Colorimetric Estimation of Ultramicro Quantities of Calcium in Human Serum as Complex with Alizarin

Natelson, Samuel; Penniall, Ralph

doi:10.1021/ac60099a033

Cited by 31 publications

(13 citation statements)

References 28 publications

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“…In Figure 8 it is apparent that the values subsequently converge so that the albumin-formula group and the breastmilk group sho\v similar values at the end of the 32d day. The 9.-Plasma glucose levels for the infants on the three formulas during the experimental period. Standard deviations, , , " , are given for the groups on albumin formula, breast milk, and casein formula, respectively.…”

Section: Commentmentioning

confidence: 99%

Noncasein Protein to Casein Ratio of Feeding Formulas<subtitle>Effect on Blood Component Levels in Normal Infants</subtitle>

Natelson¹,

Penniall²,

Crawford³

et al. 1955

Arch Pediatr Adolesc Med

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Section: Commentmentioning

confidence: 99%

Noncasein Protein to Casein Ratio of Feeding Formulas<subtitle>Effect on Blood Component Levels in Normal Infants</subtitle>

Natelson¹,

Penniall²,

Crawford³

et al. 1955

Arch Pediatr Adolesc Med

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“…The best fitting curve has pK2' values differ from those calculated from been drawn through the points by inspection. Equation (8) by an amount which is a linear The values for ,3 ranged from -0.51 for mole function of ionic strength [Equation (9)]. This fraction 0.05 to -0.02 for mole fraction 0.7.…”

Section: Resultsmentioning

confidence: 99%

“…Inorganic sulfate was determined gravimetrically by the method of Folin (7). The sum of calcium and magnesium was measured by the method of Natelson and Penniall (8). Urines were prepared for organic acid titration by the method of Van Slyke and Palmer (9).…”

Section: Considerationsmentioning

confidence: 99%

The Influence of Urinary Ionic Strength on Phosphate Pk2′ and the Determination of Titratable Acid*

Schwartz¹,

Bank²,

Cutler³

1959

J. Clin. Invest.

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It is well recognized that the pK' value for the salt of a weak acid or base is significantly influenced by the ionic strength of the solution. In the case of phosphate, the theoretical value for pK2 in an infinitely dilute solution is 7.181 at 370 C. (1) and in a solution of ionic strength comparable to that of plasma is approximately 6.8.The small variations in ionic strength ordinarily encountered in plasma would not be expected to produce significant deviations from this latter value. However, in view of the wider range of ionic strengths which occurs in urine, values differing appreciably from 6.8 might be anticipated.In the present study an attempt has been made to evaluate the relationship between pK2' phosphate and ionic strength in urine, and to define the usual range of values which might be encountered in the course of acute phosphate loading experiments. A method has been devised for the determination of phosphate pK2' in urine and the experimental values have been compared with those for phosphate solutions of similar ionic strength. The data suggest that under the conditions of the present experiments the behavior of phosphate in urine conforms closely to that predicted for simple phosphate solutions by the Debye-Hfickel equation. It has further been demonstrated that the pK2' of phosphate in urine may vary significantly and that under some circumstances failure to consider this variation may introduce appreciable errors into either the measurement or calculation of urinary "titratable acid." THEORETICAL CONSIDERATIONS

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“…In particular, its clinical and industrial applications (textile dyes, biolabeling, optical device manufacturing, etc.) are major topics of recent researches [1][2][3][4][5][6][7][8]. It is also a popular pH indicator with color changes related to the (de)protonation of the -OH group in the C2 position.…”

Section: Introductionmentioning

confidence: 99%

“…It is also a popular pH indicator with color changes related to the (de)protonation of the -OH group in the C2 position. Interactions of different metal ions with Alizarin are used for a wide range of analytical processes such as trace metal extraction or quantification and also for biological application such as calcium ion assay [1][2][3]7]. Alizarin Red has low water solubility therefore in aqueous solution its sulphonated derivate (Alizarin Red S, ARS) is used.…”

Section: Introductionmentioning

confidence: 99%

Performance of exchange–correlation functionals on describing ground state geometries and excitations of Alizarin Red S: Effect of complexation and degree of deprotonation

Fehér

Purgel

Joó

2014

Computational and Theoretical Chemistry

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Ground state optimizations and excited state calculations were performed to analyze the possible anionic forms of Alizarin Red S(ulphonated) and its ML 2 type metal complexes formed with palladium(II). Six functionals have been tested (B3LYP, M06-2X, M06, BH&HLYP, PBE0, LC-wPBE, and CAM-B3LYP) with two basis sets (6-311+g(d,p) and TZVP). The relative errors of these functionals in reproducing the experimental UV-Vis absorption wavelengths are reported for the energetically lowest lying isomers. It was found that the degree of deprotonation affects several functionals in a systematic way. M06 and CAM-B3LYP xc-functionals gave the best estimates according to the average relative errors.These two functionals were then used to explore the coordination mode (hydroxy-keto or catechol) of the palladium(II) complexes and the effect of (de)protonation.

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Colorimetric Estimation of Ultramicro Quantities of Calcium in Human Serum as Complex with Alizarin

Cited by 31 publications

References 28 publications

Noncasein Protein to Casein Ratio of Feeding Formulas<subtitle>Effect on Blood Component Levels in Normal Infants</subtitle>

Noncasein Protein to Casein Ratio of Feeding Formulas<subtitle>Effect on Blood Component Levels in Normal Infants</subtitle>

The Influence of Urinary Ionic Strength on Phosphate Pk2′ and the Determination of Titratable Acid*

Performance of exchange–correlation functionals on describing ground state geometries and excitations of Alizarin Red S: Effect of complexation and degree of deprotonation

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