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當(dāng)前位置:廈門慧嘉生物科技有限公司>>技術(shù)文章>>(中英文) 人C反應(yīng)蛋白(CRP)Elisa kit操作說明書
Human C-Reactive
Protein,CRP
ELISA Kit
Catalog No. CSB-E07921h
(96 T)
This immunoassay kit allows for the in vitro quantitative determination of human
CRP concentrations in serum, plasma and other biological fluids.
Expiration date six months from the date of manufacture
FOR RESEARCH USE ONLY. NOT FOR USE IN DIAGNOSTIC PROCEDURES.
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INTRODUCTION
C-reactive protein (CRP) is a protein found in the blood in response to
inflammation (an acute-phase protein). CRP is synthesized by the liver in
response to factors released by fat cells (adipocytes). It is a member of the
pentraxin family of proteins. CRP is a member of the class of acute-phase
reactants as its levels rise dramatically during inflammatory processes
occurring in the body. This increment is due to a rise in the plasma
concentration of IL-6, which is produced predominantly by macrophages
as well as adipocytes. CRP binds to phosphocholine on microbes. It is
thought to assist in complement binding to foreign and damaged cells and
enhances phagocytosis by macrophages, which express a receptor for
CRP. It is also believed to play another important role in innate immunity, as
an early defense system against infections. CRP rises up to 50,000-fold in
acute inflammation, such as infection. It rises above normal limits within 6
hours, and peaks at 48 hours. Its half-life is constant, and therefore its
level is mainly determined by the rate of production (and hence the severity
of the precipitating cause). Serum amyloid A is a related acute-phase
marker that responds rapidly in similar circumstances. To measure the CRP
level, a "high-sensitivity" CRP or hs-CRP test needs to be performed and
analyzed by a laboratory. This is an automated blood test designed for
greater accuracy in measuring low levels of CRP, which allows the
physician to assess cardiovascular risk.
PRINCIPLE OF THE ASSAY
The microtiter plate provided in this kit has been pre-coated with an
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antibody specific to CRP. Standards or samples are then added to the
appropriate microtiter plate wells with a HRP-conjugated antibody
preparation specific for CRP to each microplate well and incubated. Then a
TMB (3,3',5,5' tetramethyl-benzidine) substrate solution is added to each
well. Only those wells that contain CRP, HRP-conjugated antibody will
exhibit a change in color. The enzyme-substrate reaction is terminated by
the addition of a sulphuric acid solution and the color change is measured
spectrophotometrically at a wavelength of 450 nm ± 2 nm. The
concentration of CRP in the samples is then determined by comparing the
O.D. of the samples to the standard curve.
DETECTION RANGE
0.625 ng/ml-40 ng/ml. The standard curve concentrations used for the
ELISA’s were 40 ng/ml, 20 ng/ml, 10 ng/ml,5 ng/ml, 2.5 ng/ml, 1.25 ng/ml,
0.625ng/ml.
SPECIFICITY
This assay recognizes recombinant and natural human CRP. No significant
cross-reactivity or interference was observed.
SENSITIVITY
The minimum detectable dose of human CRP is typically less than 0.156
ng/ml.
The sensitivity of this assay, or Lower Limit of Detection (LLD) was defined
as the lowest protein concentration that could be differentiated from zero.
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MATERIALS PROVIDED
Reagent Quantity
Assay plate 1
Standard 2
Sample Diluent 4 x 20 ml
HRP-conjugate Diluent 1 x 10 ml
HRP-conjugate 1 x 120µl
Wash Buffer
1 x 20 ml
(25×concentrate)
TMB Substrate 1 x 10 ml
Stop Solution 1 x 10 ml
STORAGE
1. Unopened test kits should be stored at 2-8°C upon receipt and the
microtiter plate should be kept in a sealed bag with desiccants to
minimize exposure to damp air. The test kit may be used throughout the
expiration date of the kit. Refer to the package label for the expiration
date.
2. A microtiter plate reader with a bandwidth of 10 nm or less and an
optical density range of 0-3 OD or greater at 450nm wavelength is
acceptable for use in absorbance measurement.
REAGENT PREPARATION
Bring all reagents to room temperature before use for 30min.
1. Wash Buffer If crystals have formed in the concentrate, warm up to
room temperature and mix gently until the crystals have compley
dissolved. Dilute 20 ml of Wash Buffer Concentrate into deionized or
distilled water to prepare 500 ml of Wash Buffer.
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2. Standard Centrifuge the standard vial at 6000-10000rpm for 30s.
Reconstitute the Standard with 1.0 ml of Sample Diluent. This
reconstitution produces a stock solution of 40 ng/ml. Allow the standard
to sit for a minimum of 15 minutes with gentle agitation prior to making
serial dilutions. The undiluted standard serves as the high standard (40
ng/ml). The Sample Diluent serves as the zero standard (0 ng/ml).
Prepare fresh for each assay. Use within 4 hours and discard after use.
3. HRP-conjugate Dilute to the working concentration using
HRP-conjugate Diluent(1:100), respectively. The suggested 100-fold
dilution can be achieved by adding 10 uL HRP-conjugate to 990uL of
HRP-conjugate Diluent for 1ml working solution.
OTHER SUPPLIES REQUIRED
Microplate reader capable of measuring absorbance at 450 nm, with
the correction wavelength set at 540 nm or 570 nm.
Pipettes and pipette tips.
Deionized or distilled water.
Squirt bottle, manifold dispenser, or automated microplate washer.
SAMPLE COLLECTION AND STORAGE
Serum Use a serum separator tube (SST) and allow samples to clot
for 30 minutes before centrifugation for 15 minutes at 1000 x g. Remove
serum and assay immediay or aliquot and store samples at -20° C.
Avoid repeated freeze-thaw cycles.
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Plasma Collect plasma using citrate, EDTA, or heparin as an
anticoagulant. Centrifuge for 15 minutes at 1000 x g within 30 minutes
of collection. Assay immediay or aliquot and store samples at-20°C.
Avoid repeated freeze-thaw cycles.
Note: Grossly hemolyzed samples are not suitable for use in this assay.
If samples generate values higher than the highest standard, dilute the samples
with the Sample Diluent and repeat the assay.
SAMPLE PREPARTION
Normal human serum samples require a 1000-fold dilution into Sample
Diluent. The suggested 1000-fold dilution can be achieved by adding 5µl
sample to 95µl of Sample Diluent. Complete the 1000-fold dilution by
adding 5µl of this solution to 245µl of Sample Diluent. The recommended
dilution factor is for reference only. The optimal dilution factor should be
determined by users according to their particular experiments.
As CRP levels increase widely, the patient serum samples are
recommended to dilute 1:1000-1:30000 times before test. The
recommended dilution factor is for reference only. The optimal dilution
factor should be determined by users according to their particular
experiments.
ASSAY PROCEDURE
Bring all reagents and samples to room temperature before use. It is
recommended that all samples, standards, and controls be assayed in duplicate.
All the reagents should be added directly to the liquid level in the well. The
pipette should avoid contacting the inner wall of the well.
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1. Add 100µl Sample Diluent serves as the zero standard, Add 100µl of
Standard or Sample per well. Cover with the adhesive strip. Incubate for
60min at 37°C.
2. Aspirate each well and wash, repeating the process three times for a
total of three washes. Wash by filling each well with Wash Buffer (200µl)
using a squirt bottle, multi-channel pipette, manifold dispenser or
autowasher. Complete removal of liquid at each step is essential to
good performance. After the last wash, remove any remaining Wash
Buffer by aspirating or decanting. Invert the plate and blot it against
clean paper towels.
3. Add 100µl of HRP-conjugate working solution to each well. Incubate
for 60min at 37°C. HRP-conjugate working solution may appear cloudy.
Warm up to room temperature and mix gently until solution appears
uniform.
4. Repeat the aspiration and wash five times as before.
5. Add 90µl of TMB Substrate to each well. Incubate for 20 minutes at
37°C. Keeping the plate away from drafts and other temperature
fluctuations in the dark.
6. Add 50µl of Stop Solution to each well when the first four wells
containing the highest concentration of standards develop obvious blue
color. If color change does not appear uniform, gently tap the plate to
ensure thorough mixing.
7. Determine the optical density of each well within 30 minutes, using a
microplate reader set to 450 nm.
CALCULATION OF RESULTS
Using the professional soft "Curve Exert 1.3" to make a standard curve is
recommended, which can be downloaded from our web.
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Average the duplicate readings for each standard, control, and sample and
subtract the average zero standard optical density. Create a standard curve
by reducing the data using computer software capable of generating a four
parameter logistic (4-PL) curve-fit. As an alternative, construct a standard
curve by plotting the mean absorbance for each standard on the y-axis
against the concentration on the x-axis and draw a best fit curve through the
points on the graph. The data may be linearized by plotting the log of the
CRP concentrations versus the log of the O.D. and the best fit line can be
determined by regression analysis. This procedure will produce an
adequate but less precise fit of the data. If samples have been diluted, the
concentration read from the standard curve must be multiplied by the
dilution factor.
LIMITATIONS OF THE PROCEDURE
The kit should not be used beyond the expiration date on the kit label.
Do not mix or substitute reagents with those from other lots or sources.
Any variation in operator, pipetting technique, washing technique,
incubation time or temperature, and kit age can cause variation in
binding.
This assay is designed to eliminate interference by soluble receptors,
binding proteins, and other factors present in biological samples. Until
all factors have been tested in the Immunoassay, the possibility of
interference cannot be excluded.
TECHNICAL HINTS
When mixing or reconstituting protein solutions, always avoid foaming.
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To avoid cross-contamination, change pipette tips between additions of
each standard level, between sample additions, and between reagent
additions. Also, use separate reservoirs for each reagent.
When using an automated plate washer, adding a 30 second soak
period following the addition of wash buffer, and/or rotating the plate
180 degrees between wash steps may improve assay precision.
To ensure accurate results, proper adhesion of plate sealers during
incubation steps is necessary.
Substrate Solution should remain colorless until added to the plate.
Keep Substrate Solution protected from light. Substrate Solution should
change from colorless to gradations of blue.
Stop Solution should be added to the plate in the same order as the
Substrate Solution. The color developed in the wells will turn from blue
to yellow upon addition of the Stop Solution. Wells that are green in
color indicate that the Stop Solution has not mixed thoroughly with the
Substrate Solution.
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人 人人 人 C 反應(yīng)蛋白 反應(yīng)蛋白 反應(yīng)蛋白 反應(yīng)蛋白(CRP)酶聯(lián)免疫分析 酶聯(lián)免疫分析 酶聯(lián)免疫分析 酶聯(lián)免疫分析
試劑盒使用說明書 試劑盒使用說明書 試劑盒使用說明書 試劑盒使用說明書
本試劑盒僅供研究使用 本試劑盒僅供研究使用 本試劑盒僅供研究使用 本試劑盒僅供研究使用
產(chǎn)品編號 產(chǎn)品編號 產(chǎn)品編號 產(chǎn)品編號: :: :CSB-E07921h
檢測范圍 檢測范圍 檢測范圍 檢測范圍: :: :0.625 ng/ml – 40 ng /ml
zui低檢測限 zui低檢測限 zui低檢測限 zui低檢測限: :: :0.156 ng/ml
特異性 特異性 特異性 特異性: :: :本試劑盒可同時檢測天然或重組的人 CRP,且與其他相關(guān)蛋白無
交叉反應(yīng)。
有效期 有效期 有效期 有效期: :: :6 個月
預(yù)期應(yīng)用 預(yù)期應(yīng)用 預(yù)期應(yīng)用 預(yù)期應(yīng)用: :: :ELISA法定量測定人血清、血漿中 CRP 含量。
說明 說明 說明 說明
1. 試劑盒保存: 2-8℃。
2. 中、英文說明書可能會有不一致之處,請以英文說明書為準(zhǔn)。
3. 剛開啟的酶聯(lián)板孔中可能會含有少許水樣物質(zhì),此為正?,F(xiàn)象,不會對實(shí)
驗(yàn)結(jié)果造成任何影響。
實(shí)驗(yàn)原理 實(shí)驗(yàn)原理 實(shí)驗(yàn)原理 實(shí)驗(yàn)原理
用純化的抗體包被微孔板,制成固相載體,往包被抗 CRP 抗體的微孔中
加入標(biāo)本或標(biāo)準(zhǔn)品、HRP 標(biāo)記的抗 CRP 抗體,經(jīng)過*洗滌后用底物顯色。
底物在過氧化物酶的催化下轉(zhuǎn)化成藍(lán)色,并在酸的作用下轉(zhuǎn)化成zui終的黃色。
顏色的深淺和樣品中的 CRP 呈正相關(guān)。用酶標(biāo)儀在 450nm 波長下測定吸光
度(OD值),計算樣品濃度。
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試劑盒組成及試劑配制 試劑盒組成及試劑配制 試劑盒組成及試劑配制 試劑盒組成及試劑配制
1. 酶聯(lián)板 酶聯(lián)板 酶聯(lián)板 酶聯(lián)板(Assay plate ): 一塊 (96孔)。
2. 標(biāo)準(zhǔn)品 標(biāo)準(zhǔn)品 標(biāo)準(zhǔn)品 標(biāo)準(zhǔn)品 (Standard): 2 瓶(凍干品)。
3. 酶結(jié)合物 酶結(jié)合物 酶結(jié)合物 酶結(jié)合物( (( (HRP-conjugate) )) ) : 1 x 120µl /瓶。
4. 酶結(jié)合物稀釋液 酶結(jié)合物稀釋液 酶結(jié)合物稀釋液 酶結(jié)合物稀釋液(HRP-conjugate Diluent) : 1×10ml/瓶。
5. 樣品稀釋液 樣品稀釋液 樣品稀釋液 樣品稀釋液(Sample Diluent): 1×20ml/瓶。
6. 底物溶液 底物溶液 底物溶液 底物溶液 ( (( (TMB Substrate) )) ): 1×10ml/瓶。
7. 濃洗滌液 濃洗滌液 濃洗滌液 濃洗滌液( (( (Wash Buffer) )) ) 1×20ml/瓶,使用時每瓶用蒸餾水稀釋 25 倍。
8. 終止液 終止液 終止液 終止液( (( (Stop Solution) )) ): 1×10ml/瓶。
需要而未提供的試劑和器材 需要而未提供的試劑和器材 需要而未提供的試劑和器材 需要而未提供的試劑和器材
1. 標(biāo)準(zhǔn)規(guī)格酶標(biāo)儀
2. 高速離心機(jī)
3. 電熱恒溫培養(yǎng)箱
4. 干凈的試管和 Eppendof 管
5. 系列可調(diào)節(jié)移液器及吸頭,一次檢測樣品較多時,用多通道移液器
6. 蒸餾水,容量瓶等
標(biāo)本的采集及保存 標(biāo)本的采集及保存 標(biāo)本的采集及保存 標(biāo)本的采集及保存
1. 血清:全血標(biāo)本請于室溫放置 2 小時或 4℃過夜后于 1000 x g離心 20 分
鐘,取上清即可檢測,或?qū)?biāo)本放于-20℃或-80℃保存,但應(yīng)避免反復(fù)凍
融。
2. 血漿:可用 EDTA 或肝素作為抗凝劑,標(biāo)本采集后 30 分鐘內(nèi)于 2 - 8° C
1000 x g離心 15 分鐘,或?qū)?biāo)本放于-20℃或-80℃保存,但應(yīng)避免反復(fù)
凍融。
注 注注 注: :: :標(biāo)本溶血會影響zui后檢測結(jié)果 標(biāo)本溶血會影響zui后檢測結(jié)果 標(biāo)本溶血會影響zui后檢測結(jié)果 標(biāo)本溶血會影響zui后檢測結(jié)果, ,, ,因此溶血標(biāo)本不宜進(jìn)行此項檢測 因此溶血標(biāo)本不宜進(jìn)行此項檢測 因此溶血標(biāo)本不宜進(jìn)行此項檢測 因此溶血標(biāo)本不宜進(jìn)行此項檢測。 。。 。
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樣本稀釋倍數(shù) 樣本稀釋倍數(shù) 樣本稀釋倍數(shù) 樣本稀釋倍數(shù)
正常人血清推薦 1:1000 倍稀釋后用于檢測。具體操作如下:取 5µl 樣本加入
到 95µl 的樣本稀釋液(1:20 稀釋)中混勻,再從上述稀釋液中取 5µl加入到
245µl 樣本稀釋液 (1:50 稀釋)中混勻。得到的即為 1:1000 倍稀釋后的樣本。
此推薦稀釋倍數(shù)僅供參考,用戶應(yīng)根據(jù)實(shí)驗(yàn)自行確定其*稀釋倍數(shù)。
因發(fā)病時 CRP 含量有不同程度增高,推薦對病人血清進(jìn)行 1:1000-1:30000
倍稀釋。各實(shí)驗(yàn)室應(yīng)當(dāng)通過預(yù)實(shí)驗(yàn)確定zui合適的稀釋倍數(shù)。
標(biāo)準(zhǔn)品的稀釋原則 標(biāo)準(zhǔn)品的稀釋原則 標(biāo)準(zhǔn)品的稀釋原則 標(biāo)準(zhǔn)品的稀釋原則: :: :2 瓶,使用前于 6000-10000rpm 離心 30 秒。 每
瓶臨用前以樣品稀釋液稀釋至 1ml,蓋好后靜置 10 分鐘以上,然后反復(fù)顛倒
/搓動以助溶解,其濃度為 40ng/ml,做系列倍比稀釋后,分別稀釋 40 ng/ml,
20 ng/ml, 10 ng/ml,5 ng/ml, 2.5 ng/ml, 1.25 ng/ml, 0.625 ng/ml,樣品稀釋液
直接作為標(biāo)準(zhǔn)濃度 0 ng/ml,臨用前 15 分鐘內(nèi)配制,用完丟棄,下次檢測使
用新鮮配置的標(biāo)準(zhǔn)品。
如配制 20ng/ml 標(biāo)準(zhǔn)品:取 0.5ml(不要少于 0.5ml)40ng/ml 的上述標(biāo)準(zhǔn)品
加入含 0.5ml樣品稀釋液的 Eppendorf 管中,混勻即可,其余濃度以此類推。
酶結(jié)合 酶結(jié)合 酶結(jié)合 酶結(jié)合物 物物 物的稀釋原則 的稀釋原則 的稀釋原則 的稀釋原則: :: :
打開瓶蓋前請離心,收集瓶壁上的溶液。臨用前用酶結(jié)合物稀釋液 酶結(jié)合物稀釋液 酶結(jié)合物稀釋液 酶結(jié)合物稀釋液稀釋,稀
釋前根據(jù)預(yù)先計算好的每次實(shí)驗(yàn)所需的總量配制(每孔 100µl),實(shí)際配制時
應(yīng)多配制 0.1-0.2ml。如 10µl 酶結(jié)合物 酶結(jié)合物 酶結(jié)合物 酶結(jié)合物加990µl 酶結(jié)合物稀釋液 酶結(jié)合物稀釋液 酶結(jié)合物稀釋液 酶結(jié)合物稀釋液 的比例配制,
輕輕混勻,在使用前一小時內(nèi)配制。
操作步驟 操作步驟 操作步驟 操作步驟
實(shí)驗(yàn)開始前,請?zhí)崆芭渲煤盟性噭?,試劑或樣品稀釋時,均需混勻,混勻
時盡量避免起泡。每次檢測都應(yīng)該做標(biāo)準(zhǔn)曲線。如樣品濃度過高時,用樣品
稀釋液進(jìn)行稀釋,以使樣品符合試劑盒的檢測范圍。
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1. 加樣:分別設(shè)標(biāo)準(zhǔn)孔、待測樣品孔。加 100µl 樣品稀釋液作為標(biāo)準(zhǔn)品 S0
孔。余孔分別加標(biāo)準(zhǔn)品或待測樣品 100µl,注意不要有氣泡,加樣將樣品
加于酶標(biāo)板孔底部,盡量不觸及孔壁,輕輕晃動混勻,酶標(biāo)板加上蓋或覆
膜,37℃反應(yīng) 60 分鐘。
2. 溫育后,棄去孔內(nèi)液體,甩干,洗板 3 次,每次浸泡 1-2 分鐘,200µl/
每孔,甩干, zui后用力在洗水紙上拍干。
3. 每孔加酶結(jié)合物 100µl,空白孔不加?;靹?,37℃,60 分鐘。
4. 溫育后,棄去孔內(nèi)液體,甩干,洗板 5 次,每次浸泡 1-2 分鐘,200µl/
每孔,甩干,zui后用力在洗水紙上拍干。
5. 依序每孔加底物溶液 90µl,37℃避光顯色20分鐘。
6. 依序每孔加終止溶液 50µl,終止反應(yīng)(此時藍(lán)色立轉(zhuǎn)黃色)。終止液的加
入順序應(yīng)盡量與底物液的加入順序相同。為了保證實(shí)驗(yàn)結(jié)果的準(zhǔn)確性,底
物反應(yīng)時間到后應(yīng)盡快加入終止液。
7. 用酶聯(lián)儀在 450nm 波長依序測量各孔的光密度(OD 值)。 在加終止液
后 15 分鐘以內(nèi)進(jìn)行檢測。
實(shí)驗(yàn)備注 實(shí)驗(yàn)備注 實(shí)驗(yàn)備注 實(shí)驗(yàn)備注
1. 用戶在初次使用試劑盒時,應(yīng)將各種試劑管離心數(shù)分鐘,以便試劑集中到
管底。
2. 每次實(shí)驗(yàn)留一孔作為空白調(diào)零孔,該孔不加任何試劑,只是zui后加底物溶
液及終止液。測量時先用此孔調(diào) OD值至零。
3. 為防止樣品蒸發(fā),試驗(yàn)時將反應(yīng)板放于鋪有濕布的密閉盒內(nèi),酶標(biāo)板加上
蓋或覆膜。
4. 未使用完的酶標(biāo)板或者試劑,請于 2-8℃保存。
5. 建議檢測樣品時均設(shè)雙孔測定,以保證檢測結(jié)果的準(zhǔn)確性。
洗板方法 洗板方法 洗板方法 洗板方法
手工洗板方法:吸去(不可觸及板壁)或甩掉酶標(biāo)板內(nèi)的液體;在實(shí)驗(yàn)臺上
鋪墊幾層吸水紙,酶標(biāo)板朝下用力拍幾次;將推薦的洗滌緩沖液至少 0.3ml
注入孔內(nèi),浸泡 1-2 分鐘。根據(jù)需要,重復(fù)此過程數(shù)次。
自動洗板:如果有自動洗板機(jī),應(yīng)在熟練使用后再用到正式實(shí)驗(yàn)過程中。
14
計算 計算 計算 計算
以標(biāo)準(zhǔn)物的濃度為橫坐標(biāo)(對數(shù)坐標(biāo)),OD值為縱坐標(biāo)(普通坐標(biāo)),在半對
數(shù)坐標(biāo)紙上繪出標(biāo)準(zhǔn)曲線,根據(jù)樣品的 OD 值由標(biāo)準(zhǔn)曲線查出相應(yīng)的濃度;
再乘以稀釋倍數(shù);或用標(biāo)準(zhǔn)物的濃度與 OD 值計算出標(biāo)準(zhǔn)曲線的直線回歸方
程式,將樣品的 OD 值代入方程式,計算出樣品濃度,再乘以稀釋倍數(shù),即
為樣品的實(shí)際濃度。
注意事項 注意事項 注意事項 注意事項
1. 當(dāng)混合蛋白溶液時應(yīng)盡量輕緩,避免起泡。
2. 洗滌過程非常重要,不充分的洗滌易造成假陽性。
3. 一次加樣時間控制在 5 分鐘內(nèi),如標(biāo)本數(shù)量多,推薦使用排槍加樣。
4. 請每次測定的同時做標(biāo)準(zhǔn)曲線,做復(fù)孔。
5. 如標(biāo)本中待測物質(zhì)含量過高,請先稀釋后再測定,計算時請zui后乘以稀釋
倍數(shù)。
6. 底物請避光保存。
7. 不要用其它生產(chǎn)廠家的試劑替換試劑盒中的試劑。
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