CN104987393A - Cadmium-very low density lipoprotein chelate as well as preparation method and application thereof - Google Patents

Cadmium-very low density lipoprotein chelate as well as preparation method and application thereof Download PDF

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CN104987393A
CN104987393A CN201510411288.6A CN201510411288A CN104987393A CN 104987393 A CN104987393 A CN 104987393A CN 201510411288 A CN201510411288 A CN 201510411288A CN 104987393 A CN104987393 A CN 104987393A
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cadmium
vldl
inner complex
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chromatography column
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张积仁
阳帆
董欣敏
吴婧
蔡睿
孙遥
赵乙木
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Shanghai Baihao Biotechnology Co Ltd
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    • G01—MEASURING; TESTING
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Abstract

The invention discloses a cadmium-very low density lipoprotein chelate as well as a preparation method and an application thereof. The cadmium-very low density lipoprotein chelate is formed by chelating cadmium ions and very low density lipoprotein by virtue of sulfydryl or/and cysteine residues, and can be used for preparing a reagent for detecting the cadmium-very low density lipoprotein chelate of a human body. The invention verifies that the cadmium ions can directly act on the very low density lipoprotein for the first time. The invention establishes a quantitative and qualitative detection method of the cadmium-very low density lipoprotein chelate, so as to detect the content of the very low density lipoprotein in the bodies of people in an area, thereby indirectly reflecting the cadmium pollution level of the area and the influence on the health of people. The cadmium-very low density lipoprotein chelate quantitative detection method established by the invention has the advantages that the accuracy is high, and the repeatability is good.

Description

A kind of cadmium-vldl inner complex and its preparation method and application
Technical field
The present invention relates to the immunology detection of heavy metal ion, be specifically related to a kind of cadmium-vldl inner complex and its preparation method and application.
Background technology
Lipoprotein (lipoproteins) is a kind of lipid-protein complex that protein and lipid binding are formed, high-density lipoprotein (HDL) (high density lipoprotein is divided into by density, HDL), intermediated-density lipoprotein (intermediate densitylipoprotein, IDL), low-density lipoprotein (low density lipoprotein, LDL), vldl (very lowdensity lipoprotein, VLDL), chylomicrons (chylomiCdon, CM).In blood, the cholesterol of about 70% is entrained by LDL and VLDL, and the endogenous triglyceride level (triglyceride, TG) produced in liver also mainly relies on VLDL to be transported to outside liver.Increasing with hyperlipidaemia, disorders of lipid metabolism of VLDL is closely bound up, and hyperlipemia is the important risk factor that various diseases occurs, thus stable stable the playing an important role for human body each side function function of VLDL contents level.
VLDL contents level and structure function stable significant to body.Its too high levels and fatty liver, disorders of lipid metabolism, cardiovascular disorder, renal function damage etc. are closely bound up.Detection by quantitative VLDL may be used for the early diagnosis of these diseases and result for the treatment of monitoring, even as one of the evaluation index of prognosis quality.And for patients such as malnutrition, chronic anaemia, liver function damage persons, serum VLDL content also can decline, detection by quantitative VLDL also can be used for the early diagnosis of these diseases, result for the treatment of monitoring and one of the index as prognostic evaluation.
Cadmium is that one common are noxious metals and environmental pollutant, is widely used in industrial production environment, comprises plating, process industry pigment, stabilizer for plastics, Ni-Cr battery etc., lives closely bound up with people.For general population, mainly by sucking the air of cadmium pollution, and the edible modes such as the farm crop (as containing cadmium rice) of cadmium rural sewage disposal farm production that contain take in cadmium.Research shows, cadmium is a kind of Systematic toxin, can cause the multiple organ such as the lung of humans and animals, liver, kidney and the multisystem function damage such as cardiovascular, immune, neural, also have stronger carcinogenesis.1993 IARC (IARC) cadmium and compound thereof are classified as the 1st class people carcinogens.Visible cadmium is on the impact of body and important, very important.
Documents existing a large amount of at present confirms that cadmium can act on the albumen in each system of whole body, thus affects the function of Body organs.As everyone knows, vldl is a kind of protein of Special Significance, and whether cadmium can act on vldl, and makes vldl structural modification, content change, activity change, changing function, and these still lack correlative study.
Summary of the invention
For the problem that cadmium pollution is serious, the object of the present invention is to provide a kind of cadmium-vldl inner complex and preparation method thereof, and set up the qualitative and quantitative analysis method of cadmium-vldl inner complex, so that detection by quantitative cadmium-vldl inner complex is in the application of the regional cadmium pollution degree of evaluation one.By cadmium-vldl inner complex in the regional crowd's serum of detection by quantitative one, indirectly can reflect the situation of this regional crowd by cadmium pollution, thus indirectly reflect this regional cadmium pollution degree.
The technical solution adopted for the present invention to solve the technical problems is: provide a kind of cadmium-vldl inner complex, this cadmium-vldl inner complex be cadmium ion and vldl by sulfydryl or/and cysteine residues chelating forms.
The present invention also provides a kind of preparation method of above-mentioned cadmium-vldl inner complex, i.e. external synthesis method, comprises the following steps:
The synthesis of A) cadmium-vldl inner complex: add cadmium ion and carry out chelatropic reaction purifying in the vldl that comes from human body or the vldl according to biological method restructuring, obtain reaction soln;
B) cadmium-vldl inner complex purifying: adopt immune-affinity chromatography, removal step A) unreacted vldl, specific antibody and cadmium ion in reaction soln, obtain cadmium-vldl inner complex.
As preferably, described step B) in specifically comprise the following steps:
(1) sample dissolution: by above-mentioned steps A) the cadmium-vldl inner complex of extraction be dissolved in physiological saline, obtain the solution of cadmium-vldl inner complex;
(2) balance chromatography column: use dilution buffer to rinse the pipeline of chromatography column, load in chromatography column can with the filler of vldl specific binding, after dress post, continue to use dilution buffer balance chromatography column;
Described can with the filler of vldl specific binding be adsorbed with can with the silica gel of vldl specific binding material or resin;
(3) loading: after chromatography column balance, with the solution of dilution buffer dilution step (1), then upper prop, make vldl and filler specific binding;
(4) wash-out: use dilution buffer to rinse chromatography column and balance to baseline, then use the Na of 0.05-0.10mol/L 2hPO 4solution carries out wash-out;
(5) collect: the elutriant collecting step (4), makes albumen restore immediately after collection;
(6) dialyse: by the elutriant of the collection in step (5), dress dialysis tubing, uses ddH 2o dialyses desalination, and after changing water three times, 4 DEG C of dialysed overnight, collect sample;
(7) balance chromatography column: adopt new chromatography column, use dilution buffer flushing pipeline, in this chromatography column load can with the filler of cadmium specific binding, dress post after balance chromatography column by dilution buffer again;
Described can with the filler of cadmium specific binding be adsorbed with can with the silica gel of cadmium specific binding material or resin;
(8) loading: after chromatography column balance, with sample, then upper prop in dilution buffer dilution step (6);
(9) wash-out: use dilution buffer to rinse chromatography column and balance to baseline, then use the Na of 0.5-1.0mol/L 2hPO 4solution carries out wash-out;
(10) collect: the elutriant collecting step (9), makes albumen restore immediately after collection;
(11) dialyse: by the elutriant of step (10), dress dialysis tubing, uses ddH 2o dialyses desalination, and after changing water three times, 4 DEG C of dialysed overnight, collect sample, obtain cadmium-vldl inner complex.
As preferably, the preparation method of above-mentioned cadmium-vldl inner complex, also comprises the following authentication step to cadmium-vldl inner complex, specifically comprises the following steps:
(1) glue bed is prepared: prepare glue bed using the one in sepharose, polyacrylamide gel as medium;
(2) application of sample: get step B) in cadmium-vldl inner complex of obtaining of extraction purification, add sample-loading buffer, and mix, then application of sample is in sample cell;
(3) electrophoresis: connect electrophoresis plate, carry out electrophoresis;
(4) detect: on glue bed, find out the protein band containing cadmium, this protein band is taken out, protein band is dissolved, and then adopt ICP-MS or AAS whether to detect in this liquid containing cadmium and the content detecting cadmium.
The present invention also provides the application of a kind of cadmium described above-vldl inner complex in preparation human body in the reagent of cadmium-vldl inner complex or test kit.
The present invention also provides a kind of and at least comprises the test kit of cadmium described above-vldl inner complex as standard substance.
Preferably, also comprise coating buffer in this test kit, this coating buffer contains the material of catching vldl or the material of catching cadmium metal.
The present invention also provides the method for a kind of detection by quantitative cadmium-vldl inner complex, using the above-mentioned cadmium-vldl inner complex of known content as standard substance, a pair sample of following methods is adopted to detect: euzymelinked immunosorbent assay (ELISA), enzyme linked immunological and atomic absorption spectrum combined techniques, enzyme linked immunological and inductivity coupled plasma mass spectrometry combined techniques, purification cadmium-vldl inner complex and enzyme linked immunological combined techniques, purification cadmium-vldl inner complex and atomic absorption spectrum combined techniques, purification cadmium-vldl inner complex and inductivity coupled plasma mass spectrometry combined techniques, electrophoresis and enzyme linked immunological or atomic absorption spectrum or inductivity coupled plasma mass spectrometry combined techniques.
Compared to existing technology, beneficial effect of the present invention is:
1. the present invention has synthesized cadmium-vldl inner complex first;
2. the present invention proposes cadmium-vldl inner complex first and can be used for preparing application in the reagent or test kit detecting cadmium-vldl inner complex in blood sample;
3. present invention achieves-specific recognition of vldl inner complex and detection by quantitative, so that the content of cadmium-vldl inner complex in detection by quantitative crowd serum, to evaluate the application of a regional cadmium pollution degree, for the cadmium pollution level of industrial area provides indirect indexes.The accuracy of cadmium-vldl inner complex quantitative detecting method that the present invention sets up is high, reproducible.
Accompanying drawing explanation
Fig. 1 is the non denatured electrophoretic band figure of cadmium of the present invention-vldl inner complex;
Fig. 2 is the fluorometric analysis figure of the synchrotron radiation X line electrophoresis strip of cadmium of the present invention-vldl inner complex.
Embodiment
Below in conjunction with embodiment, the present invention is described further:
Unless otherwise indicated, the laboratory operating procedures related to is the step of this area routine in the present invention; Agents useful for same, material, as non-specified otherwise, are all considered as to buy from commercial mode:
Extracting reagent is PEG solution, borate buffer solution etc. (adopting PEG method);
The material of catching vldl is anti-vldl antibody, by commercially available acquisition, as the anti-HDL antibody of " Genetex gtx16419 " that Ai Bokang (Shanghai) trade Co., Ltd sells, in following embodiment, be describedly the material of catching vldl with the material of vldl specific binding, anti-vldl antibody, anti-VLDL antibody;
Enzyme labelled antibody is the one in the antibody containing the enzyme labelling such as horseradish peroxidase, alkaline phosphatase;
Dilution buffer is the 0.05M carbonate buffer solution of pH 9.6, compound method example: the Na getting 1.5g 2cO 3with the NaHCO of 2.93g 3dissolving adds ddH 2o is settled to 1000mL;
Lavation buffer solution is the 0.15M PBS solution of pH7.4, compound method example: the KH getting 0.2g 2pO 4, 2.90g Na 2hPO 412H 2kCl, 0.5mLTween-20 of NaCl, 0.2g of O, 8.0g, dissolve and add ddH 2o is settled to 1000mL;
Confining liquid is bovine serum albumin solution, compound method example: get 0.1g bovine serum albumin, adds lavation buffer solution dilution and is settled to 100mL;
Stop buffer is 2M H 2sO 4, compound method example: the ddH getting 178.3mL 2o, enriching H 2sO 4be settled to 200mL;
Substrate is methyl diphenyl amine (TMB) solution, compound method example: get the methyl diphenyl amine ethanolic soln that 0.5mL concentration is 2g/L, add substrate dilution and be diluted to 10mL;
Substrate buffer solution pH is 5.0, wherein Na 2hPO 4volumetric molar concentration be 0.2M, the volumetric molar concentration of citric acid is 0.1M, compound method example: get 1.42gNa 2hPO 4, 0.96g citric acid, then add ddH 2o to 50mL, to obtain final product;
The compound method example of elutriant: papoid pH 8.0,0.1mol/L Tris-HCI buffer is become 1-2mg/mL, then add 1mmol/L dithiothreitol (DTT) (DTT) 37 DEG C and hatch 30min, obtain elutriant;
Sample-loading buffer can be formulated by the component of following ratio: Tris-HCl:1% tetrabromophenol sulfonphthalein: ddH 2o: glycine=15.5:2.5:7:25, wherein the pH of Tris-HCl is 6.8, volumetric molar concentration is 1M;
The compound method of electrophoretic buffer is as follows: get 3.0g Tris, 14.4g glycine, be dissolved in 800mLddH 2in O, after adjusting pH to 8.3, be settled to 1L;
The mouse-anti Cd mAb that to be article No. be the material of catching cadmium " cling to proud AP7015 "; Wherein, of the present invention with the material of cadmium specific binding, anti-Cd antibody, two anti-, Cadmium resistance antibody is the material of catching cadmium;
The invention provides a kind of cadmium-vldl inner complex, cadmium ion and vldl by sulfydryl or/and cysteine residues chelating forms.
Particularly, cadmium-vldl inner complex is by the inner complex of cadmium by combining in conjunction with at least one structure in zinc fingers, sulfydryl, cysteine residues and the apolipoprotein B in vldl or cholesterol, triglyceride level etc. and formed.
The present invention also provides the preparation method of cadmium-vldl inner complex, comprises the following steps:
A) synthesis of cadmium-vldl: add cadmium ion and carry out chelatropic reaction purifying in the vldl that comes from human body or the vldl according to biological method restructuring, obtain reaction soln;
B) cadmium-vldl inner complex purifying: adopt immune-affinity chromatography, removal step A) unreacted vldl, specific antibody and cadmium ion in reaction soln, obtain cadmium-vldl inner complex, specifically comprise the following steps:
Described step B) in specifically comprise the following steps:
(1) sample dissolution: by above-mentioned steps A) the cadmium-vldl inner complex of extraction be dissolved in physiological saline, obtain the solution of cadmium-vldl inner complex;
(2) balance chromatography column: use dilution buffer to rinse the pipeline of chromatography column, load in chromatography column can with the filler of vldl specific binding, after dress post, continue to use dilution buffer balance chromatography column;
Described can with the filler of vldl specific binding be adsorbed with can with the silica gel of vldl specific binding material or resin;
(3) loading: after chromatography column balance, with the solution of dilution buffer dilution step (1), then upper prop, make vldl and filler specific binding;
(4) wash-out: use dilution buffer to rinse chromatography column and balance to baseline, then use the Na of 0.05-0.10mol/L 2hPO 4solution carries out wash-out;
(5) collect: the elutriant collecting step (4), makes albumen restore immediately after collection;
(6) dialyse: by the elutriant of the collection in step (5), dress dialysis tubing, uses ddH 2o dialyses desalination, and after changing water three times, 4 DEG C of dialysed overnight, collect sample;
(7) balance chromatography column: adopt new chromatography column, use dilution buffer flushing pipeline, in this chromatography column load can with the filler of cadmium specific binding, dress post after balance chromatography column by dilution buffer again;
Described can with the filler of cadmium specific binding be adsorbed with can with the silica gel of cadmium specific binding material or resin;
(8) loading: after chromatography column balance, with sample, then upper prop in dilution buffer dilution step (6);
(9) wash-out: use dilution buffer to rinse chromatography column and balance to baseline, then use the Na of 0.5-1.0mol/L 2hPO 4solution carries out wash-out;
(10) collect: the elutriant collecting step (9), makes albumen restore immediately after collection;
(11) dialyse: by the elutriant of step (10), dress dialysis tubing, uses ddH 2o dialyses desalination, and after changing water three times, 4 DEG C of dialysed overnight, collect sample, obtain cadmium-vldl inner complex.
C): to the qualification of cadmium-vldl inner complex, specifically comprise the following steps:
(1) glue bed is prepared: prepare glue bed using the one in sepharose, polyacrylamide gel as medium;
(2) application of sample: get step B) in cadmium-vldl inner complex of obtaining of extraction purification, add sample-loading buffer, and mix, then application of sample is in sample cell;
(3) electrophoresis: connect electrophoresis plate, carry out electrophoresis;
(4) detect: on glue bed, find out the protein band containing cadmium, this protein band is taken out, protein band is dissolved, and then adopt ICP-MS or AAS whether to detect in this liquid containing cadmium and the content detecting cadmium.
The present invention also provides a kind of and at least comprises the test kit of cadmium described above-vldl inner complex as standard substance.
In the present invention, the test kit that can realize the object of the invention can be listed following several, but is not limited to this.
A kind of test kit detecting cadmium in blood sample-vldl inner complex, comprise: containing the coating buffer that can be used for catching vldl, also comprise confining liquid, lavation buffer solution, the material of cadmium can be caught as two anti-, enzyme labelled antibody, substrate, stop buffer, dilution buffer, positive control, negative controls etc.
Detect a test kit for cadmium in blood sample-vldl inner complex, comprising: containing the coating buffer that can be used for catching vldl, also comprise confining liquid, lavation buffer solution, elutriant, positive control, negative control etc.
A kind of test kit detecting cadmium in blood sample-vldl inner complex, comprise: containing the coating buffer that can be used for catching vldl, also comprise confining liquid, lavation buffer solution, elutriant, souring agent, hydrogen peroxide, standard substance, negative control etc.
Detect a test kit for cadmium in blood sample-vldl inner complex, comprise extract vldl required extract reagent, redissolve liquid, containing the coating buffer, confining liquid, lavation buffer solution, enzyme labelled antibody, substrate, stop buffer, dilution buffer, standard substance, negative control etc. of material that can be used for catching cadmium.
Detect a test kit for cadmium in blood sample-vldl inner complex, comprise and extract vldl required extraction reagent, redissolution liquid, positive control, negative control etc.
Detect a test kit for cadmium in blood sample-vldl inner complex, comprise and extract vldl required extraction reagent, redissolution liquid, souring agent, hydrogen peroxide, positive control, negative control etc.
Detect a test kit for cadmium in blood sample-vldl inner complex, comprise and extract vldl and required extract reagent, glue bed medium, to redissolve on liquid, sample loading buffer, dissolving glue bed containing liquid needed for the protein band of cadmium, containing the coating buffer, confining liquid, lavation buffer solution, enzyme labelled antibody, substrate, stop buffer, positive control, negative control etc. of material that can be used for catching cadmium.
Detect a test kit for cadmium in blood sample-vldl inner complex, comprise and extract vldl and required extract reagent, glue bed medium, redissolve on liquid, sample loading buffer, dissolving glue bed containing liquid, positive control, negative control etc. needed for the protein band of cadmium.
Detect a test kit for cadmium in blood sample-vldl inner complex, comprise and extract vldl and required extract reagent, glue bed medium, redissolve on liquid, sample loading buffer, dissolving glue bed containing liquid, nitric acid, hydrogen peroxide, positive control, negative control etc. needed for the protein band of cadmium.
In above-mentioned several test kit, described positive control is standard substance, is namely chelated with the vldl inner complex of heavy metal cadmium or is chelated with the BSA inner complex of heavy metal cadmium; Described negative control is the dilution elutriant not containing standard substance.
Mentioned reagent box, for detecting cadmium-vldl inner complex, to improve accuracy and the repeatability of detection, and makes it to be promoted in clinical.
The present invention also provides the method for a kind of detection by quantitative cadmium-vldl inner complex, using the above-mentioned cadmium-vldl inner complex of known content as standard substance, a pair sample of following methods is adopted to detect: euzymelinked immunosorbent assay (ELISA), enzyme linked immunological and atomic absorption spectrum combined techniques, enzyme linked immunological and inductivity coupled plasma mass spectrometry combined techniques, purification cadmium-vldl inner complex and enzyme linked immunological combined techniques, purification cadmium-vldl inner complex and atomic absorption spectrum combined techniques, purification cadmium-vldl inner complex and inductivity coupled plasma mass spectrometry combined techniques, electrophoresis and enzyme linked immunological or atomic absorption spectrum or inductivity coupled plasma mass spectrometry combined techniques.In the present invention, following several with having of detecting that the method for cadmium-vldl inner complex can list, but be not limited to following several.
method one:euzymelinked immunosorbent assay (ELISA) (ELISA method) detects cadmium-vldl inner complex, detects in accordance with the following steps:
1) bag quilt: can catch the material of vldl to 500-4000 times with dilution buffer dilution, add in elisa plate micropore, 4 DEG C of 16-18 hour that spend the night, or 37 DEG C of water-bath 1-3 hour, store refrigerator;
2) close: remove dilution buffer, and wash with lavation buffer solution, after washing completes, add confining liquid, place 1 hour, remove confining liquid, and wash with lavation buffer solution for 37 DEG C, after having washed, elisa plate is placed 1 hour in 37 DEG C;
3) sample to be tested is added, and incubation: from recycle system sampling, make sample to be tested; Standard substance are made with the cadmium of known content-vldl inner complex; All be diluted to 10-40 doubly with dilution buffer dilution sample to be tested and standard substance, add in micropore, 37 DEG C of effect 1-2 hour;
4) material can catching cadmium is added, and incubation: remove sample to be tested, and wash with lavation buffer solution, after washing completes, add with dilution buffer dilution 12500-100000 Cadmium resistance antibody doubly, 37 DEG C of effect 1-2 hour, make the cadmium metal in Cadmium resistance antibody and vldl react;
5) enzyme conjugates incubation: remove Cadmium resistance antibody, washing, adds the HRP enzyme labelled antibody with dilution buffer dilution, and 37 DEG C of effect 1-2 hour, make itself and HRP enzyme labelled antibody react;
6) substrate incubation: remove enzyme labelled antibody, and wash with lavation buffer solution, after washing completes, adds substrate, 37 DEG C of lucifuge effects 30 minutes;
7) termination reaction: drip stop buffer to each micropore;
8) get wavelength 450nm, after adding stop buffer, elisa plate being placed in OD value microplate reader reading respectively sample to be tested group and standard substance, drawing standard curve, by comparing with standard substance group, trying to achieve the content of sample to be tested.
In present method, step 8) also can not use microplate reader, directly carry out qualitative detection by staining conditions.
The method utilizes ELISA principle, specificity vldl in whole blood can be extracted, the vldl upper part extracted is chelated with heavy metal cadmium, and cadmium in this part vldl can catch by the specific antibody of Cadmium resistance, afterwards can again by horseradish peroxidase, the antibody of the enzyme labellings such as alkaline phosphatase is caught (this antibody nonrecognition coating protein), the antibody of catching is under the effect of developer and stop buffer, OD value can be read under instrument, and the vldl not containing chelated mineral cadmium, then can not catch by the specific antibody of Cadmium resistance, also can not with horseradish peroxidase, the antibody of the enzyme labellings such as alkaline phosphatase caught, and also not containing cadmium metal (negative control group result is negative) in agents useful for same, thus when read OD value result is shown as the positive, the i.e. provable cadmium metal detecting chelating in vldl.
method two:enzyme linked immunological and atomic absorption spectrum combined techniques (ELISA method+AAS method) detect cadmium-vldl inner complex and detect in accordance with the following steps:
1) bag quilt: the material that vldl can be caught, as anti-vldl antibody (anti-vldl antibody) is coated on solid phase carrier: dilute anti-vldl antibody to 500-4000 times by dilution buffer, add in elisa plate micropore, 4 DEG C of 16-18 hour that spend the night, or 37 DEG C of water-bath 1-3 hour, store refrigerator;
2) close: remove dilution buffer, and wash with lavation buffer solution, after washing completes, add confining liquid, place 1 hour, remove confining liquid for 37 DEG C, and wash with corresponding lavation buffer solution, after having washed, elisa plate is placed 1 hour in 37 DEG C;
3) sample to be tested is added, and incubation: sample from the recycle system, make sample to be tested; Standard substance are made with the cadmium of known content-vldl inner complex; Be diluted to 10-40 doubly by dilution buffer, add in micropore, 37 DEG C of effect 1-2 hour;
4) wash-out: remove sample to be tested, washing, adds the elutriant that extension rate is 5-80, wash-out 1-3 hour at 37 DEG C;
5) detect: sample from ELISA micropore, detect the cadmium of chelating in vldl in Atomic Absorption Spectroscopy AAS, read respective value;
This embodiment utilizes ELISA principle to catch the vldl in serum, and detects the cadmium of chelating in vldl in conjunction with atomic absorption spectrum (AAS) instrument; Owing to only containing vldl in solution, and not containing any heavy metal (negative control group result is negative) in agents useful for same, interference can not be caused to result, thus when read result is shown as the positive, i.e. the provable cadmium metal detecting chelating in vldl.
method three:enzyme linked immunological and inductivity coupled plasma mass spectrometry combined techniques (ELISA method+ICP-MS method) detect cadmium-vldl inner complex and detect in accordance with the following steps:
1) bag quilt: the material that vldl can be caught, as anti-vldl antibody is coated on solid phase carrier, anti-vldl antibody is diluted to 500-4000 times by dilution buffer, add in elisa plate micropore, 4 DEG C of 16-18 hour that spend the night, or 37 DEG C of water-bath 1-3 hour, store refrigerator;
2) close: remove dilution buffer, and wash with lavation buffer solution, after washing completes, add confining liquid, place 1 hour, remove confining liquid for 37 DEG C, and wash with corresponding lavation buffer solution, after having washed, elisa plate is placed 1 hour in 37 DEG C;
3) sample to be tested is added, and incubation: get whole blood from the recycle system, make sample to be tested; Standard substance are made with the cadmium of known content-vldl inner complex; Be diluted to 10-40 doubly by dilution buffer, add in micropore, 37 DEG C of effect 1-2 hour;
4) wash-out: remove sample to be tested, and wash with corresponding lavation buffer solution, after washing completes, add dilution 5-80 elutriant doubly, wash-out 1-3 hour at 37-57 DEG C;
5) acidifying: in step 4) in solution in add souring agent acidifying carried out to solution, sealing is spent the night, thorough acidifying;
6) detect: add hydrogen peroxide, and heating catch up with acid, and from ELISA agent plate wash-out solution in get 0.5mL liquid, under icp ms, detect chelating in the cadmium of vldl, read respective value.
The method, on the basis utilizing ELISA principle, in conjunction with sense coupled plasma mass spectrometry (ICP-MS) principle, detects the cadmium of chelating in vldl with icp ms; Namely first adopt ELISA principle to be extracted by the cadmium in serum-vldl inner complex, then adopt sense couple plasma mass spectrometer to carry out detection by quantitative to the cadmium of chelating in vldl; Owing to only containing vldl in solution, and not containing any heavy metal (negative control group result is negative) in agents useful for same, interference can not be caused to result, thus when read result is shown as the positive, i.e. the provable cadmium metal detecting chelating in vldl.
method four:purification cadmium-vldl inner complex and enzyme linked immunological combined techniques (method of purification+ELISA method) detect cadmium-vldl inner complex, detect in accordance with the following steps:
1) from whole blood, non-specific vldl is extracted: adopt the methods such as ultracentrifugation, HPLC, gel-filtration chromatography, gel electrophoresis, vldl is extracted from whole blood, and the vldl extracted is redissolved, obtain the solution of vldl;
2) bag quilt: be coated on solid phase carrier by Cadmium resistance antibody, with dilution buffer dilution Cadmium resistance antibody to 12500-100000 times, adds in elisa plate micropore, 4 DEG C of 16-18 hour that spend the night, or 37 DEG C of water-bath 1-3 hour, stores refrigerator;
3) close: remove dilution buffer, and wash with lavation buffer solution, after washing completes, add confining liquid, place 1 hour, remove confining liquid for 37 DEG C, and wash with corresponding lavation buffer solution, after having washed, elisa plate is placed 1 hour in 37 DEG C;
4) sample to be tested is added, and incubation: sample from the redissolution liquid of the non-specific vldl extracted, make sample to be tested; Standard substance are made with the cadmium of known content-vldl inner complex; Be diluted to 10-40 doubly by dilution buffer, add in micropore, 37 DEG C of effect 1-2 hour;
5) enzyme conjugates incubation: remove sample to be tested, and wash with lavation buffer solution, after washing completes, adds the enzyme labelled antibody with dilution buffer dilution, and 37 DEG C of effect 1-2 hour, make itself and enzyme labelled antibody react;
6) substrate incubation: remove enzyme labelled antibody, and washing with corresponding lavation buffer solution, after washing completes, adds substrate, 37 DEG C of lucifuge effects 30 minutes;
7) termination reaction: drip stop buffer to each micropore;
8) get wavelength 450nm, after adding stop buffer, microplate reader reading the OD value of sample to be tested group and standard substance respectively, drawing standard curve, by comparing with standard substance group, trying to achieve the content of sample to be tested.
In present method, also can not use microplate reader, directly carry out qualitative detection by staining conditions.
method five:purification cadmium-vldl inner complex and atomic absorption spectrum combined techniques (method of purification+AAS method) detect cadmium in blood sample-vldl inner complex, detect in accordance with the following steps:
1) from whole blood, non-specific vldl is extracted: adopt the methods such as ultracentrifugation, HPLC, gel-filtration chromatography, gel electrophoresis, vldl is extracted from whole blood, and the vldl extracted is redissolved, obtain the solution of vldl;
2) detect: from step 1) solution in sample, detect the cadmium of chelating in vldl in Atomic Absorption Spectroscopy AAS, read respective value.
method six:purification cadmium-vldl inner complex and inductivity coupled plasma mass spectrometry combined techniques (method of purification+ICP-MS method) detect cadmium-vldl inner complex, detect in accordance with the following steps:
1) from whole blood, non-specific vldl is extracted: adopt the methods such as ultracentrifugation, HPLC, gel-filtration chromatography, gel electrophoresis, vldl is extracted from whole blood, and the vldl extracted is redissolved, obtain the solution of vldl;
2) acidifying: from step 1) solution in sample, add nitric acid in the solution and carry out acidifying to solution, sealing is spent the night, thorough acidifying;
3) detect: add hydrogen peroxide, and heating gets 0.5mL solution after catching up with acid, detects the cadmium of chelating in vldl under icp ms, read respective value.
Method four, method five and method six are all isolate vldl by whole blood extraction method, then adopt method for detecting specificity, measure the content of cadmium on cadmium-vldl inner complex in vldl; Namely first physical sepn means are adopted, as ultracentrifugation, HPLC, gel-filtration chromatography etc., vldl separated from test plasma sample and redissolve in physiological saline, recycling ELISA principle, atomic absorption spectrum detect or carry out detecting the cadmium content on inductively coupled plasma mass spectrometry detection cadmium-vldl inner complex.
Method seven: electrophoretic method+ELISA/AAS/ICP-MS method detects cadmium-vldl inner complex, specific as follows:
1) from whole blood, non-specific vldl is extracted: adopt the methods such as ultracentrifugation, HPLC, gel-filtration chromatography, gel electrophoresis, vldl is extracted from whole blood, the vldl extracted is redissolved in physiological saline, obtains the solution of vldl;
2) glue bed is prepared: select suitable medium (as sepharose, polyacrylamide gel etc.) as required, prepare corresponding glue bed according to corresponding requirements;
3) application of sample: from step 1) solution get 8 μ L solution, make standard substance with the cadmium of known content-vldl inner complex, add 2 μ L sample-loading buffers, and mix, then application of sample is in sample cell;
4) electrophoresis: connect electrophoresis plate, with electrophoretic buffer, carry out electrophoresis, and according to demand albumen is separated according to molecular weight, the isoparametric difference of iso-electric point;
5) detect: on glue bed, find out the protein band containing cadmium, this band is taken out, this protein band is dissolved, and then utilize the principles such as ELISA, ICP-MS or AAS to detect the cadmium content dissolved respectively.
In addition, the iso-electric point of this method detection cadmium-vldl inner complex, molecular weight and content etc. can also be utilized.
In method seven, vldl is extracted from whole blood, then adopt gel electrophoresis to be separated extracted vldl, then find out the respective strap being rich in cadmium, then detect the content of relevant pole low-density lipoprotein, namely after vldl discharges from red corpuscle, can by multiple Methods For Purification out (such as ultracentrifugation, HPLC, gel-filtration chromatography, gel electrophoresis, ELISA method etc.), the vldl of purifying out is redissolved, get a certain amount of vldl, utilize electric charge shifting principle, carry out electrophoresis (electrophoresis, EP), can according to molecular weight on gel slab (different media can be adopted as required), the difference such as iso-electric point runs out of different bands, find out the respective strap being rich in cadmium, protein in gel is redissolved, namely the content of relevant pole low-density lipoprotein can be detected at a particular wavelength, also ELISA can be utilized, AAS, the principles such as ICP-MS detect the cadmium content of chelating in vldl, owing to only containing vldl in solution, and not containing any heavy metal (negative control group result is negative) in agents useful for same, interference can not be caused to result, thus when read result is shown as the positive, the i.e. provable cadmium metal detecting chelating in vldl.
embodiment 1:synthesis method synthesis cadmium-vldl huge legendary turtle compound, namely comprises the following steps:
Cadmium prepared by the present embodiment-vldl huge legendary turtle compound, is separated further by gel electrophoresis, and carries out detection Qualitative Identification by inductivity coupled plasma mass spectrometry or atomic absorption spectrum.
Prepare the method for cadmium-vldl inner complex, comprise the following steps:
The reagent that the present embodiment uses is as follows:
1) borate buffer solution, its volumetric molar concentration is 0.01M, and its preparation method example is as follows: take 0.31g boric acid and be dissolved in 400mLddH 2in O, regulate pH to 9.0 with the NaOH of 0.1mol/L, be settled to 500mL.
2) EDTA-NaHCO 3mixed solution, its preparation method is as follows: get 1.86g EDTA2H 2o and 16.8g NaHCO 3, be dissolved in 900mLddH 2in O, adjust pH to 8.0 with 1.0M NaOH and be settled to 1000mL, autoclaving, room temperature preservation;
3) ITCBE buys from Japanese colleague's chemistry institute, article No. M030;
4) vldl solution: take 4.0mg vldl and be dissolved in 4.0mL0.01M pH9.0 borate buffer solution, dissolving of fully vibrating, be mixed with the vldl solution of 1.0mg/mL;
5) molecular weight cut-off 14000 of dialysis tubing, buys from Bioshop Inc;
The pre-treatment of dialysis tubing: EDTA-NaHCO dialysis tubing being put into 500mL 3in mixed solution, boil 10min; Tipping EDTA-NaHCO 3liquid, uses ddH 2o is rinsing gently, then boils 10min with 500mL5mmol/L EDTA; Discard boiling liquid, thoroughly use ddH 2o cleans, and adds a large amount of ddH 2o soaks dialysis tubing 4 DEG C and spends the night.During use, put on one's gloves, take out dialysis tubing, with a large amount of ddH 2its surfaces externally and internally of O cleaning down;
The synthesis of A) cadmium-vldl huge legendary turtle compound: add cadmium ion and carry out chelatropic reaction purifying in the vldl that comes from human body or the vldl according to biological method restructuring, obtain reaction soln, concrete operation step is as follows;
1) getting 2.0mg ITCBE is dissolved in 2mLDMSO;
2) liquid slowly step 1 prepared adds in vldl solution, and dropping limit, limit is shaken, and in 25 DEG C, acts on 24h in the shaking table of 100r/min, then to dialyse 24h with dialysis tubing, removes the ITCBE be not combined with vldl;
3) by the liquid 1mol/L HCl adjust ph to 7.0 of dialysis gained, then slowly drip 80 μ l 1mmol/L cadmium-ion solution gradually, dropping limit, limit vibrates, in order to avoid cadmium ion makes protein denaturation precipitate;
4) by the solution that added at 25 DEG C, react 2h in the shaking table of 100r/min, carry out dialysis 24h with the dialysis tubing handled well;
5) liquid of having dialysed is preserved in-20 DEG C of packing, obtain the reaction soln of cadmium-vldl inner complex.
B) cadmium-vldl inner complex purifying: adopt immune-affinity chromatography, removal step A) unreacted vldl, specific antibody and cadmium ion in reaction soln, obtain cadmium-vldl inner complex, specifically comprise the following steps:
(1) sample dissolution: by above-mentioned steps A) the cadmium-vldl inner complex of extraction be dissolved in physiological saline, obtain the solution of cadmium-vldl inner complex;
(2) balance chromatography column: use dilution buffer to rinse the pipeline of chromatography column, load in chromatography column can with the filler of vldl specific binding, after dress post, continue to use dilution buffer balance chromatography column;
(3) loading: after chromatography column balance, with the solution of dilution buffer dilution step (1), then upper prop, make vldl and filler specific binding;
(4) wash-out: use dilution buffer to rinse chromatography column and balance to baseline, then use the Na of 0.05-0.10mol/L 2hPO 4solution carries out wash-out;
(5) collect: the elutriant collecting step (4), makes albumen restore immediately after collection;
(6) dialyse: by the elutriant of the collection in step (5), dress dialysis tubing, uses ddH 2o dialyses desalination, and after changing water three times, 4 DEG C of dialysed overnight, collect sample;
(7) balance chromatography column: adopt new chromatography column, use dilution buffer flushing pipeline, in this chromatography column load can with the filler of cadmium specific binding, dress post after balance chromatography column by dilution buffer again;
(8) loading: after chromatography column balance, with sample, then upper prop in dilution buffer dilution step (6);
(9) wash-out: use dilution buffer to rinse chromatography column and balance to baseline, then use the Na of 0.5-1.0mol/L 2hPO 4solution carries out wash-out;
(10) collect: the elutriant collecting step (9), makes albumen restore immediately after collection;
(11) dialyse: by the elutriant of step (10), dress dialysis tubing, uses ddH 2o dialyses desalination, and after changing water three times, 4 DEG C of dialysed overnight, collect sample, obtain cadmium-vldl inner complex.
C) to the qualification of cadmium-vldl huge legendary turtle compound, concrete steps are as follows:
(1) glue bed is prepared: prepare glue bed using sepharose as medium;
(2) application of sample: get step B) in cadmium-vldl inner complex of obtaining of extraction purification, redissolve in physiological saline, obtain the solution of cadmium-vldl inner complex, get the above-mentioned solution of 8 μ L, add 2 μ L sample-loading buffers, and mix, then application of sample is in sample cell;
(3) electrophoresis: connect electrophoresis plate, carry out electrophoresis with electrophoretic buffer; In electrophoresis process, electric current is 22mA constant current, and envrionment temperature is 4 degree; Stop electrophoresis when moving to bottom glue to tetrabromophenol sulfonphthalein, Fig. 1 is the non denatured electrophoretic band figure of cadmium of the present invention-vldl huge legendary turtle compound;
(4) detect: on glue bed, find out the protein band containing cadmium, this protein band is taken out, protein band is dissolved, and then adopt ICP-MS or AAS whether to detect in this liquid containing cadmium and the content detecting cadmium.
D) qualification result
1) AAS detected result
Get step C) isolated protein band solution, with the content of heavy metal cadmium in graphite furnace atomic absorption spectrometry (AAS) rough determination vldl, as shown in the table, with NaCl solution, KBr solution, KCl solution for blank;
The content of cadmium in table 1 vldl
Sample name Cd(μg/L)
Sample to be tested 0.152
NaCl 0.023
KBr 0.000
KCl 0.000
2) Synchrotron Radiation X-Ray Fluorescence Anal ysis
In protein band, the SRXRF of micronutrient levels analyzes and " synchrotron radiation bunch completes at the 4W1 of Beijing electron positron collider (BEPC).In storage ring, beam current energy is 2.2GeV, beam intensity 100mA.Sample transfer table (TSA200 type, Beijing stand upright Han Guang company) can move up to change launching spot position along X, Y two-dimensional square under computer-controlled step motor drives, and moving step length is 0.0025mm.The X-ray gone out from electromagnetic radiation is detected by Si (Li) detector (PGT Inc.LS30143-DS), probe is mutually vertical with incident SR line copline, apart from sample irradiation point 20mm, signal obtains with PGT MCA (MCA4000) and exports.By the monochromatic synchrotron radiation light excited sample of 11.5keV, launching spot (1mmx 3mm) position is regulated to make it to be in band one end, in the minute of 300s, hot spot is always along band evenly slowly movement, and at the end of counting, hot spot moves on to this band the other end.A spectrum is got along the every 1mm in electrophoresis direction.Adopt AX IL software data processing, and with deriving from air and the Ar fignal center of content constant carries out normalization to other element peak, to offset the impact that beam intensity change produces signal power.Measure the fluorescence Spectra of the dry glued membrane of quantitative criterion at identical conditions in the same way.
Fig. 2 is the fluorometric analysis figure of the synchrotron radiation X line electrophoresis strip of cadmium of the present invention-vldl inner complex, and in figure, X-coordinate is protein band position, and ordinate zou is each metal energy of this band (content) value.
the determination of testing conditions
1. the determination of the optimum diluting multiple of anti-vldl antibody, anti-Cd antibody best effort concentration and blood plasma.
Euzymelinked immunosorbent assay (ELISA) detects the method for cadmium-vldl inner complex, specifically comprises the following steps:
1) bag quilt: anti-vldl antibody protein is coated on solid phase carrier, respectively by dilution buffer by coating protein with the doubling dilution of 1:500,1:1000,1:2000 and 1:4000, add in elisa plate micropore, each concentration bag, by three rows, is preserved 18 hours for 4 DEG C;
2) close: remove dilution buffer, washing, adds confining liquid, places 1 hour, removes confining liquid for 37 DEG C, washing;
3) sample to be tested is added: by dilution buffer by the doubling dilution of test plasma sample by 1:10,1:20,1:40, add in micropore, standard substance are made with the cadmium of known content-vldl inner complex, negative control and blank are set, add in micropore, 37 DEG C act on 1 hour;
4) add two to resist: remove test plasma sample, washing, add with the anti-Cd antibody of dilution buffer by the doubling dilution of 1:12500,1:25000,1:50000,1:100000,37 DEG C act on 1 hour, the cadmium metal in itself and vldl are reacted;
5) enzyme-added mark: remove anti-Cd antibody, washing, adds and is diluted to by dilution buffer the HRP enzyme labelled antibody that antibody concentration is 2ng/mL, and 37 DEG C act on 1 hour, make itself and anti-Cd antibody response;
6) substrate incubation: remove enzyme labelled antibody, washing, add substrate, 37 DEG C of lucifuge effect 30min, add stop buffer;
7) detect: the OD value reading standard substance, test plasma, positive control, negative control and blank sample under 450nm wavelength in microplate reader respectively, drawing standard curve, tries to achieve the content of sample to be tested.
In the present embodiment, adopt cadmium provided by the invention-vldl inner complex standard substance as positive control, respectively not add test plasma as negative control 1, namely add anti-vldl antibody, confining liquid, anti-Cd antibody, enzyme mark and substrate successively;
Not add the controlled trial group of anti-Cd antibody as negative control 2, namely add anti-vldl antibody, confining liquid, test plasma, enzyme mark and substrate successively;
Anti-vldl antibody, confining liquid, test plasma, anti-Cd antibody and substrate is added successively using not enzyme-added target controlled trial group as negative control 3, namely;
Not add the controlled trial group of sample to be tested and anti-Cd antibody as negative control 4 simultaneously, namely add anti-vldl antibody, confining liquid, enzyme mark and substrate successively;
Not add the controlled trial group of anti-vldl antibody work for blank 1, namely add confining liquid, test plasma, anti-Cd antibody, enzyme mark and substrate;
And with the controlled trial group only adding substrate for blank 2, only to add the controlled trial group of PBS for blank 3.
Table 2 is the sample OD Value Data of different anti-vldl antibody dilution multiple proportions, diluted plasma multiple proportions, anti-Cd antibody dilution multiple proportions,
Detected result under the different anti-vldl antibody of table 2, anti-Cd antibody and diluted plasma multiple proportions
As known from Table 2, when the dilution multiple proportions of anti-vldl antibody is 1:1000, sample OD value is greater than the dilution multiple proportions of other the anti-vldl antibody under parallel condition; In this group sample, when diluted plasma multiple proportions is 1:10, when anti-Cd antibody dilution multiple proportions is 1:12500, OD value is maximum, is 0.498.
The OD detected value of positive control, negative control and blank when the dilution multiple proportions that table 3 is anti-vldl antibody is 1:1000, diluted plasma multiple proportions is 1:10, anti-Cd antibody dilution multiple proportions is 1:12500,
The detected result of table 3 positive control, negative control and blank
As known from Table 3, test under the determined condition of table 2, negative control group OD detected value is less than 0.1, and under this optimal conditions is described, the systematic error of present method is little, meets analytical procedure requirement, so select concentration corresponding to this value as best effort concentration.
2.ELISA elutriant best effort concentration and time are determined
For seeking optimum elution requirement, by euzymelinked immunosorbent assay (ELISA) after anti-Cd antibody and enzyme labelled antibody incubation, carry out wash-out with the elutriant of different concns, then detect OD value by microplate reader, concrete steps are as follows:
(1) bag quilt: be coated on solid phase carrier by anti-Cd antibody protein, press the doubling dilution of 1:12500 by dilution buffer, adds in elisa plate micropore, preserves 16 hours for 4 DEG C;
(2) close: remove dilution buffer, after washing, add confining liquid, place 1 hour, remove confining liquid, and wash for 37 DEG C;
(3) add enzyme labelled antibody: remove confining liquid, after washing, add and be diluted to by dilution buffer the HRP enzyme labelled antibody that antibody concentration is 2 μ g/mL, 37 DEG C act on 2 hours, make itself and anti-Cd antibody response;
(4) wash-out: remove enzyme labelled antibody, elutriant is diluted by dilution buffer, make the concentration of papoid in elutriant: the concentration=1:5,1:10,1:20,1:40,1:80 of antibody in enzyme labelled antibody, elutriant is added in micropore, each concentration does 3 multiple holes, acts on 1h, 2h, 3h at being positioned over 37 DEG C respectively; Remove elutriant, washing, after washing completes, adds substrate, and 37 DEG C of lucifuge effects 30 minutes, add stop buffer termination reaction;
(5) under the determined wavelength of 450nm, in microplate reader, read the OD value of each micropore respectively, concrete outcome see table 4,
Detected result under the different elutriant extension rate of table 4
By comparing OD value, to judge anti-Cd antibody-hrp-antibody complex wash-out degree that ELISA hole wall combines, when OD value is minimum, anti-Cd antibody-hrp-antibody complex wash-out degree reaches maximum.As shown in table 4, work as papoid: the multiple proportions of enzyme labelled antibody is 1:20, anti-Cd antibody-hrp-antibody complex wash-out degree reaches maximum.And action time is when being 1h, 2h, 3h, each group of OD value change is little, the visible prolongation along with the time, enzyme activity weakens gradually, when enzyme concn is constant, extends digestion time and can not improve digestibility, so in this experiment the action time of elutriant be that 1-3h all can, in sum, we select elutriant 1:20 as the suitableeest working concentration, and 1-3h is as the suitableeest elution time.
Application Example
application Example 1
Whole blood extraction method is adopted to extract cadmium-vldl inner complex, employing euzymelinked immunosorbent assay (ELISA) (ELISA method) detects the cadmium-vldl inner complex in 100 parts of sample blood plasma, namely the method adopting specific embodiment method one to record detects, and concrete operation step is as follows:
1) bag quilt: be coated on solid phase carrier by anti-vldl antibody, be diluted to 1000 times by dilution buffer, adds in elisa plate micropore, preserves 4 DEG C of storages in refrigerator after 1 hour for 37 DEG C;
2) close: remove dilution buffer, washing, adds confining liquid, and place 1 hour, remove confining liquid for 37 DEG C, washing, elisa plate 37 DEG C places 4 DEG C of storages in refrigerator after 1 hour;
3) application of sample: using sample blood plasma as sample to be tested, makes standard substance with the cadmium of known content-vldl inner complex, by dilution buffer, sample to be tested and standard substance is all diluted to 10 times, adds in micropore, and 37 DEG C act on 1 hour;
4) add two to resist: remove sample, washing, add the anti-Cd antibody being diluted to 12500 times by dilution buffer, 37 DEG C of effects 1 hour, make the cadmium metal in itself and vldl react;
5) enzyme-added mark: remove anti-Cd antibody, washing, adds the enzyme labelled antibody that antibody concentration is 2 μ g/mL, and 37 DEG C act on 1 hour, make itself and anti-Cd antibody response;
6) substrate incubation: remove enzyme labelled antibody, washing, add substrate, 37 DEG C of lucifuge effect 30min, enter stop buffer;
7) detect: the OD value reading sample to be tested group and standard substance under 450nm wavelength in microplate reader respectively, cross and compare with standard substance group, try to achieve the content of cadmium in sample to be tested according to standard equation, result is as shown in table 5.
The measured result of table 5 method a pair 100 parts of plasma samples
In this application embodiment 1, step 7) in, microplate reader also can not be used to detect, but directly carry out qualitative detection by dyeing.
application Example 2
Adopt enzyme linked immunological and atomic absorption spectrum combined techniques (ELISA method+AAS method) to detect cadmium-vldl inner complex in 100 parts of sample blood plasma, the method namely adopting specific embodiment method two to record detects, and concrete operation step is as follows:
1) bag quilt: anti-vldl antibody is coated on solid phase carrier, with dilution buffer dilution coating protein to 1000 times, add in elisa plate micropore, 4 DEG C are spent the night 18 hours;
2) close: remove dilution buffer, washing, adds confining liquid, places 1 hour, removes confining liquid for 37 DEG C, washing, preserve at elisa plate 4 DEG C;
3) application of sample: make sample to be tested with sample blood plasma, makes standard substance with the cadmium of known content-vldl inner complex, by dilution buffer, sample to be tested and standard substance is diluted to 10 times, add in micropore, and 37 DEG C act on 1 hour;
4) wash-out: remove test plasma sample, washing, adds the Na of 0.8mol/L 2hPO 4solution, 37 DEG C act on 2 hours;
5) detect: from ELISA micropore, get appropriate amount of fluid, detect the cadmium of chelating in vldl in Atomic Absorption Spectroscopy AAS, result is as shown in table 6.
Table 6 method two is to the measured result of 100 parts of plasma samples
Numbering 1 2 3 4 5 6 7 8 9 10
μg/L 0.087 0.083 0.091 0.098 0.173 0.017 0.086 0.088 0.007 0.027
Numbering 11 12 13 14 15 16 17 18 19 20
μg/L 0.048 0.157 0.045 0.007 0.079 0.019 0.052 0.139 0.064 0.088
Numbering 21 22 23 24 25 26 27 28 29 30
μg/L 0.065 0.025 0.021 0.078 0.095 0.095 0.086 0.046 0.013 0.004
Numbering 31 32 33 34 35 36 37 38 39 40
μg/L 0.083 0.038 0.145 0.039 0.076 0.079 0.069 0.071 0.068 0.024
Numbering 41 42 43 44 45 46 47 48 49 50
μg/L 0.059 0.018 0.073 0.074 0.027 0.098 0.005 0.029 0.035 0.032
Numbering 51 52 53 54 55 56 57 58 59 60
μg/L 0.049 0.082 0.104 0.058 0.01 0.043 0.127 0.039 0.003 0.055
Numbering 61 62 63 64 65 66 67 68 69 70
μg/L 0.022 0.068 0.081 0.048 0.111 0.099 0.047 0.024 0.068 0.061
Numbering 71 72 73 74 75 76 77 78 79 80
μg/L 0.071 0.021 0.147 0.016 0.059 0.022 0.121 0.057 0.05 0.015
Numbering 81 82 83 84 85 86 87 88 89 90
μg/L 0.062 0.083 0.069 0.006 0.06 0.079 0.062 0.073 0.076 0.08
Numbering 91 92 93 94 95 96 97 98 99 100
μg/L 0.054 0.026 0.025 0.084 0.078 0.039 0.017 0.046 0.164 0.044
application Example 3:
Enzyme linked immunological and inductivity coupled plasma mass spectrometry combined techniques (ELISA method+ICP-MS method) is adopted to detect cadmium-vldl inner complex in 100 parts of sample blood plasma, namely the method adopting specific embodiment method three to record detects, and concrete operation step is as follows:
1) bag quilt: be coated on solid phase carrier by anti-vldl antibody, with dilution buffer dilution coating protein to 1000 times, adds in elisa plate micropore, preserves 18 hours for 4 DEG C;
2) close: remove dilution buffer, washing, adds confining liquid, places 1 hour, removes confining liquid for 37 DEG C, washing, elisa plate 4 DEG C preservation;
3) application of sample: make sample to be tested with sample blood plasma, makes standard substance with the cadmium of known content-vldl inner complex, by dilution buffer, sample to be tested and standard substance is diluted to 10 times, add in micropore, and 37 DEG C act on 2 hours;
4) wash-out: remove sample to be tested and standard substance, washing, adds the Na of 0.8mol/L 2hPO 4solution, 37 DEG C of wash-outs 2 hours;
5) acidifying: add nitric acid in the solution and carry out acidifying to solution, sealing is spent the night, and thorough acidifying, adds hydrogen peroxide, and acid is caught up with in heating;
6) detect: sample and detect the cadmium of chelating in vldl under icp ms, result is as shown in table 7.
Table 7 method three is to the measured result of 100 parts of samples
Numbering 1 2 3 4 5 6 7 8 9 10
μg/L 0.082 0.044 0.079 0.07 0.039 0.014 0.024 0.031 0.012 0.093
Numbering 11 12 13 14 15 16 17 18 19 20
μg/L 0.036 0.051 0.013 0.083 0.037 0.01 0.008 0.091 0.073 0.056
Numbering 21 22 23 24 25 26 27 28 29 30
μg/L 0.066 0.028 0.073 0.086 0.078 0.077 0.063 0.083 0.092 0.089
Numbering 31 32 33 34 35 36 37 38 39 40
μg/L 0.067 0.085 0.066 0.061 0.002 0.068 0.066 0.089 0.014 0.084
Numbering 41 42 43 44 45 46 47 48 49 50
μg/L 0.074 0.051 0.056 0.073 0.066 0.053 0.036 0.008 0.093 0.051
Numbering 51 52 53 54 55 56 57 58 59 60
μg/L 0.067 0.041 0.099 0.112 0.021 0.07 0.095 0.032 0.06 0.018
Numbering 61 62 63 64 65 66 67 68 69 70
μg/L 0.092 0.082 0.045 0.012 0.076 0.004 0.085 0.046 0.019 0.066
Numbering 71 72 73 74 75 76 77 78 79 80
μg/L 0.078 0.091 0.036 0.03 0.066 0.098 0.094 0.048 0.059 0.053
Numbering 81 82 83 84 85 86 87 88 89 90
μg/L 0.086 0.077 0.048 0.046 0.109 0.006 0.057 0.035 0.065 0.089
Numbering 91 92 93 94 95 96 97 98 99 100
μg/L 0.035 0.088 0.093 0.112 0.023 0.034 0.026 0.012 0.094 0.097
Above-mentioned embodiment is only the preferred embodiment of the present invention; can not limit the scope of protection of the invention with this, change and the replacement of any unsubstantiality that those skilled in the art does on basis of the present invention all belong to the present invention's scope required for protection.

Claims (8)

1. cadmium-vldl inner complex, is characterized in that, this cadmium-vldl inner complex be cadmium ion and vldl by sulfydryl or/and cysteine residues chelating forms.
2. the preparation method of cadmium-vldl inner complex as claimed in claim 1, comprises the following steps:
A) synthesis of cadmium-vldl: add cadmium ion and carry out chelatropic reaction purifying in the vldl that comes from human body or the vldl according to biological method restructuring, obtain reaction soln;
B) cadmium-vldl inner complex purifying: adopt immune-affinity chromatography, removal step A) unreacted vldl, specific antibody and cadmium ion in reaction soln, obtain cadmium-vldl inner complex.
3. method as claimed in claim 2, is characterized in that,
Described step B) in specifically comprise the following steps:
(1) sample dissolution: by above-mentioned steps A) the cadmium-vldl inner complex of extraction be dissolved in physiological saline, obtain the solution of cadmium-vldl inner complex;
(2) balance chromatography column: use dilution buffer to rinse the pipeline of chromatography column, load in chromatography column can with the filler of vldl specific binding, after dress post, continue to use dilution buffer balance chromatography column;
(3) loading: after chromatography column balance, with the solution of dilution buffer dilution step (1), then upper prop, make vldl and filler specific binding;
(4) wash-out: use dilution buffer to rinse chromatography column and balance to baseline, then use the Na of 0.05-0.10mol/L 2hPO 4solution carries out wash-out;
(5) collect: the elutriant collecting step (4), makes albumen restore immediately after collection;
(6) dialyse: by the elutriant of the collection in step (5), dress dialysis tubing, uses ddH 2o dialyses desalination, and after changing water three times, 4 DEG C of dialysed overnight, collect sample;
(7) balance chromatography column: adopt new chromatography column, use dilution buffer flushing pipeline, in this chromatography column load can with the filler of cadmium specific binding, dress post after balance chromatography column by dilution buffer again;
(8) loading: after chromatography column balance, with sample, then upper prop in dilution buffer dilution step (6);
(9) wash-out: use dilution buffer to rinse chromatography column and balance to baseline, then use the Na of 0.5-1.0mol/L 2hPO 4solution carries out wash-out;
(10) collect: the elutriant collecting step (9), makes albumen restore immediately after collection;
(11) dialyse: by the elutriant of step (10), dress dialysis tubing, uses ddH 2o dialyses desalination, and after changing water three times, 4 DEG C of dialysed overnight, collect sample, obtain cadmium-vldl inner complex.
4. the preparation method of cadmium according to claim 2-vldl inner complex, is characterized in that, step B) after also comprise step C): to the qualification of cadmium-vldl inner complex;
Wherein, step C) in specifically comprise the following steps:
(1) glue bed is prepared: prepare glue bed using the one in sepharose, polyacrylamide gel as medium;
(2) application of sample: get step B) in cadmium-vldl inner complex of obtaining of extraction purification, add sample-loading buffer, and mix, then application of sample is in sample cell;
(3) electrophoresis: connect electrophoresis plate, carry out electrophoresis;
(4) detect: on glue bed, find out the protein band containing cadmium, this protein band is taken out, protein band is dissolved, and then adopt ICP-MS or AAS whether to detect in this liquid containing cadmium and the content detecting cadmium.
5. the application of cadmium as claimed in claim 1-vldl inner complex in the reagent or test kit preparing to detect cadmium-vldl inner complex in blood sample.
6. one kind at least comprises the test kit of cadmium as claimed in claim 1-vldl inner complex as standard substance.
7. test kit according to claim 6, is characterized in that, also comprises coating buffer, and this coating buffer contains the material of catching vldl or the material of catching cadmium metal.
8. the method for detection by quantitative cadmium-vldl inner complex, it is characterized in that, using the cadmium according to claim 1-vldl inner complex of known content as standard substance, a pair sample of following methods is adopted to detect: euzymelinked immunosorbent assay (ELISA), enzyme linked immunological and atomic absorption spectrum combined techniques, enzyme linked immunological and inductivity coupled plasma mass spectrometry combined techniques, purification cadmium-vldl inner complex and enzyme linked immunological combined techniques, purification cadmium-vldl inner complex and atomic absorption spectrum combined techniques, purification cadmium-vldl inner complex and inductivity coupled plasma mass spectrometry combined techniques, electrophoresis and enzyme linked immunological or atomic absorption spectrum or inductivity coupled plasma mass spectrometry combined techniques.
CN201510411288.6A 2015-07-14 2015-07-14 Cadmium-very low density lipoprotein chelate as well as preparation method and application thereof Pending CN104987393A (en)

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