US 5,436,166 AGranted

Method of and apparatus for performing chromatography analysis of unknown sample

AssigneeHitachi, Ltd.

InventorsMasahito Ito, Junkichi Miura, Yoshio Fujii, Hiroshi Satake, Fuzio Yamada, Kouichi Tagami, Fuminori Umesato

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Abstract

The present invention relates to a chromatography analysis method and a system employing the same which are capable of automatically determining an constituents to be detected contained in the unknown sample based on results on measuring a standard sample. The standard sample is first separated to obtain its chromatogram. The system extracts the necessary information from the chromatogram to identify the peaks corresponding to the constituents to be detected to set widths of time windows for the peaks. Then, the time windows thus set are applied to the chromatograms obtained by the separation of the unknown sample to identify the constituents contained in the unknown sample. By employing the present invention, it is unnecessary for an operator to input the retention time of each constituent to the system.

Claims10

Dependent claims

A method of performing a chromatography analysis of an unknown sample, the method comprising the steps of:

(a) performing chromatography analysis of a standard sample to obtain a chromatogram of the standard sample, the standard sample including constituents to be measured in the unknown sample;
(b) defining first retention time windows within which peaks corresponding to the constituents to be measured are expected to appear in the chromatogram of the standard sample, the first retention time windows being defined by first retention times and first tolerances about the first retention times;
(c) detecting peaks in the chromatogram of the standard sample appearing within the first retention time windows;
(d) determining at least one of (1) whether or not areas of the detected peaks conform with predetermined areas indicative of the peaks corresponding to the constituents to be measured and (2) whether or not heights of the detected peaks conform with predetermined heights indicative of the peaks corresponding to the constituents to be measured;
(e) defining second retention time windows corresponding to the constituents to be measured only if it is determined that at least one of (1) the areas of the detected peaks conform with the predetermined areas indicative of the peaks corresponding to the constituents to be measured and (2) the heights of the detected peaks conform with the predetermined heights indicative of the peaks corresponding to the constituents to be measured, the second retention time windows being defined by second retention times and second tolerances about the second retention times, the second retention times being equal to retention times of the detected peaks, the second tolerances being smaller than the first tolerances;
(f) performing chromatography analysis of the unknown sample to obtain a chromatogram of the unknown sample;
and
(g) identifying in the unknown sample the constituents to be measured by analyzing the chromatogram of the unknown sample using the second retention time windows.

5 more elements

A method of performing a chromatography analysis of an unknown sample, the method comprising the steps of:

(a) performing chromatography analysis of a standard sample to obtain a chromatogram of the standard sample, the standard sample including constituents to be measured in the unknown sample;
(b) defining a first retention time window within which peaks corresponding to the constituents to be measured are expected to appear in the chromatogram of the standard sample, the first retention time window being defined by a first retention time and a first tolerance about the first retention time;
(c) detecting peaks in the chromatogram of the standard sample appearing within the first retention time window;
(d) determining (1) whether or not the detected peaks are equal in number to the constituents to be measured and (2) whether or not areas of the detected peaks are at least equal to a predetermined area, the predetermined area being greater than zero;
(e) determining at least one of (1) whether or not areas of the detected peaks conform with predetermined areas indicative of the peaks corresponding to the constituents to be measured and (2) whether or not heights of the detected peaks conform with predetermined heights indicative of the peaks corresponding to the constituents to be measured only if it is determined that (1) the detected peaks are equal in number to the constituents to be measured and (2) the areas of the detected peaks are at least equal to the predetermined area;
(f) defining second retention time windows corresponding to the constituents to be measured only if it is determined that at least one of (1) the areas of the detected peaks conform with the predetermined areas indicative of the peaks corresponding to the constituents to be measured and (2) the heights of the detected peaks conform with the predetermined heights indicative of the peaks corresponding to the constituents to be measured, the second retention time windows being defined by second retention times and second tolerances about the second retention times, the second retention times being equal to the retention times of the detected peaks, the second tolerances being smaller than the first tolerance;
(g) performing chromatography analysis of the unknown sample to obtain a chromatogram of the unknown sample;
and
(h) identifying in the unknown sample the constituents to be measured by analyzing the chromatogram of the unknown sample using the second retention time windows.

6 more elements

An apparatus for performing a chromatography analysis of an unknown sample, the apparatus comprising:

(a) means for performing chromatography analysis of a standard sample to obtain a chromatogram of the standard sample, the standard sample including constituents to be measured in the unknown sample;
(b) means for defining first retention time windows within which peaks corresponding to the constituents to be measured are expected to appear in the chromatogram of the standard sample, the first retention time windows being defined by first retention times and first tolerances about the first retention times;
(c) means for detecting peaks in the chromatogram of the standard sample appearing within the first retention time windows;
(d) means for determining at least one of (1) whether or not areas of the detected peaks conform with predetermined areas indicative of the peaks corresponding to the constituents to be measured and (2) whether or not heights of the detected peaks conform with predetermined heights indicative of the peaks corresponding to the constituents to be measured;
(e) means for defining second retention time windows corresponding to the constituents to be measured only if it is determined that at least one of (1) the areas of the detected peaks conform with the predetermined areas indicative of the peaks corresponding to the constituents to be measured and (2) the heights of the detected peaks conform with the predetermined heights indicative of the peaks corresponding to the constituents to be measured, the second retention time windows being defined by second retention times and second tolerances about the second retention times, the second retention times being equal to retention times of the detected peaks, the second tolerances being smaller than the first tolerances;
(f) means for performing chromatography analysis of the unknown sample to obtain a chromatogram of the unknown sample;
and
(g) means for identifying in the unknown sample the constituents to be measured by analyzing the chromatogram of the unknown sample using the second retention time windows.

5 more elements

An apparatus for performing a chromatography analysis of an unknown sample, the apparatus comprising:

(a) means for performing chromatography analysis of a standard sample to obtain a chromatogram of the standard sample, the standard sample including constituents to be measured in the unknown sample;
(b) means for defining a first retention time window within which peaks corresponding to the constituents to be measured are expected to appear in the chromatogram of the standard sample, the first retention time window being defined by a first retention time and a first tolerance about the first retention time;
(c) means for detecting peaks in the chromatogram of the standard sample appearing within the first retention time window;
(d) means for determining (1) whether or not the detected peaks are equal in number to the constituents to be measured and (2) whether or not areas of the detected peaks are at least equal to a predetermined area, the predetermined area being greater than zero;
(e) means for determining at least one of (1) whether or not areas of the detected peaks conform with predetermined areas indicative of the peaks corresponding to the constituents to be measured and (2) whether or not heights of the detected peaks conform with predetermined heights indicative of the peaks corresponding to the constituents to be measured only if it is determined that (1) the detected peaks are equal in number to the constituents to be measured and (2) the areas of the detected peaks are at least equal to the predetermined area;
(f) means for defining second retention time windows corresponding to the constituents to be measured only if it is determined that at least one of (1) the areas of the detected peaks conform with the predetermined areas indicative of the peaks corresponding to the constituents to be measured and (2) the heights of the detected peaks conform with the predetermined heights indicative of the peaks corresponding to the constituents to be measured, the second retention time windows being defined by second retention times and second tolerances about the second retention times, the second retention times being equal to the retention times of the detected peaks, the second tolerances being smaller than the first tolerance;
(g) means for performing chromatography analysis of the unknown sample to obtain a chromatogram of the unknown sample;
and
(h) means for identifying in the unknown sample the constituents to be measured by analyzing the chromatogram of the unknown sample using the second retention time windows.

6 more elements

Dependencies are inferred from the claim text.