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Human Alpha-2-Microglobulin Like Protein 1 (a2ML1) ELISA Kit
two product lines: Traditional ELISA Kit and Ready-to-Use ELISA Kit.
| Traditional ELISA Kit | Ready-to-Use ELISA KIT | |
| Product name: | Human Alpha-2-Microglobulin Like Protein 1 (a2ML1) ELISA Kit | |
| Method: | Sandwich | |
| Synonyms: | CPAMD9; C3 And PZP-Like,Alpha-2-Macroglobulin Domain Containing 9 |
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| Detection range: | 0.156-10ng/mL | |
| Target Protein: | a2ML1 | |
| Size: | 96T/48T | |
| Quality guarantee period: | for 12 months, 16 months | |
| Catalog number: | DL-a2ML1-Hu (traditional) | (ready-to-use) |
| Assay length | 1-4.5Hours | 1-3.5Hours |
| Advantages: |
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| Instruction Manual |
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Other names：CPAMD9; C3 And PZP-Like,Alpha-2-Macroglobulin Domain Containing 9
Function: Is able to inhibit all four classes of proteinases by a unique 'trapping' mechanism. This protein has a peptide stretch, called the 'bait region' which contains specific cleavage sites for different proteinases. When a proteinase cleaves the bait region, a conformational change is induced in the protein which traps the proteinase. The entrapped enzyme remains active against low molecular weight substrates (activity against high molecular weight substrates is greatly reduced). Following cleavage in the bait region a thioester bond is hydrolyzed and mediates the covalent binding of the protein to the proteinase (By similarity). Displays inhibitory activity against chymotrypsin, papain, thermolysin, subtilisin A and, to a lesser extent, elastase but not trypsin. May play an important role during desquamation by inhibiting extracellular proteases.
Sequence：
MWAQLLLGML ALSPAIAEEL PNYLVTLPAR LNFPSVQKVC LDLSPGYSDV
KFTVTLETKD KTQKLLEYSG LKKRHLHCIS FLVPPPAGGT EEVATIRVSG
VGNNISFEEK KKVLIQRQGN GTFVQTDKPL YTPGQQVYFR IVTMDSNFVP
VNDKYSMVEL QDPNSNRIAQ WLEVVPEQGI VDLSFQLAPE AMLGTYTVAV
AEGKTFGTFS VEEYVLPKFK VEVVEPKELS TVQESFLVKI CCRYTYGKPM
LGAVQVSVCQ KANTYWYREV EREQLPDKCR NLSGQTDKTG CFSAPVDMAT
FDLIGYAYSH QINIVATVVE EGTGVEANAT QNIYISPQMG SMTFEDTSNF
YHPNFPFSGK IRVRGHDDSF LKNHLVFLVI YGTNGTFNQT LVTDNNGLAP
FTLETSGWNG TDVSLEGKFQ MEDLVYNPEQ VPRYYQNAYL HLRPFYSTTR
SFLGIHRLNG PLKCGQPQEV LVDYYIDPAD ASPDQEISFS YYLIGKGSLV
MEGQKHLNSK KKGLKASFSL SLTFTSRLAP DPSLVIYAIF PSGGVVADKI
QFSVEMCFDN QVSLGFSPSQ QLPGAEVELQ LQAAPGSLCA LRAVDESVLL
LRPDRELSNR SVYGMFPFWY GHYPYQVAEY DQCPVSGPWD FPQPLIDPMP
QGHSSQRSII WRPSFSEGTD LFSFFRDVGL KILSNAKIKK PVDCSHRSPE
YSTAMGAGGG HPEAFESSTP LHQAEDSQVR QYFPETWLWD LFPIGNSGKE
AVHVTVPDAI TEWKAMSFCT SQSRGFGLSP TVGLTAFKPF FVDLTLPYSV
VRGESFRLTA TIFNYLKDCI RVQTDLAKSH EYQLESWADS QTSSCLCADD
AKTHHWNITA VKLGHINFTI STKILDSNEP CGGQKGFVPQ KGRSDTLIKP
VLVKPEGVLV EKTHSSLLCP KGKVASESVS LELPVDIVPD STKAYVTVLG
DIMGTALQNL DGLVQMPSGC GEQNMVLFAP IIYVLQYLEK AGLLTEEIRS
RAVGFLEIGY QKELMYKHSN GSYSAFGERD GNGNTWLTAF VTKCFGQAQK
FIFIDPKNIQ DALKWMAGNQ LPSGCYANVG NLLHTAMKGG VDDEVSLTAY
VTAALLEMGK DVDDPMVSQG LRCLKNSATS TTNLYTQALL AYIFSLAGEM
DIRNILLKQL DQQAIISGES IYWSQKPTPS SNASPWSEPA AVDVELTAYA
LLAQLTKPSL TQKEIAKATS IVAWLAKQHN AYGGFSSTQD TVVALQALAK
YATTAYMPSE EINLVVKSTE NFQRTFNIQS VNRLVFQQDT LPNVPGMYTL
EASGQGCVYV QTVLRYNILP PTNMKTFSLS VEIGKARCEQ PTSPRSLTLT
IHTSYVGSRS SSNMAIVEVK MLSGFSPMEG TNQLLLQQPL VKKVEFGTDT
LNIYLDELIK NTQTYTFTIS QSVLVTNLKP ATIKVYDYYL PDEQATIQYS
DPCE
2. Features
INTENDED USE
The kit is a sandwich enzyme immunoassay for the in vitro quantitative measurement of a2ML1 in human serum, plasma, tissue homogenates and other biological fluids.
DETECTION RANGE
0.156-10ng/mL. The standard curve concentrations used for the ELISA’s were 10ng/mL, 5ng/mL, 2.5ng/mL, 1.25ng/mL, 0.625ng/mL, 0.312ng/mL, 0.156ng/mL.
SENSITIVITY
The minimum detectable dose of a2ML1 is typically less than 0.067ng/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. It was determined by adding two standard deviations to the mean optical density value of twenty zero standard replicates and calculating the corresponding concentration.
SPECIFICITY
This assay has high sensitivity and excellent specificity for detection of a2ML1.
No significant cross-reactivity or interference between a2ML1 and analogues was observed.
Note: Limited by current skills and knowledge, it is impossible to perform all possible cross-reactivity detection tests between a2ML1 and all analogues, therefore, cross reactivity may still exist.
IMPORTANT NOTES
1. Limited by the current conditions and scientific technology, it is impossible to conduct comprehensive identification and analysis tests on the raw materials provided by suppliers. As a result, it is possible there are some qualitative and/or technical risks.
2. The final experimental results will be closely related to the validity of the products, operation skills of the end users and the experimental environments. Please make sure that sufficient samples are available to obtain accurate results.
3. Kits from different batches may be a little different in detection range, sensitivity and color developing time. Please perform the experiment exactly according to the instruction manual included in your kit. Electronic ones on our website are for reference only.
4. Do not mix or substitute reagents from one kit lot to another. Use only the reagents supplied by manufacturer.
5. Protect all reagents from strong light during storage and incubation. All bottle caps of reagents should be closed tightly to prevent evaporation of liquids and contamination by microorganisms.
6. There may be a foggy substance in the wells when the plate is opened at the first time. It will not have any effect on the final assay results. Do not remove microtiter plate from the storage bag until needed.
7. Incorrect procedures during reagent preparation and loading, as well as incorrect parameter setting for the plate reader may lead to incorrect results. A microplate plate reader with a bandwidth of 10nm or less and an optical density range of 0-3 O.D. or greater at 450 ± 10nm wavelength is acceptable for use in absorbance measurement. Please read the instruction carefully and adjust the instrument prior to the experiment.
8. Even the same experimenter may get different results from two separate experiments. In order to get better reproducible results, the operation of every step in the assay should be controlled. Furthermore, a preliminary experiment before the general assay for each batch is recommended.
9. Each kit has undergone several rigorous quality control tests. However, results from end users might be inconsistent with our in-house data due to some unexpected transportation conditions or different lab equipment. Intra-assay variance among kits from different batches could arise from the above factors as well.
10. Kits from different manufacturers with the same item might produce different results, since we have not compared our products with other manufacturers.
11. The standard of the kit and immunogen used for antibody preparation are commonly recombinant proteins. Different expressed sequence, expression systems, purification methods might be used in recombinant protein preparation. Besides, there might exist differences on the screening technique of antibody and antibody pairs in our kit. Thus we can not guarantee the kit could detect recombinant protein from other companies. So, it is not recommended to use the kit for the detection of recombinant protein.
12. Validity period: 12 months.
13. The instruction manual also works with the 48T kit, but all reagents in the 48T kit are reduced by half.
PRECAUTION
The Stop Solution suggested for use with this kit is an acid solution. Wear eye, hand, face, and clothing protection when using this reagent.
You can reference link of the kit as following
https://www.dldevelop.com/uploadfile/data/DL-a2ML1-Hu.pdf
Introduction
| Item | Standard | Test | |
| Description |
The kit is a sandwich enzyme immunoassay for the in vitro quantitative measurement of a2ML1 in human serum, plasma, tissue homogenates and other biological fluids. |
Conform | |
| Identification | Colorimetric | Positive | |
| Composition | Traditional ELISA Kit | Ready-to-Use ELISA KIT | Conform |
| Pre-coated, ready to use 96-well strip plate 1 | Pre-coated, ready to use 96-well strip plate 1 | ||
| Plate sealer for 96 wells 2 | Plate sealer for 96 wells 2 | ||
| Standard 2 | Standard 2 | ||
| Diluents buffer 1×45mL | Standard Diluent 1×20mL | ||
| Detection Reagent A 1×120μL | Detection Solution A 1×12mL | ||
| Detection Reagent B 1×120μL | Detection Solution B 1×12mL | ||
| TMB Substrate 1×9mL | TMB Substrate 1×9mL | ||
| Stop Solution 1×6mL | Stop Solution 1×6mL | ||
| Wash Buffer (30 × concentrate) 1×20mL | Wash Buffer (30 × concentrate) 1×20mL | ||
| Instruction manual 1 | Instruction manual 1 | ||
Test principle
The microtiter plate provided in this kit has been pre-coated with an antibody specific to the index. Standards or samples are then added to the appropriate microtiter plate wells with a biotin-conjugated antibody preparation specific to the index. Next, Avidin conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. After TMB substrate solution is added, only those wells that contain the index, biotin-conjugated antibody and enzyme-conjugated Avidin will exhibit a change in color. The enzyme-substrate reaction is terminated by the addition of sulphuric acid solution and the color change is measured spectrophotometrically at a wavelength of 450nm ± 10nm. The concentration of the index in the samples is then determined by comparing the O.D. of the samples to the standard curve.
Recovery
Matrices listed below were spiked with certain level of recombinant a2ML1 and the recovery rates were calculated by comparing the measured value to the expected amount of the index in samples.
| Matrix | Recovery range (%) | Average(%) |
| serum(n=5) | 81-93 | 86 |
| EDTA plasma(n=5) | 80-97 | 88 |
| heparin plasma(n=5) | 90-101 | 95 |
Linearity
The linearity of the kit was assayed by testing samples spiked with appropriate concentration of the index and their serial dilutions. The results were demonstrated by the percentage of calculated concentration to the expected.
| Sample | 1：2 | 1：4 | 1：8 | 1：16 |
| serum(n=5) | 82-96% | 83-98% | 81-99% | 93-101% |
| EDTA plasma(n=5) | 88-101% | 86-95% | 90-102% | 80-93% |
| heparin plasma(n=5) | 80-91% | 82-90% | 95-104% | 79-95% |
Precision
Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level the index were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level the index were tested on 3 different plates, 8 replicates in each plate.
CV(%) = SD/meanX100
Intra-Assay: CV<10%
Inter-Assay: CV<12%
Stability
The stability of ELISA kit is determined by the loss rate of activity. The loss rate of this kit is less than 5% within the expiration date under appropriate storage conditions.
Note:
To minimize unnecessary influences on the performance, operation procedures and lab conditions, especially room temperature, air humidity and incubator temperatures should be strictly regulated. It is also strongly suggested that the whole assay is performed by the same experimenter from the beginning to the end.
Assay procedure summary
1. Prepare all reagents, samples and standards;
2. Add 100µL standard or sample to each well. Incubate 2 hours at 37℃;
3. Aspirate and add 100µL prepared Detection Reagent A. Incubate 1 hour at 37℃;
4. Aspirate and wash 3 times;
5. Add 100µL prepared Detection Reagent B. Incubate 1 hour at 37℃;
6. Aspirate and wash 5 times;
7. Add 90µL Substrate Solution. Incubate 15-25 minutes at 37℃;
8. Add 50µL Stop Solution. Read at 450nm immediately.
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