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In situ DMSO hydration measurements of HTS compound libraries
1Labcyte Inc. (formerly Picoliter Inc.), 1190 Borregas Avenue, Sunnyvale, CA 94089, USA. ellson@labcyte.com
This study introduces a new way to measure how much water gets into DMSO solutions used in drug discovery experiments. DMSO is a common solvent for storing compounds in high-throughput screening (HTS), but it absorbs water from the air, which can damage the compounds. The researchers developed a non-destructive acoustic method to track water content in DMSO. They tested it against an optical method and found it to be accurate and reliable. They also showed that hydration rates depend on factors like plate format, solution volume, and lab humidity. The study helps scientists better manage compound storage by understanding and controlling hydration levels.
Area of Science:
- High-throughput screening in pharmaceutical research
- Analytical chemistry for compound stability
- Biological sample storage and preservation
Background:
HTS compound libraries are commonly stored in DMSO solutions, which are hygroscopic and prone to water absorption. Prior research has shown that water in DMSO can lead to compound degradation and precipitation, affecting screening outcomes. No prior work had resolved how hydration rates vary with storage conditions or plate formats. This gap motivated the development of a method to measure hydration in HTS-compatible ways. Understanding hydration is essential for maintaining compound stability. Existing methods are either destructive or incompatible with automation. This paper introduces a non-destructive acoustic approach. The study aims to bridge the gap between hydration monitoring and practical HTS workflows.
Purpose Of The Study:
The study aimed to develop a non-destructive method to measure water content in DMSO-based HTS compound solutions. It sought to compare this method with an optical technique for accuracy. The researchers wanted to determine hydration rates under various storage conditions. They also aimed to assess how well the acoustic method works with typical compound concentrations. The goal was to inform better storage practices for compound libraries. The study focused on hydration in different microplate formats and volumes. It addressed how environmental factors influence hydration rates. The findings could guide decisions on library handling and preservation.
Main Methods:
The researchers used an acoustic method to measure water content in DMSO solutions. They compared it with an optical technique for validation. The acoustic method was tested across DMSO solutions with 0% to 35% water by volume. They assessed accuracy and precision across this range. Time course studies tracked hydration in 384- and 1536-well plates. Variables included fluid volume, well geometry, and atmospheric conditions. The presence of HTS compounds at typical concentrations was also tested. The method was evaluated for compatibility with automation and high-throughput workflows.
Main Results:
The acoustic method showed accuracy and precision under 3% for DMSO solutions with 0% to 35% water. It was insensitive to HTS compounds at typical storage concentrations. Hydration rates varied with well geometry and fluid volume. Lower-volume fills in high-density plates hydrated faster. A 1536-well plate with 2μL of 100% DMSO absorbed over 6% water in one hour at 40% humidity. Hydration rates increased with larger humidity differentials. The acoustic method matched optical measurements closely. The findings suggest hydration is influenced by environmental and format-specific factors.
Conclusions:
The acoustic method is a reliable, non-destructive option for measuring DMSO hydration in HTS libraries. It performs well even with HTS compounds at typical concentrations. Hydration rates depend on well geometry, volume, and atmospheric conditions. High-density plates and low-volume fills hydrate more rapidly. Humidity differentials significantly affect hydration speed. The study shows hydration can be reversed, which is important for library management. The method supports better storage practices by enabling hydration monitoring. These findings help improve compound stability and screening reliability.
Frequently Asked Questions
The method uses acoustic signals to detect water content in DMSO solutions without altering them.
The acoustic method showed agreement with optical measurements and had accuracy under 3%.
Smaller volumes and higher-density plates allow faster water absorption from the environment.
Higher humidity differentials increase hydration rates in DMSO solutions stored in microplates.
The acoustic method is insensitive to HTS compounds at typical storage concentrations.
The findings suggest that hydration can be reversed, helping manage library stability and availability.