Extraction Optimization and Exploratory Antiproliferative Screening of a Coded Plant Material in MCF-7 Breast Cancer Cells
Ossama ArafatPURPOSE
Plant extracts are chemically complex preparations whose extraction yield may not predict biological response. This exploratory study evaluated the influence of extraction conditions on crude-extract yield and MCF-7 human breast adenocarcinoma cell response. The botanical material is reported under the confidential code NP to protect associated intellectual property.
METHODS
A D-optimal design evaluated 17 extraction conditions varying solvent, extraction time, temperature, agitation and solid-to-solvent ratio. Each extraction condition was performed in triplicate. Yield and extraction rate were determined, and MCF-7 cell biomass was assessed using the sulforhodamine B assay with triplicate wells. Partial least-squares modeling examined extraction-yield relationships. Biological-response modeling was considered exploratory because only four conditions generated an estimated 50% response within or near the tested concentration range.
RESULTS
The initial yield model showed R 2 = 0.85, Q 2 = 0.35, model validity = 0.70 and reproducibility = 0.85. Acetone produced the highest extraction yield under the central design conditions (0.309 g/g). Four water- or ethanol-derived extracts produced concentration-dependent reductions in SRB signal at high concentrations. The original study analysis estimated IC 50 values of approximately 5.4-9.2 mg/mL. The aqueous condition employing 8 hours, 35°C, 125 rpm and a 1:10 solid-to-solvent ratio produced a yield of 0.116 g/g and the lowest reported IC 50 estimate. However, concentration ranges were not uniform across all runs, and the biological-response model could not be adequately validated because of the limited number of quantifiable responses.
CONCLUSION
Extraction yield did not predict the observed MCF-7 response, indicating that yield alone is insufficient for selecting extraction conditions. The high estimated concentrations required to reduce SRB signal indicate weak preliminary activity and do not establish anticancer efficacy. These findings provide an exploratory basis for prospective confirmation using uniform concentration ranges, independent biological experiments, validated curve fitting, chemical standardization, orthogonal cytotoxicity assays and non-malignant-cell controls.