Topic
Iodide
About: Iodide is a research topic. Over the lifetime, 17796 publications have been published within this topic receiving 300995 citations. The topic is also known as: iodides & iodide salt.
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TL;DR: Proteins differ in their susceptibility to iodination by this method, and human gammaG immunoglobulin, for example, is iodinated more than ten times as readily as is human alpha(2)-macroglobulin under the same conditions.
Abstract: 1. A method is described for the trace iodination of immunoglobulins and other serum proteins by a system consisting of lactoperoxidase, hydrogen peroxide and iodide. 2. gammaG immunoglobulin that had been labelled to a specific radioactivity of 5muc/mug. by use of carrier-free [(125)I]iodide gave no evidence of denaturation when analysed by electrophoresis and density-gradient ultracentrifugation. 3. Tryptic hydrolysis and peptide ;mapping' of a completely characterized peptide radioiodinated by this method showed that the [(125)I]iodide was bound to tyrosyl residues. 4. Proteins differ in their susceptibility to iodination by this method. Human gammaG immunoglobulin, for example, is iodinated more than ten times as readily as is human alpha(2)-macroglobulin under the same conditions. 5. Lactoperoxidase catalyses the iodination of proteins much more readily than does horseradish peroxidase.
1,335 citations
1,120 citations
1,086 citations
TL;DR: Mechanistic insights into oxygen-induced photodegradation of perovskite films are reported, finding fast oxygen diffusion into CH3NH3PbI3 films is accompanied by photo-induced formation of highly reactive superoxide species from oxygen.
Abstract: Methylammonium lead halide perovskites are attracting intense interest as promising materials for next-generation solar cells, but serious issues related to long-term stability need to be addressed. Perovskite films based on CH3NH3PbI3 undergo rapid degradation when exposed to oxygen and light. Here, we report mechanistic insights into this oxygen-induced photodegradation from a range of experimental and computational techniques. We find fast oxygen diffusion into CH3NH3PbI3 films is accompanied by photo-induced formation of highly reactive superoxide species. Perovskite films composed of small crystallites show higher yields of superoxide and lower stability. Ab initio simulations indicate that iodide vacancies are the preferred sites in mediating the photo-induced formation of superoxide species from oxygen. Thin-film passivation with iodide salts is shown to enhance film and device stability. The understanding of degradation phenomena gained from this study is important for the future design and optimization of stable perovskite solar cells.
850 citations
TL;DR: In this paper, a simple and rapid method for the spectrophotometric determination of hydrogen peroxide using potassium titanium(IV) oxalate is described, which can be used to measure peroxide concentrations down to about 10 µM (0.3 mg kg-1) under the most favourable conditions.
Abstract: A simple and rapid method for the spectrophotometric determination of hydrogen peroxide using potassium titanium(IV) oxalate is described. The method can be used to measure peroxide concentrations down to about 10 µM(0.3 mg kg–1) under the most favourable conditions. A variety of complexing and reducing agents, and catalysts of peroxide decomposition, known to interfere with the alternative iodide method for peroxide determination, had no effect. Fluoride was found to interfere.
783 citations