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ANGPTL3 (human) Serum ELISA Kit

Catalog #: K4914

In stock


Product Details

Cat # +Size K4914-100
Size 100 assays
Detection Method Absorbance (450 nm)
Species Reactivity Mammalian
Applications This ELISA kit is used for this assay detects human ANGPTL3 in the range of 0.156–10 ng/ml ANGPTL3/ml. The lowest level of ANGPTL3 that can be detected by this assay is 75 pg/ml.
Features & Benefits • Simple procedure
• Fast and convenient
• High-throughput adaptable
• Cross Reactivity: No significant cross-reactivity or interference between this analyte and its analogues was observed.
Kit Components • 1 plate coated with human ANGPTL3 Antibody
• 1 bottle Wash Buffer 10X
• 1 bottle Diluent 5X
• 1 bottle Detection Antibody
• 1 vial Detector 100X (HRP Labeled Streptavidin)
• 1 vial human ANGPTL3 Standard (lyophilized)
• 1 vial human ANGPTL3 QC sample (lyophilized)
• 1 bottle TMB Substrate Solution
• 1 bottle Stop Solution
• 3 plate sealers (plastic film)
Storage Conditions 4°C
Shipping Conditions Gel Pack
USAGE For Research Use Only! Not For Use in Humans.


The angiopoietins are a family of growth factors that are specific for vascular endothelium. The full-length cDNA encoding angiopoietin-like protein 3 (ANGPTL3) from a human fetal liver/spleen cDNA library has 460-amino acid and the characteristic structure of angiopoietins: a signal peptide, an extended helical domain predicted to form dimeric or trimeric coiled-coils, a short linker peptide, and a globular fibrinogen-like domain (FLD). Human ANGPTL3 shares 76% amino acid sequence identity with mouse Angptl3. Northern blot analysis of human tissues showed a preferential expression of 4 ANGPTL3 transcripts being 4.5, 3.0, 2.8, and 1.7 kb in liver. ANGPTL3 can induce angiogenesis in the rat corneal assay. The FLD alone was sufficient to induce endothelial cell adhesion and in vivo angiogenesis. Microarray analysis showed that mouse hematopoietic stem cell (HSC)-supportive fetal liver CD3-positive cells expressed Angptl2 and Angptl3. The ANGPTL3 ELISA Kit is to be used for the in vitro quantitative determination of human ANGPTL3 in biological fluids. This assay is a sandwich Enzyme Linked-Immunosorbent Assay (ELISA) for quantitative determination of human ANGPTL3 in biological fluids. A monoclonal antibody specific for ANGPTL3 has been precoated onto the 96-well microtiter plate. Standards and samples are pipetted into the wells for binding to the coated antibody. After extensive washing to remove unbound compounds, ANGPTL3 is recognized by the addition of a purified polyclonal antibody specific for ANGPTL3 (Detection Antibody). After removal of excess polyclonal antibody, HRP conjugated anti-rabbit IgG (Detector) is added. Following a final washing, peroxidase activity is quantified using the substrate 3,3’,5,5’-tetramethylbenzidine (TMB). The intensity of the color reaction is measured at 450 nm after acidification and is directly proportional to the concentration of ANGPTL3 in the samples.

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What is a sandwich ELISA?
The analyte of interest in a sample is "sandwiched" by an immobilized capture antibody coated on the plate and a labeled antibody used for detection. Sandwich ELISA is very sensitive. The density of color is proportional to the amount of analyte captured from the samples and can be quantified when compared with standard curve.
What is a competitive ELISA?
The endogenous unlabled analyte of interest in a sample is "competed" by the exogenous labeled antigen coated on the plate for a limited amount of antibody binding sites. Therefore, the lower signal indicate higher concentration of the analyte.
What dilution range should I use for the samples?
A preliminary experiment is always recommended when working with new samples and ELISA Kits to ensure all results fall within the detection range.
Can I extend the standard curve (in either direction)?
Extended standard curve is not recommended by BioVision.
What type of software is needed to graph a 4-parameter or 5-parameter curve?
SoftMax Pro by Molecular Devices, SigmaPlot® by Systat Software Inc., or others can be used for this purpose.
Low absorbance; No signal
Target present below detection limits of assay
Reduce dilution factor to increase sample concentration  (Preliminary experiment is recommended for optimal dilution range)
Incompatible sample types
Use samples recommended by the kit
Standard dilutions are unstable
Use fresh standard dilutions
Buffers/substrates are contaminated
Use new buffers and substrates
Insufficient incubation time 
Extend incubation time
Cover or seal plates during all incubation 
Plate washings too vigorous
Pipette wash buffer gently or make sure the automatic wash system has correct pressure
Wells scratched with pipette or washing tips
Use caution when dispensing and aspirating into and out of wells
Incubation temperature too low
Ensure incubations are carried out at temperatures recommended by the manual
Reagents are cold
Bring all reagents to room temperature before each assay
Plate read at incorrect wavelength

Ensure the plate reader is set at the correct wavelength recommended on the protocol

High Background
Insufficient washing
Increase number of washes; Add a 30 second soaking step in between washes;  at the end of each washing step, invert plate on absorbent tissue to completely drain all wells
Residual buffer/substrates remain in wells
Remove all residual buffer and substrates at the end of each wash
Too much HRP-Streptavidin
Centrifuge and mix the substrate vial before use to avoid percipitation and inconsistent HRP concentration
Excessive incubation time
Reduce incubation time
Substrate incubation carry out in light or wait too long to read plate after adding stop solution
Avoid light during incubation and read signals immediately after adding stop solution
Standards improperly reconstituted or diluted
Briefly spin vials before opening; inspect for undissolved material after reconstitution
Poor standard curve
Standard improperly diluted
Confirm dilutions are made correctly
Standard dilutions are unstable
Use freshly diluted standards
Pipetting error 
use calibrated pipette and stay consistent between each pipette
Curve doesn't fit scale
Try plotting using different scales  (log-log, 4 parameter logistic, 5 parameter etc.)
Large intra-coefficient of variation (CV)
Bubbles in wells
Avoid bubbles during experiment, eliminate all bubbles prior to reading
Insufficient washing
Increase number of washes; add a 30 second soak step in between washes;  at the end of each washing step, invert plate on absorbent tissue to completely drain all wells
Wells not washed equally/thoroughly
Use calibrated (automated) multi-channel pipette for consistent handling, make sure all parts of the automated washer are unobstructed
Edge effects
Seal the plate completely during incubation
Incomplete reagent mixing
Make sure all reagents are mixed thoroughly during each step
Inconsistent sample preparation or storage
Consistent sample preparation. Optimize sample storage conditions and minimize freeze and thaw cycles
Stacked plates
Avoid stacking plates during incubation
Plate sealers not used or reused
Cover assay plate with plate sealer, use a fresh sealer each time to prevent contamination
Large inter-coefficient of variation (CV))
Insufficient washing
Increase number of washes; add a 30 second soak step in between washes;  at the end of each washing step, invert plate on absorbent tissue to completely drain all wells
Inconsistent incubation temperature
Make sure to follow recommended incubation temperatures. Avoid fluctuations in temperature due to environmental conditions.
Plate sealers not used or reused
Cover assay plate with plate sealer, use a fresh sealer each time to prevent contamination