In-Situ Fiber Optic UV-Vis Spectrometer for Dissolution, Absorption, Flux and Solubility Studies
Know More Sooner
Predict how a drug will be released in the body prior to animal studies.
Make Informed Decisions
Abandon or optimize lead compounds with confidence.
Quick Results
Sample measurement can be obtained in less than 5 seconds.

The In-Situ UV Probe-Based Dissolution System
The Rainbow R6 provides concentration measurements in real time.
Removing delays between sample draw and analysis, the Rainbow R6 produces consistent, replicable results, whatever the media.
A sample measurement can be obtained in less than 5 seconds for each vessel, enabling unattended, extended assays. This provides the enriched data for very short sampling intervals required for immediate release formulations.
Improve Process and Decision Making with Better In Vitro Insights.
The Rainbow R6 is the core technology in Pion’s portfolio of dissolution solutions for:
Dissolution testing
Drug solubility
Dissolution Monitoring
Just add a small volume dissolution tester to your Rainbow R6
MicroDISS
Small volumes of 2- 20 ml
MiniDISS
Biorelevant volumes of 100-250 ml
Absorption and Flux Assays
Just add FLUX apparatus to your Rainbow R6
MicroFLUX
Using only several milligrams of sample for early-stage development where sample is limited
BioFLUX
At biorelevant volumes (200-250mL) for late stage formulation development
MacroFLUX
For a 900mL vessel of a USP II apparatus designed for use in formulation development based on standard USP dissolution setups
Software for the Rainbow R6
Pion Predictor
An enhanced data processing and management platform that allows you to analyze dissolution and flux data to get dissolution rates, precipitation kinetics, and predicted fraction absorbed ratio.
AuPRO
A powerful analytical software designed specifically for the needs of early stage compound screening and during pre-formulation and formulation development.
DissoPRO
A secure, traceable software package designed to address the needs of dissolution scientists and quality groups in highly regulated environments.