| 摘要 |
<p>The in vitro method comprises preparing a suspension of microbeads in a liquid suspension medium, loading the suspension of microbeads with beta 2GPI proteins in a buffer either by coupling in a passive manner in a suspension medium, or using a chemical bonding protocol, contacting the microbeads with the fluid medium in a container in a condition suitable for a fixation of bacteria on the proteins without the presence of oxidizing metal ions, separating the prepared microbeads from the suspension medium by centrifugation, and evacuating the suspension medium from the container. The in vitro method comprises preparing a suspension of microbeads in a liquid suspension medium, loading the suspension of microbeads with beta 2GPI proteins in a buffer either by coupling in a passive manner in a suspension medium, or using a chemical bonding protocol, contacting the microbeads with the fluid medium in a container in a condition suitable for a fixation of bacteria on the proteins without the presence of oxidizing metal ions, separating the prepared microbeads from the suspension medium by centrifugation, evacuating the suspension medium from the container to obtain a residue with a high concentration of bacteria, and detecting, quantifying and/or identifying the bacterial residue. The microbeads are bounded by an external surface constituted by a solid polymer material able to bind proteins. The microbeads constituting the residue are washed and then contacted with a culture medium for bacterial multiplication and incubation in culture medium for a duration and at a suitable temperature. The fluid medium is sheep blood culture medium. After obtaining high concentration bacterial residue, the microbead suspension is placed in a tripticase soja broth, and then the broth is placed on the sheep blood culture medium. The bacteria is identified by gram staining and/or subculturing on a selective medium. The bacteria is quantified by reading optical density, adenosine triphosphate (ATP) meter or by polymerase chain reaction (PCR) lysate. The solid material constituting the outer surface of microbeads is a plastic material, an elastomer, and a material optionally bearing reactive groups grafted on the outer surface of the microbeads to ensure a chemical bonding with the proteins. The microbeads have a spherical form and an average diameter of 1-100000 nm, and a core made of magnetic material particles to allow their separation with respect to the suspension medium by a magnetic field. The protein microbeads is loaded in the liquid suspension medium, which contains 10 -> 6>to 100 mg of proteins and a concentration of 10 -> 5>to 10 mu g/mu l by stirring the suspension for 15-60 minutes at a temperature of 30-45[deg] C.</p> |
