Method and apparatus for rapid analysis of a biological sample
A method of analysing a sample comprising nucleic acid. The method includes introducing the sample into a discrete container that is prefilled with a lysis buffer. Agitating the container to assist with lysing to release nucleic acid. Extracting a lysed sample from the container and introducing the lysed sample into a sample chamber of a disposable cartridge. Mixing the lysed sample with a dilution buffer in the sample chamber to obtain a first mixture. Fluidly connecting the sample chamber to a mixing chamber. “Displacing the first mixture from the sample chamber to the mixing chamber. Fluidly connecting the mixing chamber to a mastermix chamber containing a mastermix. Displacing the first mixture to obtain a second mixture.” Displacing the second mixture from the mastermix chamber to an analysis unit. Operating the analysis unit to identify the nucleic acid or other nucleic acids derived from the nucleic acid.
1. A method of analysing a sample comprising nucleic acid, the method comprising:
introducing said sample into a discrete container that is prefilled with a lysis buffer;
agitating the container to assist with lysing to release nucleic acid;
extracting lysed sample from the container and introducing the lysed sample into a sample chamber of a disposable cartridge;
mixing the lysed sample with a dilution buffer in the sample chamber to obtain a first mixture of lysed sample and dilution buffer;
fluidly connecting the sample chamber to a mixing chamber of the disposable cartridge;
displacing the first mixture from the sample chamber to the mixing chamber;
fluidly connecting the mixing chamber to a mastermix chamber of the disposable cartridge containing a mastermix;
displacing the first mixture from the mixing chamber to the mastermix chamber to obtain a second mixture;
displacing the second mixture from the mastermix chamber to an analysis unit; and
operating the analysis unit to identify all, or parts of, the nucleic acid or other nucleic acid derived from the first mentioned nucleic acid.
2. A method according to claim 1 , where said sample contains biological cells containing said nucleic acid.
3. A method according to claim 1 , where said nucleic acid is DNA or RNA.
4. A method according to claim 1 , wherein the sample is lysed in lysis buffer with a pH between 12 and 14.
5. A method according to claim 1 , wherein the step of operating the analysis unit comprises operating the analysis unit to identify all, or parts of, the nucleic acid or other nucleic acid using PCR or LAMP.
6. A method according to claim 1 , wherein said step displacing the second mixture from the mastermix chamber to the analysis unit comprises:
displacing the second mixture from the mastermix chamber back into the mixing chamber;
fluidly connecting the mixing chamber to an analysis unit; and
displacing the second mixture from the mixing chamber to the analysis unit.
7. A method according to claim 6 , wherein displacement of mixtures between the various chambers is achieved by applying a positive or negative air pressure to the mixing chamber.
8. A method according to claim 1 , wherein said sample chamber and said mastermix chamber are provided within an outer housing of a disposable cartridge, and said mixing chamber is provided within an inner housing of the disposable cartridge, the inner and outer housings being rotatable relative to one another about a central axis in order to facilitate said steps of fluidly connecting.
9. A method according to claim 1 , the steps being performed in sequence and without any intervening elution and/or washing steps.
10. A method according to claim 1 , wherein said step of agitating the container comprises manually agitating the container.
11. A method according to claim 1 , wherein the analysis unit is installed in the disposable cartridge.