Chemiluminescent immunoassays (CLIAs) are among the most sensitive and widely deployed diagnostic platforms globally. The bioconjugation chemistry used to prepare magnetic particle reagents used in these assays has a direct impact on performance, cost, and development speed.
Tosyl-activated magnetic particles remain a standard approach, but their covalent, randomly oriented conjugation process demands high antibody loads, lengthy incubation times, and controlled temperature environments.
This comparative study presents head-to-head performance data from CLIA experiments using Tosyl-activated particles versus a next-generation noncovalent surface activation approach, across four clinically relevant antibodies.
Download this whitepaper to learn:
- How the noncovalent approach achieved equivalent or superior CLIA signal-to-blank performance using up to six times less antibody than Tosyl-activated particles
- Why switching to room-temperature activation and a 2–3 hour total processing time change assays development economics
- What the data show across four antibody targets, including dynamic range evaluations and direct side-by-side plate comparisons
1
AnteoBind™ NXT, the latest product in the AnteoBind™
product range, is a molecule-to-molecule cross-linker
designed to facilitate strong and specific attachment
of biomolecules to synthetic surfaces.
Biomolecules including proteins, nucleic acids,
carbohydrates and lipids are the fundamental building
blocks of living organisms and preform essential biological
functions. The process of attaching these biomolecules
to a surface, such as a magnetic particle, is known as
bioconjugation.
Bioconjugation represents a foundational step in the
development of a chemiluminescent immunoassay
(CLIAs). In modern pathology (clinical laboratory medicine),
the majority of high-throughput automated immunoassay
testing is conducted on CLIA platforms, with billions of
diagnostic tests performed globally every year.
Unlike dominant bioconjugation chemistries used in In
Vitro Diagnostic (IVD) immunoassay development, such as
EDC/sNHS or Tosyl activation, AnteoBind™ NXT facilitates
noncovalent bioconjugation of biomolecules by activating
synthetic surfaces creating a better performing, lower total
cost of usage, faster turnaround and more user-friendly
alternative to traditional covalent chemistries.
In this paper, we present the performance benefits
achieved using AnteoBind™ NXT- activated magnetic
particles in CLIA, compared with widely used Tosylactivated
magnetic particles.
Executive Summary
AnteoBind™ NXT VS Tosyl-Activated Magnetic Particles
Enhancing CLIA Performance
A Comparative Study
Further information regarding nano- and microparticle-based assay applications and bioseparation
using AnteoBind™ NXT is available at: https://anteotech.com/life-sciences/products/.
Faster Turnaround, Simpler Workflow and Improved User Experience
Unlike Tosyl activation, which may require controlled temperature environments and harsher processing
conditions, AnteoBind™ NXT activation can be performed at room temperature. This simplified workflow
enhances laboratory usability and contributes to reduced operational cost and faster assay
development cycles.
Improved Performance
AnteoBind™ NXT demonstrated improved CLIA specific signal-to-blank sensitivity of up to 1.8 times (x),
for IL-6, IFN-γ and TNF-α, measured using Relative Luminescence Units (RLU), when compared with Tosylactivated
magnetic particles.
The key benefits observed when using AnteoBind™ NXT- activated magnetic particles in CLIA, for the
antibodies tested, can be summarised as follows:
Lower Total Cost of Use
a) Reduced Antibody
Requirements
AnteoBind™ NXT required
between 1.5 to 6.0 x for lower
IL-6, TNF-α and IFN-γ antibody
quantities to produce magnetic
particles that delivered
equivalent or improved
CLIA performance compared
with Tosyl-activated
magnetic particles.
b) Reduced Bioconjugation
Times and Associated Costs
AnteoBind™ NXT activation
and bioconjugation processes
are up to 10x faster than those
using Tosyl-activated magnetic
particles. Faster bioconjugation
leads to significant reductions in
labour costs which is appealing to
researchers, product developers
and other end users by reducing
assay turnaround time.
c) Reduced Testing Costs
AnteoBind™ NXT activation
and bioconjugation reduces
overall test costs through
lower antibody and reagent
consumption, supporting more
cost-efficient and sustainable
assay development.
2
Introduction
Bioconjugation is the process of combining two or more molecules, where at least one component is a biomolecule
(e.g. antibodies, nucleic acid, carbohydrate or polymer). A wide range of entities may be conjugated to biomolecules,
including other biological molecules (e.g. peptides), small or large synthetic molecules (e.g., drugs or polymers),
particulates or surfaces (e.g. nanoparticles or patterned surfaces).
Such bioconjugates retain the favourable characteristics or properties of their individual components but also acquire
enhanced capabilities through their combination.1 Historically, both covalent and noncovalent coupling chemistries
have been used to synthesise bioconjugates, supporting a broad range of biotechnology and translational medicine
applications including diagnostics, biosensors, detection probes, affinity chromatography, and immunoassays such as
chemiluminescent immunoassays (CLIA).
Figure 1. Schematic representation of AnteoBind™ surface “activation” illustrating the facilitation of bioconjugation between
synthetic surfaces (represented by carboxylic acid groups) and biomolecules (e.g. antibodies/proteins) via coordination bonds.
Amino acid COOH Layer
(-ve surface charge)
AnteoBind™ layer
(+ve surface charge)
Antibody/Protein
AnteoBind™
Polymeric metal
ion complex
Dative Bond
Metal ion
Microsphere/Surface
Bare COOH layer
(-ve surface charge)
Illustration of the carboxylic groups
HOW ANTEOBIND™ WORKS
1 https://www.sciencedirect.com/book/monograph/9780123822390/bioconjugate-techniques?via=ihub%3D
2 https://cdn2.hubspot.net/hub/213437/file-2210845694-pdf/docs/SEPMAG-Magnetic-Particles-Coatings-Today-and-Tomorrow.pdf
CLIA is widely regarded as one of the most sensitive
conventional methods used in immunological diagnostics
and is extensively implemented in automated pathology
analysers worldwide. CLIA platforms offer:
High analytical sensitivity
Low background noise
Broad linearity (CLIA is known for its ability
to produce a directly proportional signal over
a wide range of analyte concentrations)
Rapid turnaround times
Elimination of radioactive reagents and
associated handling and disposal requirements
User friendliness
Magnetic particles, one of the most widely used solid
phases in CLIA, serve as a critical solid substrate in
automated analysers, enabling seamless diagnostic
automation. Beyond this, they bring a host of advantages
that enhance modern assay performance:
High surface area for efficient reactions
Low toxicity
Strong compatibility with biological materials
Efficient magnetic separation from complex sample
matrices
Cost-effective synthesis and scalability2
These magnetic particles conjugate specific antibodies.
Traditional bioconjugation chemistries used for this
3
purpose include EDC/sNHS, Tosyl and epoxy-based
activation methods.
Tosyl-activated magnetic particles are typically grafted
with Tosyl (p-toluenesulfonyl) groups that are used
to create covalent bonds with biomolecules, such as
antibodies, proteins, peptides, and glycoproteins, which
all possess primary amino (-NH₂) or sulfhydryl (-SH)
groups. Tosyl-activated magnetic particles do not
require activation and can be used as supplied from the
manufacturer or supplier to conjugate biomolecules in a
straightforward manner by incubating in the correct buffer
at the optimal pH and temperature.
Incubation duration depends on the temperature used,
with most incubations performed overnight at 370C,
incubations at lower temperatures may require up to 48
hrs.3 Bioconjugation of antibodies to Tosyl-activated
magnetic particles occurs via nucleophilic substitution
and results in largely random antibody orientation.
Consequently, a proportion of the antibodies may not be
bound to the solid phase with an orientation that allows
them to bind their corresponding antigen.
Figure 2. illustrates the fundamental CLIA workflow.
AnteoBind™ NXT-activated magnetic particles preferentially bind to the cysteine rich Fc portion of antibodies
(as shown in Figure 3), leaving the antigen-binding Fab arms free to bind their antigen.
As a result, fewer antibodies (up to six times less as in the case of IL-6 shown below) may be required on the particles
surface to get the same number of antibody/antigen binding interactions, for a test with the same sensitivity.
Alternatively, within steric constraints, it is possible to create a test with a higher sensitivity.
3 https://www.sciencedirect.com/science/article/pii/S2405580817302480#:~:text=Currently%2C%20chemiluminescence%20immunoassay%20(CLIA),time%20
and%20easy%20to%20automate
Figure 2. CLIA Analysis Steps
CAPTURE
Magnetic
Particles
Target Antigen bind to
Capture Antibody on
Magnetic Particles
1
Detection Antibody with
Chemiluminescent Label
binds to Antigen
Labeled
Detection
Antibody
Chemiluminescent
Label
2 DETECTION
Add
Substrate
Substrate reacts,
emitting Light Signal
3 SIGNAL
CHEMILUMINESCENT IMMOUNOASSAY (CLIA)
Measuring
Light Signal
Figure 3.
Illustration of
antibody structure
highlighting how
AnteoBind™ NXT
coated surfaces
allow for improved
orientation of
antibodies. Source:
Company data,
January 2026 ©
AnteoTech Ltd.
4
4 https://documents.thermofisher.com/TFS-Assets/LSG/manuals/dynaparticles_m280tosylactivated_man.pdf
5 https://anteotech.com/wp-content/uploads/2025/05/IFU-12-V3.1-NXT_IFU-Nano-Microparticles-FINAL.pdf
In this study, AnteoTech compared the performance of
AnteoBind™ NXT-activated magnetic particles with Tosylactivated
magnetic particles. All magnetic particles
were sourced from commercial suppliers and were of
comparable size and surface characteristics.
Tumour Necrosis Factor Alpha (TNF-α), Granulocyte-
Macrophage Colony-Stimulating Factor (GM-CSF),
Interferon Gamma (IFN-γ) and Interleukin-6 (IL-6) were
selected as representative antibodies for CLIA evaluation.
The antibodies for these analytes were bioconjugated
to magnetic particles using either the ThermoFisher
Scientific protocol4 for Tosyl-activated particles or the
AnteoBind™ NXT Instructions for Use (IFU).5
Any modifications to the protocol that were made
for a specific analyte are set out in the specific section
for that analyte in this report.
Magnetic particles were conjugated with each antibody
across a series of increasing loading concentrations
to evaluate the impact of antibody density on assay
performance, including sensitivity and specificity
determined by signal and background intensity. Following
bioconjugation, particles were washed and resuspended
under standardised buffered conditions to ensure overall
comparability between conjugation chemistries.
CLIA performance was evaluated using standard
analytical industry metrics, including Relative
Luminescence Units (RLU) and signal-to-blank (S/B)
ratios, along with consistency across replicates,
with tests repeated for reproducibility.
The resulting data, confirmed after multiple repeats
of each experiment, enabled identification of optimal
antibody loading ranges for each conjugation chemistry.
These optimised conditions were subsequently evaluated
side-by-side on the same assay plate to eliminate interplate
variability and allow direct comparison of functional
performance achieved with AnteoBind™ NXT-activated
magnetic particles versus Tosyl-activated
magnetic particles.
Method
IL-6 antigen
concentration
Tosyl 15 μg/mg Tosyl 2.5 μg/mg AnteoBind™ NXT 2.5 μg/mg
Average RLU CV%* Average RLU CV%* Average RLU CV%*
500 pg/mL 6591856 13% 1390085 3% 6566032 2%
125 pg/mL 1683670 5% 325379 4% 1599822 6%
31.25 pg/mL 380105 1% 76058 7% 348583 7%
0 pg/mL 20113 28% 6862 4% 4641 39%
Table 1. Average RLU signals obtained for IL-6 CLIA from 15 μg/mg down to 2.5 μg/mg.
*CV% (Coefficient of Variation Percentage) is a statistical measure that describes the variability of a dataset relative to its mean. It demonstrates
how consistent assay results are, with lower values indicating more reliable and reproducible measurements. High CV% can occur in blank
samples as blank samples are inherently variable and the RLU signals are comparatively lower than specific signals.
Results
IL-6
Table 1 summarises the average Relative Luminescence
Unit (RLU) signals and associated replicate variability
(CV%) for Tosyl-activated and AnteoBind™ NXT-activated
particles, highlighting differences in assay sensitivity.
Figure 4. further compares the two activation methods
by presenting signal-to-blank (S/B) ratios, emphasising
relative assay specificity under each condition.
For the IL-6 CLIA, magnetic particles activated with
AnteoBind™ NXT and conjugated at an antibody
concentration of 2.5 μg/mg generated significantly higher
raw signal and lower background (non-specific
signal) compared with Tosyl-activated magnetic particles
conjugated at the same antibody concentration.
Notably, the signal generated using AnteoBind™ NXT at
15 μg/mg was comparable to that of the Tosyl-activated
magnetic particles, indicating that AnteoBind™ NXT
requires as much as six times (6x) less antibodies to
achieve the same results. Higher RLU values produce
a stronger detectable signal, while improving S/B
ratios ensures that true positive results are clearly
distinguishable from background noise.
5
Figure 4. IL-6 CLIA
– S/B ratios of the
respective activation
methods against the
two antibody loadings.
0
200
400
600
800
1000
1200
1400
1600
Signal:Blank Ratio
Tosyl 15 μg/mg
Tosyl 2.5 μg/mg
AnteoBind™
NXT 2.5 μg/mg
Tosyl 15 μg/mg
Tosyl 10 μg/mg
AnteoBind™
NXT 10 μg/mg
IL-6 Antigen (pg/mL)
Detection of IL-6 Antibody with CLIA
TNF-α
Table 2 presents the average Relative Luminescence Unit
(RLU) signals and replicate variability (CV%) for Tosylactivated
and AnteoBind™ NXT-activated TNF-α magnetic
particles, highlighting differences in assay sensitivity.
Figure 5. further compares the two activation methods
by presenting signal-to-blank (S/B) ratios, illustrating the
specificity of the two particle types.
AnteoBind™ NXT- activated conjugates with 10 μg/mg
TNF-α antibody exhibited improved S/B ratios (1.8 times)
relative to Tosyl-activated magnetic particles, supporting
enhanced assay specificity and discrimination.
Table 2. Average RLU signals obtained for TNF-α CLIA at 15 μg/mg down to 10 μg/mg.
TNF-α antigen
concentration
Tosyl 15 μg/mg Tosyl 10 μg/mg AnteoBind™ NXT 10 μg/mg
Average RLU CV% Average RLU CV% Average RLU CV%
2000 pg/mL 10136516 4% 10689816 3% 9037845 7%
500 pg/mL 2952866 8% 3159600 2% 2705421 3%
125 pg/mL 685331 24% 802173 2% 622452 2%
0 pg/mL 29085 5% 18053 4% 8150 20%
TNF-α Antigen (pg/mL)
Figure 5. TNF-α
CLIA – S/B ratios
of the respective
activation methods
against the two
antibody loadings.
Detection of TNF-α Antibody with CLIA
0
200
400
600
800
1000
1200
2000 0
Signal:Blank Ratio
500 125
500 125 31.25 0
6
IFN-γ
Table 3 presents the average Relative Luminescence
Unit (RLU) signals and replicate variability for Tosylactivated
and AnteoBind™ NXT IFN-γ magnetic particles,
highlighting differences in assay sensitivity. Figure 6.
presents the corresponding signal-to-blank (S/B)
ratios, illustrating relative assay specificity across
activation methods.
AnteoBind™ NXT-activated magnetic particles conjugated
with 10 μg/mg of IFN-γ yielded significantly higher RLU
(up to 3 times more) values and double the S/B ratios
across all antigen concentrations compared to the Tosylactivated
magnetic particles (excluding the blank).
Detection of IFN-y Antibody with CLIA
Table 3. Average signals obtained for IFN-γ CLIA at 20 μg/mg, down to 10 μg/mg.
IFN-γ antigen
concentration
Tosyl 20 μg/mg Tosyl 10 μg/mg AnteoBind™ NXT 10 μg/mg
Average RLU CV% Average RLU CV% Average RLU CV%
500 pg/mL 231071 2% 228267 3% 706945 12%
125 pg/mL 44180 3% 47043 4% 164441 12%
31.25 pg/mL 1273 10% 1503 24% 4874 13%
0 pg/mL 373 14% 379.7 17% 553 29%
Figure 6. IFN-γ CLIA
– S/B ratios of the
respective activation
methods against
the two antibody
loadings.
IFN-y Antigen (pg/mL)
0
200
400
600
800
1000
1200
1400
Signal:Blank Ratio
Tosyl 20 μg/mg
Tosyl 10 μg/mg
AnteoBind™
NXT 10 μg/mg
GM-CSF
The average Relative Luminescence Unit (RLU) signals
and replicate variability (CV%) for Tosyl-activated and
AnteoBind™ NXT-activated IFN-γ magnetic particles are
summarised in Tables 4 and 5, highlighting differences in
assay sensitivity. Figure 7. compares the two activation
methods by presenting S/B ratios, illustrating relative
specificity.
AnteoBind™ NXT-activated magnetic particles conjugated
with 15, 10 and 5 μg/mg GM-CSF yielded significantly
lower RLU values compared with Tosyl-activated magnetic
particles conjugated at 10 μg/mg and 20 μg/mg under the
tested conditions.
However, across all three antibody concentrations
evaluated, AnteoBind™ NXT-activated particles
demonstrated improved specificity, as reflected by higher
S/B ratios relative to Tosyl-activated magnetic particles
due to the greater difference in blank readings (as much
as three to eight times lower for the AnteoBind™ NXTactivated
magnetic particles).
500 125 31.25
7
Table 4. Average signals obtained for GM-CSF CLIA at 15, 10 and 5 μg/mg for Tosyl-activated particles.
GM-CSF
antigen
concentration
Tosyl 15 μg/mg Tosyl 10 μg/mg Tosyl 5 μg/mg
Average RLU CV% Average RLU CV% Average RLU CV%
500 pg/mL 6692252 4% 5429604 4% 3167751 3%
125 pg/mL 2075313 15% 1618933 15% 848385 1%
31.25 pg/mL 505392 7% 394266 7% 202206 4%
0 pg/mL 7216 3% 11374 3% 6842 4%
GM-CSF
Antigen
Concentration
AnteoBind™ NXT 15 μg/mg AnteoBind™ NXT 10 μg/mg AnteoBind™ NXT 5 μg/mg
Average RLU CV% Average RLU CV% Average RLU CV%
500 pg/mL 3258173 2% 2915503 1% 2186873 7%
125 pg/mL 767904 6% 781695 5% 477681 7%
31.25 pg/mL 181006 9% 170034.7 3% 112857 3%
0 pg/mL 1960 21% 1560 11% 1166 13%
Table 5. Average signals obtained for GM-CSF CLIA at 15, 10 and 5 μg/mg for AnteoBind™ NXT-activated magnetic particles.
GM-CSF appears to generate lower CLIA signal intensity
and background noise on metal-complex surfaces,
consistent with previous comparisons between
AnteoBind™ NXT- and EDC-based conjugation methods 6.
Dynamic Range Evaluation
A dynamic range evaluation was conducted to compare
the performance of Tosyl-activated and AnteoBind™
NXT-activated magnetic particles across relevant analyte
concentrations. The study assessed assay detection levels
(RLU), signal linearity and signal-to-background (S/B)
characteristics associated with each surface chemistry
under equivalent assay conditions.
6 AnteoBind Technology White Paper, AnteoTech, 2025
IL-6
Dynamic range testing of Tosyl-activated and AnteoBind™
NXT-activated IL-6 magnetic particles revealed differences
in assay sensitivity and reproducibility. Table 6 presents
the average RLU as trends observed across
the IL-6 dynamic range in the CLIA, comparing the
performance of the two different activation methods.
Magnetic particles activated and conjugated using
AnteoBind™ NXT demonstrated improved reproducibility
across the tested range.
The IL-6 dynamic range study further showed that
magnetic particles activated with AnteoBind™ NXT and
conjugated at 2.5 μg/mg generated higher raw signal
intensity and lower S/B at higher antigen concentrations
compared with Tosyl-activated magnetic particles
conjugated at 15 μg/mg.
Detection of GM-CSF with CLIA
Tosyl 15 μg/mg
Tosyl 10 μg/mg
Tosyl 5 μg/mg
AnteoBind™ NXT 15 μg/mg
AnteoBind™ NXT 10 μg/mg
AnteoBind™ NXT 5 μg/mg
GM-CSF Antigen (pg/mL)
Figure 7. GM-CSF CLIA –
S/B ratios of the respective
activation methods against
the three antibody loadings.
0
200
2000
1800
1600
1400
1200
1000
800
600
400
Signal:Blank Ratio
500 125 31.25 0
8
Table 6. Average signals obtained for IL-6 dynamic range CLIA at 15 μg/mg for Tosyl-activated magnetic particles and 2.5 μg/mg for
AnteoBind™ NXT Activated Magnetic particles.
IL-6 antigen
concentration
Tosyl 15 μg/mg AnteoBind™ NXT 2.5 μg/mg
Average RLU CV% Average RLU CV%
10 000 pg/mL 12,719,166 6.6% 15,933,840 2.5%
1000 pg/mL 8,802,592 1.7% 4,391,683 2.8%
100 pg/mL 991,039 2.5% 380,852 6.9%
10 pg/mL 72,948 2.9% 25,178 8.2%
1 pg/mL 6,996 9.6% 2,527 17.0%
0.1 pg/mL 2,770 11.4% 1,049 5.4%
0.01 pg/mL 2,287 6.0% 973 14.2%
0 pg/mL 1,866 4.6% 696 8.9%
TNF-α
Table 7 reports the average Relative Luminescence Unit
(RLU) signals and replicate variability (CV%) observed
in the dynamic range evaluation of Tosyl-activated and
AnteoBind™ NXT-activated TNF-α magnetic particles,
highlighting differences in assay sensitivity. Figure 7.
presents the corresponding RLU trends across the TNF-α
dynamic range in the CLIA, comparing the two activation
chemistries.
Consistent with the IL-6 results, AnteoBind™ NXT-activated
magnetic particles demonstrated improved reproducibility
across the tested concentration range, as reflected by
lower replicate variability.
The TNF-α dynamic range study showed that magnetic
particles activated with AnteoBind™ NXT and conjugated
at 10 μg/mg antibody generated comparable raw signal
intensity to Tosyl-activated magnetic particles conjugated
at the same antibody concentration. Under the tested
conditions, reduced background signal was observed with
AnteoBind™ NXT activation.
Figure 8.
IL-6 Dynamic Range
CLIA – Average RLU
trends for the two
activation methods
Detection of IL-6 Antibody Dynamic Range
IL-6 Concentration (pg/mL)
Tosyl 15 μg/mg
Linear (Tosyl 15 μg/mg)
AnteoBind™ NXT
2.5 μg/mg
Linear (AnteoBind™
NXT 2.5 μg/mg)
9
Table 7. Average signal obtained for TNF-α dynamic range CLIA at 10 μg/mg for Tosyl-activated magnetic particles and AnteoBind™ NXT
Activated Magnetic particles.
TNF-α antigen
concentration
Tosyl 10 μg/mg AnteoBind™ NXT 10 μg/mg
Average RLU CV% Average RLU CV%
20 000 pg/mL 10921022 17% 9764171 15%
2000 pg/mL 6703215 11% 6699790 8%
200 pg/mL 1153371 21% 1002234 5%
20 pg/mL 199572 131% 79931 5%
2 pg/mL 17903 5% 12334 36%
0.2 pg/mL 11323 6% 5992 24%
0.02 pg/mL 10462 10% 4677 23%
0 pg/mL 13936 19% 5074 11%
Figure 9. TNF-α
Dynamic Range CLIA
– Average RLU trends
for the two activation
methods
Operational Differences
Magnetic particle activation with AnteoBind™ NXT offers a faster, more flexible and resource-efficient alternative to
conventional Tosyl-activated and epoxy chemistries for magnetic particles bioconjugation. For the antibodies tested,
AnteoBind™ NXT enabled up to six-fold reductions in antibody usage and reduced total activation and conjugation time
by a factor of 10.
Reduced Activation and Bioconjugation Costs
Reductions in processing time, antibody
consumption and procedural steps contribute
to lower labour and reagent costs, supporting
more cost-efficient assay development.
The streamlined activation and bioconjugation workflow reduces process complexity and supports:
Detection of TNF-α Antibody Dynamic Range
TNF-α Concentration (pg/mL)
Tosyl 10 μg/mg
Linear (Tosyl 10 μg/mg)
AnteoBind™ NXT
10 μg/mg
Linear (AnteoBind™
NXT 10 μg/mg)
Simpler Workflow
AnteoBind™ NXT activation and bioconjugation
workflows are performed at room temperature
and do not require special environmental
conditions.
10
Reduced Activation and Bioconjugation Times
AnteoBind™ NXT reduced total activation and conjugation time from approximately 20–22 hours
(typical for Tosyl-based conjugation) to 2–3 hours under the tested conditions. Shorter processing
times improve throughput and reduce development timelines for immunoassay researchers and product
developers. Extended incubation periods, as required in some tosyl-based protocols, may also increase
the risk of protein denaturation.
Table 8. Comparison of the activation and conjugation operational characteristics between AnteoBind™ NXT and Tosyl-activated magnetic particles.
Process Characteristic Tosyl-activation AnteoBind™ NXT activation
Total Activation and Coupling Time 20-22 hours 2-3 hours
Coupling Temperature 37°C Room temperature
Antibody Usage High Low
Shipping Requirements Ambient Ambient
Product Storage Requirements 2°C to 8°C 2°C to 8°C
Key Findings
Chemiluminescent immunoassays were performed using multiple antibodies to compare bioconjugation on Tosylactivated
magnetic particles with magnetic particles activated using AnteoBind™ NXT. AnteoBind™ NXT preferentially
binds the Fc region of the antibodies that allows for the Fab region to be available for binding, this orientation of the
antibody enables lower antibody usage and better sensitivity in immunoassays, as was seen in these experiments
completed. For the antibodies evaluated, the results indicate:
Improved Performance
AnteoBind™ NXT demonstrated improved CLIA S/B performance for IL-6, IFN-γ, and up to 1.8x for
TNF-α (using RLU) for magnetic particles activated using AnteoBind™ NXT relative to Tosyl-activated
magnetic particles.
Faster Turnaround, Simpler Workflow and Improved User Experience
Unlike Tosyl activation, which may require controlled temperature environments and harsher
processing conditions, AnteoBind™ NXT activation can be performed at room temperature. This simplified
workflow enhances laboratory usability and contributes to reduced operational cost and faster assay
development cycles.
Lower Total Cost of Use
a) Reduced Antibody
Requirements
AnteoBind™ NXT required
between 1.5 to 6.0x lower
IL-6, IFN-γ and TNF-α antibody
quantities to produce magnetic
particles that delivered
equivalent or improved CLIA
performance compared with
Tosyl-activated magnetic
particles.
b) Reduced Activation and
Bioconjugation Time
AnteoBind™ NXT activation and
bioconjugation processes were
10x faster than Tosyl-activated
magnetic particle processes.
Reduced processing time
supports lower labour input,
improved assay turnaround
and enhanced development
efficiency.
c)Reduced Material Usage
Lower antibody and reagent
requirements contribute to
reduced material consumption,
supporting more cost-efficient
and sustainable assay
development.
11
For further information regarding AnteoBind™ NXT, including
prices and delivery timeframes by volume, please contact:
Dr Gautam Rishi
AnteoTech Limited
Phone: +61 (0) 7 3219 0085
Email: sales@anteotech.com