Additives biodegradation

In addition, biodegradable nanoparticles for sustained release formulations to improve site-specific drug delivery has also been reviewed [98]. 

Figure 7. Conformations of the BHC (HCH) isomers and recent analogues of the aaaeee (lindane) structure, some of which have additional biodegradable groups (54)...

Additional biodegradable and thermosensitive polyphosphazenes derivatives, (I), were prepared by the author [1] in an earlier investigation. Thermosensitive cyclotriphosphazene analogues were also prepared by Sohn [2]. 

Keywords Active substances, additives, biodegradable systems, coated systems, dendrimers, environment sensitive systems, matrix diffusion systems, membrane controlled systems, micro, and nanoparticles, mucoadhesion... 

As poly(ethylenimine) (PEI) is one of the most widely studied non-viral vectors due to its high transfection ability, and much effort has been contributed to decrease its toxicity, we mainly focus on the current progress of PEI and its derivatives as the gene carrier. In addition, biodegradable polymers, which have gained increasing attention during the past decade for their reduced toxicity and prevention of polymer accumulation in the body, are also discussed. 

Modified cellulose of commercial significance involves primarily the cellulose esters and ethers. The cellulose esters include cellulose acetate, cellulose propionate, cellulose acetate-butyrate, cellulose nitrate. Cellulose ethers include ethyl cellulose as a melt, processable-grade and water-soluble derivatives. Historically, it was accepted that cellulose derivatives that had a degree of substitution above 1.0 were not biodegradable [18-20]. However, cellulose acetate has been found to be biodegradable in both aerobic compost and anaerobic bioreactor environments [21-23]. The potential for additional, biodegradable, cellulose derivatives is currently being explored. 

The starch-based polymers iiKlnde aritylose, lydroxyl-propylated starch and dextrin, polylactides (PLA), polyhydroxyalkanoate (PHA), polyhydroxybnterate (PHB), and a copolymer PHB and valeric acids (PHBAO- In addition, biodegradable films can also be formed from chitosan, which is derived finm the chitin of crastacean and insect... 

This chapter focuses on soy protein and starch-based green composites and discusses the effects of biodegradable resin modifications and fiber treatment on mechanical and chemical properties. In addition, biodegradation of green composites has been briefly described. 

---