cation exchange resins

..With this pH we ran labscale columns to purify monoclonal antibody. The cation exchangers showed high step yields and host cell proteins in the pools from gradient elution were reduced very effectively...

..The developed method is very practical and can provide useful information and results for the clinical or biomedical researches with low analytical run costs...

..Such results are in agreement with recent studies related to ion exchange of whole antibody molecules under similar conditions...

..66, 0.67, 0.42 and 0.86 microM and detector responses were linear in the range 1-100, 1-80, 2.5-100 and 10-40 microM, for SA, NTCA, PA and BA, respectively. Precision for retention times was 0.36% and for peak areas was 1.5%...

..The detection limits of these acids in the present study with conductivity detection were 3.4 microM for monochloroacetic acid, 0.86 microM for dichloroacetic acid and 0.15 microM for trichloroacetic acid...

..The ion-exclusion chromatographic separation of carboxylic acids with high resolution and sensitivity was accomplished successfully by elution with a 1 mM benzoic acid-10 mM cyclodextrin solution without chemical suppression...

..Resolution, recovery and purity were examined in order to verify the proposed method...

..Stepwise elution experiments were also designed and performed successfully on the basis of the K-I curve...

..It was found that the separation of alkaline ions and 1,1-dimethylhydrazine (UDMH) were much better that those for the commercial material...

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..5 or anion-exchange chromatography (AEX) at pH 7.2 without lowering the salt concentration in the CCS. The performance of both CEX and AEX was predicted to be equal for this particular MAb capture...

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..Effects of salt concentration and ACN content on the separation have also been investigated. High column efficiencies of up to 352 000 plates/meter were obtained by the separation of narcotic pharmaceuticals...

..The dependence of sorption selectivity on protein size and on concentration of ionogenic groups was demonstrated...

..The experimental data were successfully explained with a rate-based column model, which accounted for the volume changes of the stationary phase. A thermodynamic sorption model was utilized in column calculations...

..Examples are given. Methods that require eluent gradients and/or step changes of eluent concentration are especially well suited to this column because the background conductivity remains almost unchanged under gradient conditions...

..36 to 0.68 microM for anions and 0.63-0.99 microM for cations. This method has been applied to the simultaneous determination of anions and cations in several environmental waters with satisfactory results...

..The strength of the strategy was demonstrated by applying it to bovine serum albumin. Potential use of the strategy in proteomics was also discussed...

..In addition, the results provide heuristics for the optimization of chromatographic conditions...

..The interaction between chelating weak cation-exchanger and metal ions was examined. The retention mechanism of protein in metal chelating chromatography was explored...

..1-2.9% for anions and 1.8-4.5% for cations. This method was successfully applied to hot spring water containing strong acid anions, weak acid anions and cations, with satisfactory results...

..The results indicate that spacer arm length may be a useful variable in manipulating stationary-phase retention properties...

..To optimize the adsorption condition of cation-exchange chromatographic media Streamline SP for separation and purification of anti-HBsAg Fab fragment from E. coli...

..The cleavage occurs after the first guanosine base and is inhibited by 5-methyl-cytosine methylation. The restriction activity is salt-sensitive and has an optimal activity around 70 degrees C...

..These observations are interpreted in terms of the structural features of the proteins and the physicochemical properties of the adsorbents...

..The results presented in this paper demonstrate that this parallel batch screening-QSER approach can be employed for the identification of selective and high-affinity displacers for protein mixtures...

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..Taken together with the previous report in which a series of polycations were explored for efficient purification, expression of a target protein fused with a strong polycation provides a straightforward protein preparation scheme...

..Varying the ligand ratio (SP/Phenyl) could be used for optimizing the function of mixed-ligand ion-exchange media...

..The optimal conditions for sorption and complete desorption of eremomycin were found...

..In the model study presented here, we were able to obtain N-glycans for HPAEC analyses without any interfering materials by a combination of TNBS reaction and graphitized carbon treatment...

..Moreover, the method performance characteristics of selectivity, sensitivity and accuracy have been demonstrated to be suitable to determine the related impurities in the capsules of Drug A...

..The strategy also includes an integrated site-specific removal of the Z(basic) purification handle to yield a free target protein...

..The results from this study were applied to the cation-exchange step for a recombinant protein that was sensitive to pH excursions to help maintain activity of the protein during the purification process...

..Appropriate conditions were defined for the separation of human serum and for the isolation of subtilisin Carlsberg and beta-galactosidase from cell culture supernatants...

..Significant differences in the chromatographic behavior (elution pattern, peak shape and selectivity) of the test samples are discussed in regard to the column type and the chromatographic conditions...

..Additional information is required to elucidate further the mechanisms of coupled diffusion and adsorption in stationary phases...

..0 min with only one step. The purity and specific bioactivity of the purified lysozyme were found to be more than 93% and 70 245 U/mg, respectively...

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..For these ion-exchangers, high protein adsorption capacities are attained when a low-density polymer gel with a high concentration of functional groups is present...

..99. The mean value of relative standard deviations from five replicates was 3.9%. The usefulness of the method is illustrated with two chromatograms of a carrot juice sample obtained before and after the in-line removal of carbohydrates...

..75 mM pyridinedicarboxylic acid as an eluent. Contactless conductometric detection (C(4)D) allows LODs down to 150 nmol/L, corresponding to 30 fmol injections. Analysis of real water samples is demonstrated...

..A correlation describing the effect of the separation conditions on the diffusion rate is therefore needed in order to have a fully predictive mathematical model...

..Protein retention was increased on adsorbents with pore size distributions that include significant amounts of pore space with dimensions similar to those of the protein solute...

..For the last three samples macrocyclic PAs (senecionine, senecionine-N-oxide. senkirkine) have been detected for the first time. Details of precision of the analyses are also included...

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..Binding to strong cation exchange resins (sulfonate-PHM) was not observed...

..The treatment consisted of salt and sodium bicarbonate supplements, restricted potassium intake, cation exchange resins and high fluid intake. During first year she was hospitalized for severe salt-losing crises...

..DMP resinates were formed by a complexation of DMP and strong cation exchange resins, Dowex 50 W and Amberlite IRP69...

..SMM peak identification and quantification (401.2nmolmL(-1) relatively to norleucine used as internal standard) were carried out by comparison with commercial SMM...

..2-20 microM with selected-ion monitoring. Finally, the on-line sample preparation system was evaluated for the mass spectrometric analysis of complex oligonucleotide mixtures...

..10 g/mL of CE-4 in a 0.2% soybean globulin solution for 6 h at 4 degrees C. The amount of calcium bound to the soybean globulins decreased with removal of the phytate but increased with deamidation...

..Drug resin complexes (DRCs) were prepared using the batch method with (i) two weak cation exchange resins, Polacrilex with exchangeable H+ and Polacrillin potassium; and (ii) a strong cation exchange resin;Sodium ..

..Furthermore, iminodiacetate resin-treated plasma would be useful as a substrate for measuring the activity of these factors...

..Hepatic glycogen was extracted, digested to glucose and purified on anion-cation exchange resins. After the optimization of methylboronic acid derivatization using GC-MS, [(13)C] enrichment of extracted ..

..The performance of the anion chromatography, using on-line recycled eluents, was the same as that for normal anion chromatography under the same conditions...

..More attractively, the exhausted HFO-001 beads can be effectively regenerated by HCl-NaCl solution (pH 3) for repeated use without any significant capacity loss...

..As a result, PrDS retained their high calcium binding properties even after hydrolysis by digestive enzymes. In situ experiments showed that PrDS and their hydrolysates enhanced the calcium absorption from the intestine...

..Hardness ions can be removed with cation exchange resins, although typically using a fixed bed reactor at the end of a treatment train...

..74 mg/l; Ca2+= 1.79 mg/l). The aim of this study was to remove this ammonium by ion exchange. Acidic gel cation exchange resins and clinoptilolite were tested in column experiments to evaluate their capacity, flow rates and pH...

..These results indicate that this method provides a simple and rapid procedure for precise determination of amino acids in whole blood...

Dynamic binding capacity (DBC) of a monoclonal antibody on agarose based strong cation exchange resins is determined as a function of resin ligand density, apparent pore size of the base matrix, and protein charge...

..It was also exchangeable by anion but not cation exchange resins, indicating that the inhibitor has a molecular weight between 1000 and 500, and negative charge on its ..

..These findings indicate that the bridge bonding of anions between the metal ions adsorbed on the resins of the higher exchange capacities plays a crucial role for the coadsorption. Some analytical implication was also discussed...

..8 and Crown Ether cation exchange resins) were tested...

The performance of functionalized materials, such as cation exchange resins, is dependent not only on the ligand type and ligand density, but also on the pore accessibility of the target molecule...

..02-0.6 gLAS/g. Negatively charged materials, such as cation exchange resins or bentonite clay, have negligible adsorption capacities for LAS...

..are directly loaded onto a microcapillary column packed sequentially with reversed-phase and strong cation exchange resins. Once digested protein samples are loaded onto the column, the column is placed in-line between a high-..

..Results showed that metformin HCl was successfully taste masked and formulated into a sustained dosage form as an alternative to the conventional tablet...

..2 mg g(-1), which is almost half the capacity of commercially available weakly acidic cation exchange resins. The phosphorylated residue could be reused several times, although cadmium sorption gradually decreased ..

..The practical utility of polyanilineZr(IV)sulphosalicylate cation exchanger has been established for the analysis and recovery of heavy metal ions in environmental samples...

..We report a case of an 87-year-old woman with a clinical history of chronic angiotensin-receptor blocker consumption that led her to dangerous bradyarrhythmia, cardiogenic syncope, and risk of sudden cardiac death...

..The results indicate that halloysite nanotubes have a high loading capacity for Ru(bpy)(3) (2+) and that dopamine is suitable for the preparation of modified electrodes...

..g. serum) liquid solutions for subsequent monitoring and evaluation. However, the drug release solution and release time must be optimized more precisely in order to validate described sample preparation method for each basic drug...

..9 and 12.4%, respectively) agreed with the sum of the two peaks (12.1%) in the HPLC trace. Similarly, Hb Belleville was detected and identified in another Caucasian, also from Yorkshire, with normal Hb A(1c)...

..Furthermore, both SCX materials allowed successful separation of C9-epi and 10,11-didehydro derivatives from their respective educts in an application in synthetic Cinchona alkaloid chemistry...

..The mean absolute recovery for sotalol was about 60%. The limit of quantitation was 25 ng/ml and R.S.D. for repeatability and intermediate precision obtained at a concentration level of 50 ng/ml were 4.3 and 5.8%, respectively...

..These results indicate that VEGF exerts a protective effect on ischemic skeletal muscle flaps...

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..The extractabilities of Cu(II), Ni(II), Co(II) and Zn(II) into PAA-CAPS were examined. The stripping of the various cations can be promoted in diluted hydrochloric acid solutions...

..e., acidic, neutral, hydrophobic, and basic groups. The results provided fundamental data for constructing gradient elution systems required for the simultaneous separation of protein amino acids...

..6 cm (106 mL). This approach significantly improved throughput while reducing development time and material consumption...

..defined which would help identify patients with hyperkalemia owing to suboptimal levels of aldosterone, thereby validating treatment with 9-alpha-fluhydrocortisone, instead of cation exchange resins, if more conservative treatment fails.

The purpose of this research was to mask the bitter taste of Diphenhydramine Hydrochloride (DPH) using cation exchange resins. Indion 234 and Tulsion 343 that contained crosslinked polyacrylic backbone were used...

..A fast separation of ten peptides in less than 3.5 min on IE-CEC by adoption of the highly applied voltage was demonstrated...

..In conclusion, human T lymphocytes can be efficiently transduced, under clinically applicable conditions, by adenovirus-LipofectAMINE complex after 7 days of culture with IL-2 and IL-12 or IL-7...

..This study characterizes the eDNA extracted from the novel activated sludge biofilm process of aerobic granules...

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..The present study is designed to mask the bitter taste of etoricoxib by complexation with weak cation exchange resins (Indion 214, 234 and 414) in order to increase its compatibility and patient compliance...

..It was concluded that these phenomena are due to lateral interactions between immobilized proteins and analyte proteins subsequent to electrostatic adsorption of the analyte on the underivatized surface of ion-exchange sorbents...

..The FAME yield was 97.5% at a reaction temperature of 100 °C in the fixed-bed with a height of 5 cm when the methanol and oleic acid feed rates were 8.6 and 9.0 mL/h, respectively...

..It has been demonstrated that the system can differentiate negative (normal) from positive (HbE carriers) subjects...

..The majority of identified proteins were membrane proteins. In sum, our results demonstrate that DC is a suitable alternative to gradient elution separations for the identification of proteins via a multidimensional LC-MS approach...

..TSKgel SP-5PW and Toyopearl GigaCap S-650M showed the best performance of all tested cation exchange resins, and the separation of PEGylated lysozyme could be also scaled up to semi-preparative level...

..These studies demonstrated the feasibility of PEGylating rh-ngEpo as a promising way for the development of new Epo drugs...

..This resulted in a high labelling efficiency of DOTA-peptides at high specific activity (SA) with short synthesis times...

..The advantages and disadvantages of two carboxylic acid columns of different cation-exchange capacities and different column formats will be discussed...

..A plausible mechanism for the extraction of Cu(II) has been suggested...

..abstract_text> ..

..S. Thus, there is an economic incentive to adopt novel antibiotics. ..

..S. Thus, there is an economic incentive to adopt novel antibiotics. ..

..The development of these methods will have a major impact on proteomics as well. ..

..Proteomics is a multidisciplinary research activity wherein separation science (including multidimensional HPLC and CE) and mass spectrometry will continue to play pivotal roles. ..

..abstract_text> ..

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..Such work has major implications for the de novo design of more effective antimicrobial agents. ..

..A. Sorkin) Design of peptide analogs/mimetic of the hormones bradykinin and substance P and cloning of the substance P receptor in rat brain. (J. M. Stewart) ..

..The development of these methods will have a major impact on proteomics as well. ..