PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “ION EXCHANGE RESINS”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 289 records · Page 16Linked to original sources
PubMedDate not supplied

Evaluation of ion exchange resins for removal of inhibitory compounds from corn stover hydrolyzate for xylitol fermentation.

The use of dilute acids to catalyze the hydrolysis of hemicellulose to its sugar constituents is well-known and effective. However, a major problem associated with this pretreatment is the poor fermentability of the produced hydrolyzate as a result of the presence of the microorganism's inhibitory compounds. In the present work, seven ion-exchange resins were tested in order to detoxify corn stover hydrolyzate. Regarding xylose recovery, it was observed that more than 92% recovery was feasible. Furfural removal varied from 53.% to 99.%, and hydroxymethylfurfural (HMF) removal was effective between 37% and 100%. Acetic acid was totally removed by Purolite A 103 S resin. Corn stover hydrolyzate (CSH) treated with Purolite A 103 S, and Finex CS 14 GC resins, was tested as substrate for xylitol production using a yeast, Candida mogii. Product yields, Yp/s, of 0.41 and 0.37 g/g and cellular yields, Yx/s, of 0.24 and 0.13 g/g, respectively, were obtained using the two types of resin-treated hydrolyzates.

Candida↗
PubMed2002

Chemiluminescent investigation of tris(2,2'-bipyridyl)ruthenium(II) immobilized on a cationic ion-exchange resin and its application to analysis.

Tris-(2, 2'-bipyridyl)ruthenium(II) complex, Ru(bpy)(3)(2+), was immobilized on the Dowex-50 W cationic ion-exchange resin. The chemiluminescent characteristics of Ru(bpy)(3)(2+) in solution and in resin form were compared by using batch and flow injection methods. A strong chemiluminescence was observed during the reaction of Ru(bpy)(3)(2+) both in solution and in resin with KMnO(4) or Ce(SO(4))(2) under acidic or basic conditions. The Ru(bpy)(3)(2+) immobilized resin is stable, which can be used at least for 6 months when it reacts with the dilute KMnO(4) solution. Based on this property, Ru(bpy)(3)(2+) immobilized in the resin phase was developed as a flow-through chemiluminescent sensor that could be used to determine oxalate, sulfite and ethanol chemically or electronically with Ru(bpy)(3)(3+) generation on the surface of resin. The limits of detection were 1 x 10(-6) M for oxalate, 0.5% (v/v) for ethanol and 1 x 10(-7) M for sulfite. The method has been successfully applied to determine sulfite in sugar.

Journal Article↗
PubMed1987

[Nosocomial Pseudomonas pickettii infection. Danger of the use of ion-exchange resins].

In a recent nosocomial outbreak of Pseudomonas pickettii infection at the general hospital of Corbeil-Essonnes, France, two patients were moderately affected, but two others, who were diabetic, died of septicemia. The infection was transmitted by 0.05% aqueous solutions of chlorhexidine, the treatment of water for these solutions being the cause of contamination. The ion-exchange resin in the deionization cartridges allowed the surviving bacteria in the city water supply to grow while the bacteriological filters downstream only lowered the contamination level. The 0.05% chlorhexidine aqueous solutions failed to prevent growth up to 4 X 10(6) bacteria/ml. P. pickettii is resistant to aminoglycosides and colistine.

Adolescent↗
PubMed2002

A throughfall collection method using mixed bed ion exchange resin columns.

Measurement of ionic deposition in throughfall is a widely used method for measuring deposition inputs to the forest floor. Many studies have been published, providing a large database of throughfall deposition inputs to forests. However, throughfall collection and analysis is labor intensive and expensive because of the large number of replicate collectors needed and because sample collection and chemical analyses are required on a stochastic precipitation event-based schedule. Therefore we developed and tested a throughfall collector system using a mixed bed ion exchange resin column. We anticipate that this method will typically require only one to three samplings per year. With this method, bulk deposition and bulk throughfall are collected by a funnel or snow tube and ions are retained as the solution percolates through the resin column. Ions retained by the resin are then extracted in the same column with 2 N KCl and analyzed for nitrate and ammonium. Deposition values in throughfall from conventional throughfall solution collectors and colocated ion exchange samplers were not significantly different during consecutive 3- and 4-month exposure periods at a high (Camp Paivika; >35 kg N ha(-1) year(-1)) and a low deposition (Barton Flats; 5-9 kg N ha(-1) year(-1)) site in the San Bernardino Mountains in southern California. N deposition in throughfall under mature pine trees at Camp Paivika after 7 months of exposure was extremely high (87 and 92 kg ha-1 based on the two collector types) compared to Barton Flats (11 and 13 kg ha(-1)). A large proportion of the N deposited in throughfall at Camp Paivika occurred as fog drip, demonstrating the importance of fog deposition as an input source of N at this site. By comparison, bulk deposition rates in open areas were 5.1 and 5.4 kg ha(-1) at Camp Paivika based on the two collector types, and 1.9 and 3.0 kg ha(-1) at Barton Flats.

Ammonia↗