Europium(III)-N,N′-Ethylenebis(L-amino acid) Complexes as New Chiral NMR Lanthanide Shift Reagents for Unprotectedα-Amino Acids in Neutral Aqueous Solution

2001 ◽  
Vol 74 (4) ◽  
pp. 707-715 ◽  
Author(s):  
Makoto Takemura ◽  
Kazuhiro Yamato ◽  
Matsumi Doe ◽  
Masaaki Watanabe ◽  
Hiroyuki Miyake ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Amino Acids ◽  
Amino Acid ◽  
Amino Acid Complexes ◽  
Neutral Aqueous Solution ◽  
Lanthanide Shift Reagents ◽  
Shift Reagents

ChemInform Abstract: Europium(III)-N,N′-ethylenebis(L-amino acid) Complexes as New Chiral NMR Lanthanoid Shift Reagents for Unprotected α-Amino Acids in Neutral Aqueous Solution.

ChemInform ◽  
2010 ◽  
Vol 32 (28) ◽  
pp. no-no
Author(s):  
Makoto Takemura ◽  
Kazuhiro Yamato ◽  
Matsumi Doe ◽  
Masaaki Watanabe ◽  
Hiroyuki Miyake ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Amino Acids ◽  
Amino Acid ◽  
Amino Acid Complexes ◽  
Neutral Aqueous Solution ◽  
Shift Reagents

Circular dichroism spectra of amino acid complexes. II. Chelated amino acid complexes with the CoN5O chromophore

1970 ◽  
Vol 23 (9) ◽  
pp. 1735 ◽  
Author(s):  
CJ Hawkins ◽  
PJ Lawson
Keyword(s):  
Amino Acids ◽  
Circular Dichroism ◽  
Amino Acid ◽  
Visible Region ◽  
Optically Active ◽  
Circular Dichroism Spectra ◽  
Amino Acid Complexes ◽  
Similar Series ◽  
Cotton Effects ◽  
Circular Dichroïsm

The circular dichroism spectra of a series of optically active (α-aminocarboxylato)tetraamminecobalt(111) complexes have been measured in aqueous solution, and in the presence of salts of polarizable anions. The observed spectra in the visible region have been analysed to determine the signs of the Cotton effects of the three components of the 1A1g ↔ 1T1g cobalt(111) transition. For L-amino acids, the transition with A2g(D4h) parentage is negative, and the two transitions with Eg(D4h) parentage have opposite signs. Published circular dichroism spectra of complexes of the type [Co(en)2(L-am)]2+ were similarly interpreted in terms of a perturbed tetragonal chromophore, and it was shown that the vicinal effect of the L-amino acids imposed the same signs onto the component transitions as for the tetraammines and for a similar series of pentaamminecobalt(111) complexes.

Enrichment of amino acids from its aqueous solution by ultrasonic atomization and ultrafine bubbles

2021 ◽  
Author(s):  
Keiji Yasuda ◽  
Koji Hamada ◽  
Yoshiyuki Asakura
Keyword(s):  
Aqueous Solution ◽  
Amino Acids ◽  
Amino Acid ◽  
Enrichment Factor ◽  
Acid Concentration ◽  
Flow Rate ◽  
Amino Acid Concentration ◽  
Solution Ph ◽  
Ultrasonic Atomization ◽  
Enrichment Characteristics

Abstract The enrichment characteristics of amino acids by ultrasonic atomization were investigated. Samples were aqueous solutions of L-phenylalanine and L-tyrosine. The ratio of amino acid concentration in the mist to that in the solution was defined as the enrichment factor. As the flow rate of carrier gas became higher, the collection mass of mist increased and the enrichment factor decreased. The enrichment factor depended on the solution pH. The enrichment factor increased with decreasing amino acid concentration in the solution and enhanced by the addition of ultrafine bubbles.

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