Human LCN1 / Lipocalin 1 ELISA Pair Set

Details for Product No. ABIN2010441, Supplier: Log in to see
  • PMFA
  • TLC
  • TP
  • VEGP
  • VEG
  • lipocalin 1
  • von Ebner gland protein 2-like
  • LCN1
  • LOC100725936
Method Type
Sandwich ELISA
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Purpose The human LCN1 / Lipocalin 1 ELISA Pair Set is for the quantitative determinationof human LCN1 / Lipocalin 1.
This ELISA Pair Set contains the basic components required for the development of sandwich ELISAs.
Detection Method Colorimetric
Sensitivity 31.25 pg/mL
Characteristics Capture Antibody: 0.15 mg/mL of mouse anti-LCN1 monoclonal antibody. Dilute to a working concentration of 2.0 μg/mL in CBS before coating.

Detection Antibody: 0.25 mg/mL mouse anti-LCN1 monoclonal antibody conjugated to horseradish-peroxidase (HRP). Dilute to working concentration of 0.5 μg/mL in detection antibody dilution buffer before use.

Standard: Each vial contains 35 ng of recombinant LCN1. Reconstitute standard powder with 1 mL detection antibody dilution buffer. After reconstitution, store at -20 °C to -80 °C in a manual defrost freezer. A seven-point standard curve usi ng 2-fold serial dilutions in sample dilution buffer, and a high standard of 2000 pg/mL is recommended.

Sensitivity: The minimum detectable dose of Human LCN1 / Lipocalin 1 was determined to be approximately 31.25 pg/mL. This is defined as at least three times standard deviations above the mean optical density of 10 replicates of the zero standard.
  • Capture Ab
  • Detection Ab
  • Standard
Material not included CBS - 0.05 M
Na2CO3 - 0.05 M
NaHCO3, pH 9.6, 0.2 μm filtered
TBS - 25 mM
Tris, adjust pH to 7.4 by HCl
Wash Buffer - 0.05 % Tween20 in TBS, pH 7.2 - 7.4
Blocking Buffer - 5 % BSA in Wash Buffer
Sample dilution buffer - 0.5 % BSA in wash buffer, pH 7.2 - 7.4, 0.2 μm filtered
Detection antibody dilution buffer - 0.5 % BSA in wash buffer, pH 7.2 - 7.4, 0.2 μm filtered
Substrate Solution: To achieve best assay results, fresh substrate solution is recommended Substrate stock solution - 10 mg/mL TMB (Tetramethylbenzidine ) in DMSO Substrate dilution buffer - 0.05 M Na2HPO4 and 0.025 M citric acid , adjust pH to 5.5
Substrate working solution - For each plate dilute 250 μL substrate stock solution in 25 mL substrate dilutionbuffer and then add 80 μL 0.75 % H2O2 , mix it well
Stop Solution - 2 N H2SO4
Alternative Name LCN1
Background Lipocalin-1, also known as Von Ebner gland protein, VEG protein, Tear prealbumin, VEGP, Tear lipocalin and LCN1, isa secreted protein which belongs to the calycin superfamily and Lipocalin family. Human Lipocalin-1 / VEGP wasoriginally described as a major protein of human tear fluid, which was thought to be tear specific. Lipocalin-1 / VEGP isidentical with lingual von Ebner's gland protein, and is also produced in prostate, nasal mucosa and tracheal mucosa. Homologous proteins have been found in rat, pig and probably dog and horse. Lipocalin-1 / VEGP is an unusuallipocalin member, because of its high promiscuity for relative insoluble lipids and binding characteristics that differ fromother members. Lipocalin-1 / VEGP acts as the principal lipid binding protein in tear fluid, a more general physiologicalfunction has to be proposed due to its wide distribution and properties. Lipocalin-1 / VEGP would be ideally suited forscavenging of lipophilic, potentially harmful substances and thus might act as a general protection factor of epithelia. Lipocalin-1 / LCN1 could play a role in taste reception. It could be necessary for the concentration and delivery of sapidmolecules in the gustatory system. Lipocalin-1 / LCN1 can bind various ligands, with chemical structures ranging fromlipids and retinoids to the macrocyclic antibiotic rifampicin and even to microbial siderophores. It exhibits an extremelywide ligand pocket.
Research Area Proteolysis / Ubiquitin
Application Notes Optimal working dilution should be determined by the investigator.
Protocol This ELISA Pair Set is a solid phase sandwich ELISA (Enzyme-Linked Immunosorbent Assay). It utilizes a monoclonal antibody specific for LCN1 / Lipocalin 1 coated on a 96-well plate. Standards and samples are added to the wells, and any LCN1 / Lipocalin 1 present binds to the immobilized antibody. The wells are washed and a horseradish peroxidase conjugated mouse anti-LCN1 / Lipocalin 1 monoclonal antibody is then added, producing an antibody-antigen-antibody "sandwich". The wells are again washed and TMB substrate solution is loaded, which produces color in proportion to the amount of LCN1 / Lipocalin 1 present in the sample. To end the enzyme reaction, the stop solution is added and absorbances of the microwell are read at 450 nm.
Reagent Preparation
  1. Dilute the capture antibody to the working concentration in CBS. Immediately coat a 96-well microplate with 100 μL per well of the diluted capture antibody. Seal the plate and incubate overnight at 4 °C.
    2. Aspirate each well and wash with at least 300 μL wash buffer, repeating the process two times for a total of three washes. Complete removal of liquid at each step is essential for good performance. After the last wash, remove any remaining wash buffer by inverting the plate and blotting it against clean paper towels.
    3. Block plates by adding 300 μL of blocking buffer to each well. Incubate at room temperature for a minimum of 1 hour.
    4. Repeat the aspiration/wash as in step 2. The plates are now ready for sample addition.
Assay Procedure
  1. Add 100 μL of sample or standards in sample dilution buffer per well. Seal the plate and incubate 2 hours at roomtemperature.
    2. Repeat the aspiration/wash as in step 2 of plate preparation.
    3. Add 100 μL of the detection antibody, diluted in antibody dilution buffer, to each well. Seal the plate and incubate 1hour at room temperature.
    4. Repeat the aspiration/wash as in step 2 of plate preparation.
    5. Add 200 μL of substrate solution to each well. Incubate for 20 minutes at room temperature (if substrate solutionis not as requested, the incubation time should be optimized). Avoid placing the plate in direct light.
    6. Add 50 μL of stop solution to each well. Gently tap the plate to ensure thorough mixing.
    7. Determine the optical density of each well immediately, using a microplate reader set to 450 nm.
Calculation of Results

Calculate the mean absorbance for each set of duplicate standards, controls and samples. Subtract the mean zero standard absorbance from each. 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. To determine the concentration of the unknowns, find the unknowns' mean absorbance value on the y-axis and draw a horizontal line to the standard curve. At the point of intersection, draw a vertical line to the x-axis and read the concentration. If samples have been diluted, the concentration read from the standard curve must be multiplied by the dilution factor. Alternatively, computer-based curve-fitting statistical software may also be employed to calculate the concentration of the sample.

Restrictions For Research Use only
Format Liquid
Handling Advice Avoid repeated freeze-thaw cycles.
Storage -20 °C,-80 °C
Storage Comment Capture Antibody: Aliquot and store at -20°C to -80°C for up to 6 months from date of receipt. Avoid repeated freeze-thaw cycles.

Detection Antibody: Protect it from prolonged exposure to light. Aliquot and store at -20°C to -80°C and for up to 6 months from date of receipt. Avoid repeated freeze-thaw cycles.

Standard: Store lyophilized standard at -20°C to -80°C for up to 6 months from date of receipt. Aliquot and store the reconstituted Standard at -80°C for up to 1 month. Avoid repeated freeze-thaw cycles.
Expiry Date 6 months
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