Barnase encapsulation into submicron porous CaCO3 particles – studies of loading and enzyme activity

2021 ◽  
Author(s):  
Alexey Yashchenok ◽  
Olga Gusliakova ◽  
Elena Konovalova ◽  
Marina V. Novoselova ◽  
Viktoria Shipunova ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Calcium Carbonate ◽  
Porous Calcium Carbonate ◽  
Co Precipitation

The present study focuses on the immobilization of bacterial ribonuclease Barnase (Bn) into submicron porous calcium carbonate (CaCO3) particles. For encapsulation, we apply adsorption, freezing-induced loading and co-precipitation methods and...

Adsorption of anionic and cationic polymers on porous and non-porous calcium carbonate surfaces

1994 ◽  
Vol 75 (1-4) ◽  
pp. 197-203 ◽  
Author(s):  
Robert B. Bjorklund ◽  
Hans Arwin ◽  
Lars Järnström
Keyword(s):  
Calcium Carbonate ◽  
Cationic Polymers ◽  
Porous Calcium Carbonate

Calcium Carbonate and Cellulose/Calcium Carbonate Composites: Synthesis, Characterization, and Biomedical Applications

2016 ◽  
Vol 875 ◽  
pp. 24-44
Author(s):  
Ming Guo Ma ◽  
Shan Liu ◽  
Lian Hua Fu
Keyword(s):  
Calcium Carbonate ◽  
Biomedical Applications ◽  
Value Added ◽  
Functional Materials ◽  
Industrial Applications ◽  
Precipitation Method ◽  
Synthesis Methods ◽  
Water Pretreatment ◽  
Potential Applications ◽  
Co Precipitation

CaCO3 has six polymorphs such as vaterite, aragonite, calcite, amorphous, crystalline monohydrate, and hexahydrate CaCO3. CaCO3 is a typical biomineral that is abundant in both organisms and nature and has important industrial applications. Cellulose could be used as feedstocks for producing biofuels, bio-based chemicals, and high value-added bio-based materials. In the past, more attentions have been paid to the synthesis and applications of CaCO3 and cellulose/CaCO3 nanocomposites due to its relating properties such as mechanical strength, biocompatibility, and biodegradation, and bioactivity, and potential applications including biomedical, antibacterial, and water pretreatment fields as functional materials. A variety of synthesis methods such as the hydrothermal/solvothermal method, biomimetic mineralization method, microwave-assisted method, (co-) precipitation method, and sonochemistry method, were employed to the preparation of CaCO3 and cellulose/CaCO3 nanocomposites. In this chapter, the recent development of CaCO3 and cellulose/CaCO3 nanocomposites has been reviewed. The synthesis, characterization, and biomedical applications of CaCO3 and cellulose/CaCO3 nanocomposites are summarized. The future developments of CaCO3 and cellulose/CaCO3 nanocomposites are also suggested.

Morphology-Controlled CaCO3 Nanostructures by Modified Co-Precipitation in Pulsed Mode

2015 ◽  
Vol 752-753 ◽  
pp. 148-153
Author(s):  
M.M. Nassar ◽  
Taha Ebrahiem Farrag ◽  
M.S. Mahmoud ◽  
Sayed Abdelmonem
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
Rotation Speed ◽  
Average Particle Size ◽  
Calcium Nitrate ◽  
Precipitation Method ◽  
Average Particle ◽  
X Ray ◽  
Co Precipitation ◽  
Pulsed Mixing

Calcium carbonate nanoparticles and nanorods were synthesized by precipitation from saturated sodium carbonate and calcium nitrate aqueous solutions through co precipitation method. A new rout of synthesis was done by both using pulsed mixing method and controlling the addition of calcium nitrate. The effect of the agitation speed, and the temperature on particle size and morphology were investigated. Particles were characterized using X-ray Microanalysis, X-ray analysis (XRD) and scanning electron microscopy (SEM). The results indicated that increasing the mixer rotation speed from 3425 to 15900 (rpm) decreases the average particle size to 64±7 nm. A rapid nucleation then aggregation induced by excessive shear force phenomena could explain this observation. Moreover, by increasing the reaction temperature, the products were converted from nanoparticle to nanorods. The maximum attainable aspect ratio was 6.23 at temperature of 75°C and rotation speed of 3425. Generally, temperature raise promoted a significant homoepitaxial growth in one direction toward the formation of calcite nanorods. Overall, this study can open new avenues to control the morphology of the calcium carbonate nanostructures.

Method for Removal of Mercury from Oil Field Brine with Calcium Carbonate Co-precipitation

2014 ◽  
pp. 131-138 ◽  
Author(s):  
Farhad Fazlollahi ◽  
Mohammad Mehdi Zarei ◽  
Maryam Seied Habashi ◽  
Larry L Baxter
Keyword(s):  
Calcium Carbonate ◽  
Oil Field ◽  
Co Precipitation

CaCO3 Nanopowder Production by Co-Precipitation of Aerosols of Precursor Solutions of Na2CO3 and CaCl2

2020 ◽  
Vol 310 ◽  
pp. 41-46
Author(s):  
Sukhbaatar Enkhtor ◽  
Mongol Batpurev ◽  
Orgilsaikhan Gerelmaa ◽  
Sambuu Munkhtsetseg ◽  
Norovsambuu Tuvjargal ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Aqueous Solutions ◽  
Sem Analysis ◽  
Reaction Tube ◽  
Co Precipitation

Submicron-sized calcium carbonate (CaCO3) particles were prepared using an aerosol method in which two commercial air humidifiers containing 0.05 M of Na2CO3 and CaCl2 aqueous solutions were utilized as aerosol suppliers. Two streams of aerosols evaporated from the separate humidifiers were allowed to meet in 17-meter long, spiral reaction tube where collisions between two types of droplets containing precursor reagents leaded to grow of CaCO3 particles and precipitate onto the inner walls. XRD and SEM analysis revealed that CaCO3 particles were formed in calcite phase almost entirely.

Template-free synthesis of hierarchical porous calcium carbonate microspheres for efficient water treatment

RSC Advances ◽  
2016 ◽  
Vol 6 (1) ◽  
pp. 472-480 ◽  
Author(s):  
Jing Zhang ◽  
Bin Yao ◽  
Hang Ping ◽  
Zhengyi Fu ◽  
Yu Li ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Water Treatment ◽  
Potential Application ◽  
Hierarchical Porous ◽  
Template Free ◽  
Porous Calcium Carbonate

Hierarchical porous calcium carbonate microspheres are synthesized by a template-free method, and show potential application in water treatment.

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