Your Outsourcing Partner for Protein Research and Production Services

To meet the needs of our clients, Exon provides protein characterization of our expressed protein to insure the quality of recombinant protein.

Recombinant Protein Expression

Exon BioSystems is a protein contract research and production services company specializing in recombinant protein expression, protein purification, and protein characterization.

Antibody Engineering

Additional areas of expertise include assay development of G-protein coupled receptor, recombinant vaccine development and recombinant antibody production.

Biologics

Exon BioSystems is a protein contract research and production services company specializing in recombinant protein expression, protein purification, and protein characterization.

Particle Standards

Particle Structure:
Particle size standards are typically either crosslinked polymer or silica microspheres. Traditional particle size standards made of non-crosslinked polystyrene are only stable in aqueous dispersion and form aggregates upon drying. Crosslinked particles have much higher physical and chemical stability than non-crosslinked particles and can be stored as dry powder or aqueous dispersion.

Silica microspheres are designed for applications requiring additional rigidity and durability especially in organic solvents. The density of silica particles is much higher than that of the polymer particles. Under optical and electron microscopes, more contrast appears from the opaque silica particles than the polymer particles.

Nano-Micro supplies a full range of size standard microspheres based on patented particle technology. All of them are determined by Coulter Counter, DPS Disk Centrifuge, Dynamic Light Scattering, TEM, SEM, and Optical Microscope against Standard Reference Materials (SRMs) from the National Institute of Standards and Technology, U.S. Department of Commerce (NIST). The particle sizes of these microspheres are therefore traceable to globally recognized primary standards of NIST SRMs.

Size Standards.Submicron Particles on CPS Disk Centrifuge (Left) and Micron-sized particles on
Beckman Coulter Multisizer III (Right)

Product Characteristics:
  • Broad size range available from nano to micron-scale
  • Diverse material selection from different polymers and silica
  • Perfect roundness
  • Sharp particle size distribution
  • Stable physical and chemical properties

Product Applications:
Particles of uniform spheres and diameter have long been used as size references to estimate the sizes of other particulates, biomolecules, and living organisms. They can also be utilized to conduct routine calibration and checking of the performance of particle sizing instruments. In addition, QC and validation of analytical methods often depend on them to meet various requirements and regulations. To serve as a size reference, the particle size and size distribution of the monodisperse microspheres are determined by established standard methods. These well characterized size standards have become valuable in applications including microscopy, physical measurement of micron and submicron sizes, study of colloid systems and equipment efficiency.

Visit en.nanomicrotech.com for details.