Efficacy testing for hair care products.
For the efficacy testing of hair care products, a number of methods are available. Scanning electron microscopy and atomic force microscopy are most suitable for surface evaluation; the swelling properties in the course of a treatment are determined using a fiber-swelling analyzer, and the luster may be reliably determined by means of a multiangle goniophotometer. Further, surface tension is a suitable method to evaluate the hydrophilic/hydrophobic properties of a hair section, and is sensitive enough to indicate the individual hormone cycle.
Deutsches Wollforschungsinstitut an der RWTH Aachen e.V., Aachen, Deutschland. hoecker@dwi.rwth-aachen.de
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D001696:Biomechanical Phenomena; D006203:Hair Preparations / Q000592:standards*; D006801:Humans; D008722:Methods; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D013055:Spectrophotometry, Infrared / Q000379:methods; D013500:Surface Tension
D006203:Hair Preparations