scholarly journals Preliminary Data on the Nanoscale Chemical Characterization of the Inter-Crystalline Organic Matrix of a Calcium Carbonate Biomineral

Minerals ◽  
2018 ◽  
Vol 8 (6) ◽  
pp. 223 ◽  
Author(s):  
Alberto Pérez-Huerta ◽  
Fernando Laiginhas
Keyword(s):  
Calcium Carbonate ◽  
Preliminary Data ◽  
Chemical Characterization ◽  
Organic Matrix

Preliminary Characterization of Organic Nucleator and Framework Macromolecules in Mollusc Shells

1993 ◽  
Vol 330 ◽  
Author(s):  
Richard Humbert ◽  
M. Sarikayat ◽  
I. A. Aksay ◽  
J. W. Crabb ◽  
C. E. Furlong
Keyword(s):  
Amino Acid ◽  
Calcium Carbonate ◽  
Organic Material ◽  
Organic Matrix ◽  
Shell Formation ◽  
Haliotis Rufescens ◽  
Nautilus Pompilius ◽  
Red Abalone ◽  
20 Nm

ABSTRACTThe nacreous (mother-of-pearl) sections of molluscan shells are natural laminates of aragonitic calcium carbonate platelets and an organic matrix. The multi-edged platelets are sub-micrometer thick and surrounded on all sides by 10–20 nm-thick organic matrix that contains several proteins and polysaccharides. Our goal is to identify the components and structure of the organic matrix and determine their function in shell formation and organization. We have extracted organic material from red abalone-Haliotis rufescens, and chambered nautilus-Nautilus pompilius. From the soluble portion, we have partially purified two proteins and determined their amino acid compositions.

Producing High Quality CaCO3 by Phosphogypsum with New Ammonia-Base Carbonation Method

2014 ◽  
Vol 628 ◽  
pp. 115-119 ◽  
Author(s):  
Jun Ma ◽  
Li Ping Ma ◽  
De Hua Zhang ◽  
Bei Yan ◽  
Long Zhou ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Phosphoric Acid ◽  
Metal Ion ◽  
Room Temperature ◽  
Chemical Characterization ◽  
Mass Ratio ◽  
High Quality ◽  
Titration Method ◽  
Application Requirements

Phosphogypsum is a by-product of industrial phosphoric acid producing with wet method, a simple and efficient way to produce high quality CaCO3by phosphogysum is presented in this work. Calcium in the phosphogypsum converts into Ca (OH)2with the addition of NaOH, acid insoluble substances and metal ion which was also separated from calcium in phosphogypsum by HCl and NH3·H2O respectively. The purity and whiteness of CaCO3produced by the carbonization of purified CaCl2solution are 98% and 96%. The optimum mass ratio of phosphogypsum, NaOH and HCl was 25:12:35. Chemical characterization of the resultant CaCO3was performed by XRD, SEM, TG and chemical titration method, which indicate that this method is effective in producing spherical CaCO3at room temperature, moreover, the purity, whiteness and thermostability of calcium carbonate can meet most of application requirements for industrial CaCO3.

PREPARATION AND CHARACTERIZATION OF ORGANIC MODIFIED CALCIUM CARBONATE BY SODIUM STEARATE (OR SODIUM OLEATE) USING WET METHOD

2020 ◽  
Vol 27 (10) ◽  
pp. 1950224
Author(s):  
YU LIANG ◽  
SIJIA SUN ◽  
HAO DING ◽  
XIFENG HOU
Keyword(s):  
Calcium Carbonate ◽  
Sodium Oleate ◽  
Large Scale ◽  
Sodium Stearate ◽  
Organic Matrix ◽  
Scale Production ◽  
Elongation At Break ◽  
Large Scale Production ◽  
The Cost

A method of modifying calcium carbonate particles was investigated by coating sodium stearate or sodium oleate on the surface of calcium carbonate by wet method. The results of FTIR, activation and dispersion index, dispersity in kerosene, surface wettability tests and zeta potential tests show that sodium stearate or sodium oleate has successfully coated on the surfaces of calcium carbonate. The main factors were researched and the optimal parameters were obtained for the best modification effect. Compared with common rubber, the modified calcium carbonate added rubber has larger breaking tensile strength (more than 21%) and larger elongation at break (more than 16%). This research provides a feasible way of modifying calcium carbonate for its use as filler in organic matrix, reduces the cost and has a potential application in large-scale production of modified calcium carbonate.

Olfactory and Chemical Characterization of Indoor Air-Towards a Psychophysical Model for Air Quality

1981 ◽  
Author(s):  
Birgitta Berglund ◽  
Ulf Berglund ◽  
Thomas Lindvall ◽  
Helene Nicander-Bredberg
Keyword(s):  
Air Quality ◽  
Indoor Air ◽  
Chemical Characterization

PURIFICATION AND PARTIAL CHEMICAL CHARACTERIZATION OF SHEEP NEUROPHYSIN

1973 ◽  
Vol 74 (2) ◽  
pp. 226-236 ◽  
Author(s):  
Michel Chrétien ◽  
Claude Gilardeau
Keyword(s):  
Amino Acid ◽  
Polyacrylamide Gel Electrophoresis ◽  
Chemical Characterization ◽  
Terminal Amino Acid ◽  
Amino Acid Determination ◽  
Pituitary Glands ◽  
Terminal Amino ◽  
Partial Chemical ◽  
Acid Determination

ABSTRACT A protein isolated from ovine pituitary glands has been purified, and its homogeneity assessed by NH2- and COOH-terminal amino acid determination, ultracentrifugation studies, and polyacrylamide gel electrophoresis after carboxymethylation. Its chemical and immunochemical properties are closely similar to those of beef and pork neurophysins, less similar to those of human neurophysins. It contains no tryptophan (like other neurophysins) or histidine (like all except bovine neurophysin-I and human neurophysins). It has alanine at the NH2-terminus and valine at the COOH-terminus. Its amino acid composition is similar to, but not identical with those of porcine and bovine neurophysins.

Laboratory Methods for the Physico-Chemical Characterization of Recombinant Allergens as Reference Standards

Alergologia ◽  
2020 ◽  
Vol 1 (4) ◽  
pp. 7
Author(s):  
Mariana Vieru ◽  
Florin-Dan Popescu ◽  
Laura Haidar ◽  
Carmen Bunu-Panaitescu
Keyword(s):  
Chemical Characterization ◽  
Reference Standards ◽  
Recombinant Allergens ◽  
Laboratory Methods ◽  
Physico Chemical
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