How does an antisolvent work?
Antisolvent crystallization achieves supersaturation and solidification by exposing a solution of the product to another solvent (or multiple ones) in which the product is sparingly soluble. The process can be semi-batch or continuous.
What is meant by Antisolvent?
antisolvent (plural antisolvents) (chemistry) A solvent in which the product is insoluble.
What is the supercritical antisolvent process?
Definition: A solid sample is dissolved in a common (organic or inorganic) solvent then injected into a supercritical fluid (held under pressure) resulting in a large decrease in solution density. This effect leads to the reduction in solubility of the solid and precipitation.
What is Antisolvent addition?
Antisolvent Addition: An Effective Method of Controlled Fluid Inclusion Formation in RDX Crystals | Crystal Growth & Design. ACS.
What is Antisolvent crystallization?
Anti-solvent crystallization, also known as precipitation, is a widely used technique in the pharmaceutical and fine chemical industry to recover a product from solution in a solvent in which the product has high solubility.
What temperature and pressure is used in supercritical fluid antisolvent method and why?
Further, it has high volatility, mild critical temperature (304°K), low critical pressure (7.38 MPa), low cohesive energy density, low polarizability per unit volume, and poor solubility for many polymers and drugs,8,10,13,15,16 and it has low viscosity like a gas, although its density is similar to that of a liquid.
What temperature and pressure is used in supercritical fluid anti solvent SAS method and why?
From Table 1 [2] it is clear that using supercritical (SC) CO2 as an antisolvent allows pure product to be generated at mild operating conditions because the critical temperature and pressure of carbon dioxide are 31.1°C and 7.38 MPa, respectively.
What is mother liquor in pharmaceutical industry?
The mother liquor (or spent liquor) is the solution remaining after a component has been removed by a some process such as filtration or more commonly crystallization. It is encountered in chemical processes including sugar refining.
What is purpose of recrystallization?
Recrystallization is the most important method of purifying nonvolatile organic solids. Recrystallization involves dissolving the material to be purified (the solute) in an appropriate hot solvent. As the solvent cools, the solution becomes saturated with the solute and the solute crystallizes out (reforms a solid).
What factors affect the particle size in antisolvent precipitation?
Stirring time is also an important factor to influence the particle size in the antisolvent precipitation process. When curcumin solution was added to purified water (antisolvent), small curcumin particles were formed immediately.
What is antisolvent nanoprecipitation?
Antisolvent nanoprecipitation is a simple but quite effective approach to produce nanoparticles of poorly water-soluble drugs. In order to explore the optimum conditions we have considered different process variables and particle size was observed after varying one parameter at a time, keeping other parameters constant.
What is the solvent and antisolvent used in filtration?
In the process, acetone and purified water were selected as solvent and antisolvent, respectively. Gelatin was used as stabilizer to inhibit the particle growth and control the particle morphology.
What is pre-precipitation?
Precipitation is a process initiated at the molecular level. When curcumin nanoparticles precipitated in the antisolvent, a hydrophobic surface was formed. The energy of the system increases. Because of the high surface energy of the newly formed nanoparticles, a stabilizing agent is needed which should cover the newly formed surface spontaneously.