemosa (Forsskål) J. Agardh (Chlorophyta, Ulvophyceae) during Storage

Tracking Iodine Decrease in Commercially Sold Caulerpa racemosa (Forsskål) J. Agardh (Chlorophyta, Ulvophyceae) during Storage

The Permeability of the Placenta to Inorganic Iodides

The permeability of human skin to electrolytes

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