title: Contribution to interplay between a delamination test and a sensory analysis of mid-range lipsticks.
abstract: BACKGROUND
  Lipstick is currently one of the most sold products of cosmetics industry, and the competition between the various manufacturers is significant. Customers mainly seek products with high spreadability, especially long-lasting or long wear on the lips. Evaluation tests of cosmetics are usually performed by sensory analysis. This can then represent a considerable cost.
  
  
  OBJECTIVE
  The object of this study was to develop a fast and simple test of delamination (objective method with calibrated instruments) and to interplay the obtained results with those of a discriminative sensory analysis (subjective method) in order to show the relevance of the instrumental test.
  
  
  METHODS
  Three mid-range lipsticks were randomly chosen and were tested. They were made of compositions as described by the International Nomenclature of Cosmetic Ingredients (INCI). Instrumental characterization was performed by texture profile analysis and by a special delamination test. The sensory analysis was voluntarily conducted with an untrained panel as blind test to confirm or reverse the possible interplay.
  
  
  RESULTS
  The two approaches or methods gave the same type of classification. The high-fat lipstick had the worst behaviour with the delamination test and the worst notation of the intensity of descriptors with the sensory analysis.
  
  
  CONCLUSIONS
  There is a high correlation between the sensory analysis and the instrumental measurements in this study. The delamination test carried out should permit to quickly determine the lasting (screening test) and in consequence optimize the basic formula of lipsticks.
authors.affiliation: Laboratoire de Mécanique et Rhéologie (LMR) EA 2640, Université François Rabelais de Tours, 7 Avenue Marcel Dassault, 37200, Tours, France.
authors.forename: C
authors.initials: C
authors.lastname: Richard
authors.affiliation: Centre d'Etudes et de Recherches sur les TEchnologies du SENSoriel (CERTESENS), 56 Avenue Marcel Dassault, 37200, Tours, France.
authors.forename: B
authors.initials: B
authors.lastname: Tillé-Salmon
authors.affiliation: Unit Imaging and Brain- UMR Inserm 930, CHRU of Tours- Hospital Bretonneau, 2BoulevardTonnellé, Building B1A, 37044, Tours Cedex 9, France.
authors.forename: Y
authors.initials: Y
authors.lastname: Mofid
mesh_terms: D003358:Cosmetics; D006801:Humans; D008422:Materials Testing
chemical_list: D003358:Cosmetics
keywords: colour cosmetics; duo-trio method; lipsticks; sensory analysis; stability; statistics