CN1487278A - Method of utilizing quartz crystal microbalance in detecting virus in sample liquid - Google Patents

Abstract

The method of utilizing quartz crystal microbalance in detecting virus in sample solution includes the following steps: adhering the electrode probe of the quartz crystal microbalance with antibody corresponding to the virus to be detected, drying and measuring the frequency f0 of the quartz in vacuum or air as the reference; setting the processed probe iniside solution without virus, measuring the frequency f1 and calculating the difference f1-f0; setting the processed probe inside the sample solution, measuring the frequency fm and calculating the difference fm-f0; and comparing the two differences to judge whether there is some virus in the sample solution or not based on whether the absolute value of fm-f0 is greater than that of f1-f0 or fm-f0=f1-f0. The said method is sensitive, low in test cost and fast and may be used widely in testing various kinds of virus.

Description

In test solution, utilize QCM (Quartz Crystal Microbalance) to detect the method for virus

Technical field

The present invention relates to the method that a kind of QCM (Quartz Crystal Microbalance) detects virus, particularly about a kind of method of in test solution, utilizing QCM (Quartz Crystal Microbalance) to detect virus.

Technical background

In the prior art, have following several to the detection method of virus:

1, molecular testing (PCR) method: the viral nucleic acid genosome sequence of promptly directly examining and determine polymerase chain reaction, often reach several ten thousand because of the genosome sequence is long, therefore this method verification process is more time-consuming, and cost is very high, in addition because repeating of similar viral gene body sequence is more, thereby cause the check poor sensitivity.

2, immunofluorescence analytic approach (Immunofluorescence assay): the serum that promptly utilizes antibody in the serum contain antiviral antibody to be used as testing reagent and doubtful patient mixes, if patient's serum contains virus, will with the antibodies of testing reagent, and change the fluorescence spectra of testing reagent.Just can draw test result after adopting this method calibrating that obvious spectral effects will be arranged by the time, thereby will just can measure in many days after being ill the patient, and sensitivity and selectivity deficiency.

3, cell proliferation cultivation: be about to the isolated virus of patient's corpse or other object for laboratory examination and chemical testing, bred, this method only can provide the evidence of challenge virus, and verification process is comparatively time-consuming.

4, QCM (Quartz Crystal Microbalance) aging method: what use at present is to put antibody on the electrode catheter of AT cutting quartz wafer, and antibody combines with corresponding virus and the increase that produces micro-quality, uses Sauerbrey law (Shu Borui law) then,

$\mathrm{\Δf}=-\left[\frac{{2f}_o^2}{\sqrt{{\mathrm{\ρ}}_q{C}_q}}\right]\mathrm{\Δm}$

In the formula: Δ f: frequency change, Δ m: mass change, f _o: the original frequency of quartz crystal, ρ _q: quartzy density, C _q: quartzy deformation coefficient; Measure frequency change, released the quality trace increases by the frequency change of measuring easily.

But the Sauerbrey law only is applicable in the vacuum or adds the situation of solid gravity die quality on the airborne quartz crystal; Hardware film thickness or quality as the metal on thickness monitor (Thickness Monitor) the monitoring evaporation used when the vacuum evaporation, organic substance etc., so can not be applicable to the detection of test solution, but the virus detection nearly all is the detection to test solution such as blood, saliva etc., and it is not enough therefore to detect viral confidence level with the method.How using QCM (Quartz Crystal Microbalance) that viral test solution is detected, is the problem that the present invention will study.

Summary of the invention

At the problems referred to above, the purpose of this invention is to provide a kind of method that can in test solution, utilize QCM (Quartz Crystal Microbalance) to detect virus.

For achieving the above object, the present invention is by the following technical solutions: a kind of QCM (Quartz Crystal Microbalance) of utilizing in test solution detects viral method, and its step is as follows:

(1) on the probe of QCM (Quartz Crystal Microbalance), adheres to and the corresponding antibody of pre-detection virus, after the drying, measure quartz crystal at vacuum or airborne frequency values f _o, and with it as reference value;

(2) will put into through the probe that step (1) is handled and not have virus, but with liquid phase to be tested with solution in, measure in the solution frequency values f of quartz crystal under the virus-free situation _l, calculate frequency values f ₁With reference value f _oBetween changing value Δ f _l=f _l-f _o

(3) will put into test solution to be measured through the probe that step (1) is handled, measure the frequency values f of quartz crystal in test solution _m, calculate frequency values f _mWith reference value f _oBetween changing value Δ f _m=f _m-f _o

(4) the frequency change value of comparison step (2) and step (3) is if the two numerical value equates Δ f _m=Δ f _l, illustrating does not have virus in the test solution; If Δ f _mWith Δ f _lThe numerical value difference, | Δ f _m|＞| Δ f _l| then proving has virus to exist in the test solution.

The frequency change value Δ f that calculates of step (2) wherein _lShould meet Kanazawa law (the mutual law of Ka Nagan):

${\mathrm{\Δf}}_l=[-\frac{{2f}_o^2}{\sqrt{{\mathrm{\ρ}}_q{C}_q}}\sqrt{\frac{{\mathrm{\ρ}}_l{\mathrm{\η}}_l}{4\mathrm{\π}{f}_o}}]$

In the formula: Δ f _l: quartz crystal is put into solution and is produced frequency variation, f _o: the original frequency of quartz crystal, ρ _q: quartz crystal density, C _q: quartzy deformation coefficient, ρ _l: fluid density, η _l: the liquid viscosity.

The frequency change value Δ f that calculates of step (3) wherein _mShould meet Martin law (Martin's law):

${\mathrm{\Δf}}_m=-\frac{{2f}_o^2}{\sqrt{{\mathrm{\ρ}}_q{C}_q}}[{\mathrm{\ρ}}_s+\sqrt{\frac{{\mathrm{\ρ}}_l{\mathrm{\η}}_l}{4\mathrm{\π}{f}_o}}]$

In the formula: Δ f _mBe the frequency variation that the thickness quality changes in the solution, f _oBe the original frequency of quartz crystal, ρ _qBe quartz crystal density, C _qBe quartzy deformation coefficient, ρ _sBe the unit area density that increases the surface thickness quality layers, ρ _lBe fluid density, η _lIt is the liquid viscosity;

When the frequency change value of comparison step (2) and step (3), if the frequency change of quartz crystal in test solution meets the Kanazawa law, i.e. Δ f _m=Δ f _l, proving does not have virus in the test solution; If the frequency change of quartz crystal in test solution meets the Martin law, promptly | Δ f _m|＞| Δ f _l|, proving has virus to exist in the test solution, and can calculate the antigen of virus on the QCM (Quartz Crystal Microbalance) probe and the micro-quality that antibodies increases by the Martin law.

A plurality of quartz crystal arrays can be set on described QCM (Quartz Crystal Microbalance), on each described array, an electrode catheter be set, on each described probe, adhere to the corresponding antibodies of different virus, to detect the multiple virus in the test solution to be measured simultaneously.

The present invention is owing to take above technical scheme, it has the following advantages: 1, the inventive method utilization adheres to antiviral antibody on the QCM (Quartz Crystal Microbalance) probe, with the viral antigen principle of combining in the test solution to be measured, by measuring the frequency of quartz crystal in air or vacuum, measure the frequency change of quartz crystal in virus-free solution, and the frequency change of measurement quartz crystal in test solution to be measured, and frequency change compared, realized that QCM (Quartz Crystal Microbalance) detects the purpose of virus in liquid.2, the present invention introduces Kanazawa law and Martin law, not only can obtain virus-free conclusion, and can accurately measure virus quantity, and its sensitivity can reach＜and 10 ^-8Gram.3, the present invention has not only proposed to use in liquid QCM (Quartz Crystal Microbalance) to measure the method for virus, and this method is compared with existing measuring method, easy to detect, it is fast to go out the result, the detection cost is low, and a plurality of quartz crystal arrays particularly are set on QCM (Quartz Crystal Microbalance), adheres to and the corresponding monoclonal antibody of different virus on different quartz crystal probes, can once detect the multiple trace virus in the test solution to be measured simultaneously, also can detect repeated overlapping and infect.This is in the most responsive in the world present detection test solution virus-free method to be arranged.The inventive method can be widely used in the virus detection of various liquor samples.

Embodiment

Embodiment one detects herpes virus (human herpes viruses)

QCM (Quartz Crystal Microbalance) is used AT incising circular quartz crystal chip, diameter 8.0mm, circular metal electrode diameter 4.0mm, thickness 200nm, plane basic wave, 10MHz quartz crystal probe, be soaked into earlier in the CMV65-kDe antibody-solutions, individual layer CMV65-kDe antibody is sticked on the quartz crystal detecting probe surface, to be dried after, measure the original frequency f of quartz crystal _o, probe is put into does not have virus again, but with liquid phase to be tested with solution in, measure in the solution frequency values f of quartz crystal under the virus-free situation _l, according to the Kanazawa law, frequency values f as can be known _lReduce frequency values f ₁With reference value f _oBetween changing value Δ f _l=f _l-f _o

This is stained with the quartz crystal probe of CMV65-kDe antibody, immersion may contain in the test solution of herpes virus, exist if any herpes virus this moment, then antibody will combine with the antigen of herpes virus, the surface thickness (quality) of quartz crystal probe is increased, it meets the Martin law, and the frequency of quartz crystal further reduces, promptly | and Δ f _m|＞| Δ f _l|, then can detect has herpes virus to exist in the test solution, finish check.

As the quartz crystal frequency changing value Δ f that measures _m=Δ f _l, meet the Kanazawa law, show that then no herpes virus exists in the test solution to be measured, finish check.

Embodiment two detection Immunodeficiency virus (antihuman immuodefficiency viruses, HIV)

QCM (Quartz Crystal Microbalance) is used AT incising circular quartz crystal chip, diameter 8.0mm, circular metal electrode diameter 4.0mm, thickness 200nm (nanometer), plane basic wave, 10MHz quartz crystal probe, be soaked into earlier in the anti-HIV manoclonel antibody-solutions, individual layer anti-HIV manoclonel antibody is sticked on the quartz crystal detecting probe surface, to be dried after, measure the original frequency f of quartz crystal _o, probe is put into does not have virus again, but with liquid phase to be tested with solution in, measure the frequency values f of quartz crystal this moment _l, according to the Kanazawa law, frequency values f as can be known _lReduce frequency values f _lWith reference value f _oBetween changing value Δ f _l=f _l-f _o

This is stained with the quartz crystal probe of anti-HIV manoclonel antibody, immersion may contain in the test solution of immunity virus, exist if any immunity virus this moment, then antibody will combine with the antigen of immunity virus, quartz crystal detecting probe surface thickness quality is increased, meet the Martin law, frequency further reduces, promptly | and Δ f _m|＞| Δ f _l|, then can detect Immunodeficiency virus and exist, finish check.

As the quartz crystal frequency changing value Δ f that measures _m=Δ f _l, meet the Kanazawa law, show that then no Immunodeficiency virus exists in the test solution to be measured, finish check.

Embodiment three detects different virus simultaneously

A QCM (Quartz Crystal Microbalance) appliance computer can the while array use a plurality of quartz crystal probes, on different quartz crystal probes, adhere to the corresponding monoclonal antibody of different virus, can read the frequency of each quartz crystal probe simultaneously, promptly once detect the multiple corresponding trace virus in the test solution to be measured simultaneously, also can detect repeated overlapping and infect.

In the various embodiments described above, the employed quartz crystal wafer of QCM (Quartz Crystal Microbalance) comprises various cutting modes, as cutting modes such as AT, BT, CT, DT, FC, GT, SC.

Claims (5)

1, a kind of method of in test solution, utilizing QCM (Quartz Crystal Microbalance) to detect virus, its step is as follows:

(1) on the electrode catheter of QCM (Quartz Crystal Microbalance), adheres to and the corresponding antibody of pre-detection virus, after the drying, measure quartz crystal at vacuum or airborne frequency values f _o, and with it as reference value;

(2) will put into through the probe that step (1) is handled and not have virus, but with liquid phase to be tested with solution in, measure in the solution frequency values f of quartz crystal under the virus-free situation _l, calculate frequency values f _lWith reference value f _oBetween changing value Δ f _l=f _l-f _o

(3) will put into test solution to be measured through the probe that step (1) is handled, measure the frequency values f of quartz crystal in test solution _m, calculate frequency values f _mWith reference value f _oBetween changing value Δ f _m=f _m-f _o

(4) the frequency change value of comparison step (2) and step (3) is if the two numerical value equates Δ f _m=Δ f _l, illustrating does not have virus in the test solution; If Δ f _mWith Δ f _lThe numerical value difference, | Δ f _m|＞| Δ f _l| then proving has virus to exist in the test solution.

2, the method for utilizing QCM (Quartz Crystal Microbalance) to detect virus in test solution as claimed in claim 1 is characterized in that: the frequency change value Δ f that step (2) calculates _lShould meet the Kanazawa law:

${\mathrm{\Δf}}_l=[-\frac{{2f}_o^2}{\sqrt{{\mathrm{\ρ}}_q{C}_q}}\sqrt{\frac{{\mathrm{\ρ}}_l{\mathrm{\η}}_l}{4\mathrm{\π}{f}_o}}]$

In the formula: Δ f _l: quartz crystal is put into solution and is produced frequency variation, f _o: the original frequency of quartz crystal, ρ _q: quartz crystal density, C _q: quartzy deformation coefficient, ρ _l: fluid density, η _l: the liquid viscosity.

3, the method for utilizing QCM (Quartz Crystal Microbalance) to detect virus in test solution as claimed in claim 1 is characterized in that: the frequency change value Δ f that step (3) calculates _mShould meet the Martin law:

${\mathrm{\Δf}}_m=-\frac{{2f}_o^2}{\sqrt{{\mathrm{\ρ}}_q{C}_q}}[{\mathrm{\ρ}}_s+\sqrt{\frac{{\mathrm{\ρ}}_l{\mathrm{\η}}_l}{4\mathrm{\π}{f}_o}}]$

In the formula: Δ f _mBe the frequency variation that the thickness quality changes in the test solution, f _oBe the original frequency of quartz crystal, ρ _qBe quartz crystal density, C _qBe quartzy deformation coefficient, ρ _sBe the unit area density that increases the surface thickness quality layers, ρ _lBe fluid density, η _lIt is the liquid viscosity;

4, the method for in test solution, utilizing QCM (Quartz Crystal Microbalance) to detect virus as claimed in claim 1, it is characterized in that: when the frequency change value of comparison step (2) and step (3), if the frequency change of quartz crystal in test solution meets the Kanazawa law, Δ f _m=Δ f _l, proving does not have virus in the test solution; If the frequency change of quartz crystal in test solution meets the Martin law, | Δ f _m|＞| Δ f _l|, proving has virus to exist in the test solution, and can calculate the antigen of virus on the QCM (Quartz Crystal Microbalance) probe and the micro-quality that antibodies increases by the Martin law.

5, as claim 1 or 2 or the 3 or 4 described methods of in test solution, utilizing QCM (Quartz Crystal Microbalance) to detect virus, it is characterized in that: described QCM (Quartz Crystal Microbalance) is provided with a plurality of quartz crystal arrays, on each described quartz crystal, an electrode catheter is set, on each described probe, adhere to the corresponding antibodies of different virus, to detect the multiple virus in the test solution to be measured simultaneously.