Answers are grounded in this paper and cite their sources.
Quality control of pharmaceutical aspirin powder was studied using first order differential near-infrared diffuse reflectance spectra and four standard multivariate methods, hierarchical clustering analysis, stepwise clustering analysis, principal components analysis, and stepwise discrimination. The qualified, inferior, and fake pharmaceutical aspirin powders of independent samples can be distinguished by the multivariate analysis methods based on the reflectance spectra. The proposed methods are reliable, fast and nondestructive.
No takes yet. Share an insight, caveat, or question.
Ren et al. (1997) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: