Radial Flow System for cell-based exposure

This is a high-end exposure system for the direct exposure of cell culture inserts or Petri dishes. The modular system consists of two main parts, the aerosol-guiding module and the sampling module housing the cell culture inserts, or Petri dishes.

The aerosol-guiding module can be fitted tightly to the sampling module, thus realizing a close connection between the two parts before exposure. The sampling module houses three cell culture inserts (or Petri dishes), which can be separately supplied with medium.

An optimal installation of the CULTEX® LTC module inside an incubator can be achieved by using the special designed CULTEX® LTC Rack. It takes up to four modules, which can be run in parallel. The construction guarantees a horizontal position of the cultivation unit thus providing comparable medium levels in all culture inserts.An optimal installation of the CULTEX® LTC module inside an incubator can be achieved by using the special designed CULTEX® LTC Rack. It takes up to four modules, which can be run in parallel. The construction guarantees a horizontal position of the cultivation unit thus providing comparable medium levels in all culture inserts.

The modular concept of CULTEX® product solutions allows simple, investment-safe upgrading of the CULTEX® RFS with a wide range of enhancement systems:

  • CULTEX® EDD Module – well-engineered Electrical Deposition Device to increase the deposition efficiency for micro-sized and nano-sized particles
  • CULTEX® DG Module – our Dust Generator recommended as essential peripheral equipment for the exposure of cells to dry powder aerosols
  • CULTEX® HyP Module – our high-precision Hydraulic Press for the production of homogeneous dust cakes for uniform aerosol generation and reproducible results
  • CULTEX® Insertomat – a helpful device for the excision of the delicate microporous membranes from cell culture inserts for histopathology
  • CULTEX® Process Plate – facilitates the processing of Falcon® and Transwell® inserts


CULTEX® RFS – the recipient of several awards

The cell culture reactor CULTEX® RFS has already received the Dr. Rudolf Eberle Prize, the innovation prize awarded by the State of Baden-Württemberg. As emphasized in the laudatory speech, this prize represents the recognition of new technological developments of the highest standard. The precision system manufactured from the highest quality materials is in the meantime also being successfully used in a project to test the method for direct exposure of cells, in which various research groups are assessing the stability, reproducibility and validity of the method on different sized particles up to nanoparticles, to establish fundamental legally recognized principles for a testing system.

Exposure systems

General features

  • Direct exposure technology at the air-liquid interface of
    cell cultures
  • Cellular systems: cell lines and primary cells from the
    respiratory tract as mono- or co-cultures
  • Test compounds
    • Gases
    • Particles (fine to nanoparticles)
    • Complex mixtures (e.g. tobacco smoke)
  • Application areas
    • Industrial chemicals (particulate & gaseous compounds)
    • Consumer products
    • Tobacco smoke
    • E-cigarette vapor
    • Pharmaceutical and therapeutic products
    • Pesticides
    • In- and outdoor analysis
  • Clients
    • Universities
    • Regulatory Bodies
    • Military
    • Pharmaceutical, chemical and tobacco industry
    • Contract research laboratories

Basic principles of the exposure systems

Module design

  • Inlet adapter
  • Exposure top – Aerosol guiding module
  • Base module – Sampling module
  • Socket module
  • Locking module


  • Use of the system with or without dilution

Test atmosphere

  • One sampling point
  • Radial flow system
  • Homogenous distribution of the test atmosphere to the surface of the cells
  • Reproducible deposition of the particles on the cell surface
  • Establishment of dose-response relationships
  • Repeated exposure studies

Biological test system


  • Maintenance of cell viability
    • 37° C by a temperature-controlled flow of water
    • Medium supply from below the insert membrane
      (static, intermittent, continuous)
  • Application of 6.5 mm, 12 mm and 24 mm Falcon®
    or Transwell® inserts via special adapters


  • Special adapter for 35 mm Petri dishes for running a modified Ames assay

Air-liquid interphase – in vitro exposure

Exposure systems – CULTEX® RFS – Radial Flow System

  • Flexible design of the exposure top with aerosol inlets for
    commercial available membrane inserts (Falcon®/Transwell®)
    of different size and 35 mm Petri dishes
  • 3 exposure positions
  • Individual exposure chambers (3 membrane inserts)
  • Tempering of the exposure chambers
  • Individual medium supply of the independent exposure
alert('Enter your js here!');
  • May 14, 2013

    IVTIP 2013, Southhampton

    „Prevalidation of the CULTEX® method (BMBF project 0315710): The air-liquid interface exposure of human lung cells in the CULTEX® Radial Flow System (RFS)”

    N. Möhle, D. Steinritz, C. Pohl, S. Hoffmann, M. Aufderheide

    Download poster

  • February 7, 2013

    BioMed Research International 2013; 2013:73413

    “The CULTEX® RFS: a comprehensive technical approach for the in vitro exposure of airway epithelial cells to the particulate matter at the air-liquid interface”

    M. Aufderheide, B. Halter, N. Möhle, D. Hochrainer

  • September 1, 2011

    Eurotox 2011, Paris

    “Importance of biomaterials testing prior to the construction of devices for in vitro techniques”

    J. Rach, M. Aufderheide

    Download poster

  • September 1, 2011

    Eurotox 2011, Paris

    „Prevalidation of the CULTEX® method: in vitro analysis of the acute toxicity of inhalable fine dusts and nanoparticles after direct exposure of cultivated human cells from the respiratory tract”

    C. Pohl, N. Möhle, M. Papritz, D. Steinritz, U. Mohr, S. Hoffmann, C.J. Kirkpatrick, M. Aufderheide

    Download poster

  • September 1, 2011

    Journal of Water and Health 2011; 9:586-596

    “Application of an optimized system for the well-defined exposure of human lung cells to trichloramine and indoor pool air”

    C. Schmalz, H. G. Wunderlich, R. Heinze, F.H. Frimmel, C. Zwiener, T. Grummt


Radial Flow System for cell-based exposure


CULTEX® Company Brochure



By continuing to use the site, you agree to the use of cookies. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.