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閱讀:237發布時間:2013-4-19
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Human Brain Derived Neurotrophic
Facor(BDNF) ELISA Kit
Catalog No. CSB-E04501h
(96 tests)
This immunoassay kit allows for the in vitro quantitative determination of human
BDNF 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
BDNF is a 13 kDa, 119 amino acid (aa) residue non-glycosylated
polypeptide whose primary structure is conserved among all mammalian
species examined. Initially synthesized as a 247 aa residue prepropeptide,
the BDNF molecule is divided into an 18 aa residue signal sequence, a 110
aa residue prosequence, and a 119 aa residue mature segment. Similar to
other neurotrophic factors, there is a possibility that the N-terminus is
alternatively spliced, giving rise to a longer pre-prosegment (but identical
mature segment) with different functional properties. As a mature molecule,
BDNF is 52% identical to NGF at the amino acid level, exists as a
noncovalently-linked homodimer in solution, and contains six cysteine
residues that are believed to form three intrachain disulfide linkages. BDNF
in plasma is detected in the pg/mL
PRINCIPLE OF THE ASSAY
The microtiter plate provided in this kit has been pre-coated with an
antibody specific to BDNF. Standards or samples are then added to the
appropriate microtiter plate wells with a Horseradish Peroxidase (HRP)
-conjugated antibody preparation specific for BDNF and incubated. Then
substrate solutions are added to each well. 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 BDNF in the samples is then determined by
comparing the O.D. of the samples to the standard curve.
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DETECTION RANGE
0.62 ng/ml-20 ng/ml. The standard curve concentrations used for the
ELISA’s were 20 ng/ml, 10 ng/ml, 4.37 ng/ml,1.87 ng/ml, 0.62ng/ml.
SPECIFICITY
This assay recognizes human BDNF. No significant cross-reactivity or
interference was observed.
SENSITIVITY
The minimum detectable dose of human BDNF is typically less than 0.31
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.
MATERIALS PROVIDED
Reagent Quantity
Assay plate 1
Standard 5 x 0.5 ml
HRP-conjugate 1 x 6 ml
Substrate A 1 x 7 ml
Substrate B 1 x 7 ml
Stop Solution 1 x 7 ml
Standard S1 S2 S3 S4 S5
Concentration
(ng/ml)
0.62 1.87 4.37 10 20
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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. The test kit may be used
throughout the expiration date of the kit. Refer to the package label for
the expiration date.
2. Opened test kits will remain stable until the expiring date shown,
provided it is stored as prescribed above.
3. 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.
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.
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.
1. Set a Blank well without any solution. Add 50µl of Standard or Sample
per well.
2. Add 50µl of HRP-Conjugate to each well (Not to Blank!). Incubate for 1
hour at 37°C.
3. Aspirate each well and wash, repeating the process three times for a
total of three washes. Wash by filling each well with ddH2O (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.
4. Add 50µl of Substrate A and 50µl Substrate B to each well. Incubate
for 15 minutes at 37°C. Keeping the plate away from drafts and other
temperature fluctuations in the dark.
5. Add 50µl of Stop Solution to each well. If color change does not
appear uniform, gently tap the plate to ensure thorough mixing.
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6. Determine the optical density of each well within 30 minutes, using a
microplate reader set to 450 nm.
CALCULATION OF RESULTS
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
BDNF 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.
If samples generate values higher than the highest standard, dilute the
samples and repeat the assay.
Any variation in operator, pipetting technique, washing technique,
incubation time or temperature, and kit age can cause variation in
binding.
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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 Quantikine Immunoassay, the
possibility of interference cannot be excluded.
TECHNICAL HINTS
When mixing or reconstituting protein solutions, always avoid foaming.
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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人腦源性神經營養因子 人腦源性神經營養因子 人腦源性神經營養因子 人腦源性神經營養因子(BDNF)快速檢測試劑盒 快速檢測試劑盒 快速檢測試劑盒 快速檢測試劑盒
使用說明書 使用說明書 使用說明書 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
產品編號 產品編號 產品編號 產品編號:CSB-E04501h
檢測范圍 檢測范圍 檢測范圍 檢測范圍: :: :0.62 ng /ml -20 ng /ml
zui低檢測限 zui低檢測限 zui低檢測限 zui低檢測限: :: :0.31 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 BDNF,且與其他相關蛋白基
本無交叉反應。
有效期 有效期 有效期 有效期:6 個月(2-8℃避光保存)
預期應用 預期應用 預期應用 預期應用: :: :ELISA法定量測定人血清,血漿及其它相關生物液體中 BDNF
含量。
說明 說明 說明 說明
1. 濃洗滌液低溫保存會有鹽析出,稀釋時可在水浴中加溫助溶。
2. 剛開啟的酶聯板孔中可能會含有少許水樣物質,此為正常現象,不會對實
驗結果造成任何影響。
實驗原理 實驗原理 實驗原理 實驗原理
本試劑盒采用雙抗體夾心法檢測 BDNF含量。首先用 BDNF抗體包被微
孔板,制備成固相載體,然后加入樣品(標準品與待測標本)同時加入酶標
記的 BDNF 抗體,特異性地形成固相抗體-抗原-酶標記抗體復合物,加底物
顯色后在酶標儀測定吸光值(OD值),根據標準曲線計算出樣品的含量。
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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. 酶聯板 酶聯板 酶聯板 酶聯板(Assay plate ): 一塊 (96孔)。
2. 標準品 標準品 標準品 標準品 (Standard): 5×0.5ml/瓶。
Standard 1 Standard 2 Standard 3 Standard 4 Standard 5
0.62ng/ml 1.87ng/ml 4.37ng/ml 10ng/ml 20ng/ml
3. 酶結合物 酶結合物 酶結合物 酶結合物( (( (HRP-conjugate) )) ): 1×6ml/瓶。
4. 顯色劑 顯色劑 顯色劑 顯色劑 A ( (( (Substrate A): ): ): ): 1×7ml/瓶。
5. 顯色劑 顯色劑 顯色劑 顯色劑 B ( (( (Substrate B): ): ): ): 1×7ml/瓶。
6. 終止液 終止液 終止液 終止液( (( (Stop Solution) )) ): 1×7ml/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. 標準規格酶標儀
2. 高速離心機
3. 電熱恒溫培養箱
4. 干凈的試管和 Eppendof 管
5. 系列可調節移液器及吸頭,一次檢測樣品較多時,用多通道移液器
6. 蒸餾水,容量瓶等
標本的采集及保存 標本的采集及保存 標本的采集及保存 標本的采集及保存
1. 血清:全血標本請于室溫放置 2 小時或 4℃過夜后于 1000 x g離心 20 分
鐘,取上清即可檢測,或將標本放于-20℃或-80℃保存,但應避免反復凍
融。
2. 血漿:可用 EDTA 或肝素作為抗凝劑,標本采集后 30 分鐘內于 2 - 8° C
1000 x g離心 15 分鐘,或將標本放于-20℃或-80℃保存,但應避免反復
凍融。
注 注注 注: :: :以上標本置 以上標本置 以上標本置 以上標本置 4℃ ℃℃ ℃保存應小于 保存應小于 保存應小于 保存應小于 1 周 周周 周, ,, ,-20℃ ℃℃ ℃或 或或 或-80℃ ℃℃ ℃均應密封保存 均應密封保存 均應密封保存 均應密封保存, ,, ,-20℃ ℃℃ ℃不應超過 不應超過 不應超過 不應超過 1 個 個個 個
月 月月 月, ,, ,-80℃ ℃℃ ℃不應超過 不應超過 不應超過 不應超過 2 個月 個月 個月 個月; ;; ;標本溶血會影響zui后檢測結 標本溶血會影響zui后檢測結 標本溶血會影響zui后檢測結 標本溶血會影響zui后檢測結果 果果 果, ,, ,因此溶血標本不宜進行檢 因此溶血標本不宜進行檢 因此溶血標本不宜進行檢 因此溶血標本不宜進行檢
測 測測 測。 。。 。
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操作步驟 操作步驟 操作步驟 操作步驟
1. 將各種試劑至室溫〔18-25℃〕平衡半小時。
2. 將酶標板取出,設一個空白對照孔、不加任何液體;每個標準點依次各設
兩孔,每孔加入相應標準品 50ul;其余每個檢測孔直接加待測標本 50ul。
3. 每孔加入酶結合物 50ul(空白對照孔除外),充分混勻,貼上不干膠封片,
置 37℃溫育 1 小時。
4. 手工洗板,棄去孔內液體。去離子水注滿各孔,靜置 10 秒甩干,重復三
次后拍干;洗板機洗板,選擇洗滌三次程序,洗板后拍干。
5. 每孔加顯色劑 A 液 50µl,顯色劑 B 液 50µl,振蕩混勻后,37℃避光顯色
15 分鐘,每孔加終止液 50µl。
6. 用酶標儀讀數,取波長 450nm,先用空白孔調零點,然后測定各孔 OD
值。
數據處理 數據處理 數據處理 數據處理
1. 手工作圖:用雙對數坐標紙,以標準品濃度為橫軸,以對應的 0D值為縱
軸,畫出平滑曲線或直線,在曲線上按照待測血清 OD值找到對應的濃度
值。
2. 計算機:使用線性擬合功能,應將標準品 S1-S5 的濃度取對數(Log(濃
度))作為 X,將對應的 OD值減去空白對照孔 OD值后取對數(Log(OD
值-NSB))作為 Y,進行線性擬合。再從擬合線上計算出待測血清濃度。
注意事項 注意事項 注意事項 注意事項
1. 從冷藏環境中取出的試劑盒內全部瓶裝試劑及所需預包被板條應置室溫
(18-25℃)平衡 30 分鐘后方可使用,余者應及時封好口,放回 2-8℃中避
光保存,以備后用。
2. 使用前試劑應搖勻。
3. 結果判斷須在反應終止后 10 分鐘內完成。
4. 不同批號的試劑不可混用。
5. 加樣時應注意避免所用各試劑及樣品之間的交又污染。
6. 操作時,試劑盒內每種試劑各使用一個吸頭,每一種標準品使用一個吸頭,
每一個樣品各使用一個吸頭,吸頭一次性使用。
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