Polyamide, microcapsule material

Microcapsules can be made to release their contents on exposure to light by incorporating into the core of the microcapsule a material that photochemically eliminates a gaseous product. Mathiowitz and Raziel have described such system, which involves polyamide microcapsules prepared by interfadal polycondensation of... 

Liver. The liver performs a wide variety of chemical reactions in the body and is the main locus of detoxification. Successful liver transplantation is somewhat rare, and no true artificial liver seems likely in the near future. The process of hemoperfusion, which is sometimes termed an artificial liver, can be used to supplement or relieve the normal liver functions for short time periods. In this technique, the patient s blood is passed through a column or bed of some sorbent material that removes toxic chemicals from the blood. This technique is often used in cases of drug overdose, poisoning, and acute hepatitis. The sorbent material can be charcoal, ion-exchange resins, immobilized hepatic material, or liver material enclosed in artificial cells (microcapsules, usually made from a polyamide). The column is usually a plastic material, and plastic tubing is used to direct the blood flow to and from the device ( 1, 57, M). 

In order to prepare the microcapsule with expected structure, the chosen polymer wall material should match with the core material. The affinity interaction between the polymer wall and the core material can determine the structure of the microcapsule. Highly cross-linked polyurea and polyurethane can form so-called compact capsules with 2-methylbenzothiazole homogeneously distributed in the polymer matrix, while in the case of polyamide core-shell structure capsules were... 

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