Product Name:	Human Pre-S1 ELISA Kit
Product Code:	HUFI04756
Size:	96 Assays
Alias:	Hepatitis B pre-S1 antigen ELISA Kit
Detection method:	Qualitative ELISA
Application:	This immunoassay kit allows for the in vitro quantitative determination of Human Pre-S1 concentrations in serum plasma and other biological fluids.
Sensitivity:	Qualitative
Range:	Qualitative
Storage:	4°C for 6 months
Note:	For Research Use Only

Recovery:

Matrices listed below were spiked with certain level of Human Pre-S1 and the recovery rates were calculated by comparing the measured value to the expected amount of Human Pre-S1 in samples.

Matrix	Recovery range(%)	Average(%)
serum(n=5)	95-102	98
EDTA plasma(n=5)	88-102	93
heparin plasma(n=5)	87-105	97

Linearity:

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of Human Pre-S1 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)	87-96%	90-105%	91-101%
EDTA plasma(n=5)	83-101%	98-101%	83-96%
UFH plasma(n=5)	80-99%	89-99%	83-95%

CV(%):

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

>

Component	Quantity	Storage
ELISA Microplate(Dismountable)	8×12 strips	2-8°C
Negative Control	1 vial	2-8°C
Positive Control	1 vial	2-8°C
Sample Dilution Buffer	1 vial	4°C (Protect from light)
HRP conjugated antibody	1 vial	2-8°C
Wash Buffer (20X)	2 x 25 mL	2-8°C
Substrate A	1 vial	2-8°C
Substrate B	1 vial	2-8°C (Protect from Light)
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

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

Step	Protocol
1.	Bring all reagents to room temperature before use.
2.	Label the sample wells, 2 Negative Controls, 2 Positive Controls and 1 blank well.
3.	Add 100 uL sample dilution buffer to each well, except blank well.
4.	Add 10uL sample, Negative Controls and Positive Controls to each well and gently tap the plate to ensure thorough mixing. Seal the plate with a cover and incubate at 37? for 60 min.
5.	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.
6.	Add 100 µL HRP- HBsAb to each well, except blank well.
7.	Seal the plate with a cover and incubate at 37°C for 30 mins.
8.	Wash: Remove the cover, and wash plate 5 times with Wash buffer.
9.	Add 50 ?l of TMB substrate A and 50 ?l of TMB substrate B into each well. Gently tap the plate to ensure thorough mixing. Cover the plate and incubate at 37? in dark within 30 min. And the shades of blue can be seen in the Positive Controls. Negative Controls wells show no obvious color.
10.	Add 50µl of Stop solution into each well and mix thoroughly. The colour changes into yellow immediately.
11.	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.