上海传秋生物科技有限公司 www.chuanqiubio.com

人的瘦素定量分析酶联免疫检测试剂盒

本试剂盒仅供科研使用。用于体外定量检测人血清、血浆或细胞培养上清液中的 Leptin 浓度。使用前请仔细阅读说明书并检查试剂组

分是否完整。如有产品包装破损或质量投拆，请在收到货一个月之内联系我们。

Leptin简介：

人的瘦素蛋白是一个 16KDa 的多肽激素，主要由脂肪细胞释放，其主要作用是调控食欲的降低和能量消耗。但是，人们还发现瘦素

蛋白在血管再生、骨代谢、造血及免疫调节上有重要的作用。

瘦素可与丘脑下部的中央脊腹部的饱觉中枢结合，从而使得大脑得到食物充足的信号，这样瘦素的表达水平的高低就可达到调控能量

摄入和机体的能量消耗作用。

瘦素功能的实现主要跟瘦素受体结合后实现的，瘦素受体有两类，一类是固定细胞膜上的受体，主要通过 JAK/STAT 信号通路起作用，

另一类是游离的受体，这类受体一般是丢失了受体的细胞膜内的部分，游离出来的，根据失去的结构不同，游离受体的种类较多。人体内

游离的受体的产生主要是由金属蛋白酶介导的细胞膜外功能域的脱落后形成的。游离的受体在晚期肾病、慢性心脏病和厌食症的病人中发

现有所增高。

检测原理:

本试剂盒采用双抗体夹心ELISA法检测样本中Leptin 的浓度。Leptin 捕获抗体已预包被于酶标板上，当加入标本或参考品时，其中

的Leptin 会与捕获抗体结合，其它游离的成分通过洗涤的过程被除去。当加入生物素化的抗人Leptin 抗体后，抗人Leptin 抗体与Leptin

接合，形成夹心的免疫复合物，其它游离的成分通过洗涤的过程被除去。随后加入辣根过氧化物酶标记的亲合素。生物素与亲合素特异性

结合，亲合素连接的酶就会与夹心的免疫复合物连接起来；其它游离的成分通过洗涤的过程被除去。最后加入显色剂，若样本中存在Leptin

将会形成免疫复合物，辣根过氧化物酶会催化无色的显色剂氧化成蓝色物质，在加入终止液后呈黄色。通过酶标仪检测，读其450nm处的OD

值，Leptin 浓度与OD450值之间呈正比，通过参考品绘制标准曲线，对照未知样本中OD值，即可算出标本中Leptin 浓度。

人Leptin定量分析酶联免疫检测试剂盒组成:

组分 规格（96T/48T）

人Leptin预包被板 12条/6条

样本分析缓冲液 5ml/3ml

5×标准品稀释液 10ml/5ml

人Leptin标准品 2/1支(冻干)

人Leptin生物素化抗体 10ml/5ml

亲和素连接的HRP酶 10ml/5ml

浓缩洗涤液 20× 30ml/15ml

TMB底物 10ml/5 ml

中止液 5ml/3 ml

封板胶纸 3/2张

说明书 1份

标本收集:

1.标本的收集请按下列流程进行操作；

A.细胞上清标本离心去除悬浮物后即可；

B.血清标本应是自然凝固后，取上清，避免在冰箱中凝固血液；

C.血浆标本，推荐用EDTA的方法收集；

D.标本收集后请分装，若待测样本不能及时检测，冻存于－20℃，避免反复冻融。

2.血清标本不应添加任何防腐剂或抗凝剂；

3.标本应清澈透明，检测前样本中如有悬浮物应通过离心去除。4.请勿使用溶血高血脂或污染的标本检测，否则结果将不准确。

注：人血清或血浆样本请用标准品稀释液稀释后再检测。

注意事项:

1.试剂盒请保存在2～8℃。

2.浓缩洗涤液因在低温下可能有结晶，请水浴加热使结晶完全溶解后再配制工作液。

3.标准品复溶加样后，剩余部份请丢弃。

4.底物请勿接触氧化剂和金属。

5.加样时，请及时更换枪头，避免交叉污染。

6.严禁混用不同批号的试剂盒组份。

7.充分混匀对保证反应结果的准性很重要，在加液后请轻轻叩击边缘以保证混匀。

8.室温反应，请严格控制在25～28℃。

9.洗涤过程是至关重要的，洗涤不充分会使精确度下降并导致结果误差较大。

10.试验中标准品和样本检测时建议作双复孔。

11.加样过程中避免气泡的产生。

12.血清和血浆标本的检测时，检测抗体的孵育时间应适当延长。

检测前准备工作:

1.试剂盒自冰箱中取出后应置室温（25～28℃）平衡20分钟；每次检测后剩余试剂请及时于2～8℃保存。

2.将浓缩洗涤液用双蒸水或去离子水稀释(1份加19份水)。

3.如有5X准品稀释液，请按所需量用双蒸水或去离子水稀释(1份加4水)。1X

4.标准品: 按标签复溶体积加入 1X 标准品稀释液复溶使 leptin 终浓度达到 2000pg/ml，室温反应，请严格控制在 25～28℃，静置 15~20

分钟后轻轻混悬（建议抽吸几次）待彻底溶解，用标准品稀释液倍比梯度稀释后依次加入检测孔中。（标准曲线取七个点，最高浓度为 2000

pg/ml,标准品稀释液直接加入作为 0 浓度.）

洗涤方法:

自动洗板机或人工洗板：每孔洗涤液为300ul，注入与吸出间隔15-30秒。洗板5次。最后一次洗板完成后将板倒扣着在厚吸水纸上用力拍干。

实验过程需自备的材料：

1.不同规格的加样枪及相应的枪头；

2.酶标仪；

3.自动洗板机；

4.去离子水或双蒸水；

操作步骤:

1.通过计算并确定一次性实验所需的板条数，取出所需板条放置在框架内，暂时用不到板条请放回铝箔袋密封，保存于4℃。

2.建议设置本底较正孔，即空白孔,设置方法为该孔只加TMB显色液和中止液。每次实验均需做标准品对照并画出标准曲线。

3.分别将标本或不同浓度标准品(100ul/孔)加入相应孔中，用封板胶纸封住反应孔，室温（25～28℃）孵育 120 分钟。如果是血清血浆样

本，不同样本稀释比例不一样，一般范围在 5~20 倍，如无明确范围，建议从 10 倍开始，加样稀释说明如下：每孔先加样本分析缓冲液 50ul，

再加用 1×标准品稀释液稀释 5 倍后的样本，加样量为 50ul。

4.洗板5次，且最后一次置厚吸水纸上拍干。

5.加入生物素化抗体工作液(100ul/孔)。用封板胶纸封住反应孔，室温（25～28℃）孵育60分钟。

上海传秋生物科技有限公司 www.chuanqiubio.com人leptin标准曲线

0

0.5

1

1.5

2

2.5

0 62.5 125 250 500 1000 2000

人leptin浓度（pg/ml）

O

D值

上海传秋生物科技有限公司 www.chuanqiubio.com

6.洗板5次，且最后一次置厚吸水纸上拍干。

7.加入亲和素连接的HRP酶工作液(100ul/孔)。用封板胶纸封住反应孔，避光室温（25～28℃）孵育20分钟。

8.洗板5次，且最后一次置厚吸水纸上拍干。

9.加入显色剂TMB100ul/孔，避光室温（25～28℃）孵育20分钟。

10.加入终止液50ul/孔,混匀后即刻测量OD450值。

结果判断:

1.复孔的值在20%的差异范围内结果才有效，复孔的值平均后可作为测量值。

2.每个标准品或标本的OD值应减去本底校正孔的OD值。

3.手工绘制标准曲线。以标准品浓度作横坐标，OD值作纵坐标，以平滑线连接各标准品的坐标点。通过标本的OD值可在标准曲线上查出其

浓度。

4.若标本 OD 值高于标准曲线上限，应适当稀释后重测，计算浓度时应乘以稀释倍数。

典型数值和参考曲线

浓 度

pg/ml

典型OD值1 典型OD值2 OD平均值

0 0.0621 0.1087 0.0854

62.5 0.1488 0.1642 0.1565

125 0.2217 0.2609 0.2413

250 0.3469 0.3983 0.3726

500 0.6494 0.7724 0.7109

1000 1.3671 1.4515 1.4093

2000 1.9359 2.1219 2.0289

人Leptin参考标准曲线

注意：本图仅供参考，应以同次试验标准品所绘标准曲线计算标本含量。

灵敏度，特异性和重复性:

1.灵敏度：多次重复结果表明，最小检出量为6.4pg/ml。

2.特异性：与小鼠Leptin和大鼠Leptin等没有交叉反应。

3.重复性：板内，板间变异系数均<10%.

参考文献:

Myers, M.G., Jr. (2004) Recent Prog. Horm. Res. 59:287.

Sandoval, D.A. and S.N. Davis (2003) J. Diabetes Complications 17:108.

Sierra-Honigmann, M.R. et al. (1998) Science 281:1683.

La Cava, A. and G. Matarese (2004) Nat. Rev. Immunol 4:371.上海传秋生物科技有限公司 www.chuanqiubio.com

ELISA Kit for the Quantitative Analysis of Human Leptin

The human leptin ELISA (enzyme-linked immunosorbent assay) kit is used for detection of human leptin in cell culture

supernatants,human serum and plasma.THE ELISA KIT IS FOR RESEARCH USE ONLY. Please read this instruction manual carefully

and check out the material provided before use, and you can contact with our company if any questions. You can enter our website or call

us for other aim.

Introduction

Leptin, known for its key roles in the regulation of food intake and energy metabolism, is a 16 kDa protein hormone released primarily

by adipose tissues. In addition, leptin has several other important functions involved in angiogenesis, bone metabolism, hematopoiesis,

and immunization.

Leptin binds to the satiety center which lies in the Ventral Medial nucleus of the hypothalamus. Binding of leptin to this nucleus

signals in the brain leads the body to have enough to eat. Thus, circulating leptin levels give the brain a reading of energy storage for the

purposes of regulating appetite and metabolism.Leptin activities are mediated via the leptin receptor including leptin R and OB R. Leptin

R is a member of the type I cytokine receptor family, which can perform function through JAK/STAT signaling pathway. OB R was

truncated cytoplasmic domains with different isoforms. Soluble forms found in humans may be generated post-translationally via

metalloprotease-mediated ectodomain shedding. Soluble Leptin R is also found upregulated in patients with chronic heart failure,

end-stage renal disease, and anorexia.

Principles of the Test

The kits is a solid sandwich enzyme-linked immunosorbent assay for detection of human Leptin. An anti-human Leptin monoclonal

antibody has been absorbed onto the wells of the microtiter strips provided. Samples including specimens or standards were pipetted into

wells. The human Leptin in specimens or standards would be captured by the coated antibody and the free others were removed by

washing. The human Leptin biotin-conjugated antibody were added and binds to human Leptin captured by the first antibody, which

formed a sandwich. Streptavidin-HRP would be added and binds to the biotin conjugated antibody, then free Streptavidin-HRP would be

removed during a wash step. After this, subtrate solution would be added and catalyzed by the HRP, and a coloured product is formed.

The intensity of the colored product is used to calculate in proportion to the amount of human Leptin in the original specimen.

Materials provided with the kits:

reagent 96/48Test Kit

Human Leptin Antibody-Coated Wells 12 strips/6 strips

Assay Buffer 5ml/3ml

5×Standard Diluent 10ml/5ml

Human Leptin Standard 2/1vial(s)

Human Leptin Detetion Antibody 10ml/5ml

Streptavidin-HRP 10ml/5ml

Wash Buffer Concentrate 20× 30ml/15ml

TMB 10ml/5ml

Stop Solution 5ml/3ml

Plate Covers 3/2

Complete Instruction Manual 1

Specimen Collection

1.Collecting specimen as following:

A.The particulate of the cell culture supernatants should be removed before use.

B.Serum was obtained from clot at room temperature.C.Please collect plasma with EDTA.

D.Assay immediately or store samples at －20℃. Avoid free-thaw cycles.

2 . Antiseptic and anticoagulant should not appear in Serum samples.

3.Any particulate should be removed from samples before use.

4. Do not use grossly hemolyzed or lipemic samples.

Note: Strongly recommend that the serum and plasma samples should be diluent as doubling dilution before use.

Precautions for use:

1.Please storage the Kit at 2～8℃。

2. Washing buffer concentrate may have crystal in low temperature, and you can melt its in water-bath before use.

3. Please discard the remains after use of the dissolved standard.

4.Avoid contact of substrate solution with oxidizing agents and metal.

5.Usage of disposable pipette tips avoid microbial contamination or cross-contamination of reagents or specimens.

6. Do not mix or substitute reagents with those from other lots or other sources.

7. To ensure the adequate mixure of added reagents, please tap gently the plate after the wells were filled with liquid.

8. Incubation temperature should be 25～28℃.

9. Wash step was crucial for whole assay process.

10. Duplicate wells of the same sample were recommended in assay process.

11. Avoid the foam while pour the liquid into wells.

12.For serum or plasma samples ,the biotin-conjugated antibody should be incubate for at least 90 minutes.

Reagent Preparation

1.The reagents should be warmed up to room temperature before use. The remanent reagents must reseal and put into refrigeratory

again as soon as possible.

2.Dilute 1ml of wash buffer Concentrate into 19ml deionized or distilled water to work.

3. Dilute 1ml of 5×sample diluent into 4ml deionized or distilled water to 1×sample diluent.

4. Add the standard dilution solution to the bottle according to the volume of the label and wait15 minutes for complete dissolution.

Incubation temperature should be25-28℃。.And in turn add the half concentration diluent by standard diluent .

Wash step:

Automated microplate washer or operating by pipette: Each well should be pour into 300ul wash buffer and soak 15 or 30 seconds,then

be aspirated, five times process were repeated. After the last wash, remove remaining wash buffer by aspirating.Invert the plate and blot

it against clean paper towels.

Materials Required But Not Provided

1. pipettes and pipette tips

2. Microwell strip reader capable of reading at 450 nm (540 nm as optional reference wave length)

3. automated microplate washer

4.Glass-distilled or deionized water

Assay procedure

1.The needed strips were putted into the frame, the remains were returned into foil pouch and resealed.

2.Blank well were recommended, which only color reagent and stop solution be added. It is suggested that each testing with gradient

density of standard for standard curve.

3.Add 100ul of standard or sample.Cover with the Plate Covers provided.Incubate for 2 hours at room temperature If the serum levels of

plasma samples, different sample dilution ratio is different, generally range in 5 ~ 20 times, if there is no definite scope, advice from 10

times, add sample dilution shows as follows: Each hole add buffer 50 ul sample analysis, add in 1 x standard sample after 5 times diluent

dilution, and sample amount to 50 ul.

4.Five times wash process were repeated.

5.Add 100ul of detetion antibody. Cover with the Plate Covers provided.Incubate for 1 hour at room temperature.

6.Five times wash process were repeated.

7.Add 100ul of Streptavidin-HRP. Cover with the Plate Covers provided. Lucifugal incubation for 20 minutes at room temperature.

8.Five times wash process were repeated.

9.Add 100ul of TMB，Lucifugal incubation for 20 minutes at room temperature.

10.Add 50ul of stop solution to each well, determine the optical density of each well within 10 minutes.

Calculation of Results

1.Duplicates should be within 20 per cent of the mean. Average absorbance values for each set of duplicate samples were used as

detection results.

2.The blank absorbance values of subtract should be deducted.

3.Drawing a best fit curve through the points of graph. Draw the standard curve by plotting assayed OD valure (on the Y axis) vs.

concentration (on the X axis). The sample concentration was obtained based on its OD value founding in the standard concentration

curve.

4.If the values obtained are not within the expected range of the standard, Samples should be dilute and assay again.

Typical Data and Standard Curve

concentration

(pg/ml)

Typical data 1 Typical data2 Average

0 0.0621 0.1087 0.0854

62.5 0.1488 0.1642 0.1565

125 0.2217 0.2609 0.2413

250 0.3469 0.3983 0.3726

500 0.6494 0.7724 0.7109

1000 1.3671 1.4515 1.4093

2000 1.9359 2.1219 2.0289

Human Leptin Standard Curve

Sensitivity, Specificity, Repeatability

Sensitivity: repeated assays were evaluated and the minimum detectable dose was 6.4pg/ml.

Specificity : No significant cross-reactivity or interference with Mouse Leptin and Rat Leptin.

Repeatability: The coefficient of variation between wells or plates is less than 10 percent.

REFERENCES:

Myers, M.G., Jr. (2004) Recent Prog. Horm. Res. 59:287.

Sandoval, D.A. and S.N. Davis (2003) J. Diabetes Complications 17:108.

Sierra-Honigmann, M.R. et al. (1998) Science 281:1683.

La Cava, A. and G. Matarese (2004) Nat. Rev. Immunol 4:371.