QuicKey Human RBP4(Retinol Binding Protein 4, Plasma) ELISA Kit

    • QuicKey ELISA-Elabscience
    • ELISA-Elabscience
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    • QuicKey ELISA-Elabscience
    • ELISA-Elabscience
    • QuicKey ELISA-Elabscience
    • ELISA-Elabscience

      Catalog number:E-TSEL-H0006

      Size:
      • 96T
      Qty:
      - +
      Price: $390

      Reactivity: Human

      Detection Range: 3.13~100 ng/mL

      Sensitivity: 1.98 ng/mL

      Lead Time: 7~10 daysWelcome to order from local distributors.

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      QuicKey Series


      Get more sensitive and precise results with saving at least 1h comparing to traditional ELISA Kits. The new developed technology in house will help to accelerate your science research in a more efficient way.

       

      Intended use

      This ELISA kit applies to the in vitro quantitative determination of Human RBP4 concentrations in serum, plasma, urine. Please consult technical support for the applicability if other biological fluids need to be tested.

       

      Background

      Retinol binding protein 4(RBP4), previously called retinol binding protein(RBP), is a transporter protein. This protein belongs to the lipocalin family and is the specific carrier for retinol (vitamin A alcohol) in the blood [1]. It delivers retinol from the liver stores to the peripheral tissues. In plasma, the RBP-retinol complex interacts with transthyretin which prevents its loss by filtration through the kidney glomeruli. A deficiency of vitamin A, blocks secretion of the binding protein post translationally and results in defective delivery and supply to the epidermal cells.RBP4 seems to be correlated with cardio metabolic markers in inflammatory chronic diseases, including obesity, type 2 diabetes, metabolic syndrome, and cardiovascular diseases (CVDs) [2].

       

      1. Rask L, Anundi H, Fohlman J, et al. The complete amino acid sequence of human serum retinol-binding protein. [J]. Upsala Journal of Medical Sciences, 1987, 92(2):115.

      2. Bobbert P, Weithäuser A, Andres J, et al. Increased plasma retinol binding protein 4 levels in patients with inflammatory cardiomyopathy [J]. European Journal of Heart Failure, 2014, 11(12):1163-1168.

       

      Test principle

      This ELISA kit uses the Sandwich-ELISA principle. The micro ELISA plate provided in this kit has been pre-coated with an antibody specific to Human RBP4. Samples (or Standards) and biotinylated detection antibody specific for Human RBP4 are added to the micro ELISA plate wells. Human RBP4 would combine with the specific antibody. Then Avidin-Horseradish Peroxidase (HRP) conjugate are added successively to each micro plate well and incubated. Free components are washed away. The substrate solution is added to each well. Only those wells that contain Human RBP4, biotinylated detection antibody and Avidin-HRP conjugate will appear blue in color. The enzyme-substrate reaction is terminated by the addition of stop solution and the color turns yellow. The optical density (OD) is measured spectrophotometrically at a wavelength of 450 ± 2 nm. The OD value is proportional to the concentration of Human RBP4. You can calculate the concentration of Human RBP4 in the samples by comparing the OD of the samples to the standard curve.


      Assay type

      Sandwich-ELISA

      Format

      96T/48T

      Assay time

      2.5h

      Reactivity

      Human

      Detection method

      Colormetric

      Detection range

      3.13-100 ng/mL

      Sensitivity

      1.98 ng/mL

      Sample volume

      50μL

      Sample type

      Serum, Plasma, Urine


      Specificity

      This kit recognizes Human RBP4 in samples. No significant cross-reactivity or interference between RBP4 and analogues was observed.


      Typical data

      As the OD values of the standard curve may vary according to the conditions of  the actual assay performance (e.g. operator, pipetting technique, washing technique or temperature effects), the operator should establish a standard curve for each test. Typical standard curve and data is provided below for reference only.

      Concentration(ng/mL)

      100

      50

      25

      12.5

      6.25

      3.13

      0

      OD

      2.549

      1.752

      0.924

      0.423

      0.175

      0.099

      0.071

      Corrected OD

      2.478

      1.681

      0.853

      0.352

      0.104

      0.028

      -

       

      Sample values

      Serum/Plasma/Urine–Samples from apparently healthy volunteers were evaluated for the presence of Human RBP4 in this assay.

      Sample Type

      Source

      Range

      Dilution Factor

      Serum (n=14)

      Healthy human

      13.5-58μg/mL

      500-5000

      EDTA plasma (n=14)

      Healthy human

      15.6-55.89μg/mL

      500-5000

      Urine (n=12)

      Healthy human

      15.32-250.65ng/mL

      1-40

       

      Precision

      Intra-assay Precision (Precision within an assay): 3 samples with low, mid range and high level Human RBP4 were tested 20 times on one plate, respectively.

      Inter-assay Precision (Precision between assays): 3 samples with low, mid range and high level Human RBP4 were tested on 3 different plates,20 replicates in each plate.

       

      Intra-assay Precision

      Inter-assay Precision

      Sample

      1

      2

      3

      1

      2

      3

      n

      20

      20

      20

      20

      20

      20

      Mean(ng/mL)

      4.61

      11.48

      43.5

      4.8

      11.26

      42.82

      Standard deviation

      0.24

      0.53

      1.81

      0.25

      0.51

      1.94

      CV (%)

      5.21

      4.62

      4.16

      5.21

      4.53

      4.53

       

      Recovery

      The recovery of Human RBP4 spiked at three different levels in samples throughout the range of the assay was evaluated in various matrices.

      Sample Type

      Range (%)

      Average Recovery (%)

      Serum (n=14)

      89-102

      96

      EDTA plasma (n=14)

      91-105

      99

      Urine(n=12)

      89-97

      92

       

      Linearity

      Samples were spiked with high concentrations of Human RBP4 and diluted with Reference Standard & Sample Diluent to produce samples with values within the range of the assay.

       

       

      Serum (n=4)

      EDTA plasma (n=4)

      Urine(n=4)

      1:2

      Range (%)

      90-101

      88-96

      99-110

      Average (%)

      98

      92

      104

      1:4

      Range (%)

      85-100

      95-109

      88-101

      Average (%)

      92

      101

      96

      1:8

      Range (%)

      100-109

      100-109

      92-101

      Average (%)

      103

      105

      95

      1:16

      Range (%)

      101-109

      99-108

      90-101

      Average (%)

      105

      102

      93

       

      Kit components & Storage

      An unopened kit can be stored at 2-8℃ for six months. After test, the unused wells and reagents should be stored according to the table below.

      Item

      Specifications

      Storage conditions after test

      Micro ELISA Plate (Dismountable)

      96T: 8 wells ×12 strips

      48T: 8 wells ×6 strips

      2-8℃, 1 month

      Reference Standard

      96T: 2 vials

      48T: 1 vial

      Discard unused reconstituted standard and dilutions

      Reference Standard & Sample Diluent

      1 vial, 20 mL

      2-8℃

      Biotinylated Detection Ab Working Solution

      1 vial, 6 mL

      HRP Conjugate Diluent

      1 vial, 14 mL

      Concentrated Wash Buffer (25×)

      1 vial, 30 mL

      Concentrated HRP Conjugate (100×)

      96T: 1 vial, 120 μL

      48T: 1 vial, 60 μL

      2-8℃(Protect from light)

      Substrate Reagent

      1 vial, 10 mL

      Stop Solution

      1 vial, 10 mL

      2-8℃

      Plate Sealer

      5 pieces

       

      Product Description

      1 copy

      Certificate of Analysis

      1 copy

      Note: All reagent bottle caps must be tightened to prevent evaporation and microbial pollution.

      The volume of reagents in partial shipments is a little more than the volume marked on the label, please use accurate measuring equipment instead of directly pouring into the vial(s).


      Other supplies required

      Microplate reader with 450 nm wavelength filter

      High-precision transfer pipette, EP tubes and disposable pipette tips

      37℃ Incubator

      Deionized or distilled water

      Absorbent paper

      Loading slot for Wash Buffer


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