Commentary - Pharmaceutical Bioprocessing (2022) Volume 10, Issue 4

Biodegradable Polymers for Micro encapsulation of Drugs

Kinam Park*

Department of Pharmaceutics and Biomedical Engineering, Purdue University, 575 Stadium Mall Drive, West Lafayette, IN 47907, U.S.A.

*Corresponding Author:
Kinam Park Department of Pharmaceutics and Biomedical Engineering, Purdue University, 575 Stadium Mall Drive, West Lafayette, IN 47907, U.S.A.E-mail:

Received: 01-Jul-2022, Manuscript No. fmpb-22-50106; Editor assigned: 04- Jul-2022, PreQC No. fmpb- 22-50106 (PQ); Reviewed: 15- Jul-2022, QC No. fmpb-22-50106; Revised: 22-Jul-2022, Manuscript No. fmpb-22-50106 (R); Published: 29-Jul-2022 , DOI: 10.37532/2048- 9145.2022.10(4).67-69


Drug delivery has become more and more vital primarily thanks to the attention of the difficulties related to a range of recent and new medicine. Of the various chemical compound drug delivery systems, perishable polymers are used wide as drug delivery systems attributable to their biocompatibility and biodegradability. the bulk of perishable polymers are utilized in the shape of micro particles, from that the incorporated drug is discharged to the surroundings in an exceedingly controlled manner. The factors to blame for dominant the drug unleash rate square measure chemical science properties of medicine, degradation rate of polymers, and also the morphology and size of micro particles. This review discusses the standard and up to date technologies for microencapsulation of the medicine exploitation perishable polymers.


Microencapsulation technology• perishable chemical compound• drug delivery system.


Biodegradable polymers are applied as carriers for controlled delivery of low mass medicine similarly as bioactive proteins .Biodegradable polymers, either artificial or natural, square measure capable of being cleaved into biocompatible by merchandise through chemical or enzyme-catalysed chemical reaction [1]. This perishable property makes it doable to implant them into the body while not the requirement of consequent removal by the surgery. perishable chemical compound particles (e.g., microspheres, microcapsules, and nanoparticles) square measure extremely helpful as a result of they will be administered to a range of locations in vivo through a syringe needle .A variety of medicine, no matter their molecular weights and water solubility, is loaded into the perishable small particles exploitation totally different producing techniques [2].A few samples of perishable polymers utilized in small particle preparation embody polyesters ,poly anhydrides , poly phosphazenes and polysaccharides.


Preparation of microparticles exploitation perishable polymers, it’s vital to decide on associate acceptable encapsulation method that meets the subsequent necessities [3]. First, the chemical stability and biological activity of the incorporated medicine ought to be maintained throughout the encapsulation method. for instance, since most proteins square measure promptly denaturised upon contact with hydrophobic organic solvents or acidic/basic binary compound solutions, the method ought to avoid such harsh environments.The microparticles made ought to have the affordable size vary (< 250 μm) that may be administrated exploitation the syringe needle via the canal pathway. Fourth, the discharge profile of the drug ought to be consistent while not the many initial burst. There square measure variety of techniques out there for microencapsulation of medicine like the emulsionsolvent evaporation/extraction technique, spray drying, section separation-coacervation, surface deposition, and in place chemical change [4]. Every technique has its own benefits and drawbacks. the selection of a selected technique depends on the attributes of the chemical compound and also the drug, the positioning of the drug action, and also the length of the medical care. This technique has been primarily accustomed encapsulate hydrophobic medicine through oil-in-water (o/w) emulsification method. The chemical compound is dissolved in an exceedingly water-immiscible, volatile organic solvent like methylene chloride, and also the drug is dissolved or suspended into the chemical compound answer. The ensuing mixture is blended in a|during a|in associate exceedingly|in a very massive volume of water within the presence of an wetting agent. The solvent removal rate is set by the temperature of the medium, the solubility characteristics of the chemical compound, and also the solvent used. This technique, however, is merely out there for the hydrophobic medicine as a result of the deliquescent medicine could diffuse out or partition from the distributed oil section into the binary compound section, resulting in poor encapsulation efficiencies. The emulsification is disbursed exploitation either high speed homogenizers or sonicators. This primary emulsion is then transferred into associate excess quantity of water containing associate wetting agent below vigorous stirring, so forming a w/o/w emulsion. within the consequent procedure, the solvent is removed by either evaporation or extraction method. to the current mixture answer is additional associate organic nonsolvent (e.g., Si oil) below continuous stirring, by that the chemical compound solvent is step by step extracted and soft coacervate droplets containing the drug square measure generated. the speed of adding nonsolvent affects the extraction rate of the solvent, the scale of microparticles and encapsulation potency of the drug [5]. The ordinarily used nonsolvents embody silicone polymer oil, oil, light-weight liquid paraffin, and low-molecular-weight polybutadiene. The coacervate section is then hardened by exposing it into associate excess quantity of another nonsolvent like dissolvent, heptane, and inhalation anaesthetic. The characteristics of the ultimate microspheres square measure determined by the mass of the chemical compound, consistency of the nonsolvent, and chemical compound concentration. this system is promising for preparation of protein-loaded microcapsules. for instance, standard strategies of getting ready microparticles involve intensive exposure of proteins to the interface between binary compound and organic phases, to hydrophobic chemical compound matrix, and to acidic/basic microenviroments ensuing from degradation of the chemical compound. These unfavorable interactions square measure according to induce conformational changes of proteins. It shows sensible dependability, involves comparatively gentle conditions, permits dominant the particle size, and is a smaller amount obsessed with the solubility of the drug and also the chemical compound. The drug is dissolved or distributed within the chemical compound answer, within which volatile solvents. . The results indicated that the coating of the microsphere with water pill reduces the extent of aggregation and augments the yield of the merchandise. A refrigerant, non-aqueous method was accustomed prepare protein-loaded small particles during this technique, the liquid droplets of the polymer/drug answer square measure made through the spraying nozzle, collected in atomic number 7 containing frozen alcohol, and hardened by inserting them at -80oC wherever the solvent extraction happens. This technique is thought to encapsulate proteins into small particles while not important loss of their biological activity.



Conflict of Interest

No conflict of interest


  1. Cicek H, Tuncel A, Tuncel M et al. Degradation and drug release characteristics of monosize polyethylcyanoacrylate microspheres. J.  Biomater. Sci. Polym. Ed. 6, 845-856(1995).
  2. Indexed at, Google Scholar, Crossref

  3. Mi FL, Lin YM, Wu YB et al. Chitin/PLGA blend microspheres as a biodegradable drug-delivery system: phase-separation, degradation and release behavior. Biomaterials.23, 3257-3267(2002).
  4. Indexed at, Google Scholar, Crossref

  5. Zhang Y, Chu CC. In vitro release behavior of insulin from biodegradable hybrid hydrogel networks of polysaccharide and synthetic biodegradable polyester. J. Biomater. Appl. 16, 305-325(2002).
  6. Indexed at, Google Scholar, Crossref

  7. Abraham GA, Gallardo A, San Roman J et al. Polymeric matrices based on graft copolymers of PCL onto acrylic backbones for releasing antitumoral drugs. J. Biomed. Mater. Res. 64, 638-647(2003).
  8. Indexed at, Google Scholar, Crossref

  9. Calandrelli L, De Rosa G, Errico ME et al. Novel graft PLLA-based copolymers: potential of their application to particle technology. J Biomed Mater Res. 62, 244-253(2002).
  10. Indexed at, Google Scholar, Crossref