Infliximab ELISA Kit (Remsima®) Free drug

Product type:
Biosimilar ELISA
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Infliximab (Remsima®) ELISA Kit

Enzyme-linked immunosorbent assay for the quantitative determination of free Infliximab (Remsima®) in serum and plasma. Remsima® is the worlds first biosimilar mAb (approved in 2013 by EMA). The Committee for Medicinal Products for Human Use (CHMP) decided that in accordance with EU requirements, Remsima® has been shown to have a comparable quality, safety and efficacy profile to Remicade®. The Assay Genie Infliximab (Remsima®) ELISA has been specially developed for the quantitative analysis of free infliximab in serum and plasma samples.

Infliximab (Remsima®) ELISA Kit test principle

Solid phase enzyme-linked immunosorbent assay (ELISA) based on the sandwich principle. Standards and samples (serum or plasma) are incubated in the microtitre plate coated with the reactant for infliximab biosimilar (Remsima®). After incubation, the wells are washed. A horse radish peroxidase (HRP) conjugated probe is added and binds to infliximab captured by the reactant on the surface of the wells. Following incubation wells are washed and the bound enzymatic activity is detected by addition of chromogen substrate. The colour developed is proportional to the amount of infliximab in the sample or standard. Results of samples can be determined directly using the standard curve.

Infliximab ELISA Product Information

Information Description
Free drug
Required Volume (uL)
Total Time (min)
Sample Type
Serum, Plasma
Number of Assays
Detection Limit (ng/mL)
100 (ng/mL)
Spike Recovery (%)
Shelf Life (year)

Alternative Names

Tumour Necrosis Factor Alpha


Infliximab (Remsima®) - Key Information

Infliximab mode of action

Infliximab reduces the amount of active human tumour necrosis factor alpha (hTNF alpha) in the body by binding to it and preventing it from signalling the receptors for TNF alpha on the surface of various cell types. TNF alpha is one of the key cytokines that triggers and sustains the inflammatory reactions.

Infliximab uses

Remsima is a tumour necrosis factor alpha (TNF alpha) antagonist used to treat rheumatoid arthritis, ankylosing spondylitis, ulcerative colitis, adult Crohn's disease, plaque psoriasis, and psoriatic arthritis. Single intravenous (IV) infusions of 3 mg/kg to 20 mg/kg showed a linear relationship between the dose administered and the maximum serum concentration. The volume of distribution at steady state was independent of dose and indicated that infliximab was distributed primarily within the vascular compartment.

Median pharmacokinetic results for doses of 3 mg/kg to 10 mg/kg in rheumatoid arthritis and 5 mg/kg in Crohn's disease indicate that the terminal half-life of infliximab is 8.0 to 9.5 days. In controlled trials, clinical response rates of 20-40% have been achieved with above- mentioned regimens in Crohn's disease and rheumatoid arthritis.

However, the therapeutic benefits must be balanced against the risk of a variety of severe adverse events (e.g. severe infections including tuberculosis, hepatotoxicity, infusion reactions, serum sickness-like disease and lymphoma). The volume of distribution of infliximab is low (3-6 L) and represents the intravascular space.

Infliximab treatment

Elimination of infliximab is most probably accomplished through degradation by unspecific proteases. It seemed that methotrexate delayed the decline in the serum concentrations of infliximab. When relating serum concentrations to the clinical response in patients, it can be assumed that through concentrations above 1mg/mL could be used as a kind of therapeutic target. The rate of clinical remission was higher for patients with a detectable trough serum infliximab compared with patients in whom serum infliximab was undetectable, including those without antibodies. A detectable trough serum infliximab was also associated with a lower C-reactive protein and a higher rate of endoscopic improvement.

For Crohn's disease patients treated with scheduled maintenance infusions of infliximab, the serum concentration of infliximab seemed to predict clinical outcome. It was also proposed that, the surveillance of circulating infliximab concentration during maintenance therapy represents an indirect but reliable method to monitor anti-infliximab immunization. In this context, identification of biomarkers for (non-)response and risk factors for adverse drug reactions relating to serum concentrations and therapeutic drug monitoring of infliximab would be very helpful.

Infliximab ELISA Kit Contents

Size Kit Contents

1 x 12 x 8

Microtiter Plate

Break apart strips. Microtiter plate with 12 rows each of 8 wells coated with reactant

7 x 0.3 mL

Infliximab Standards A-E, High Level Control, Low Level Control
3; 1; 0.3; 0.1; 0 microgram/mL
Ready to use. Used for construction of the standard curve. Contains infliximab (Remisma®), human serum, stabilizer and <0.1% NaN3.

1 x 50 mL

Assay Buffer
Blue coloured. Ready to use. Contains proteins and <0.1% NaN3.

1 x 12 mL

Horse radish peroxidase-Conjugated Probe.

Red coloured. Ready to use. Contains HRP-probe, stabilizer and preservatives.

1 x 12 mL

TMB Substrate Solution
Ready to use. Contains TMB

1 x 12 mL

TMB Stop Solution
Ready to use. 1N HCl

1 x 50 mL

Wash Buffer concentrate (20x)
Contains Buffer with Tween 20.

2 x 1

Adhesive Foil
For covering of Microtiter Plate during incubation.

2 x 1

Semi-Log Graph Paper
For constructing standard curve and calculation of results.

Infliximab ELISA Protocol

Steps Protocol


Pipette 100µl of Assay Buffer non-exceptionally into each of the wells to be used.


Pipette 10 µL of each ready-to use Standards, High Level Control, Low Level Control and Diluted Samples into the respective wells of microtiter plate.
A1: Standard A
B1: Standard B
C1: Standard C
D1: Standard D
E1: Standard E
F1: High Level Control
G1: Low Level Control
H1 and on: Sample (Serum / Plasma) A


Cover the plate with adhesive foil. Incubate 30 min at room temperature (18- 25°C).


Remove adhesive foil. Discard incubation solution. Wash plate 3 times each with 300µL of diluted. Wash Buffer. Remove excess solution by tapping the inverted plate on a paper towel.


Pipette 100 µL of ready-to use HRP-Conjugated Probe into each well.


Cover the plate with adhesive foil. Incubate 30 min at room temperature (18- 25°C).


Remove adhesive foil. Discard incubation solution. Wash plate 3 times each with 300 µL of diluted Wash Buffer. Remove excess solution by tapping the inverted plate on a paper towel.


Pipette 100 µL of TMB Substrate Solution into each well.


Incubate 10 min (without adhesive foil) at room temperature (18-25°C) in the dark


Stop the substrate reaction by adding 100 µL of Stop Solution into each well. Briefly mix contents by gently shaking the plate. Colour changes from blue to yellow.


Measure optical density with a photometer at 450/650 nm within 30 min after pipetting of the Stop Solution.


REMSIMA is a trademark of CELLTRION, INC.