Method for identifying cholesterol in the skin tissue

C - Chemistry – Metallurgy – 12 – Q

Patent

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Details

C12Q 1/60 (2006.01) C12Q 1/26 (2006.01) C12Q 1/44 (2006.01) G01N 33/92 (2006.01)

Patent

CA 2281769

Disclosed is a method for identifying cholesterol in the skin tissue, consisting in the preparation of a segment of skin surface, the application of the measured quantity of a mixture containing enzymes to the skin. its exposure, the evaluation of the concentration of cholesterol in a reaction solution, and the calculation of the concentration of cholesterol in the skin. A contact area of skin with the mixture is defined using a bottomless airthight container, the base of which is attached to the skin. The mixture, which is used in a buffer solution with a pH of 6.8, contains (in molecular weight) 2.0 to 2.5 % cholesteroloxydase iodine, 0.04 to 0.06% sodium deoxycholic acid, and 0.1 to 0.2 % 3-propane sulphonate-(dodecyldimethylammonium). The concentration of cholesterol in the reaction solution is then evaluated by measuring the level of hydrogen peroxide; said measurement may be performed by immersing an electrochemical monitor or colorimetric indicator into the reaction solution.

La présente invention concerne une méthode de mise en évidence de la cholestérine dans les tissus cutanés, consistant à préparer un segment de peau, à appliquer sur celui-ci une quantité dosée d'un mélange contenant des enzymes, à l'exposer, à évaluer la concentration de cholestérine dans la solution de réaction et à quantifier la concentration de cholestérine cutanée, en délimitant sur le segment d'épiderme, à l'aide d'un réservoir étanchéifié sans fond dont la base est fixée sur la peau, la zone de contact de la peau avec le mélange. Ce mélange, que l'on utilise dans une solution tampon d'un pH de 6,8, contient (en poids moléculaire) 2 à 2,5 % d'iode de cholestérinoxydase, 0,04 à 0,06 % de sodium désoxycholevoacide, 0,04 à 0,2 % de propanesulfonate-(dodéthyldiméthylammonium). On évalue ensuite la concentration de cholestérine dans la solution de réaction en mesurant le niveau de péroxyde d'hydrogène, par exemple en immergeant dans la solution de réaction un capteur électrochimique ou un indicateur colorimétrique.

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