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Rapid calcification propensity testing in blood using a temperature controlled microfluidic polymer chip.
Bavendiek, Julia; Maurer, Philip; Gräber, Steffen; Pasch, Andreas; Schomburg, Werner Karl; Jahnen-Dechent, Willi.
Afiliación
  • Bavendiek J; KEmikro, RWTH Aachen University, Aachen, Germany.
  • Maurer P; KEmikro, RWTH Aachen University, Aachen, Germany.
  • Gräber S; Biointerface Laboratory, Helmholtz-Institute for Biomedical Engineering, RWTH Aachen University Clinics, Aachen, Germany.
  • Pasch A; Calciscon AG, Nidau; Lindenhofspital, Bern, Switzerland; Institute for Physiology and Pathopysiology, Johannes Kepler University, Linz, Austria.
  • Schomburg WK; KEmikro, RWTH Aachen University, Aachen, Germany.
  • Jahnen-Dechent W; Biointerface Laboratory, Helmholtz-Institute for Biomedical Engineering, RWTH Aachen University Clinics, Aachen, Germany.
PLoS One ; 15(4): e0230493, 2020.
Article en En | MEDLINE | ID: mdl-32255786
Phosphate toxicity is a major threat to cardiovascular health in chronic kidney disease. It is associated with oxidative stress, inflammation and the accumulation of calcium phosphate commonly known as calcification in soft tissues leading to functional disorders of blood vessels. An improved calcification propensity test for the assessment of phosphate toxicity was developed, which measures the velocity of calcium phosphate mineralization from colloidal precursors in vitro. This so called T50 test measures the transformation from a primary into a secondary form of nanosized colloidal plasma protein-calcium phosphate particles known as calciprotein particles. The T50 test in its previous form required a temperature controlled nephelometer and several hours of continuous measurement, which precluded rapid bed side testing. We miniaturized the test using microfluidic polymer chips produced by ultrasonic hot embossing. A cartridge holder contained a laser diode for illumination, light dependent resistor for detection and a Peltier element for thermo control. Increasing the assay temperature from 37°C to 75°C reduced the T50 test time 36-fold from 381 ± 10 min at 37°C to 10.5 ± 0.3 min at 75°C. Incorporating sputtered micro mirrors into the chip design increased the effective light path length, and improved signal-to-noise ratio 9-fold. The speed and reproducibility of the T50 chip-based assay run at 75°C suggest that it may be suitable for rapid measurements, preferably in-line in a dialyser or in a portable microfluidic analytic device with the chip inserted as a disposable cartridge.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Polímeros / Fosfatos de Calcio / Microfluídica Tipo de estudio: Diagnostic_studies Límite: Humans Idioma: En Revista: PLoS One Asunto de la revista: CIENCIA / MEDICINA Año: 2020 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Polímeros / Fosfatos de Calcio / Microfluídica Tipo de estudio: Diagnostic_studies Límite: Humans Idioma: En Revista: PLoS One Asunto de la revista: CIENCIA / MEDICINA Año: 2020 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Estados Unidos