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Microsoft word - kt-56058.doc

For the quantitative determination of rabbit E2 in
serum, plasma, cell culture fluid and other biological fluids
For Research Use Only. Not for use in diagnostic procedures.
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Product Information
Cat. No. KT-56058
This E2 ELISA kit is intended for laboratory research use only and not for use in diagnostic or therapeutic
procedures. The stop solution changes the color from blue to yellow and the intensity of the color is
measured at 450 nm using a spectrophotometer. In order to measure the concentration of E2 in the
sample, this E2 ELISA kit includes a set of calibrators. The calibrators are assayed at the same time as
the samples and allow the operator to produce a calibration curve of optical density versus E2
concentration. The concentration of E2 in the samples is then determined by comparing the O.D. of the
samples to the calibration curve.

The coated well immunoenzymatic assay for the quantitative measurement of E2 utilizes a polyclonal
anti-E2 antibody and an E2-HRP conjugate. The assay sample and buffer are incubated together with
E2-HRP conjugate in pre-coated plate for one hour. After the incubation period, the wells are decanted
and washed five times. The wells are then incubated with a substrate for HRP enzyme. The product of
the enzyme-substrate reaction forms a blue colored complex. Finally, a stop solution is added to stop the
reaction, which will then turn the solution yellow. The intensity of color is measured
spectrophotometrically at 450 nm in a microplate reader. The intensity of the color is inversely
proportional to the E2 concentration since E2 from samples and E2-HRP conjugate compete for the anti-
E2 antibody binding site. Since the number of sites is limited, as more sites are occupied by E2 from the
sample, fewer sites are left to bind E2-HRP conjugate. Calibrators of known E2 concentrations are run
concurrently with the samples being assayed and a calibration curve is plotted relating the intensity of the
color (O.D.) to the concentration of E2. The E2 concentration is interpolated from this calibration curve.


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Note: The lysis buffer solution is used only when the sample is cell culture fluid & body fluid & tissue
homogenate; If the sample is serum or blood plasma, then the lysis buffer solution is a superfluous


All reagents provided are stored at 4°C. Refer to the expiration date on the label.
Use a serum separator tube (SST) and allow samples to clot for 30 minutes before a centrifugation for 15
minutes at approximately 1,000 x g. Remove serum and assay immediately or aliquot and store samples
at -20°C or -80°C.
Collect plasma using EDTA or heparin as an anticoagulant. Centrifuge samples for 15 minutes at 1,000 x
g at 4°C within 30 minutes of collection. Store samples at -20°C or -80°C. Avoid repeated freeze-thaw
Cell culture fluid and other biological fluids
Remove particulates by centrifugation and assay immediately or aliquot and store samples at -20°C or
-80°C. Avoid repeated freeze-thaw cycles.
NOTE: Serum, plasma, and cell culture fluid samples to be used within 7 days may be stored at 4°C,
otherwise samples must be stored at -20°C (≤2 months) or -80°C (≤6 months) to avoid loss of bioactivity
and contamination. Avoid freeze-thaw cycles. When performing the assay, warm up samples to room
temperature slowly. DO NOT USE HEAT-TREATED SAMPLES.
1. Microplate reader capable of measuring absorbance at 450 nm.
2. Pipettes and pipette tips.
3. 100 mL and 1 liter graduated cylinders.
4. Calibrated adjustable precision pipettes, preferably with disposable plastic tips. (A manifold multi-
channel pipette is desirable for large assays.) 5. 37°C incubator. 6. Absorbent paper. 7. Distilled or de-ionized water 8. Data analysis and graphing software. Graph paper: linear (Cartesian), log-log or semi-log, or log-logit 9. Tubes to prepare calibrator or sample dilutions.
1. Ka
n is only responsible for the kit itself, but not for the samples consumed during the assay. The user should calculate the possible amount of the samples used in the whole test. Please reserve sufficient samples in advance. 2. Please predict the concentration before assaying. If values for these are not within the range of the calibration curve, users must determine the optimal sample dilutions for their particular experiments. 3. If the samples are not indicated in the manual, a preliminary experiment to determine the validity of 4. Owing to the possibility of mismatching between antigen from other resource and antibody used in our kits (e.g. antibody targets conformational isotope rather than linear isotope), some native or recombinant proteins from other manufacturers may not be recognized by our products. 5. Influenced by the factors including cell viability, cell number and also sampling time, samples from cell culture supernatant may not be detected by the kit. 6. Fresh samples without long term storage is recommended for the test. Otherwise, protein degradation and denaturalization may occur in those samples and finally lead to wrong results. Page 3 of 5

Bring all kit components and samples to room temperature (18-25°C) before use.
Dispense 10 µL of lysis buffer solution into 100 µL specimens, mix and stand for one hour (The proportion
of lysis buffer and specimens shall be no less than 1:10). (NOTE: This step is required when the sample
is cell culture fluid & body fluid & tissue homogenate; If the sample is serum or blood plasma, then this
step should be skipped.)

Wash Solution
Dilute 10 mL of Wash Solution concentrate (100X) with 990 mL of de-ionized or distilled water to prepare
1,000 mL of Wash Solution (1X).

It is recommended that all Calibrators and Samples be added in duplicate to the Microtiter Plate.
1. Secure the desired number of coated wells in the holder then add 100 µL of Calibrators or Samples to
the appropriate well of the antibody pre-coated Microtiter Plate. 2. Add 50 µL of Conjugate to each well. Mix well. Mixing well in this step is important. Cover and 3. Wash the Microtiter Plate using one of the specified methods indicated below: 4. Manual Washing: Remove incubation mixture by aspirating contents of the plate into a sink or proper waste container. Fill in each well completely with diluted wash solution, and then aspirate contents of the plate into a sink or proper waste container. Repeat this procedure five times for a total of five washes. After washing, invert plate, and blot dry by hitting plate onto absorbent paper or paper towels until no moisture appears. Note: Hold the sides of the plate frame firmly when washing the plate to assure that all strips remain securely in frame. Complete removal of liquid at each step is essential to good performance. 5. Automated Washing: Wash plate five times with diluted wash solution (350-400 µL/well/wash) using an auto washer. After washing, dry the plate as above. It is recommended that the washer be set for a soaking time of 10 seconds and shaking time of 5 seconds between each wash. 6. Add 50 µL Substrate A and 50 µL Substrate B to each well, subsequently. Cover and incubate for 10 7. Add 50 µL of stop solution to each well. Mix well.
8. Read the optical density (O.D.) at 450 nm using a microtiter plate reader immediately.


1. This calibration curve is used to determine the amount of an unknown sample. Construct a calibration curve by plotting the average O.D. (450 nm) for each calibrator on the vertical (Y) axis against the concentration on the horizontal (X) axis, and draw a best fit curve through the points on the graph. 2. First, calculate the mean O.D. value for each calibrator and sample. All O.D. values are subtracted by the mean value of the blank control before result interpretation. Construct the calibration curve using graph paper or statistical software. 3. To determine the amount in each sample, first locate the O.D. value on the Y-axis and extend a horizontal line to the calibration curve. At the point of intersection, draw a vertical line to the X-axis and read the corresponding concentration. 4. Any variation in operator, pipetting and washing technique, incubation time or temperature, and kit age can cause variation in result. Each user should obtain their own calibration curve. 5. The sensitivity in this assay is 0.1 nmol/L. 6. This assay has high sensitivity and excellent specificity for detection of E2. No significant cross- reactivity or interference between E2 and analogues was observed. Note: Limited by current skills and knowledge, it is impossible for us to complete the cross-reactivity detection between E2 and all the analogues, therefore, cross reaction may still exist in some cases.
Disposal Note Safety
1. This kit contains materials with small quantities of sodium azide. Sodium azide reacts with lead and
copper plumbing to form explosive metal azides. Upon disposal, flush drains with a large volume of Page 4 of 5
water to prevent azide accumulation. Avoid ingestion and contact with eyes, skin, and mucous membranes. In case of contact, rinse affected area with plenty of water. Observe all federal, state, and local regulations for disposal. 2. All blood components and biological materials should be handled as potentially hazardous. Follow universal precautions as established by the Centers for Disease Control and Prevention and by the Occupational Safety and Health Administration when handling and disposing of infectious agents.
1. When not in use, kit components should be refrigerated. All reagents should be warmed to room
2. Microtiter plates should be allowed to come to room temperature before opening the foil bags. Once the desired number of strips has been removed, immediately reseal the bag and store at 4°C to maintain plate integrity. 3. Samples should be collected in pyrogen/endotoxin-free tubes. 4. Samples should be frozen if not analyzed shortly after collection. Avoid multiple freeze-thaw cycles of frozen samples. Thaw completely and mix well prior to analysis. 5. When possible, avoid use of badly hemolyzed or lipemic sera. If large amounts of particulate matter are present, centrifuge or filter prior to analysis. 6. It is recommended that all calibrators, controls, and samples be run in duplicate. 7. When pipetting reagents, maintain a consistent order of addition from well-to-well. This ensures 8. Cover or cap all reagents when not in use. 9. Do not mix or interchange different reagent lots from various kit lots. 10. Do not use reagents after the kit expiration date. 11. Read absorbances within 2 hours of assay completion. 12. All residual wash liquid must be drained from the wells by efficient aspiration or by decantation followed by tapping the plate forcefully on absorbent paper. Never insert absorbent paper directly into the wells. 13. Because stabilized Chromogen is light sensitive, avoid prolonged exposure to light. Also avoid contact between stabilized Chromogen and metal, otherwise color may develop. 14. Incomplete washing will adversely affect the test outcome. All washing must be performed with wash 15. Washing can be performed manually as follows: completely aspirate the liquid from all wells by gently lowering an aspiration tip into the bottom of each well. Take care not to scratch the inside of the well. 16. After aspiration, fill the wells with at least 0.4 mL of diluted wash solution. Let soak for 15 to 30 seconds, and then aspirate the liquid. Repeat as directed under Assay Procedure. After the washing procedure, the plate is inverted and tapped dry on absorbent tissue. 17. Alternatively, the wash solution may be put into a squirt bottle. If a squirt bottle is used, flood the plate with wash buffer, completely filling all wells. 18. If using an automated washer, the operating instructions for washing equipment should be carefully 19. Assay Procedure Preliminary notes: Do not mix reagents from different lots. It is recommended that assays be performed in duplicate. Calibrators and samples must be assayed at the same time. Avoid exposing the substrate to direct sunlight. FOR RESEARCH USE ONLY. Not for use in diagnostic procedures.
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