Carbohydrate-deficient transferrin assay

G - Physics – 01 – N

Patent

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Details

G01N 33/68 (2006.01) G01N 33/536 (2006.01) G01N 33/84 (2006.01) G01N 33/98 (2006.01)

Patent

CA 2213516

The invention provides a method of assessment of carbohydrate-deficient transferrin in a transferrin containing body fluid, said method comprising the steps of: i) obtaining a transferrin containing liquid sample of or derived from a said fluid; ii) contacting said sample with a source of iron ions; iii) subsequently contacting said sample with an anionic ion exchange resin at a pH such as to cause carbohydrate-deficient transferrin to be retained by said resin; iv) subsequently contacting said resin with an eluant serving to release carbohydrate-deficient transferrin into the eluate from said resin; v) collecting a volume of said eluate substantially free from tetra- and penta- sialo transferrin; and vi) assessing the transferrin variant content in said volume of eluate. By including at least a proportion of the trisialotransferrin in the eluate, it is possible to use relatively simple assessment techniques such as turbidimetry in the assay.

Cette invention concerne un procédé de dosage transferrine à teneur en glucides insuffisante dans un liquide biologique contenant de la transferrine, ledit procédé consistant à: i) obtenir un échantillon liquide contenant de la transferrine, prélevé dans ledit liquide ou dérivé de ce dernier, ii) mettre en contact ledit échantillon avec une source d'ions fer, iii) mettre ensuite ledit échantillon en contact avec une résine échangeuse d'ions anionique à un certain pH de sorte que ladite résine de la transferrine à teneur en glucides insuffisante soit retenue par ladite résine, iv) mettre ensuite ladite résine en contact avec un éluant servant à libérer la transferrine à teneur en glucides insuffisante dans l'éluat de ladite résine, v) recueillir un volume dudit éluat semsiblement exempt de tétra- et penta-sialo transferrine, vi) et à évaluer le contenu variable de transferrine dans ledit volume d'éluat. Le fait d'inclure au moins une proportion de trisialotransferrine dans l'éluat rend possible, au cours du dosage, l'utilisation de méthodes d'évaluation relativement simples telles que la turbidimétrie.

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