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This study identified optimal parameters for extracting oil from Urtica dioica roots to maximize phytosterol content, using corn oil and a 1:5 raw material-extract ratio over a 6-hour maceration period.

This study describes a capillary GC method for accurately measuring spermidine levels in hair lotions, confirming its precision and specificity for this application.

This study established a sensitive and reproducible method for determining the levels of four organic solvents in finasteride raw materials, meeting the requirements of the Chinese Pharmacopeia.

This study found that using headspace capillary gas chromatography effectively determined the levels of residual organic solvents, including chloroform and dichloromethane, in finasteride with good separation and detection limits.

This study established a reliable method for determining residual solvents in Finasteride using gas chromatography.