Human Apolipoprotein A-I/APOA1 ELISA Kit- High Sensitivity

Product Name:	Human Apolipoprotein A-I / APOA1 ELISA Kit
Product Code:	HUFI00392
Size:	96 Assays
Alias:	APOA1, Apo-A1, Alp-1, Brp-14, Ltw-1, Lvtw-1, Sep-1, Sep-2, apo-AI, Apo-AI, ApoA-I, apoA-I, Apolipoprotein A1, apolipoprotein A-I, MGC117399
Detection method:	Sandwich ELISA, Double Antibody
Application:	This immunoassay kit allows for the in vitro quantitative determination of Human APOA1 concentrations in serum plasma and other biological fluids.
Sensitivity:	0.188ng/ml
Range:	0.313-20ng/ml
Storage:	4°C for 6 months
Note:	For Research Use Only

Recovery:

Matrices listed below were spiked with certain level of Human APOA1 and the recovery rates were calculated by comparing the measured value to the expected amount of Human APOA1 in samples.

Matrix	Recovery range(%)	Average(%)
serum(n=5)	88-105	96
EDTA plasma(n=5)	86-99	93
UFH plasma(n=5)	91-105	98

Linearity:

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of Human APOA1 and their serial dilutions. The results were demonstrated by the percentage of calculated concentration to the expected.

Sample	1:2	1:4	1:8
serum(n=5)	95-104%	91-105%	86-105%
EDTA plasma(n=5)	82-91%	83-91%	90-101%
UFH plasma(n=5)	85-100%	82-96%	80-89%

CV(%):

Intra-Assay: CV<8%
Inter-Assay: CV<10%

Component	Quantity	Storage
ELISA Microplate (Dismountable)	8×12 strips	4°C for 6 months
Lyophilized Standard	2	4°C/-20°C
Sample/Standard Dilution Buffer	20ml	4°C
Biotin-labeled Antibody(Concentrated)	120ul	4°C (Protect from light)
Antibody Dilution Buffer	10ml	4°C
HRP-Streptavidin Conjugate(SABC)	120ul	4°C (Protect from light)
SABC Dilution Buffer	10ml	4°C
TMB Substrate	10ml	4°C (Protect from light)
Stop Solution	10ml	4°C
Wash Buffer(25X)	30ml	4°C
Plate Sealer	5	-

Other materials and equipment required:

Microplate reader with 450 nm wavelength filter
Multichannel Pipette, Pipette, microcentrifuge tubes and disposable pipette tips
Incubator
Deionized or distilled water
Absorbent paper
Buffer resevoir

Uniprot

P02647

UniProt Protein Function:	APOA1: Participates in the reverse transport of cholesterol from tissues to the liver for excretion by promoting cholesterol efflux from tissues and by acting as a cofactor for the lecithin cholesterol acyltransferase (LCAT). As part of the SPAP complex, activates spermatozoa motility. Interacts with APOA1BP and CLU. Component of a sperm activating protein complex (SPAP), consisting of APOA1, an immunoglobulin heavy chain, an immunoglobulin light chain and albumin. Interacts with NDRG1. Major protein of plasma HDL, also found in chylomicrons. Synthesized in the liver and small intestine. The oxidized form at Met-110 and Met-136 is increased in individuals with increased risk for coronary artery disease, such as in carrier of the eNOSa/b genotype and exposure to cigarette smoking. It is also present in increased levels in aortic lesions relative to native ApoA-I and increased levels are seen with increasing severity of disease. Belongs to the apolipoprotein A1/A4/E family.
UniProt Protein Details:	Protein type:Lipid-binding; Secreted, signal peptide; Secreted; Vesicle; Motility/polarity/chemotaxis; Cell development/differentiation; Endoplasmic reticulum Chromosomal Location of Human Ortholog: 11q23-q24 Cellular Component: extracellular space; chylomicron; cell surface; endocytic vesicle; endoplasmic reticulum lumen; early endosome; extracellular region; plasma membrane; cytoplasmic vesicle; nucleus; cytosol; vesicle Molecular Function:identical protein binding; protein binding; enzyme binding; phospholipid transporter activity; lipase inhibitor activity; beta-amyloid binding; chemorepellent activity; cholesterol transporter activity; cholesterol binding; phospholipid binding; phosphatidylcholine binding; apolipoprotein A-I receptor binding; high-density lipoprotein binding; apolipoprotein receptor binding Biological Process: phototransduction, visible light; negative chemotaxis; negative regulation of lipase activity; axon regeneration in the peripheral nervous system; sequestering of lipid; negative regulation of interleukin-1 beta secretion; regulation of cholesterol absorption; transforming growth factor beta receptor signaling pathway; positive regulation of stress fiber formation; response to drug; platelet activation; cholesterol metabolic process; organ regeneration; regulation of Cdc42 protein signal transduction; adrenal gland development; positive regulation of hydrolase activity; positive regulation of Rho protein signal transduction; lipoprotein metabolic process; positive regulation of transferase activity; vitamin transport; cholesterol biosynthetic process; negative regulation of cytokine secretion during immune response; cholesterol homeostasis; lipoprotein biosynthetic process; response to estrogen stimulus; peptidyl-methionine modification; phosphatidylcholine biosynthetic process; positive regulation of lipoprotein lipase activity; blood vessel endothelial cell migration; cellular lipid metabolic process; platelet degranulation; phospholipid efflux; retinoid metabolic process; transmembrane transport; response to nutrient; phospholipid homeostasis; integrin-mediated signaling pathway; receptor-mediated endocytosis; positive regulation of fatty acid biosynthetic process; regulation of protein amino acid phosphorylation; cholesterol transport; protein stabilization; protein amino acid oxidation; negative regulation of heterotypic cell-cell adhesion; neurite regeneration; cholesterol efflux; G-protein coupled receptor protein signaling pathway; glucocorticoid metabolic process; reverse cholesterol transport; endothelial cell proliferation; negative regulation of inflammatory response; blood coagulation Disease: Hypoalphalipoproteinemia, Primary; Amyloidosis, Familial Visceral
NCBI Summary:	This gene encodes apolipoprotein A-I, which is the major protein component of high density lipoprotein (HDL) in plasma. The protein promotes cholesterol efflux from tissues to the liver for excretion, and it is a cofactor for lecithin cholesterolacyltransferase (LCAT) which is responsible for the formation of most plasma cholesteryl esters. This gene is closely linked with two other apolipoprotein genes on chromosome 11. Defects in this gene are associated with HDL deficiencies, including Tangier disease, and with systemic non-neuropathic amyloidosis. [provided by RefSeq, Jul 2008]
UniProt Code:	P02647
NCBI GenInfo Identifier:	113992
NCBI Gene ID:	335
NCBI Accession:	P02647.1
UniProt Secondary Accession:	P02647,Q6LDN9, Q6Q785, Q9UCS8, Q9UCT8, A8K866,
UniProt Related Accession:	P02647
Molecular Weight:	30,778 Da
NCBI Full Name:	Apolipoprotein A-I
NCBI Synonym Full Names:	apolipoprotein A-I
NCBI Official Symbol:	APOA1
NCBI Protein Information:	apolipoprotein A-I; apo-AI
UniProt Protein Name:	Apolipoprotein A-I
UniProt Synonym Protein Names:	Apolipoprotein A1Cleaved into the following 2 chains:Proapolipoprotein A-I; ProapoA-I; Truncated apolipoprotein A-IAlternative name(s):Apolipoprotein A-I(1-242)
Protein Family:	Apolipoprotein
UniProt Gene Name:	APOA1
UniProt Entry Name:	APOA1_HUMAN

*Note: Protocols are specific to each batch/lot. For the correct instructions please follow the protocol included in your kit.

Before adding to wells, equilibrate the SABC working solution and TMB substrate for at least 30 min at 37°C. When diluting samples and reagents, they must be mixed completely and evenly. It is recommended to plot a standard curve for each test.

Step	Protocol
1.	Set standard, test sample and control (zero) wells on the pre-coated plate respectively, and then, record their positions. It is recommended to measure each standard and sample in duplicate. Wash plate 2 times before adding standard, sample and control (zero) wells!
2.	Aliquot 0.1ml standard solutions into the standard wells.
3.	Add 0.1 ml of Sample / Standard dilution buffer into the control (zero) well.
4.	Add 0.1 ml of properly diluted sample ( Human serum, plasma, tissue homogenates and other biological fluids.) into test sample wells.
5.	Seal the plate with a cover and incubate at 37 °C for 90 min.
6.	Remove the cover and discard the plate content, clap the plate on the absorbent filter papers or other absorbent material. Do NOT let the wells completely dry at any time. Wash plate X2.
7.	Add 0.1 ml of Biotin- detection antibody working solution into the above wells (standard, test sample & zero wells). Add the solution at the bottom of each well without touching the side wall.
8.	Seal the plate with a cover and incubate at 37°C for 60 min.
9.	Remove the cover, and wash plate 3 times with Wash buffer. Let wash buffer rest in wells for 1 min between each wash.
10.	Add 0.1 ml of SABC working solution into each well, cover the plate and incubate at 37°C for 30 min.
11.	Remove the cover and wash plate 5 times with Wash buffer, and each time let the wash buffer stay in the wells for 1-2 min.
12.	Add 90 µl of TMB substrate into each well, cover the plate and incubate at 37°C in dark within 10-20 min. (Note: This incubation time is for reference use only, the optimal time should be determined by end user.) And the shades of blue can be seen in the first 3-4 wells (with most concentrated standard solutions), the other wells show no obvious color.
13.	Add 50 µl of Stop solution into each well and mix thoroughly. The color changes into yellow immediately.
14.	Read the O.D. absorbance at 450 nm in a microplate reader immediately after adding the stop solution.

When carrying out an ELISA assay it is important to prepare your samples in order to achieve the best possible results. Below we have a list of procedures for the preparation of samples for different sample types.

Sample Type	Protocol
Serum	If using serum separator tubes, allow samples to clot for 30 minutes at room temperature. Centrifuge for 10 minutes at 1,000x g. Collect the serum fraction and assay promptly or aliquot and store the samples at -80°C. Avoid multiple freeze-thaw cycles. If serum separator tubes are not being used, allow samples to clot overnight at 2-8°C. Centrifuge for 10 minutes at 1,000x g. Remove serum and assay promptly or aliquot and store the samples at -80°C. Avoid multiple freeze-thaw cycles.
Plasma	Collect plasma using EDTA or heparin as an anticoagulant. Centrifuge samples at 4°C for 15 mins at 1000 × g within 30 mins of collection. Collect the plasma fraction and assay promptly or aliquot and store the samples at -80°C. Avoid multiple freeze-thaw cycles. Note: Over haemolysed samples are not suitable for use with this kit.
Urine & Cerebrospinal Fluid	Collect the urine (mid-stream) in a sterile container, centrifuge for 20 mins at 2000-3000 rpm. Remove supernatant and assay immediately. If any precipitation is detected, repeat the centrifugation step. A similar protocol can be used for cerebrospinal fluid.
Cell culture supernatant	Collect the cell culture media by pipette, followed by centrifugation at 4°C for 20 mins at 1500 rpm. Collect the clear supernatant and assay immediately.
Cell lysates	Solubilize cells in lysis buffer and allow to sit on ice for 30 minutes. Centrifuge tubes at 14,000 x g for 5 minutes to remove insoluble material. Aliquot the supernatant into a new tube and discard the remaining whole cell extract. Quantify total protein concentration using a total protein assay. Assay immediately or aliquot and store at ≤ -20 °C.
Tissue homogenates	The preparation of tissue homogenates will vary depending upon tissue type. Rinse tissue with 1X PBS to remove excess blood & homogenize in 20ml of 1X PBS (including protease inhibitors) and store overnight at ≤ -20°C. Two freeze-thaw cycles are required to break the cell membranes. To further disrupt the cell membranes you can sonicate the samples. Centrifuge homogenates for 5 mins at 5000xg. Remove the supernatant and assay immediately or aliquot and store at -20°C or -80°C.
Tissue lysates	Rinse tissue with PBS, cut into 1-2 mm pieces, and homogenize with a tissue homogenizer in PBS. Add an equal volume of RIPA buffer containing protease inhibitors and lyse tissues at room temperature for 30 minutes with gentle agitation. Centrifuge to remove debris. Quantify total protein concentration using a total protein assay. Assay immediately or aliquot and store at ≤ -20 °C.
Breast Milk	Collect milk samples and centrifuge at 10,000 x g for 60 min at 4°C. Aliquot the supernatant and assay. For long term use, store samples at -80°C. Minimize freeze/thaw cycles.

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Human Apolipoprotein A-I / APOA1 ELISA Kit

Description