Description
Human DLK-1 (Delta Like 1 Homolog) ELISA Kit
The Human DLK-1 (Delta-like 1 homolog) ELISA Kit is designed for the precise measurement of DLK-1 levels in human serum, plasma, and cell culture supernatants. This kit offers exceptional sensitivity and specificity, ensuring consistent and accurate results for a variety of research purposes.DLK-1 is a key protein involved in various cellular processes, including cell differentiation and development. It plays a crucial role in regulating signaling pathways and gene expression, making it a valuable marker for studying developmental biology and disease progression.
By using the Human DLK-1 ELISA Kit, researchers can gain valuable insights into the functions of DLK-1 and its role in different biological processes. This kit is a valuable tool for researchers studying development, tissue regeneration, and disease mechanisms.
| Assay type: | Sandwich |
| Format: | 96T |
| Assay time: | 4.5h |
| Reactivity: | Human |
| Detection Method: | Colormetric |
| Detection Range: | 0.16-10 ng/mL |
| Sensitivity: | 0.10 ng/mL |
| Sample Volume Required Per Well: | 100µL |
| Sample Type: | Serum, plasma and other biological fluids |
| Specificity: | This kit recognizes Human DLK-1 in samples. No significant cross-reactivity or interference between Human DLK-1 and analogues was observed. |
This ELISA kit uses Sandwich-ELISA as the method. The micro ELISA plate provided in this kit has been pre-coated with an antibody specific to Human DLK-1. Standards or samples are added to the appropriate micro ELISA plate wells and combined with the specific antibody. Then a biotinylated detection antibody specific for Human DLK-1 and Avidin-Horseradish Peroxidase (HRP) conjugate are added to each micro plate well successively and incubated. Free components are washed away. The substrate solution is added to each well. Only those wells that contain Human DLK-1, biotinylated detection antibody and Avidin-HRP conjugate will appear blue in color. The enzyme-substrate reaction is terminated by adding Stop Solution and the color turns yellow. The optical density (OD) is measured spectrophotometrically at a wavelength of 450 nm ± 2 nm. The OD value is proportional to the concentration of Human DLK-1. The concentration of Human DLK-1 in samples can be calculated by comparing the OD of the samples to the standard curve.
| UniProt Protein Function: | DLK1: May have a role in neuroendocrine differentiation. Monomer. Found within the stromal cells in close contact to the vascular structure of placental villi, yolk sac, fetal liver, adrenal cortex and pancreas and in the beta cells of the islets of Langerhans in the adult pancreas. Found also in some forms of neuroendocrine lung tumor tissue. 2 isoforms of the human protein are produced by alternative splicing. |
| UniProt Protein Details: | Protein type:Membrane protein, integral Chromosomal Location of Human Ortholog: 14q32 Cellular Component: extracellular space Biological Process: negative regulation of Notch signaling pathway |
| NCBI Summary: | This gene encodes a transmembrane protein that contains multiple epidermal growth factor repeats that functions as a regulator of cell growth. The encoded protein is involved in the differentiation of several cell types including adipocytes. This gene is located in a region of chromosome 14 frequently showing unparental disomy, and is imprinted and expressed from the paternal allele. A single nucleotide variant in this gene is associated with child and adolescent obesity and shows polar overdominance, where heterozygotes carrying an active paternal allele express the phenotype, while mutant homozygotes are normal. [provided by RefSeq, Nov 2015] |
| UniProt Code: | P80370 |
| NCBI GenInfo Identifier: | 296439371 |
| NCBI Gene ID: | 8788 |
| NCBI Accession: | P80370. 3 |
| UniProt Secondary Accession: | P80370,P15803, Q96DW5, |
| UniProt Related Accession: | P80370 |
| Molecular Weight: | 33,067 Da |
| NCBI Full Name: | Protein delta homolog 1 |
| NCBI Synonym Full Names: | delta like non-canonical Notch ligand 1 |
| NCBI Official Symbol: | DLK1 |
| NCBI Official Synonym Symbols: | DLK; FA1; ZOG; pG2; DLK-1; PREF1; Delta1; Pref-1 |
| NCBI Protein Information: | protein delta homolog 1 |
| UniProt Protein Name: | Protein delta homolog 1 |
| UniProt Synonym Protein Names: | pG2 |
| Protein Family: | Protein |
| UniProt Gene Name: | DLK1 |
| UniProt Entry Name: | DLK1_HUMAN |
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) | O.D | Average | Corrected |
| 10 | 2.368 2.388 | 2.378 | 2.299 |
| 5 | 1.525 1.555 | 1.54 | 1.461 |
| 2.5 | 0.965 0.959 | 0.962 | 0.883 |
| 1.25 | 0.496 0.518 | 0.507 | 0.428 |
| 0.63 | 0.26 0.234 | 0.247 | 0.168 |
| 0.32 | 0.184 0.172 | 0.178 | 0.099 |
| 0.16 | 0.123 0.137 | 0.13 | 0.051 |
| 0 | 0.076 0.082 | 0.079 | -- |
Precision
Intra-assay Precision (Precision within an assay): 3 samples with low, mid range and high level Human DLK-1 were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, mid range and high level Human DLK-1 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) | 0.52 | 0.90 | 4.93 | 0.51 | 0.98 | 4.81 |
| Standard deviation | 0.03 | 0.05 | 0.23 | 0.03 | 0.05 | 0.15 |
| C V (%) | 5.77 | 5.56 | 4.67 | 5.88 | 5.10 | 3.12 |
Recovery
The recovery of Human DLK-1 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=5) | 84-95 | 90 |
| EDTA plasma (n=5) | 93-108 | 99 |
| Cell culture media (n=5) | 92-104 | 97 |
Linearity
Samples were spiked with high concentrations of Human DLK-1 and diluted with Reference Standard & Sample Diluent to produce samples with values within the range of the assay.
| Serum (n=5) | EDTA plasma (n=5) | Cell culture media (n=5) | ||
| 1:2 | Range (%) | 89-105 | 86-101 | 87-100 |
| Average (%) | 96 | 92 | 94 | |
| 1:4 | Range (%) | 90-100 | 85-95 | 84-98 |
| Average (%) | 95 | 90 | 89 | |
| 1:8 | Range (%) | 88-103 | 85-99 | 87-100 |
| Average (%) | 95 | 91 | 92 | |
| 1:16 | Range (%) | 87-99 | 79-92 | 81-94 |
| Average (%) | 93 | 85 | 87 |
An unopened kit can be stored at 4°C for 1 month. If the kit is not used within 1 month, store the items separately according to the following conditions once the kit is received.
| Item | Specifications | Storage |
| Micro ELISA Plate(Dismountable) | 8 wells ×12 strips | -20°C, 6 months |
| Reference Standard | 2 vials | |
| Concentrated Biotinylated Detection Ab (100×) | 1 vial, 120 µL | |
| Concentrated HRP Conjugate (100×) | 1 vial, 120 µL | -20°C(shading light), 6 months |
| Reference Standard & Sample Diluent | 1 vial, 20 mL | 4°C, 6 months |
| Biotinylated Detection Ab Diluent | 1 vial, 14 mL | |
| HRP Conjugate Diluent | 1 vial, 14 mL | |
| Concentrated Wash Buffer (25×) | 1 vial, 30 mL | |
| Substrate Reagent | 1 vial, 10 mL | 4°C(shading light) |
| Stop Solution | 1 vial, 10 mL | 4°C |
| Plate Sealer | 5 pieces | |
| Product Description | 1 copy | |
| Certificate of Analysis | 1 copy |
- Set standard, test sample and control (zero) wells on the pre-coated plate and record theirpositions. It is recommended to measure each standard and sample in duplicate. Note: addall solutions to the bottom of the plate wells while avoiding contact with the well walls. Ensuresolutions do not foam when adding to the wells.
- Aliquot 100 µL of standard solutions into the standard wells.
- Add 100 µL of Sample / Standard dilution buffer into the control (zero) well.
- Add 100 µL of properly diluted sample (serum, plasma, tissue homogenates and otherbiological fluids) into test sample wells.
- Cover the plate with the sealer provided in the kit and incubate for 90 min at 37 °C.
- Aspirate the liquid from each well, do not wash. Immediately add 100 µL of BiotinylatedDetection Ab working solution to each well. Cover the plate with a plate seal and gently mix. Incubate for 1 hour at 37 °C.
- Aspirate or decant the solution from the plate and add 350 µL of wash buffer to each welland incubate for 1-2 minutes at room temperature. Aspirate the solution from each well andclap the plate on absorbent filter paper to dry. Repeat this process 3 times. Note: a microplatewasher can be used in this step and other wash steps.
- Add 100 µL of HRP Conjugate working solution to each well. Cover with a plate seal andincubate for 30 min at 37 °C.
- Aspirate or decant the solution from each well. Repeat the wash process for five times asconducted in step 7.
- Add 90 µL of Substrate Reagent to each well. Cover with a new plate seal and incubate forapproximately 15 min at 37 °C. Protect the plate from light. Note: the reaction time can beshortened or extended according to the actual color change, but not by more than 30min.
- Add 50 µL of Stop Solution to each well. Note: Adding the stop solution should be done inthe same order as the substrate solution.
- Determine the optical density (OD value) of each well immediately with a microplate readerset at 450 nm.
