scholarly journals Effect of Albumin and Detergent on the Reduction of NBT by 1-Deoxy-1-Morpholinofructose

1989 ◽  
Vol 26 (6) ◽  
pp. 496-499 ◽  
Author(s):  
E Podzorski ◽  
F E Wells
Keyword(s):  
Molecular Weight ◽  
Glycated Albumin ◽  
Low Molecular Weight ◽  
Albumin Concentration ◽  
Protein Matrix ◽  
Detergent Concentration ◽  
Low Concentration ◽  
Cationic Detergent ◽  
Kinetic Effects

The effect of matrix albumin concentration on reduction of NBT by DMF has been investigated together with the effect of cationic additives. Decreased albumin concentration and increased cationic detergent concentration both increased the sensitivity of the assay due to kinetic effects, but addition of a low molecular weight cation had no effect. The reduction of NBT by glycated albumin was not increased in sensitivity by a protein matrix of low concentration. Due to the complexity and poorly understood nature of interaction between DMF and albumin in the reduction of NBT, the authors do not consider DMF to be a suitable primary calibrant for the fructosamine assay.

Low Molecular Weight Sunflower Protein Hydrolysate with Low Concentration in Aromatic Amino Acids

1996 ◽  
Vol 44 (4) ◽  
pp. 967-971 ◽  
Author(s):  
Juan Bautista ◽  
Inmaculada Hernandez-Pinzon ◽  
Manuel Alaiz ◽  
Juan Parrado ◽  
Francisco Millan
Keyword(s):  
Amino Acids ◽  
Molecular Weight ◽  
Protein Hydrolysate ◽  
Aromatic Amino Acids ◽  
Low Molecular Weight ◽  
Low Concentration ◽  
Sunflower Protein

scholarly journals Use of Tri-Chloroacetic Acid /Acetone/polyethylene glycol for protein purification from HIV-1 infected human plasma

2019 ◽  
Author(s):  
Sushanta Kumar Barik ◽  
Keshar Kunja Mohanty ◽  
Deepa Bisht ◽  
Partha Sarathi Mohanty ◽  
Shripad Patil ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Polyethylene Glycol ◽  
Protein Purification ◽  
Human Plasma ◽  
Water Soluble ◽  
Low Molecular Weight ◽  
High Concentration ◽  
Low Concentration ◽  
Low Molecular Weight Proteins ◽  
Hiv 1

Abstract Human plasma contains high amount of abundant proteins like albumin and globulin. Normally, the proteins having potential for biomarkers are present in very low concentration in human plasma. To resolve the low concentration proteins in polyacrylamide gel, the removal of high abundant proteins from plasma are very essential. Polyethylene glycol is a nontoxic, water soluble synthetic polymer has several applications in chemical and biomedical industries. Various molecular variants of poly ethylene glycol is available and used in protein purification. The mechanism behind the use of high concentration of polyethylene glycol is it binds the molecule in more compact or interpenetrates forming a gel like network surrounding the molecule. Polyethylene glycol -6000 removes the high abundant proteins like Albumin and Globulin in the HIV -1 infected plasma samples and concentrates the low molecular weight proteins as the low molecular weight proteins are essential in biomarker study.

Improving data quality and expanding BioSAXS experiments to low-molecular-weight and low-concentration protein samples

2020 ◽  
Vol 76 (10) ◽  
pp. 971-981
Author(s):  
Albert Castellví ◽  
Carlos Pascual-Izarra ◽  
Eva Crosas ◽  
Marc Malfois ◽  
Judith Juanhuix
Keyword(s):  
Molecular Weight ◽  
Data Quality ◽  
Radiation Damage ◽  
Radical Scavenging ◽  
Extreme Case ◽  
Quality Data ◽  
Low Molecular Weight ◽  
Low Concentration ◽  
Critical Dose ◽  
Nitrogenous Base

The addition of compounds to scavenge the radical species produced during biological small-angle X-ray scattering (BioSAXS) experiments is a common strategy to reduce the effects of radiation damage and produce better quality data. As almost half of the experiments leading to structures deposited in the SASBDB database used scavengers, finding potent scavengers would be advantageous for many experiments. Here, four compounds, three nucleosides and one nitrogenous base, are presented which can act as very effective radical-scavenging additives and increase the critical dose by up to 20 times without altering the stability or reducing the contrast of the tested protein solutions. The efficacy of these scavengers is higher than those commonly used in the field to date, as verified for lysozyme solutions at various concentrations from 7.0 to 0.5 mg ml−1. The compounds are also very efficient at mitigating radiation damage to four proteins with molecular weights ranging from 7 to 240 kDa and pH values from 3 to 8, with the extreme case being catalase at 6.7 mg ml−1, with a scavenging factor exceeding 100. These scavengers can therefore be instrumental in expanding BioSAXS to low-molecular-weight and low-concentration protein samples that were previously inaccessible owing to poor data quality. It is also demonstrated that an increase in the critical dose in standard BioSAXS experiments leads to an increment in the retrieved information, in particular at higher angles, and thus to higher resolution of the model.

The Separation of High and Low Molecular Weight RNA by Precipitation with N-Cetyl- N,N,N-trimethyl-ammoniumbromide

1977 ◽  
Vol 32 (3-4) ◽  
pp. 294-296
Author(s):  
Gerhard Seibert ◽  
Barbara Schöbel ◽  
Rudolf K. Zahn
Keyword(s):  
Molecular Weight ◽  
Nucleic Acids ◽  
High Efficiency ◽  
Low Molecular Weight ◽  
5S Rna ◽  
Sedimentation Constant ◽  
Cationic Detergent ◽  
One Step

Abstract RNA with a sedimentation constant of 28S and 18S can easily be separated from 4S and 5S RNA. The method depends on the different solubulities of nucleic acids in solutions of the cationic detergent N-cetyl-N,N,N-trimethyl-ammoniumbromide at various ionic strengths. The separation can be achieved with high efficiency in one step.

A high-performance oil-free backing pump for electron microscopes

1978 ◽  
Vol 36 (1) ◽  
pp. 110-111
Author(s):  
G.K.W. Balkau ◽  
E. Bez ◽  
J.L. Farrant
Keyword(s):  
Molecular Weight ◽  
Electron Microscope ◽  
Hot Spots ◽  
High Performance ◽  
Carbonaceous Material ◽  
Contamination Rate ◽  
Low Molecular Weight ◽  
Principal Source ◽  
Rotary Pumps ◽  
Electron Microscopes

The earliest account of the contamination of electron microscope specimens by the deposition of carbonaceous material during electron irradiation was published in 1947 by Watson who was then working in Canada. It was soon established that this carbonaceous material is formed from organic vapours, and it is now recognized that the principal source is the oil-sealed rotary pumps which provide the backing vacuum. It has been shown that the organic vapours consist of low molecular weight fragments of oil molecules which have been degraded at hot spots produced by friction between the vanes and the surfaces on which they slide. As satisfactory oil-free pumps are unavailable, it is standard electron microscope practice to reduce the partial pressure of organic vapours in the microscope in the vicinity of the specimen by using liquid-nitrogen cooled anti-contamination devices. Traps of this type are sufficient to reduce the contamination rate to about 0.1 Å per min, which is tolerable for many investigations.

Low-molecular-weight heparin in the prevention and treatment of thromboembolic disorders

1998 ◽  
Vol 1 (5) ◽  
pp. 166-174 ◽  
Author(s):  
Evelyn R Hermes De Santis ◽  
Betsy S Laumeister ◽  
Vidhu Bansal ◽  
Vandana Kataria ◽  
Preeti Loomba ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Low Molecular Weight Heparin ◽  
Low Molecular Weight ◽  
Prevention And Treatment

Venous thromboembolism in a general hospital. An update with low molecular weight heparin prophylaxis

VASA ◽  
2007 ◽  
Vol 36 (1) ◽  
pp. 17-22
Author(s):  
Schulz ◽  
Kesselring ◽  
Seeberger ◽  
Andresen
Keyword(s):  
Molecular Weight ◽  
Pulmonary Embolism ◽  
Venous Thromboembolism ◽  
Low Molecular Weight ◽  
Trauma Patients ◽  
Vte Prophylaxis ◽  
Vein Thrombosis ◽  
Patients At Risk ◽  
Hospital Stays ◽  
Event Rates

Background: Patients admitted to hospital for surgery or acute medical illnesses have a high risk for venous thromboembolism (VTE). Today’s widespread use of low molecular weight heparins (LMWH) for VTE prophylaxis is supposed to have reduced VTE rates substantially. However, data concerning the overall effectiveness of LMWH prophylaxis is sparse. Patients and methods: We prospectively studied all patients with symptomatic and objectively confirmed VTE seen in our hospital over a three year period. Event rates in different wards were analysed and compared. VTE prophylaxis with Enoxaparin was given to all patients at risk during their hospital stay. Results: A total of 50 464 inpatients were treated during the study period. 461 examinations were carried out for symptoms suggestive of VTE and yielded 89 positive results in 85 patients. Seventy eight patients were found to have deep vein thrombosis, 7 had pulmonary embolism, and 4 had both deep venous thrombosis and pulmonary embolism. The overall in hospital VTE event rate was 0.17%. The rate decreased during the study period from 0.22 in year one to 0,16 in year two and 0.13 % in year three. It ranged highest in neurologic and trauma patients (0.32%) and lowest (0.08%) in gynecology-obstetrics. Conclusions: With a simple and strictly applied regimen of prophylaxis with LMWH the overall rate of symptomatic VTE was very low in our hospitalized patients. Beside LMWH prophylaxis, shortening hospital stays and substantial improvements in surgical and anasthesia techniques achieved during the last decades probably play an essential role in decreasing VTE rates.

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