DIFFERENT PHYSICAL PROPERTIES OF FEW AMINO ACIDS FOR FIVE DIFFERENT TEMPERATURES IN AQUEOUS SODIUM ACETATE SOLUTION

This work is largely an extension of that already carried out on gelatin (Moran, 1926, 1932; Lloyd and Moran, 1934; and Hardy, 1926). These papers discussed ( a ) the crystal pattern and nature of the ice phase in frozen gels; ( b ) the amounts and nature of the water in equilibrium with unit mass of gelatin at different temperatures or activities of water. 1-Egg Albumin The egg albumin was prepared by Hopkins’s method, slightly modified as described by Adair and Robinson (1930). It was found that thorough washing with the solution prepared by adding 60 cc M sodium acetate solution and 40 cc of M acetate acid to 100 cc of saturated ammonium sulphate solution gave a sufficiently pure albumin since its water relations (as described later) were identical with those of an albumin recrystallized three times after this washing. The solution of albumin was dialysed under slight pressure at 0° C for several weeks until, in the final test, a 24-hour dialysate from approximately 60 cc of albumin solution, when concentrated to 1-2 cc, gave no reaction for sulphate. Several samples of concentrated albumin solution were prepared. The concentration (grams albumin per 100 grams of solution) varied from 20 to 33% with a ∆ consistent at about 0·025°; the p h as measured by the glass electrode was 4·8. The conductivity per 1% egg albumin never exceeded 2 x 10 -5 mhos.

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Structure of aqueous sodium acetate solutions by X-Ray scattering and density functional theory

Pure and Applied Chemistry ◽

10.1515/pac-2020-0402 ◽

2020 ◽

Vol 92 (10) ◽

pp. 1627-1641

Author(s):

Guangguo Wang ◽

Yongquan Zhou ◽

He Lin ◽

Zhuanfang Jing ◽

Hongyan Liu ◽

...

Keyword(s):

Sodium Acetate ◽

Density Functional ◽

Hydration Shell ◽

Ion Pair ◽

Water Molecules ◽

Sodium Acetate Solution ◽

Acetate Solution ◽

X Ray ◽

X Ray Scattering ◽

Ray Scattering

AbstractThe structure of aq. sodium acetate solution (CH3COONa, NaOAc) was studied by X-ray scattering and density function theory (DFT). For the first hydrated layer of Na+, coordination number (CN) between Na+ and O(W, I) decreases from 5.02 ± 0.85 at 0.976 mol/L to 3.62 ± 1.21 at 4.453 mol/L. The hydration of carbonyl oxygen (OC) and hydroxyl oxygen (OOC) of CH3COO− were investigated separately and the OC shows a stronger hydration bonds comparing with OOC. With concentrations increasing, the hydration shell structures of CH3COO− are not affected by the presence of large number of ions, each CH3COO− group binds about 6.23 ± 2.01 to 7.35 ± 1.73 water molecules, which indicates a relatively strong interaction between CH3COO− and water molecules. The larger uncertainty of the CN of Na+ and OC(OOC) reflects the relative looseness of Na-OC and Na-OOC ion pairs in aq. NaOAc solutions, even at the highest concentration (4.453 mol/L), suggesting the lack of contact ion pair (CIP) formation. In aq. NaOAc solutions, the so called “structure breaking” property of Na+ and CH3COO− become effective only for the second hydration sphere of bulk water. The DFT calculations of CH3COONa (H2O)n=5–7 clusters suggest that the solvent-shared ion pair (SIP) structures appear at n = 6 and become dominant at n = 7, which is well consistent with the result from X-ray scattering.

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Analytical Methods for Diethylstilbestrol in Feeds and Premixes

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/49.5.895 ◽

1966 ◽

Vol 49 (5) ◽

pp. 895-898

Author(s):

Loyal R Stone

Keyword(s):

Acetic Acid ◽

Analytical Methods ◽

Sodium Acetate ◽

Buffer System ◽

Official Method ◽

Sodium Acetate Solution ◽

Acetate Solution ◽

Acid Buffer System ◽

Acetic Acid Buffer

Abstract Methods are presented in which diethylstilbestrol is extracted from feeds in the Goldfisch apparatus, transferred into alkaline sodium acetate solution to avoid emulsions, and measured colorimetrically in a sodium acetate-acetic acid buffer system. The procedure is rapid, and results agree closely with those obtained by the official method. Procedures are also presented for determination of diethylstilbestrol in molasses and fat mixtures.

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The Basis of Bentazon Antagonism on Sethoxydim Absorption and Activity

Weed Science ◽

10.1017/s004317450007212x ◽

1989 ◽

Vol 37 (3) ◽

pp. 400-404 ◽

Cited By ~ 45

Author(s):

Gunawan Wanamarta ◽

Donald Penner ◽

James J. Kells

Keyword(s):

Sodium Salt ◽

Sodium Acetate ◽

Tomato Fruit ◽

Weak Acid ◽

Antagonistic Effect ◽

Hydroxyl Group ◽

Sodium Acetate Solution ◽

Acetate Solution ◽

Spray Solution ◽

Leaf Surfaces

The antagonistic effect of bentazon on sethoxydim adsorption and activity was studied in quackgrass. The diffusion of14C-sethoxydim into and through an isolated tomato fruit cuticle was inhibited in the presence of the sodium salt of bentazon. Bentazon also increased the partitioning of14C-sethoxydim into CH2Cl2and water; however, it decreased partitioning into ethyl acetate. Removal of epicuticular wax from quackgrass leaf surfaces did not prevent the antagonism. Addition of sodium acetate or sodium bicarbonate to the sethoxydim spray solution at 10 mM reduced uptake of14C-sethoxydim by quackgrass similar to the effect of bentazon. Sodium ions in the bentazon formulation appeared responsible for the antagonism by exchanging with the H+of the sethoxydim hydroxyl group to form a more polar sodium salt of sethoxydim. The addition of Li+, K+, Cs+, Ca++, and Mg++cations associated with a weak acid also reduced14C-sethoxydim absorption. Addition of organic acids to the spray solution overcame the antagonism by preventing the formation of sodium salt of sethoxydim. In the field, the addition of a 3000 ppm sodium acetate solution delivering 0.56 kg/ha produced the same antagonism as bentazon on quackgrass control with sethoxydim.

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