Dissociation Constants of Peptides. III. The Effect of Optical Configuration on the Infrared Spectra of Polyfunctional Peptides1a,b

1956 ◽  
Vol 78 (2) ◽  
pp. 366-368 ◽  
Author(s):  
Eric Ellenbogen
Keyword(s):  
Infrared Spectra ◽  
Dissociation Constants ◽  
Optical Configuration

Ligands with the “ONNN” Group as Chelating and Preconcentrating Substances of Heavy Metal Ions: Aroylhydrazone Derivatives from Di-2-Pyridyl Ketone

1986 ◽  
Vol 40 (7) ◽  
pp. 1058-1062 ◽  
Author(s):  
M. Garcia-Vargas ◽  
M. Belizón ◽  
M. P. Hernández-Artiga ◽  
C. Martinez ◽  
J. A. Pérez-Bustamante
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Absorption Spectra ◽  
Infrared Spectra ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Dissociation Constants ◽  
Ortho Position ◽  
Acidic Media ◽  
Tridentate Ligands

The synthesis of the electronic and infrared spectra of di-2-pyridyl ketone salicyloylhydrazone (DPKSH) and di-2-pyridyl ketone benzoylhy-drazone (DPKBH) is reported. Ultraviolet absorption spectra have been applied for determining the dissociation constants: DPKSH, pK1 = 3.5 and pK2 = 6.85; DPKBH, pK1 = 2.75 and pK2 = 10.6. These pK a values are interpreted as a function of the ortho-position of the OH group. Chelating properties of both tridentate ligands have been investigated. DPKSH forms a larger number of metal chelates in acidic media than does DPKBH. Also, it is concluded that DPKSH is a more suitable compound than DPKBH to preconcentrate and to determine heavy metal ion traces as it is inferred from the data obtained by flame AAS.

Infrared spectra of carbon monoxide on platinum, iridium and copper ; comparison of flat and rough surfaces

1981 ◽  
Vol 78 ◽  
pp. 927-932 ◽  
Author(s):  
F.J.C.M. Toolenaar ◽  
G.J. van der Poort ◽  
F. Stoop ◽  
V. Ponec
Keyword(s):  
Carbon Monoxide ◽  
Infrared Spectra ◽  
Rough Surfaces

Factors Influencing the Separation of Glu-Plasminogen Affinity Forms I and II by Affinity Chromatography

1984 ◽  
Vol 52 (03) ◽  
pp. 347-349 ◽  
Author(s):  
Daan W Traas ◽  
Bep Hoegee-de Nobel ◽  
Willem Nieuwenhuizen
Keyword(s):  
Affinity Chromatography ◽  
Dissociation Constants ◽  
Ionic Composition ◽  
Chloride Ions ◽  
Factors Influencing ◽  
Two Factors ◽  
Human Plasminogen

SummaryNative human plasminogen, the proenzyme of plasmin (E. C. 3.4.21.7) occurs in blood in two well defined forms, affinity forms I and II. In this paper, the feasibility of separating these forms of human native plasminogen by affinity chromatography, is shown to be dependent on two factors: 1) the ionic composition of the buffer containing the displacing agent: buffers of varying contents of sodium, Tris, phosphate and chloride ions were compared, and 2) the type of adsorbent. Two adsorbents were compared: Sepharose-lysine and Sepharose-bisoxirane-lysine. Only in the phosphate containing buffers, irrespective of the type of adsorbent, the affinity forms can be separated. The influence of the adsorbent can be accounted for by a large difference in dissociation constants of the complex between plasminogen and the immobilized lysine.

MODELING THE CONFORMATION-SPECIFIC INFRARED SPECTRA OF N-ALKYLBENZENES

2016 ◽  
Author(s):  
Daniel Tabor ◽  
Timothy Zwier ◽  
Joseph Korn ◽  
Daniel Hewett ◽  
Edwin Sibert
Keyword(s):  
Infrared Spectra
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