title: Nanoparticle analysis of cancer cells by light transmission spectroscopy.
abstract: We have measured the optical properties of cancer and normal whole cells and lysates using light transmission spectroscopy (LTS). LTS provides both the optical extinction coefficient in the wavelength range from 220 to 1100nm and (by spectral inversion using a Mie model) the particle distribution density in the size range from 1 to 3000nm. Our current work involves whole cells and lysates of cultured human oral cells in liquid suspension. We found systematic differences in the optical extinction between cancer and normal whole cells and lysates, which translate to different particle size distributions (PSDs) for these materials. Specifically, we found that cancer cells have distinctly lower concentrations of nanoparticles with diameters less than 100nm and have higher concentrations of particles with diameters from 100 to 1000nm-results that hold for both whole cells and lysates. We also found a power-law dependence of particle density with diameter over several orders of magnitude.
authors.affiliation: Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA.
authors.forename: N
authors.initials: N
authors.lastname: Sun
authors.affiliation: Department of Chemistry and Biochemistry, Harper Cancer Research Institute, University of Notre Dame, Notre Dame, IN 46556, USA.
authors.forename: J
authors.initials: J
authors.lastname: Johnson
authors.affiliation: Department of Chemistry and Biochemistry, Harper Cancer Research Institute, University of Notre Dame, Notre Dame, IN 46556, USA.
authors.forename: M S
authors.initials: MS
authors.lastname: Stack
authors.affiliation: F Cubed, South Bend, IN 46617, USA.
authors.forename: J
authors.initials: J
authors.lastname: Szajko
authors.affiliation: Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA.
authors.forename: C
authors.initials: C
authors.lastname: Sander
authors.affiliation: Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA.
authors.forename: R
authors.initials: R
authors.lastname: Rebuyon
authors.affiliation: Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA.
authors.forename: A
authors.initials: A
authors.lastname: Deatsch
authors.affiliation: Ivy Tech, South Bend, IN 46601, USA.
authors.forename: J
authors.initials: J
authors.lastname: Easton
authors.affiliation: Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA.
authors.forename: C E
authors.initials: CE
authors.lastname: Tanner
authors.affiliation: Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA. Electronic address: sruggier@nd.edu.
authors.forename: S T
authors.initials: ST
authors.lastname: Ruggiero
mesh_terms: D045744:Cell Line, Tumor; D006801:Humans; D015603:Keratinocytes / Q000166:cytology / Q000473:pathology; D008027:Light; D009062:Mouth Neoplasms / Q000473:pathology*; D053758:Nanoparticles / Q000737:chemistry; D055620:Optical Phenomena; D010316:Particle Size; D012542:Scattering, Radiation; D013057:Spectrum Analysis
keywords: Light transmission spectroscopy; Lysates; Nanoparticles; Oral cancer; Submicron particle analysis