Iodine In Aqueous Solution Research Articles

Combined effect of treatment with intrauterine antimicrobials and GnRH on the conception rate of repeat breeder Frieswal cattle

Repeat breeding in cattle inversely affects the profitability of dairy industry by decreasing the conception rate. Selected 18 repeat breeder cows reared under ideal farm conditions and divided them in to three groups of six animals each viz., group I, II and III with four primiparous cows and two second parity cows in each group. The cows in group I were treated with intrauterine preparation containing aqueous solution of povidone iodine (5%w/v) and metronidazole (1%w/v) (Utrodin IU), followed by uterine lavage with 120 mL of normal saline and inseminated them in the oestrus after skipping the first heat. The animals in group II were treated with an IM injection of buserelin acetate (Gynarich) post AI. The cows in group III were treated with both Utrodin IU and Gynarich post AI. The conception rate observed in group I, II and III were 66.67% (4/6 cows), 66.67% (4/6 cows) and 83.33% (5/6 cows), respectively. The results of the study indicated that combined use of intrauterine preparation containing metronidazole and povidone iodine, along with GnRH was more satisfactory than their individual use in improving the conception rate of repeat breeder Frieswal cattle under farm conditions in Kerala.Â

Bisindole [3]arenes—Indolyl Macrocyclic Arenes Having Significant Iodine Capture Capacity

Bisindole [3]arenes—Indolyl Macrocyclic Arenes Having Significant Iodine Capture Capacity

Flexible Oxygen‐Bridged Porous Organic Polymers for Adsorping and Fluorescence Sensing Iodine and the Formation of Liquid Complexes of POPs‐(Poly)Iodide Anions

AbstractThree flexible oxygen‐bridged porous organic polymers (TPG, HCCPA, and HPG) have been synthesized by nucleophilic substitution polymerization reactions. The three POPs display efficient and reversible adsorption of radioactive I2 in vapor and solution. In iodine vapor at 350 K, the maximum iodine adsorption capacities of TPG, HCCPA, and HPG are 5.29, 4.08, and 1.63 g g−1, respectively. The strong affinities for I2 are mainly due to the charge transfer of the POPs to iodine. Interestingly, with the decrease of iodine adsorption, charge transfer complexes of TPG, HCCPA, and HPG exhibit liquid, semi‐solid, and solid states, respectively. Furthermore, the three POPs have been found to fluorescently detect molecular iodine. The S–V quenching constants of TPG, HCCPA, and HPG are 2.01 × 104, 1.14 × 104, and 1.44 × 103 L mol−1, respectively. Their sensitivities decrease with the decrease of iodine adsorption. Pleasingly, HCCPA can sense molecular iodine by fluorescence in aqueous solution. Most probably, this is the first example of POPs used for fluorescent sensing molecular iodine in aqueous solution. Both TPG and HCCPA act as efficient adsorbents and chemical sensors of iodine.

A pillared double-wall metal-organic framework adsorption membrane for the efficient removal of iodine from solution

• Lac-Zn membrane is prepared and featured with a novel pillared double-wall MOF. • The static adsorption capacity for iodine in cyclohexane is 755 mg·g −1 . • The dynamic adsorption capacity for iodine in aqueous solution is 124.9 μmol·g −1 . • Iodine is captured in lac-Zn membrane by nanochannels and charge-transfer interaction. Effective removal of the radioactive iodine from aqueous solution is imperative but still far from the desired level. Here, a pillared double-wall MOF adsorption membrane comprised of {[Zn 3 (DL-lac) 2 (pybz) 2 ]·2.5DMF} n abbreviated as lac-Zn was reported. The synthesis of the lac-Zn membrane is conducted on the polytetrafluoroethylene (PTFE) support via the seed secondary growth method. A smooth and uniform lac-Zn seed layer can be deposited onto the PTFE support with the combination of the vacuum filtration and spin-coating method, and a continuous and well-intergrown lac-Zn polycrystalline film is formed with a thickness of around 25 μm. Lac-Zn polycrystalline film shows good stabality in the irradiation evironment. The maximum static adsorption capacity of the lac-Zn membrane for iodine ions in cyclohexane solution is 755 mg·g −1 , and corresponding dynamic adsorption capacity in aqueous solution is 31.72 mg·g −1 . In the dynamic adsorption of iodine aqueous solution, the iodine removal efficiency decreases from the initial 92.89% to 78.21% at 216 minutes. The iodine ions were captured by the lac-Zn membrane through the formation of I 3 − anions from the solution. The high iodine capture performance of the lac-Zn membrane can be attributed to the confined nanochannels and considerable pore volume providing enough adsorption sites for iodine ions and the abundant π-electron walls in pybz strengthening the affinity towards iodine.

Highly Efficient Adsorption of Iodine in Aqueous Solution

Highly Efficient Adsorption of Iodine in Aqueous Solution

Спектрофотометрическое определение форм присутствия йода в растворах соединений йода

Optical characteristics of aqueous solutions of crystalline iodine and iodine compounds are investigated; the presence of different forms of iodine and selected concurrent compounds in aqueous solutions are determined. The applicability of direct spectrophotometric methods to detecting various forms of iodine and concurrent compounds in aqueous solutions is evaluated.

“Comparative Evaluation of Antifungal Effect of Origanum Oil Solution and Povidone Iodine Aqueous Solution on Scleral Resin: An In-Vitro Study”

“Comparative Evaluation of Antifungal Effect of Origanum Oil Solution and Povidone Iodine Aqueous Solution on Scleral Resin: An In-Vitro Study”

Stable nitrogen-containing covalent organic framework as porous adsorbent for effective iodine capture from water

Enrichment of radioiodine accompanied by nuclear fission threatens the health of humans, and efficient capture of iodine has attracted wide public attention in recent years. Here we report a crystalline mesoporous nitrogen-containing covalent organic framework (TAPB-BPDA COF) as a highly efficient iodine adsorbent, which is synthesized by imine condensation reaction between 1,3,5-tris(4-aminophenyl)benzene and 4,4′-biphenyldicarboxaldehyde. The TAPB-BPDA COF possesses permanent porous structure, high BET surface area of 1082 m2/g, excellent chemical and thermal stability and plenty of nitrogen in the skeleton as effective sorption sites. It displays remarkable adsorption of iodine in aqueous solution up to 988.17 mg/g at room temperature. The adsorption kinetics of iodine onto TAPB-BPDA COF is followed the pseudo-second-order kinetic model, and the adsorption isotherm fits well with the Langmuir model. The TAPB-BPDA COF adsorbs iodine through the weak interaction between the benzene ring on its backbone and iodine, and the electron transfer between nitrogen atoms and iodine promotes the adsorption process. Moreover, TAPB-BPDA COF still maintains efficient adsorption performance after five cycles. These results suggest the great potential of TAPB-BPDA COF as a designable porous to address the problem of nuclear fission waste contamination that threatens human health.

Optimization of the nitrogen content for room temperature rapid synthesis of CuI thin films via liquid iodination method using Cu3N film as precursor

In this work, we demonstrate that CuI films can be obtained by the liquid–phase iodination method with the chemical reaction time only being 1 min between Cu3N and aqueous iodine solution at room temperature. This is a simple and eco-friendly method with high transparency and low resistivity. The Cu3N precursors were prepared by reactive DC magnetron sputtering using different N2 partial pressures. The effect of nitrogen content of precursor (Cu3N) on the structural, electrical, and optical properties of CuI thin films was discussed. Electronegativity property was used to explain the growth mechanism of CuI films prepared by different nitrogen content in the precursor. By growing the CuI films with a N2:Ar gas ratio of 5:2, the average transmittance achieved was 75% in the visible spectral range, and the lowest resistivity achieved was 3.67 × 10–2 Ω cm. These results suggest that the liquid iodination method using Cu3N film as precursor (N2:Ar gas ratio of 5:2) was suitable for preparing high-quality CuI films for application in transparent electronics.

Room-temperature rapid synthesis of CuI thin films via liquid iodination method

Abstract In this work, we successfully synthesised highly transparent and conducting CuI thin films at room temperature via a rapid chemical reaction between the Cu3N precursor and aqueous iodine solution. The effect of the precursor (Cu or Cu3N) on the structural, electrical, and optical properties of the CuI thin films was investigated. The X-ray diffraction results revealed that the prepared films were polycrystalline, preferentially oriented along the (111) planes of the zinc blende structure. In addition, we found that the nitrogen content of the precursor significantly affected the optical and electrical properties of the CuI films. The CuI film obtained by dipping Cu3N film into aqueous iodine solution for 1 min exhibited a conductivity of 29.36 Scm−1 and transmittance of 75% in the visible region. We expect that these findings would assist researchers to rapidly synthesise CuI thin films for transparent electronic devices.

离子碘向元素碘转化行为模型研究

离子碘向元素碘转化行为模型研究

Laparoscopic Retroperitoneal Washout of an Infected Aorto-Bifemoral Graft: A Novel Technique

Aortic prosthesis infection is a challenging complication of aortic bypass surgery with high morbidity and mortality. We report a laparoscopic washout of an infected aorto-bifemoralperigraft collection with radiologic guidance using a nephroscope. The track was dilated with Endouro balloon and sheath to allow access. The cavity was copiously irrigated with saline and aqueous iodine solution. Surveillance computed tomography scan showed no new collection, thrombosis, aneurysm or fistula from the bypass graft. Bilateral lower limbs remained well perfused. Minimally invasive retroperitoneal washout may be a viable alternative to graft explant and extra-anatomical bypass in aortic graft infection.

Highly efficient adsorption of iodine under ultrahigh pressure from aqueous solution

The radioactive nucleus of iodine is known to have debilitating effects on human health. Iodine exists in water in many forms, and it is difficult to accurately determine the iodine content in water. Hence, there are only a few reports on the adsorption of iodine from water. Here, we propose two porphyrin-based metal-organic frameworks (MOFs), denoted as PCN-223 and PCN-223-HPP (the latter treated under ultrahigh pressure), that can be used as adsorbents to effectively adsorb iodine from an aqueous environment. Both the MOFs had good chemical stability, thermal stability, and wet stability and could function at pressures up to 300 MPa. They could also be recycled several times. The specific surface area of PCN-223-HPP was 200 cm2 g−1 higher than that of PCN-223, which imparted an even better adsorption capacity to the former. The study of the adsorption mechanism revealed that the phenyl ring and nitrogen atom on the porphyrin together were responsible for the enhanced adsorption of iodine in aqueous solutions. The adsorption capacities of PCN-223 and PCN-223-HPP for I2 could reach as high as 1300 mg g−1.

Incorporating Morpholine and Oxetane into Benzimidazolequinone Antitumor Agents: The Discovery of 1,4,6,9-Tetramethoxyphenazine from Hydrogen Peroxide and Hydroiodic Acid-Mediated Oxidative Cyclizations.

The reactivity of hydrogen peroxide and catalytic hydroiodic acid toward 3,6-dimethoxy-2-(cycloamino)anilines is tunable to give ring-fused benzimidazoles or 1,4,6,9-tetramethoxyphenazine in high yield. Mechanisms via a detected nitroso-intermediate are proposed for oxidative cyclization and the unexpected intermolecular displacement of the oxazine. An aqueous solution of molecular iodine is capable of the same transformations. Oxidative demethylation gave targeted benzimidazolequinones, including without cleavage of the incorporated oxetane.

Iodine bioavailability from cow milk: a randomized, crossover balance study in healthy iodine-replete adults

Milk and dairy products are considered important dietary sources of iodine in many countries. However, to our knowledge, iodine bioavailability from milk has not been directly measured in humans. The aim of this study was to compare iodine bioavailability in iodine-replete adults from: 1) cow milk containing a high concentration of native iodine; 2) milk containing a low concentration of native iodine, with the addition of potassium iodide (KI) to assess a potential matrix effect; and 3) an aqueous solution of KI as a comparator; with all 3 containing equal amounts of total iodine (263 µg/250 mL). We also speciated iodine in milk. We conducted a 3-wk, randomized, crossover balance study in adults (n=12) consuming directly analyzed, standardized diets. During the 3 test conditions - high intrinsic iodine milk (IIM), extrinsically added iodine in milk (EIM), and aqueous iodine solution (AIS) - subjects collected 24-h urine over 3 d and consumed the test drink on the second day, with 3- or 4-d wash-out periods prior to each treatment. Iodine absorption was calculated as the ratio of urinary iodine excretion (UIE) to total iodine intake. Milk iodine speciation was performed using ion chromatography-mass spectrometry. Iodine intake from the standardized diet was 195±6 µg/d for males and 107±6 µg/d for females; the test drinks provided an additional 263 µg. Eleven subjects completed the protocol. There was a linear relation between iodine intake and UIE (β=0.89, SE=0.04, P<0.001). There were no significant differences in UIE among the 3 conditions (P=0.24). Median (range) fractional iodine absorption across the 3 conditions was 91 (51-145), 72 (48-95), and 98 (51-143)% on days 1, 2, and 3, respectively, with day 2 significantly lower compared with days 1 and 3 (P<0.001). In milk, 80-93% of the total iodine was inorganic iodide. Nearly all of the iodine in cow milk is iodide and although fractional iodine absorption from milk decreases with increasing dose, its bioavailability is high. The trial was registered at clinicaltrials.gov as NCT03590431.

Liquid Thermocouple Using Thermoelectric Ionic Liquids

This article reports on the fabrication and evaluation of a novel liquid thermocouple. The sensor is composed of two microfluidic reservoirs, a heat stage, and three electrodes. One reservoir contains a polymer electrolyte—polyethylene glycol-NaOH (PEG-NaOH)—and the other an iodine aqueous solution. The ionic liquids are electrically connected via a bridging electrode deposited over the heat stage. Varying the temperature of the heat stage causes a temperature distribution across the liquids, which changes the total thermoelectric voltage across the two ionic liquids. The device is fabricated using conventional microfabrication techniques, and the thermoelectric power response and sensitivity are evaluated. The output voltage of the thermocouple increases linearly with the input temperature. The liquid thermocouple has a Seebeck coefficient of 10.6 mV/K and an estimated temperature resolution of 8.94 mK. The ease of fabrication and the characterization results of this ionic liquid-based thermocouple show that it has the potential for integration in microfluidics-based applications such as biosensing and lab-on-a-chip.

Crystal structure of cellulose-iodine complex

Different from starch and amylose [(1 → 4)-α-D-glucopyranan], cellulose [(1 → 4)-β-D-glucopyranan] or wood fiber (natural cellulose or cellulose I) and paper (re-generated cellulose or cellulose II) have been believed for long years in many papers and high-school textbooks that they do not form an iodine complex at all. This legend originated from the characteristic conformation of cellulose chain, which is fully extended and had been believed to be impossible to entrap the long iodine ions likely the case of amylose helical chain. However, people often observe such a phenomenon that a filter paper is dyed easily when it is immersed into the iodine aqueous solution. On the basis of the X-ray diffraction measurements of the various kinds of cellulose materials (a piece of wood, bacteria cellulose, paper, cellophane, and so on), the present study has confirmed that cellulose forms the crystalline complex with iodine, as known from the change of X-ray diffraction pattern before and after the complexation. The crystal structure of cellulose-iodine complex has been proposed through the X-ray data analysis and the complex formation mechanism was discussed quantum-chemically by comparing the crystal structure between the original cellulose and its iodine complex. After the completion of the structural analysis of this complex, we happened to notice the paper by Hess et al. (Kolloid Z. (153) 1956, 128) reported about 60 years ago, who measured the X-ray diffraction patterns of cellulose immersed into iodine solution and assigned one reflection of 9.0 Å spacing to the characteristic to the complex. But no detailed analysis was made, and their paper did not get much attention in these 60 years, resulting in the above-mentioned wrong and long legend. The present paper has succeeded for the first time to break through such a common sense and to establish the formation of crystalline cellulose-iodine complex by the detailed X-ray structure analysis.

Influence of collection substrate and extraction method on the speciation of soluble iodine in atmospheric aerosols

Abstract The extraction into aqueous solution of total soluble iodine (TSI), iodide and iodate were examined as a function of extraction times between 5 and 60 min for two different extraction methods and from two types of commonly used aerosol collection substrates. The extraction methods tested were ultrasonic agitation and mechanical shaking, while the substrates were cellulose fibre (CF) and glass fibre (GF). Tests were carried on substrates spiked with known amounts of iodide and iodate and on a pair of ambient aerosol samples collected at the University of East Anglia on both substrates over the same time period. The combination of ultrasonic agitation and CF substrates (which has been used in many published studies of aerosol iodine speciation) was shown to lead to variable recovery of iodine species and changes in speciation over extraction time. Mechanical shaking of GF substrates gave good recoveries of iodide and iodate from spiked experiments and stable speciation with time for the ambient aerosol sample. This combination is recommended for future use in the determination of aerosol iodine speciation. Mechanical shaking also appeared to be preferable to ultrasonic agitation for samples that were collected on CF substrates. The optimised conditions (mechanical shaking of GF substrates for 30 min) were applied to the analysis of samples collected during the Stratospheric ozone: Halogen Impacts in a Varying Atmosphere (SHIVA) cruise in the South China and Sulu Seas in November 2011. The results obtained showed variable proportions of iodide, iodate and soluble organic iodine species in these samples, with iodide concentrations possibly related to airmass history and background chemistry.

AA11. Laparoscopic Retroperitoneal Washout of an Infected Aortobifemoral Graft: A Novel Technique

Aortic prosthesis infection is a challenging complication of aortic bypass surgery with high morbidity and mortality. We report a successful image-guided, minimally invasive retroperitoneal washout of an infected aortobifemoral graft with 11 × 13-cm collection in a 71-year-old patient. Using a radiologically placed drainage catheter, laparoscopic washout of the infected perigraft collection was performed with image intensifier guidance. The tract was serially dilated, and the cavity was irrigated with copious saline and aqueous iodine solution under direct vision with a rigid nephroscope (Figs 1 and 2). A drain was left in situ for another week, and the patient completed 6 weeks of targeted antibiotic therapy. Surveillance computed tomography scan showed no new collection, thrombosis, aneurysm, leak, or fistula from the bypass graft. Bilateral lower limbs remained well perfused. Whereas video-assisted retroperitoneal débridement has recently been established as a viable surgical treatment of infected pancreatic necrosis, this is the first described case of minimally invasive video-assisted retroperitoneal washout of an infected aortic graft collection. Minimally invasive retroperitoneal washout may be a viable alternative to graft explantation and extra-anatomic bypass in aortic graft infection.Fig 2Intraoperative fluoroscopy showing position of guidewire after removal of previous percutaneous drain, dilation of the tract over guidewire with Enduro (Bard, Tempe, AZ) balloon, and insertion of the 24F sheath and nephroscope within the retroperitoneal space.View Large Image Figure ViewerDownload Hi-res image Download (PPT)

Preparation and characterization of a new biocarbon material derived from Macaranga gigantea (giant ‘Mahang’) leaf biomass as precursor

This study presents the preparation of biocarbon material from Macaranga gigantea leaf biomass. In an attempt to examine its potential as adsorbent, the most essential part in determining the performance is to investigate their physicochemical properties. The physicochemical properties of the prepared biocarbon was characterized by their adsorptive nature towards methylene blue and iodine to estimate their surface area and pore volumes. The present study focused on the adsorption performance comparison of three different forms of pyrolyzed biomass which were granulated coconut shell (GCS), powdered coconut shell (PCS), and powdered Mahang leaves (PML), respectively to remove both methylene blue (MB) dye and iodine in aqueous solution. The iodine number for PML showed greater difference compared to PCS and GCS following range PML(557.72)>PCS(321.91)>GCS(188.14). The findings indicate that powdered biomass had higher adsorption for methylene blue dye than granulated biomass at all various initial concentration used due to higher surface area. Among which, PML has higher MB removal by 86.41% at initial concentration 50 mg/L. The data of MB adsorption of GCS and PML fitted well with the Freundlich model meanwhile Langmuir model was applicable for describing the adsorption data of PCS