Method of assaying specimen substance by controlling dose of che

Details Method of assaying specimen substance by controlling dose of che Method of assaying specimen substance by controlling dose of che

1997-10-08

1999-09-14

Warden, Jill

Chemistry: analytical and immunological testing

Optical result

With fluorescence or luminescence

73 6148, 73 6456, 250361C, 250362, 250364, 422 52, 422 681, 422 8205, 436 27, 436 56, 436171, 435 6, 435 912, G01N 2176

Patent

active

059522380

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a method for assay of an analyte by use of a material labeled with a chemiluminescent substance. More specifically, the invention relates to a method for assay in a broader range by decreasing the quantity of chemiluminescence.


BACKGROUND ART

Among methods for assay of an analyte in a test solution is one using a probe labeled with a chemiluminescent substance. This method is widely used as being capable of determining the amount of the analyte highly sensitively by measuring the quantity of chemiluminescence. This method is useful for a suitable amount of the analyte. In the presence of a large amount of the analyte (e.g. when many copies are produced by gene amplification such as polymerase chain reaction), however, the quantity of chemiluminescence by the method exceeds the determination limit of a measuring device, making accurate assay impossible. Such samples with results in excess of the upper assay limit have been determined again after dilution of the test solution. This procedure is very laborious. Samples amplified by gene amplification, in particular, can cause contamination of the amplified product as a result of dilution. Utmost care has been taken to avoid the contamination, further increasing labor. To broaden the range of assay without diluting the sample, there has been no choice but to wait for an improvement in the measuring device.
We, the inventors, have found that the foregoing problems with the determination of a sample beyond the assay limits can be solved by decreasing the quantity of chemiluminescence, without requiring a laborious operation such as the dilution of the sample, or an improvement in the measuring device. This finding has led us to accomplish this invention.


DISCLOSURE OF THE INVENTION

The present invention is a method for assay of an analyte by use of a material labeled with a chemiluminescent substance, which comprises decreasing the quantity of chemiluminescence. The invention further provides a method for assay which comprises adding a quencher and/or decreasing the specific activity of a chemiluminescent substance labeled probe.
The assay of the analyte by use of a material labeled with a chemiluminescent substance, indicated above, refers, for example, to reacting a sample containing an analyte with a material labeled with a chemiluminescent substance, and measuring the quantity of chemiluminescence of the conjugate to detect or determine the analyte.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows the effect of Phenol Red addition on the quantitative amplification and detection of HBV template in the serum; and
FIG. 2 shows the effect of unlabeled probe addition on the quantitative amplification and detection of HBV template in the serum.


BEST MODE FOR CARRYING OUT THE INVENTION

The quencher used in the present invention may be any substance which can quench chemiluminescence. For example, it includes color matters and india ink (drops of india ink, supernatant of india ink). Examples of the color matters are Crystal Violet, Bromophenol Blue, carminic acid, Chlorophenol Red, hematoxylin, Bromophenol Purple, Bromophenol Red, rosolic acid, Phenol Red, Cresol Red, and Methacresol Red.
When the color matter is used as the quencher, the concentration of the color matter at measurement of chemiluminescence may be in the range of 0.01 to 10%, preferably 0.01 to 1%, although it differs depending on the color matter used. When india ink is used as the quencher, on the other hand, its amount at measurement of chemiluminescence may be in the range of 0.01 to 50%, preferably 1 to 20%, based on the amount of the test solution. The quencher may be added at any time before measurement of chemiluminescence. For example, it may be added either before or after the reaction between the analyte and the labeled probe. Activity of a Chemiluminescent Substance Labeled Probe
To decrease the specific activity of a labeled probe in the present invention, an unlabeled probe is added to the labeled probe. The unlabeled probe may be a

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