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Isoelectric

The swelling of gels is markedly affected by the presence of electrolytes, this effect being a minimum at the isoelectric point of the material. In general, sulphates, tartrates, etc. inhibit swelling, while iodides and thiocyanates promote the swelling. Thus gelatine disperses completely in iodide solution even at low temperatures. [Pg.382]

Figure V-8 illustrates that there can be a pH of zero potential interpreted as the point of zero charge at the shear plane this is called the isoelectric point (iep). Because of specific ion and Stem layer adsorption, the iep is not necessarily the point of zero surface charge (pzc) at the particle surface. An example of this occurs in a recent study of zircon (ZrSi04), where the pzc measured by titration of natural zircon is 5.9 0.1... Figure V-8 illustrates that there can be a pH of zero potential interpreted as the point of zero charge at the shear plane this is called the isoelectric point (iep). Because of specific ion and Stem layer adsorption, the iep is not necessarily the point of zero surface charge (pzc) at the particle surface. An example of this occurs in a recent study of zircon (ZrSi04), where the pzc measured by titration of natural zircon is 5.9 0.1...
One potentially powerfiil approach to chemical imaging of oxides is to capitalize on the tip-surface interactions caused by the surface charge induced under electrolyte solutions [189]. The sign and the amount of the charge induced on, for example, an oxide surface under an aqueous solution is detenuined by the pH and ionic strength of the solution, as well as by the isoelectric point (lEP) of the sample. At pH values above the lEP, the charge is negative below this value. [Pg.1714]

Table 27 2 includes a column labeled pi which is the isoelectric point of the ammo acid The isoelectric point, also called the isoionic point, is the pH at which the ammo acid has no net charge It is the pH at which the concentration of the zwitterion is a maximum At a pH lower than pi the ammo acid is positively charged at a pH higher than pi the ammo acid is negatively charged For the ammo acids m Table 27 2 pi is the average of pA i and pK 2 and lies slightly to the acid side of neutrality... [Pg.1118]

Some ammo acids have side chains that bear acidic or basic groups As Table 27 3 indicates these ammo acids are characterized by three values The third pK reflects the nature of the side chain Acidic ammo acids (aspartic and glutamic acid) have acidic side chains basic ammo acids (lysine arginine and histidine) have basic side chains The isoelectric points of the ammo acids m Table 27 3 are midway between the pK values of the zwitterion and its conjugate acid Take two examples aspartic acid and lysine Aspartic acid has an acidic side chain and a pi of 2 77 Lysine has a basic side chain and a pi of 9 74... [Pg.1118]

Thus if a mixture containing alanine aspartic acid and lysine is subjected to electrophoresis m a buffer that matches the isoelectric point of alanine (pH 6 0) aspartic acid (pi = 2 8) migrates toward the positive electrode alanine remains at the origin and lysine (pi =9 7) migrates toward the negative elec trode (Figure 27 3b)... [Pg.1120]

FIGURE 27 3 Application of electrophoresis to the separation of aspartic acid alanine and lysine according to their charge type at a pH corresponding to the isoelectric point (pi) of alanine... [Pg.1120]

The most stable structure of a neutral ammo acid is a zwitterion The pH of an aqueous solution at which the concentration of the zwitterion IS a maximum is called the isoelectric point (pi)... [Pg.1150]

Isobutyl group (Section 2 13) The group (CH3)2CHCH2— Isoelectric point (Section 27 3) pH at which the concentration of the zwittenonic form of an amino acid is a maximum At a pH below the isoelectric point the dominant species is a cation At higher pH an anion predominates At the isoelec tnc point the ammo acid has no net charge Isolated diene (Section 10 5) Diene of the type... [Pg.1287]

This table lists the and pi (pH at the isoelectric point) values of a-amino acids commonly found in proteins along with their abbreviations. The dissociation constants refer to aqueous solutions at 25°C. [Pg.1179]

Table 2. Isoelectric Points of Some Solids in Aqueous Media... Table 2. Isoelectric Points of Some Solids in Aqueous Media...
The basic flow sheet for the flotation-concentration of nonsulfide minerals is essentially the same as that for treating sulfides but the family of reagents used is different. The reagents utilized for nonsulfide mineral concentrations by flotation are usually fatty acids or their salts (RCOOH, RCOOM), sulfonates (RSO M), sulfates (RSO M), where M is usually Na or K, and R represents a linear, branched, or cycHc hydrocarbon chain and amines [R2N(R)3]A where R and R are hydrocarbon chains and A is an anion such as Cl or Br . Collectors for most nonsulfides can be selected on the basis of their isoelectric points. Thus at pH > pH p cationic surfactants are suitable collectors whereas at lower pH values anion-type collectors are selected as illustrated in Figure 10 (28). Figure 13 shows an iron ore flotation flow sheet as a representative of high volume oxide flotation practice. [Pg.50]

Sodium Poly(4-styrene sulfonate). The sol—gel processing of TMOS in the presence of sodium poly-4-styrene sulfonate (NaPSS) has been used to synthesize inorganic—organic amorphous complexes (61). These sodium siUcate materials were then isotherm ally crystallized. The processing pH, with respect to the isoelectric point of amorphous siUca, was shown to influence the morphology of the initial gel stmctures. Using x-ray diffraction, the crystallization temperatures were monitored and were found to depend on these initial microstmctures. This was explained in terms of the electrostatic interaction between the evolving siUcate stmctures and the NaPSS prior to heat treatment at elevated temperatures. [Pg.330]

Purified hGH is a white amorphous powder in its lyophilized form. It is readily soluble (concentrations >10 mg/mL) in dilute aqueous buffers at pH values above 7.2. The isoelectric point is 5.2 (3) and the generally accepted value for the extinction coefficient at 280 nm is 17,700 (Af-cm) (4),... [Pg.195]


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Acid (isoelectric) precipitation

Adsorption isoelectric point

Alanine isoelectric point

Alanine isoelectric point, calculation

Albumin isoelectric point

Aluminas isoelectric point

Aluminum hydroxide isoelectric point

Aluminum oxide isoelectric point

Amino Acids and the Henderson-Hasselbalch Equation Isoelectric Points

Amino acid isoelectric

Amino acids isoelectric point, calculation

Amino acids isoelectric point, determination

Amino acids isoelectric points

Amino isoelectric point

Ammonia isoelectric points

Ammonia isoelectric properties

Ampholytes isoelectric focusing

Ampholytes isoelectric point

Analytical isoelectric focusing

Antibody isoelectric point

Antigen modifications by isoelectric focusing

Apatite, isoelectric point

Applications in Isoelectric Focusing

Arginine isoelectric point

Asparagine isoelectric point

Aspartic acid isoelectric point

Box 11-2 What Is Isoelectric Focusing

Calcite, isoelectric point

Capillary Isoelectric Focussing (CIEF)

Capillary electrophoresis isoelectric focusing

Capillary isoelectric focusing

Capillary isoelectric focusing CIEF)

Capillary isoelectric focusing ampholyte buffers

Capillary isoelectric focusing applications

Capillary isoelectric focusing evaluation

Capillary isoelectric focusing hydrodynamic mobilization

Capillary isoelectric focusing isotachophoresis

Capillary isoelectric focusing mass spectrometry

Capillary isoelectric focusing principle

Capillary isoelectric focusing protein analysis

Capillary isoelectric focusing review

Capillary isoelectric focussing

Caramel isoelectric points

Carbon isoelectric point

Carrier ampholyte isoelectric focusing

Caseins, isoelectric points

Catalase isoelectric point

Catalysts isoelectric point

Cerebrospinal fluid isoelectric focusing

Chromatography isoelectric focusing

Collagen isoelectric point

Complexes isoelectric

Computer simulations isoelectric focusing

Copper oxide isoelectric point

Cysteine isoelectric point

Cytochrome isoelectric point

Density gradient electrophoresis isoelectric focusing

Electrokinetics isoelectric point

Electrophoresis and Isoelectric Focusing

Electrophoresis capillary isoelectric focussing

Electrophoresis isoelectric focusing

Electrophoresis isoelectric focussing

Electrostatic forces isoelectric point

Enzymic activities from isoelectric

Exchange isoelectric

Fibrinogen isoelectric point

Fractionation methods isoelectric focusing

Gelatin isoelectric

Gelatin isoelectric point

Gels isoelectric

Gels, isoelectric focusing

Glutamic acid isoelectric point

Glutamine isoelectric point

Glycine isoelectric point

Hematite, isoelectric point

Hemoglobin isoelectric point

Hemoglobin, isoelectric focusing

Histidine isoelectric point

Hypersensitive Measurement of Proteins by Capillary Isoelectric Focusing and Liquid Chromatography-Mass Spectrometry

I.e.p. = isoelectric point

Immobilized pH gradient isoelectric focusing

Iron isoelectric points

Iron oxide isoelectric point

Isoelectric Point Determination

Isoelectric Points and Electrophoresis

Isoelectric Points with Respect To Electrolyte Concentration

Isoelectric and Isoionic pH

Isoelectric band

Isoelectric focusing

Isoelectric focusing , humic substance

Isoelectric focusing and

Isoelectric focusing and isotachophoresis

Isoelectric focusing applications

Isoelectric focusing artifacts

Isoelectric focusing characterization

Isoelectric focusing charge standards

Isoelectric focusing considerations

Isoelectric focusing continuous flow

Isoelectric focusing definition

Isoelectric focusing density gradient

Isoelectric focusing development

Isoelectric focusing electrophoresis scale

Isoelectric focusing free solution

Isoelectric focusing gradients

Isoelectric focusing immobilized

Isoelectric focusing in polyacrylamide gel

Isoelectric focusing introduction

Isoelectric focusing mechanism

Isoelectric focusing of proteins

Isoelectric focusing parameters

Isoelectric focusing polyacrylamide gels

Isoelectric focusing preparative

Isoelectric focusing preparative electrophoresis

Isoelectric focusing properties

Isoelectric focusing protein recovery

Isoelectric focusing rehydratable gels

Isoelectric focusing separation power

Isoelectric focusing standardization

Isoelectric focusing synthetic carrier ampholytes

Isoelectric focusing transfer technique

Isoelectric focusing two-dimensional

Isoelectric focusing typing

Isoelectric focusing ultrathin-layer

Isoelectric focusing variants

Isoelectric focusing, IEF

Isoelectric focusing, description

Isoelectric focusing, high-resolution protein analysis

Isoelectric focusing, principles

Isoelectric focussing

Isoelectric focussing additives

Isoelectric focussing instrumentation

Isoelectric focussing methods

Isoelectric focussing preparative

Isoelectric focussing principle

Isoelectric focussing resolution

Isoelectric focussing techniques

Isoelectric fractionation

Isoelectric gelatin tricomplex flocculation

Isoelectric immobiline

Isoelectric immobilized

Isoelectric impurities

Isoelectric integral

Isoelectric molecules

Isoelectric overall charge

Isoelectric pH, of proteins

Isoelectric particle

Isoelectric peptide

Isoelectric point

Isoelectric point Langmuir

Isoelectric point The pH at which

Isoelectric point adhesion

Isoelectric point calculation

Isoelectric point colloid stability

Isoelectric point defined

Isoelectric point definition

Isoelectric point determining

Isoelectric point estimation

Isoelectric point for

Isoelectric point heat effect

Isoelectric point hydroxylation

Isoelectric point isotherm

Isoelectric point lysine, calculation

Isoelectric point metal oxides

Isoelectric point modifier effect

Isoelectric point of hair

Isoelectric point of lysozymes

Isoelectric point of proteins

Isoelectric point protein structure

Isoelectric point space charge potential

Isoelectric point supports

Isoelectric point suspensions

Isoelectric point table

Isoelectric point, 281 organic compounds

Isoelectric point, IEP

Isoelectric point, amphoteric surfactants

Isoelectric point, floes

Isoelectric point, glutathione

Isoelectric point, meat

Isoelectric point, of amino acids

Isoelectric point, protein solubility

Isoelectric point, silica surface

Isoelectric points particle materials

Isoelectric points, haemoglobins

Isoelectric precipitation

Isoelectric precipitation, casein

Isoelectric precipitation, protein

Isoelectric region

Isoelectric separation, distribution

Isoelectric serum transferrin

Isoelectric solution, definition

Isoelectric species

Isoelectric state

Isoelectric temperature

Isoelectric with

Isoelectrical ampholyte

Isoelectrical focusing

Isoforms isoelectric

Isoleucine isoelectric point

Leucine isoelectric point

Lysine isoelectric point

Lysozyme isoelectric point

Membranes isoelectric focusing

Minerals, isoelectric point

Molecular composition isoelectric focusing

Myoglobin isoelectric point

Myosin isoelectric point

Net Charge of a Particle The Isoelectric Point

Nonuniformly Charged Surface Layer Isoelectric Point

PH value of the isoelectric point

PH, isoelectric

Pepsin, isoelectric point

Peptide isoelectric point

Pi, isoelectric point

Polyacrylamide gel electrophoresis isoelectric focusing

Polyacrylamide gels carrier ampholyte isoelectric

Preparative isoelectric focusing in a density gradient

Preparative isoelectric focusing purification

Preparative solution isoelectric focusing

Proline isoelectric point

Protamine isoelectric point

Protein gels isoelectric point

Protein isoelectric point

Protein purification isoelectric focusing

Protein purification with isoelectric focusing

Proteins isoelectric

Proteins isoelectric focusing

Proteomics isoelectric focusing

Recycling isoelectric focusing

Separation techniques isoelectric focusing

Separations isoelectric focusing

Serine isoelectric point

Side chains. Isoelectric point. Electrophoresis

Silica isoelectric point

Silica, isoelectric point colloids

Silica, isoelectric point measurement

Silicon dioxide isoelectric point

Steady-State Variants of Sc Methods Isoelectric Focusing and Isopycnic Sedimentation

Surface isoelectric point

The Isoelectric Point

The Principles of Isoelectric Focusing

The isoelectric point of a protein

Thin-layer isoelectric focusing

Threonine isoelectric point

Titania isoelectric point

Titanium dioxide isoelectric point

Transferrin isoelectric point

Tryptophan isoelectric point

Two-dimensional procedures involving isoelectric focusing

Tyrosine isoelectric point

Urease isoelectric point

Valine isoelectric point

Wine proteins isoelectric point

Zirconia isoelectric point

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