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This study introduces a novel, sustainable method for measuring drug solubility, significantly reducing waste and energy consumption in pharmaceutical research. The new technique offers a thousandfold improvement in sensitivity, potentially cutting industry CO2 emissions by 3.5%.

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Area of Science:

  • Pharmaceutical Science
  • Green Chemistry
  • Materials Science

Background:

  • The pharmaceutical industry contributes significantly to global CO2 emissions, with drug discovery assays being major waste generators.
  • Current solubility measurement methods are either energy-intensive and slow (e.g., HPLC) or fast but inaccurate (e.g., turbidity).
  • There is a critical need for sustainable, accurate, and high-throughput methods in drug discovery.

Purpose of the Study:

  • To develop a novel, highly sensitive, and sustainable assay for measuring drug solubility and aggregation.
  • To reduce the environmental impact and CO2 footprint of pharmaceutical research and development.
  • To achieve a significant improvement in the detection limit for solubility measurements.

Main Methods:

  • Utilized high-throughput angle-resolved second harmonic scattering to detect nanoscale interfacial fluctuations.
  • Applied classical nucleation theory and nonlinear light scattering modeling to analyze solvent interfacial area changes.
  • Exploited the coherent nature of second harmonic emission for sensitive detection.

Main Results:

  • Demonstrated a thousandfold increase in sensitivity for solubility/aggregation detection, lowering the limit from ~1 μM to ~1 nM.
  • Established a correlation between solvent interfacial area fluctuations and aggregation onset.
  • Achieved a substantial sustainability gain in solubility assay methodology.

Conclusions:

  • The novel scattering-based method offers a highly sensitive, accurate, and sustainable alternative for solubility measurements.
  • This technique has the potential to significantly reduce the pharmaceutical industry's CO2 emissions by approximately 3.5%.
  • The findings pave the way for greener drug discovery and development processes.