Comparison of a Modified Folin Photometric Procedure and the Ninhydrin Manometric Method for the Determination of Amino Acid Nitrogen in Plasma

Chinard, Francis P.; Slyke, Donald D. Van

doi:10.1016/s0021-9258(17)30874-8

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…A typical run was as follows: 10 μL of the microfiltered sample was dissolved in 1 mL of water, to which 1 mL of ninhydrin acidic solution was added. This ninhydrin solution was prepared according to the literature. , An acidic solution was prepared by mixing 60 mL of a 6 M solution of phosphoric acid (85%, Alfa Aesar) and 40 mL of glacial acetic acid (99%, Cofarcas). Ninhydrin (200 mg) (puriss.…”

Section: Methodsmentioning

confidence: 99%

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l- and d-Proline Adsorption by Chiral Ordered Mesoporous Silica

Casado¹,

Castán²,

Gracia³

et al. 2012

Langmuir

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Chiral ordered mesoporous silica (COMS) was synthesized in the presence of amino acid proline by combining tetraethyl orthosilicate and quaternized aminosilane silica sources. The as-prepared materials were activated by calcination or microwave chemical extraction to remove the organic templates. The powder X-ray diffraction and N2 adsorption characterization revealed in COMS the structural and textural features of MCM-41-type silica. The chirality of the material was disclosed by mixed and separate l- and d-proline adsorption on the COMS prepared with l-proline (l-Pro-COMS) and d-proline (d-Pro-COMS). It was found that the maximum l-proline and d-proline adsorption capacities on l-Pro-COMS were ca. 2.3 and 0.6 mmol/g, respectively, while the adsorption of d-proline was higher than that of l-proline on d-Pro-COMS. Finally, both activation routes yielded enantioselective silicas able to separate proline racemate.

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Section: Methodsmentioning

confidence: 99%

“…This ninhydrin solution was prepared according to the literature. 32,33 An acidic solution was prepared by mixing 60 mL of a 6 M solution of phosphoric acid (85%, Alfa Aesar) and 40 mL of glacial acetic acid (99%, Cofarcas). Ninhydrin (200 mg) (puriss.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%