scholarly journals Complex formation constant of ferric ion with Gly, Pro-Hyp and Gly-Pro-Hyp

RSC Advances ◽  
2018 ◽  
Vol 8 (48) ◽  
pp. 27157-27162
Author(s):  
Mingyu Zhi ◽  
Yanan Li ◽  
Shella Permatasari Santoso ◽  
Fangyuan Chen ◽  
Guangrong Huang
Keyword(s):  
Complex Formation ◽  
Potentiometric Titration ◽  
Formation Constant ◽  
Ferric Ion ◽  
Complex Formation Constant ◽  
Ferric Ions

Potentiometric titration to determine the complex formation constant of ferric ions with Gly, Pro-Hyp and Gly-Pro-Hyp.

Advanced statistical evaluation of complex formation constant from electrophoretic data

2000 ◽  
Vol 407 (1-2) ◽  
pp. 327-336 ◽  
Author(s):  
Petr Barták ◽  
Petr Bednář ◽  
Lubomı́r Kubáček ◽  
Zdeněk Stránský
Keyword(s):  
Complex Formation ◽  
Formation Constant ◽  
Statistical Evaluation ◽  
Complex Formation Constant ◽  
Electrophoretic Data

scholarly journals Blue flower coloration of Corydalis ambigua requires ferric ion and kaempferol glycoside

2021 ◽  
Vol 85 (1) ◽  
pp. 61-68
Author(s):  
Kumi Yoshida ◽  
Takeya Oniduka ◽  
Kin-ichi Oyama ◽  
Tadao Kondo
Keyword(s):  
Emission Spectroscopy ◽  
Atomic Emission ◽  
Early Spring ◽  
Blue Flower ◽  
Ferric Ion ◽  
Ferric Ions ◽  
Kaempferol Glycoside ◽  
Cotton Effects ◽  
Blue Coloration ◽  
Exciton Type

Abstract Corydalis ambigua (Japanese name, Ezoengosaku) flowers bloom with blue to purplish petals in early spring in Hokkaido prefecture. In this study, a mechanism for blue petal coloration by ferric ions and keampferol glycoside was elucidated. Blue petals and cell sap exhibited similar visible (Vis) spectra, with λmax at approximately 600 nm and circular dichroism (CD) with positive exciton-type Cotton effects in the Vis region. Analysis of the organic components of the petals confirmed cyanidin 3-O-sambubioside and kaempferol 3-O-sambubioside as the major flavonoids. Mg, Al, and Fe were detected in petals using atomic emission spectroscopy. Color, Vis absorption, and CD consistent with those of blue petals were reproduced by mixing cyanidin 3-O-sambubioside, kaempferol 3-O-sambubioside, and Fe3+ in a buffered aqueous solution at pH 6.5. Both Fe3+ and flavonol were essential for blue coloration.

Reactions of ferrous and ferric ions with hydrogen peroxide. Part II.—The ferric ion reaction

1951 ◽  
Vol 47 (0) ◽  
pp. 591-616 ◽  
Author(s):  
W. G. Barb ◽  
J. H. Baxendale ◽  
P. George ◽  
K. R. Hargrave
Keyword(s):  
Hydrogen Peroxide ◽  
Ferric Ion ◽  
Ferric Ions

scholarly journals Divergent roles for ferric ions in the biological activity of amidated and non-amidated gastrins

2004 ◽  
Vol 181 (2) ◽  
pp. 315-325 ◽  
Author(s):  
J Pannequin ◽  
JP Tantiongco ◽  
S Kovac ◽  
A Shulkes ◽  
GS Baldwin
Keyword(s):  
Biological Activity ◽  
Inositol Phosphate ◽  
Peptide Hormone ◽  
Iron Chelator ◽  
Spectroscopic Studies ◽  
Jurkat Cells ◽  
Ferric Ion ◽  
Ferric Ions ◽  
Inositol Phosphate Production ◽  
Stimulation Of

Amidated forms of the peptide hormone gastrin act via the cholecystokinin-2 receptor to stimulate gastric acid secretion, whereas non-amidated forms stimulate colonic mucosal proliferation via a novel, as yet uncharacterised, receptor. Nuclear magnetic resonance (NMR) and fluorescence spectroscopic studies have revealed that glycine-extended gastrin17 bound two ferric ions, and that ferric ion binding was essential for biological activity. We have therefore investigated the role of ferric ions in the biological activity of amidated gastrin17. As with glycine-extended gastrin17, fluorescence quenching experiments indicated that Glu7 Ala and Glu8,9 Ala mutants of amidated gastrin17 each bound only one ferric ion. The affinity of the mutant peptides for the cholecystokinin-2 receptor on transfected COS-7 cells or on Tlymphoblastoid Jurkat cells, and their potency in stimulation of proliferation in Jurkat cells and inositol phosphate production in transfected COS-7 cells, were similar to the values obtained for amidated gastrin17. In addition, the iron chelator desferrioxamine did not significantly inhibit either binding of amidated gastrin17 to the cholecystokinin-2 receptor, or stimulation of inositol phosphate production by amidated gastrin17 in transfected COS-7 cells. We conclude that, in contrast to glycine-extended gastrin17, binding of ferric ions is not essential for the biological activity of amidated gastrin17. Our results support the concept of distinct modes of action for amidated and non-amidated gastrins, and raise the possibility of developing selective antagonists of the actions of non-amidated and amidated gastrins.

scholarly journals Unusual behavior of natural polyphosphates during IMAC

2013 ◽  
Vol 19 (No. 5) ◽  
pp. 161-165
Author(s):  
M. Kmínková ◽  
A. Prošková ◽  
J. Kučera
Keyword(s):  
Phytic Acid ◽  
Iron Content ◽  
Metal Ion ◽  
Ferric Ion ◽  
Ferric Ions ◽  
Unusual Behavior ◽  
Strong Bond ◽  
Hydrolysis Of ◽  
Chelating Groups ◽  
Metal Ion Affinity Chromatography

The atypical course of IDA-ferric (Imino-Di-Acetyl-agarose saturated with ferric ions) of two polyphosphorylated compounds – phytic acid and Ser(P)-Ser(P)-Ser(P)-Glu-Glu cluster obtained by the way of pancreatic hydrolysis of bovine casein was detected. The spectral data (for phytic acid) and iron content (for polyphosphate cluster) indicate the strong bond of ferric ions to these polyphosphorylated compounds. The data shows these compounds to bind ferric ion stronger even in comparison with IDA (Imino-Di-Acetate) itself. Therefore attention is to be paid to all IMAC (Immobilized-Metal-Ion-Affinity-Chromatography) of natural compounds containing strong chelating groups or several chelating groups in vicinity.

Extraction behavior of rutherfordium as a cationic fluoride complex with a TTA chelate extractant from HF/HNO3 acidic solutions

2018 ◽  
Vol 107 (1) ◽  
pp. 27-32 ◽  
Author(s):  
Akihiko Yokoyama ◽  
Yuta Kitayama ◽  
Yoshiki Fukuda ◽  
Hidetoshi Kikunaga ◽  
Masashi Murakami ◽  
...  
Keyword(s):  
Formation Constant ◽  
Chemical Species ◽  
Reversed Phase ◽  
Complex Formation Constant ◽  
Chemical Systems ◽  
Acidic Solutions ◽  
Extraction Behavior ◽  
Specific Complex ◽  
Specific Metal

Abstract The aim of this study was to identify relevant Rf chemical species by using reversed-phase extraction chromatography with 2-thenoyltrifluoroacetone (TTA) resin as the stationary phase. Because TTA can be used to extract specific metal ions, the distribution ratios of the system enabled determination of the specific complex formation constant of Rf. We performed several experiments on chemical systems with Zr, Hf, No, and Rf, determined their adsorption coefficients, and deduced the Kd values for Rf.

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