Method of measurement in chromatography
View Patent ↗A substantial amount of a marker reagent associated with a measurement is measured in a marker reagent measurement area, and the substantial amount of the marker reagent is reflected by a result obtained in a reaction result measurement area where a reaction with a measurement target in an inspection target solution is measured. Thereby, an influence of external environmental factors, factors in a property of the inspection target solution, an erroneous operation in a measurement operation or the like is eliminated, whereby a chromatography measuring method employing a biosensor with higher accuracy and higher reliability can be provided.
1. A chromatography measuring method comprising:
providing a biosensor having
(i) a development portion,
(ii) a label reagent held in a first part of said development portion in a dry state, said label reagent being elutable by a test sample comprising an analyte, and
(iii) an immobilized reagent in a second part of said development portion,
wherein said label reagent in said first part binds to said analyte in said test sample, and said immobilized reagent in said second part is a reagent that specifically binds to a complex comprising said analyte and the labeled reagent;
developing said test sample on said development portion;
using an optical detector to measure in an area between said first and second parts of said development portion that does not include said second part of said development portion, an amount of said label reagent eluted from said first part of said development portion;
using an optical detector to measure, in said second part of said development portion, an amount of any label reagent bound to said immobilized reagent in said second part of said development portion;
correcting the measured amount of said label reagent bound to said immobilized reagent in said second part of said development portion, on the basis of a relationship between the measured amount of said label reagent eluted from the first part of said development portion and a total amount of said label reagent present in said first part of said development portion before application of said test sample; and
calculating a concentration of said analyte in said test sample on the basis of the corrected amount of said label reagent bound to said immobilized reagent in said second part of said development portion.
2. The chromatography measuring method according to claim 1 , wherein
using an optical detector to measure the amount of said label reagent eluted from said first part of said development portion is performed prior to using an optical detector to measure the amount of said label reagent bound to said immobilized reagent in said second part of said development portion.
3. The chromatography measuring method according to claim 1 , wherein
using an optical detector to measure the amount of said label reagent eluted from said first part of said development portion comprises measuring said amount of said label reagent, eluted from said first part of said development portion, before said test sample passes said second part of said development portion.
4. The chromatography measuring method according to claim 1 , wherein
using an optical detector to measure the amount of said label reagent eluted from said first part of said development portion comprises measuring said amount of said label reagent, eluted from said first part of said development portion, before said label reagent binds to any immobilized reagent.
5. A chromatography measuring method comprising:
providing a biosensor having
(i) a development portion,
(ii) a label reagent held in a first part of said development portion in a dry state, part of said label reagent being elutable by a test sample comprising an analyte, and
(iii) an immobilized reagent in a second part of said development portion,
wherein said label reagent in said first part binds to said analyte in said test sample, and said immobilized reagent is a reagent that specifically binds to a complex comprising said analyte and the labeled reagent;
developing said test sample on said development portion;
using an optical detector to measure, in said second part of said development portion, an amount of said label reagent so as to obtain an amount of said label reagent bound to said immobilized reagent in said second part of said development portion;
using an optical detector to measure, in a measurement area of said first part of said development portion, an amount of residual label reagent not eluted from said first part of said development portion by the developing of said test sample;
correcting the obtained amount of said label reagent bound to said immobilized reagent in said second part of said development portion, on the basis of a relationship between the measured amount of residual label reagent not eluted from said first part of said development portion and a total amount of said label reagent present in said first part of said development portion before application of said test sample; and
calculating a concentration of said analyte in said test sample on the basis of the corrected amount of said label reagent bound to said immobilized reagent in said second part of said development portion.
6. The chromatography measuring method according to claim 5 , wherein
using an optical detector to measure the amount of residual label reagent not eluted from said first part of said development portion is performed prior to using an optical detector to measure the amount of said label reagent so as to obtain the amount of said label reagent bound to said immobilized reagent in said second part of said development portion.
7. The chromatography measuring method according to claim 5 , wherein
using an optical detector to measure the amount of residual label reagent not eluted from said first part of said development portion comprises measuring said amount of said residual label reagent, not eluted from said first part of said development portion, before said label reagent, eluted from said first part, becomes bonded to any immobilized reagent.
8. A chromatography measuring method comprising:
providing a biosensor having
(i) a development portion,
(ii) a label reagent held in a first part of said development portion in a dry state, said label reagent being elutable by a test sample comprising an analyte, and
(iii) an immobilized reagent in a second part of said development portion,
wherein said label reagent in said first part binds to and reacts with said immobilized reagent while said label reagent is in said inspection target solution after having been eluted by said test sample, and said immobilized reagent in said second part is a reagent with which said label reagent and analyte competitively bind;
developing said test sample on said development portion;
using an optical detector to measure, in a measurement area between said first and second parts of said development portion that does not include said second part of said development portion, an amount of said label reagent eluted from said first part of said development portion;
using an optical detector to measure, in said second part of said development portion, an amount of said label reagent bound to said immobilized reagent in said second part of said development portion;
correcting the measured amount of said label reagent bound to said immobilized reagent in said second part of said development portion, on the basis of a relationship between the measured amount of said label reagent eluted from said first part of said development portion and a total amount of said label reagent present in said first part of said development portion before application of said test sample; and
calculating a concentration of said analyte in said test sample on the basis of the corrected amount of said label reagent bound to said immobilized reagent in said second part of said development portion.
9. The chromatography measuring method according to claim 8 , wherein
using an optical detector to measure the amount of said label reagent eluted from said first part of said development portion is performed prior to using an optical detector to measure the amount of said label reagent bound to said immobilized reagent in said second part of said development portion.
10. The chromatography measuring method according to claim 8 , wherein
using an optical detector to measure the amount of said label reagent eluted from said first part of said development portion comprises measuring said amount of said label reagent, eluted from said first part of said development portion, before said test sample passes said second part of said development portion.
11. The chromatography measuring method according to claim 8 , wherein
using an optical detector to measure the amount of said label reagent eluted from said first part of said development portion comprises measuring said amount of said label reagent, eluted from said first part of said development portion, before said label reagent binds to any immobilized reagent.
12. A chromatography measuring method comprising:
providing a biosensor having:
(i) a development portion,
(ii) a label reagent held in a first part of said development portion in a dry state, part of said label reagent being elutable by a test sample comprising an analyte, and
(iii) an immobilized reagent in a second part of said development portion,
wherein said label reagent in said first part binds to and reacts with said immobilized reagent while said label reagent is in said test sample after having been eluted by said test sample, and said immobilized reagent is a reagent with which said label reagent and analyte competitively bind;
developing said test sample said development portion;
using an optical detector to measure, in said second part of said development portion, an amount of said label reagent so as to obtain an amount of said label reagent bound to said immobilized reagent in said second part of said development portion;
using an optical detector to measure, in a measurement area of said first part of said development portion, an amount of residual label reagent not eluted from said first part of said development portion;
correcting the obtained amount of said label reagent bound to said immobilized reagent in said second part of said development portion, on the basis of a relationship between the measured amount of residual label reagent not eluted from said first part of said development portion and a total amount of said label reagent present in said first part of said development portion before application of said test sample; and
calculating a concentration of said analyte in said test sample on the basis of the corrected amount of said label reagent bound to said immobilized reagent in said second part of said development portion.
13. The chromatography measuring method according to claim 12 , wherein
using an optical detector to measure the amount of residual label reagent not eluted from said first part of said development portion is performed prior to using an optical detector to measure the amount of said label reagent so as to obtain the amount of said label reagent bound to said immobilized reagent in said second part of said development portion.
14. The chromatography measuring method according to claim 12 , wherein
using an optical detector to measure the amount of residual label reagent not eluted from said first part of said development portion comprises measuring said amount of said residual label reagent, not eluted from said first part of said development portion, before said label reagent, eluted from said first part becomes bonded to any immobilized reagent.