本试剂盒只能用于科学研究，不得用于医学诊断

黄曲霉毒素M1（Aflatoxin M1）ELISA检测试剂盒

使用说明书

检测原理

试剂盒采用竞争法酶联免疫吸附试验（ELISA）。往预先包被黄曲霉毒素M1的包被微孔中，依次加入标本、标准品、HRP标记的竞争抗原，经过温育并彻底洗涤。用底物TMB显色，TMB在过氧化物酶的催化下转化成蓝色，并在酸的作用下转化成最终的黄色。颜色的深浅和样品中的黄曲霉毒素M1（Aflatoxin M1）呈负相关。用酶标仪在450nm 波长下测定吸光度（OD 值），计算样品浓度。

样品收集、处理及保存方法

1.  血清：使用不含热原和内毒素的试管，操作过程中避免任何细胞刺激，收集血液后，3000转离心10分钟将血清和红细胞迅速小心地分离。

2.  血浆：EDTA、柠檬酸盐或肝素抗凝。3000转离心30分钟取上清。

3.  细胞上清液：3000转离心10分钟去除颗粒和聚合物。

4.  组织匀浆：将组织加入适量生理盐水捣碎。3000转离心10分钟取上清。

5.  保存：如果样本收集后不及时检测，请按一次用量分装，冻存于-20℃，避免反复冻融，在室温下解冻并确保样品均匀地充分解冻。

自备物品

1. 酶标仪（450nm）

2. 高精度加样器及枪头：0.5-10uL、2-20uL、20-200uL、200-1000uL

3. 37℃恒温箱

操作注意事项

1.   试剂盒保存在2-8℃，使用前室温平衡20分钟。从冰箱取出的浓缩洗涤液会有结晶，这属于正常现象，水浴加热使结晶完全溶解后再使用。

2.   实验中不用的板条应立即放回自封袋中，密封（低温干燥）保存。

3.   按照说明书操作时样本已经稀释5倍，最终结果乘以5才是样本实际浓度。

4.   严格按照说明书中标明的时间、加液量及顺序进行温育操作。

5.   所有液体组分使用前充分摇匀。

试剂盒组成

注：标准品（S0-S5）浓度依次为：0、0.5、1、2、4、8 ppb

试剂的准备

 20×洗涤缓冲液的稀释：蒸馏水按1：20稀释，即1份的20×洗涤缓冲液加19份的蒸馏水。

洗板方法

1.   手工洗板：甩尽孔内液体，每孔加满洗涤液，静置1min后甩尽孔内液体，在吸水纸上拍干，如此洗板5次。

2.   自动洗板机：每孔注入洗液350μL，浸泡1min，洗板5次。

操作步骤

1.  从室温平衡20min后的铝箔袋中取出所需板条，剩余板条用自封袋密封放回4℃。

2.  设置标准品孔和样本孔，标准品孔各加不同浓度的标准品50μL；

3.  样本孔先加待测样本10μL，再加样本稀释液40μL；空白孔不加。

4.  除空白孔外，标准品孔和样本孔中每孔加入辣根过氧化物酶（HRP）标记的竞争抗原50μL，用封板膜封住反应孔，37℃水浴锅或恒温箱温育60min。

5.  弃去液体，吸水纸上拍干，每孔加满洗涤液，静置1min，甩去洗涤液，吸水纸上拍干，如此重复洗板5次（也可用洗板机洗板）。

6.  每孔加入底物A、B各50μL，37℃避光孵育15min。

7.  每孔加入终止液50μL，15min内，在450nm波长处测定各孔的OD值。

结果判断

1.  15分钟内在波长450nm的酶标仪上读取各孔的OD值；

2.  百分结合率计算：设S0管计数为B0，各标准管或样品管计数为B，非特异管计数为NSB，则百分结合率计算公式如下：B/B0=(B－NSB)/(B0－NSB)×100%

3.  logit计算:各标准点或样品管的logit值计算公式如下:logit=ln(B/B0)/(1－B/B0)

4.  将标准品的OD均值与标准品0点的OD均相除，为标准点的百分结合率，在log-logit坐标纸上绘图。

5.  Log-logit双对数标准曲线：坐标纸上横轴从左至右第一个1-9表示为第一个10进位，第二个1-9表示为第二个10进位。第三个1-9表示为第三个10进位。坐标纸纵轴为百分比（1-99），即各标准吸光值的百分结合率。取一条通过各点的直线。要求尽可能多的点在线上，同时剩余的点均匀分布在直线的两边。样品也同样由吸光值计算百分结合率，再从纵轴上的相应结合率找到直线上的点，此点对应的横坐标浓度即为样品的浓度，无须换算。

6.  人工处理：以标准浓度取log值为横坐标，对应的logit值为纵坐标在普通坐标纸上或以标准浓度为横坐标，对应的B/B0为纵坐标在logit-log坐标纸上画出标准曲线（理想化时是一条直线）。根据待测样

品的B/B0可以从坐标纸上查出样品的浓度值。如果使用普通坐标纸，查出的数值应取反对数才是最后的浓度值。

7.  自动处理：使用logit-log或四参数数据处理模式，由电脑自动计算得出结果。

8.  敏感度：0.1 ppb

9.  图例

试剂盒性能

1.     准确性：标准品线性回归与预期浓度相关系数R值，大于等于0.9900。

2.     灵敏度：最低检测浓度小于0.1 ppb。

3.     检测范围：0.1 - 8 ppb

4.     特异性：不与其它可溶性结构类似物交叉反应。

5.     重复性：板内、板间变异系数均小于15%。

6.     贮藏：2-8℃，避光防潮保存。

7.     有效期：6个月

免责声明

1.   试剂盒仅供研究使用，不得用于临床实验或人体实验，否则所产生的一切后果，由实验者承担，本公司概不负责。

2.   严格按照说明书操作，实验者违反说明书操作，后果由实验者承担。

FOR RESEARCH USE ONLY.

NOT FOR USE IN DIAGNOSTIC PROCEDURES.

Aflatoxins（Aflatoxin M1）ELISA Kit instruction

Intended use

This Aflatoxin M1 ELISA kit is intended Laboratory for Research use only and is not for use in diagnostic or therapeutic procedures.The Stop Solution changes the color from blue to yellow and the intensity of the color is measured at 450 nm using a spectrophotometer. In order to measure the concentration of Aflatoxin M1 in the sample, this Aflatoxin M1 ELISA Kit includes a set of calibration standards. The calibration standards are assayed at the same time as the samples and allow the operator to produce a standard curve of Optical Density versus Aflatoxin M1 concentration. The concentration of Aflatoxin M1 in the samples is then determined by comparing the O.D. of the samples to the standard curve.

Sample collection and storages

Serum - Use a serum separator tube and allow samples to clot for 30 minutes before centrifugation for 10 minutes at approximately 3000×g. Remove serum and assay immediately or aliquot and store samples at -20℃ or -80℃.Avoid repeated freeze-thaw cycles

Plasma - Collect plasma using EDTA or heparin as an anticoagulant. Centrifuge samples for 30 minutes at 3000×g at 2-8℃ within 30 minutes of collection. Store samples at -20℃or -80℃. Avoid repeated freeze-thaw cycles.

Cell culture supernates and other biological fluids - Remove particulates by centrifugation and assay immediately or aliquot and store samples at -20℃or -80℃. Avoid repeated freeze-thaw cycles.

Note:  The samples shoule be centrifugated dequately and no hemolysis or granule was allowed.

Materials required but not supplied

1.  Standard microplate reader(450nm)

2.  Precision pipettes and Disposable pipette tips.

3.  37 ℃ incubator

Precautions

1.  Do not substitute reagents from one kit to another. Standard, conjugate and microplates are matched for optimal performance. Use only the reagents supplied by manufacturer.

2.  Do not remove microplate from the storage bag until needed. Unused strips should be stored at 2-8°C in their pouch with the desiccant provided.

3.  Mix all reagents before using.

Remove all kit reagents from refrigerator and allow them to reach room temperature ( 20-25°C)

Materials supplied

Note: Standard (S0 → S5) concentration was followed by:0,0.5,1,2,4,8 ppb

Reagent preparation

20×wash solution:Dilute with Distilled or deionized water 1:20.

Assay procedure

1.  Prepare all reagents before starting assay procedure. It is recommended that all Standards and Samples be added in duplicate to the Microelisa Stripplate.

2.  Add standard: Set Standard wells, testing sample wells. Add standard 50μl to standard well.

3.  Add Sample: Add testing sample 10μl then add Sample Diluent 40μl to testing sample well; Blank well doesn’t add anyting.

4.  Add 50μl of HRP-conjugate reagent to each well, cover with an adhesive strip and incubate for 60 minutes at 37°C.

5.  Aspirate each well and wash, repeating the process four times for a total of five washes. Wash by filling each well with Wash Solution (400μl) using a squirt bottle, manifold dispenser or autowasher. Complete removal of liquid at each step is essential to good performance. Aflatoxin M1er the last wash, remove any remaining Wash Solution by aspirating or decanting. Invert the plate and blot it against clean paper towels.

6.  Add chromogen solution A 50μl and chromogen solution B 50μl to each well. Gently mix and incubate for 15 minutes at 37°C. Protect from light.

7.  Add 50μl Stop Solution to each well. The color in the wells should change from blue to yellow. If the color in the wells is green or the color change does not

appear uniform, gently tap the plate to ensure thorough mixing.

8.  Read the Optical Density (O.D.) at 450 nm using a microtiter plate reader within 15 minutes.

Calculation of results

1.  Calculate the mean absorbance value A450 for each set of reference standards and samples.

2.  Divide the average A450 value for each standard, control and test sample by the average A450 of standard0 and multiply by 100 to obtain %B/B0 for each sample.

3.  Prepare a standard curve by plotting the average absorbance of each standard versus the corresponding concentrations of the standards on linear-log graph paper or the %B/B0 value for each standard versus the corresponding concentration of the standard on linear-log or logit-log graph paper. logit=ln(B/ B0)/(1－B/ B0)

4.  Any values obtained for diluted samples must be further converted by applying the appropriate dilution factor in the calculations.

5.  The standard density is a X, the B/ B0 is a Y, sitting to mark the paper in the logit- log up draw a standard curve. According to the B/ B0 that need to be measured the sample can from sit to mark the density value that the paper looks up the sample up.

6.  The sensitivity by this assay is 0.1 ppb

7.  The standard curve presented here is an example of the data typically produced with this kit; however, your results will not be identical to these.

8.  Standard curve match

 Storage：  2-8℃.

validity： six months.

FOR RESEARCH USE ONLY; NOT FOR THERAPEUTIC OR DIAGNOSTIC APPLICATIONS! PLEASE READ THROUGH