EK06639HU    Human Interleukin 2 Antibody (Anti-IL2) ELISA Kit        Version 16.3   December 05, 2025

Human Interleukin 2 Antibody (Anti-IL2) ELISA Kit

Cat.No.: EK06639HU

Store the kit at 2°C-8°C !

Valid Period: Six Months (2°C-8°C)!

Specification: 48 well kit or 96 well kit

FOR LAB REAGENT/RESEARCH USE ONLY!

NOT FOR THERAPEUTIC OR DIAGNOSTIC APPLICATIONS!

1. INTENDED USE AND PRINCIPLE OF THE ASSAY

The kit uses a qualitative enzyme-linked immunosorbent assay (ELISA) to qualitatively analyze Human Interleukin 2 Antibody (Anti-IL2) in undiluted original Human serum or plasma samples. For other sample types please contact tech support to determine compatibility with this assay. This kit is not suitable for assaying non-biological sources of substances. This kit is in vitro research use only! Not for therapeutic or diagnostic applications!

2. SAMPLE COLLECTION AND STORAGES

Serum – Centrifuge serum for approximately 20 minutes at 1000×g (or 3000 rpm) within 30 minutes after collection. Collect the supernatants carefully, assay immediately or store samples at -20°C or -80°C. Avoid repeated freeze/thaw cycles.

Plasma – Collect plasma using EDTA, Heparin or Trisodium Citrate as an anticoagulant. Centrifuge samples for approximately 20 minutes at 1000×g (or 3000 rpm) within 30 minutes after collection. Collect the supernatants carefully, assay immediately or store samples at -20°C or -80°C. Avoid repeated freeze/thaw cycles.

Other biological fluids – Remove particulates by centrifugation (approximately 20 minutes at 1000×g (or 3000 rpm) within 30 minutes after collection) and assay immediately or store samples at -20°C. Avoid repeated freeze-thaw cycles.

3. SAMPLE PREPARATION

Serum and plasma to be used within 7 days may be stored at 2-8°C, otherwise samples must be stored at -20 or -80°C to avoid loss of bioactivity and contamination. Avoid freeze-thaw cycles. When performing the assay slowly bring samples to room temperature. The samples should be centrifugated adequately, and hemolyzed samples or samples with granules are not suitable for use in this assay.

4. MATERIALS SUPPLIED

5. PRECAUTIONS

1) The operation should be carried out in strict according to the instructions.

2) Avoid cross-contamination when changing tips, and pipette reagents and samples into the center of each well.

3) The samples should be transferred into the assay wells within 15 minutes.

4) If the blue color too shallow after 15 minutes incubation with the substrates, it may be appropriate to extend the incubation time.

5) Do not mix the reagents from different batches

6) Chromogenic Substrate B is light-sensitive, please avoid prolonged exposure to light.

6. MATERIALS REQUIRED BUT NOT SUPPLIED

1) Distilled water.

2) Absorbent papers or paper towels.

3) Pipettes and disposable pipette tips.

4) An ELISA reader capable of measuring absorbance at 450 nm.

5) An incubator which can provide stable incubation conditions up to 37°C±0.5°C.

7. WASHING METHOD

Manual Washing – Dump the incubation mixtures of the wells into a sink or proper waste container. Using pipette or squirt bottle, fill each well completely with Wash Solution (1×), after about one minute's standing, invert and hit the Plate onto absorbent papers or paper towels until no moisture appears. Repeat this procedure four times. Note: Hold the sides of the Plate frame firmly when washing the Plate to assure that all strips remain securely in frame.

Automated Washing – Aspirate all wells, then wash the Plate four times using Wash Buffer (1×). Always adjust your washer to aspirate as much liquid as possible and set fill volume at 350μl/well/wash. After final wash, invert the Plate, and blot dry by hitting the Plate onto absorbent paper or paper towels until no moisture appears.

8. Storage

Please store the Plate and all reagents at 2°C-8°C.

1) The valid period of this kit is six months at 2°C-8°C. The kit should not be used beyond the expiration date.

2) Wash Solution (1×) – Dilute one volume of Wash Solution (20×) with nineteen volumes of deionized or distilled water. Diluted Wash Solution is stable for one month at 2°C-8°C. Undiluted Wash Solution and other reagents are stable for six months at 2°C-8°C.

3) When the kit is opened, please used up all the Plate as soon as possible after removed the Plate from the foil pouch. The Plate is detachable, so please return the unused wells to the foil pouch containing the desiccant pack, and reseal along entire edge of zip-seal for preventing damps. The remaining reagents still need to be stored at 2°C-8°C.

9. ASSAY PROCEDURE

1) First, check the Plate and equipment before your experiments and make sure they are no problem, check the label and the color of the cap of each vial/bottle and make sure they are all matched and no mistake (Please check the table in the 4. MATERIALS SUPPLIED). Bring all reagents and samples to room temperature (18°C-25°C) naturally for 30min before starting assay procedures. DO NOT use hot water baths to thaw samples or reagents. If necessary, doing a low-speed centrifugation for one or two seconds to concentrate the Positive/Negative Controls to the bottom of the vials. The Plate is detachable, detach unused strips from the Plate frame, return them to the foil pouch with the desiccant pack, and reseal for preventing damps.

2) Set Positive Control wells, Negative Control wells and Sample wells. Add Positive Control 50μl to each Positive Control well, add Negative Control 50μl to each Negative Control well. Add sample 50μl to each Sample wells.

Note: This kit is designed to be used with undiluted samples.

PC: Positive Control; NC: Negative Control; S01-S94: Sample

3) Add 100μl of HRP-conjugate reagent to Positive Control wells, Negative Control wells and Sample wells, cover with an adhesive strip and incubate for 60 minutes at 37°C.

4) Wash the Plate 4 times.

5) Add Chromogen Solution A 50μl and Chromogen Solution B 50μl to each well successively. Gently mix and then protect from light to incubate for 15 minutes at 37°C.

6) Add 50μl Stop Solution to each well. The color in the wells should change from blue to yellow. If the color in the wells is green or the color change does not appear uniform, gently tap the Plate to ensure thorough mixing.

7) Read the Optical Density (O.D.) at 450 nm using an ELISA reader within 15 minutes after adding Stop Solution (Around 5 minutes is the best time.).

10. DETERMINE THE RESULT

1) The average OD values of the Positive control wells is typically ≥1.0; the average OD values of the Negative control wells is typically ≤0.2.

2) Actual OD values of the Positive and Negative control wells may vary depending on the assay conditions.

3) Cut-off values were the average OD values of the Negative control wells +0.15 in samples tested by the laboratory. Each researcher should determine their own cut-off values for their samples.

11. ASSAY PERFORMANCES

Intra-assay CV (%) and Inter-assay CV (%) are less than 15%.

EK06639HU    Human Interleukin 2 Antibody (Anti-IL2) ELISA Kit        Version 16.3   December 05, 2025