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Your Complete Protein Analysis Solution

Jess automates traditional Western blotting while maximizing multiplexing with multiple detection channels. Automation of protein separation and immunodetection eliminates many of the tedious, error-prone steps of traditional Western blotting which limit data quality. Just load your samples and reagents into the microplate and Jess separates your proteins by size, and precisely manages antibody additions, incubations, washes and even the detection steps. Come back to fully analyzed western blotting results on 24 samples in 3 hours. Go further with high sensitivity multiplexing—her best-in-class fluorescent detection channels and RePlexing capabilities get you all the information you need on your samples in one run. Jess automated western blot system—she's like multiplexed Western blot meets ELISA in one.

Jess - Automated Western blot meets ELISA in one

Market leading fluorescence sensitivity:
Stellar NIR / IR Modules for Jess

Stellar Modules for Jess – Highest Sensitivity Fluorescence Multiplexing for Western Blotting Workflows

Stellar NIR / IR modules for Jess set the standard for fluorescence Western blotting detection sensitivity. With Stellar modules, low abundance proteins can be detected and multiple targets can be multiplexed in the same sample using multi-color fluorescence channels. Plus, use the Stellar Total Protein assay to normalize your multiplexed results to total protein abundance within the same lane.

Stellar - Industry-leading sensitive fluorescent automated Western blot using Jess systems


Learn more about the benefits of Stellar NIR / IR modules and see how they compare to other detection methods.

  Jess with Chemiluminescence Jess with Steller NIR Jess with Stellar IR Competing Fluorescence Western Blotting Technology
LOD of RNase A 1.1 pg 0.4 pg 0.7 pg > 50 pg

LOD Comparison of Stellar NIR / IR, Chemiluminescence, and Leading Competitor for Fluorescence Western Blotting using RNase A as the target (Learn more).



How Can Jess Help You?

I want high sensitivity protein detection

Jess offers market-leading protein detection sensitivity for Western blotting workflows. Choose between chemiluminescence detection or fluorescence detection with Stellar NIR / IR modules, all while detecting your protein targets with low pg sensitivity.

High sensitivity protein detection with Stellar on Jess.

I need fast results

With Jess, a western blot is as simple as pipette, run, and done! All assay steps from protein separation, immunoprobing, detection and analysis of data are fully automated. With just 30 minutes of experimental setup and 3 hours of hands-free run time, you can be analyzing data for your next publication or grant.

Automated Simple Western with Jess is as easy as pipette, run, and done

I want to boost my throughput

Got a lot of samples? Jess can dramatically increase your throughput compared to traditional western blots. She automates the protein separation and immunodetection of traditional Western blotting, giving you fully analyzed results in just 3 hours. Everything happens inside a capillary, and Jess precisely controls the protein separation, reagent additions, incubations and detection steps. Use Jess's fluorescent capabilities and RePlexing workflow to multiplex your proteins for even higher throughput. With her 13 and 25 sample capillary cartridges, you'll get the throughput you need with minimum hands-on time.

Boost throughput from traditional western blotting by doing Simple Western on Jess

I want immunoassay-like quantitation from my Western blots

Stop, analyze and wow! With Jess, protein quantitation is a breeze. At the conclusion of your run, use the lane view option to compare band intensities or dive deeper for fully quantitative western blotting analysis of protein size and concentration. With a few clicks you'll be analyzing immunoassay-like standard curves and precisely quantifying your protein. Multiplexing takes your options to the max, helping you identify and differentiate relative protein expression between samples in one shot. And with in-built protein normalization, you'll have the confidence you need in your results, experiment after experiment.

Quantitate your protein with Jess's automated western capabilities using Simple Western

Run two immunoassays with RePlex on Jess

I need to replace my stripping & reprobing protocol

The RePlex feature on Jess enables you to run two immunoassays within the same capillary to get more rich protein characterization data from just one sample. Quantify expressed phosphorylated target and total target levels. Normalize your data with total protein expression data in the same capillary. Save time and money on consumables.

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Jess provides PN, FLIR, FL-NIR, HRP, and chemiluminescent detection at the same time to provide multiplexing capabilities

PN, IR NIR and chemiluminescent detection at the same time

Until now, multiplexing Western blots was the only way to go—but we all know the roadblocks that come with it. Superplexing and RePlexing let you keep everything you like about multiplexing now and eliminate what you don't. When you Superplex with Jess, you've got one chemiluminescence and two fluorescence (NIR and IR) channels to detect protein targets in your Western blot tests. You'll also never have to give one up to run total protein because that happens on a totally different channel. With RePlex, you can run two sequential immunoassays within the same capillary to get even more datapoints from your sample.

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Protein normalization using Jess Automated Western Blot System

I need to do total protein normalization

Total protein detection happens in the same capillary on the same sample as your immunoassay(s) so you can get more reliable normalized immunoassay data than is possible using housekeeping proteins. Total protein normalization runs on a separate channel from NIR or can be done using RePlex sequential assays so you get to keep your existing IR, NIR and chemiluminescence channels. Jess's automated western blotting workflow offers same-time detection of multiple proteins per lane and provides more consistent and reliable results than traditional Western blot assays without having to stain and wash a single Western blot!

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I want more data per sample

Do traditional assays use too much of your precious samples or require you to pool your samples? Jess gets you down to picogram-level sensitivity with just 3 µL of starting material. Tired of stripping and reprobing? Jess's RePlexing capability and fluorescence detection channels let you maximize the data you get in one shot. Let your sample go further with Jess.

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Learn how Jess's fluorescent detection gives you more data per assay sample than traditional Western blot methods

Chemiluminescent blot imaging with Jess

I need to run traditional Western blots, sometimes

Still doing traditional Western blots? Snap! Get the picture with the chemiluminescent blot imaging system on Jess.

Simple Western Applications

Cancer &

Simple Western Instrument Cancer Research Applications


Simple Western Instrument SARS-CoV-2 Research Applications

Cell & Gene Therapy

Simple Western Instrument Cell & Gene Therapy Research Applications

C&GT Western Blotting Solutions

Cell & Gene Therapy Western Blotting Solutions


Targeted Protein Degradation

Targeted Degradation

SARS-CoV-2 Serology

SARS-CoV-2 Multi-Antigen Serology Module



Vaccine Development

Vaccines Development





Simple Western assays on Jess are automated, capillary-based immunoassays that solve many of the challenges that come with traditional Western blots. Jess automates Western blotting workflows, integrating all assay steps from protein separation, immunoprobing, detection and analysis of data.

Jess gives you four different ways to analyze proteins, giving you flexibility in your western blotting workflows.

  1. Fluorescent detection: Why bother stripping and reprobing? Maximize your time and sample, and get the information you need in one shot, with market-leading sensitivity for fluorescence multiplexing.
  2. Chemiluminescent detection: Working with low abundance targets or precious samples? Chemiluminescent detection gives you picogram-level sensitivity, letting you maximize the data you get from your sample.
  3. Protein normalization. Jess gives you several easy and robust ways to see if your samples contain a consistent protein load and normalize your immunoassay data to total protein content rather than a loading control. Don't strip & reprobe, RePlex your Jess assay by removing your first set of antibodies and performing a sequential total protein assay in the same capillary. Alternatively, use Jess's fluorescent Protein Normalization assay. Just load her in-capillary protein normalization reagent into her assay plate and she'll take care of the rest. Her proprietary fluorescent reagent measures proteins immobilized in the same capillary as your immunoassay. The result of either approach? You can quickly see if your samples contain a consistent protein load, identify experimental setup and user errors, and effectively normalize expression of your target protein to get accurate and consistent data, giving you the confidence you need in your results. Best of all, Jess's fluorescent detection capabilities enable two-color protein detection for multiplexing on top of protein normalization.
  4. Blot imaging: Still doing traditional western blots? Snap! Get the picture with Jess's in-built blot imaging system.

Simple Western immunoassays take place in a capillary. Your sample, separation matrix, stacking matrix, antibodies and reagents are loaded automatically from a specially designed plate. Jess begins by aspirating the separation matrix and then the stacking matrix into each capillary. Next your sample is loaded, and capillaries are lowered to make contact with running buffer. Voltage is applied to enable separation by molecular weight. Once the separation is complete, UV light immobilizes the proteins to the capillary wall. With proteins now immobilized and the matrix cleared of the capillary, Jess starts the immunoprobing process, first with incubation with the primary antibody, followed by a secondary HRP conjugate, and finally chemiluminescent substrate. The chemiluminescent reaction is recorded by a CCD camera in a series of images over time. In just 3 hours you'll have quantitative, size-based data ready for analysis.

Her fluorescent detection capabilities enable two-color protein detection for multiplexing using classic NIR and IR secondary antibodies or using Stellar high sensitivity fluorescence. During the immunoprobing process samples are incubated with the primary antibody, followed by infrared or near-infrared fluorescent secondary-tagged antibodies. Stellar goes a step further to utilize a proprietary oligo-based amplification chemistry to achieve even higher NIR and IR sensitivity. Excitation of the fluorphores releases photons and the emission spectra is detected by wavelength sensors and recorded by a CCD camera in a series of images over time. In just 3 hours you'll have multiplexed, quantitative, size-based data ready for analysis.

Protein normalization has never been easier with Jess. Jess gives you several easy and robust ways to normalize your immunoassay data to total protein content rather than a loading control. Choose between RePlexing with an immunoassay followed by a sequential total protein assay in the same capillary or Jess's fluorescent Protein Normalization assay or high sensitivity fluorescent Stellar Total Protein Assay. To run her Protein Normalization assay, just load the Protein Normalization Regent into a row of wells on the plate and Jess will take care of the rest. The fluorescent-labeled reagent reacts with amines on proteins, enabling a between capillary comparison of protein load. Use the chemiluminescent Stellar Total Protein Assay alongside Stellar NIR or IR Modules to get even higher sensitivity for your normalized immunoassay data. Best of all, Jess's fluorescent detection capabilities enable two-color protein detection for multiplexing on top of protein normalization. With either approach, now you can effectively normalize target protein expression data, produce accurate and consistent Western blotting data, and mitigate experimental setup and user error.

What does Simple Western data on Jess look like? At the end of your run, use the lane view option to compare band intensity or dive deep for fully quantitative analysis of protein size and concentration. Dive deeper into quantitative analysis to compare protein expression changes and analyze protein isoforms or size changes. Want to analyze expression changes between samples or compare runs? Our protein normalization will give you the confidence you need in your analysis.

Description Total Protein
Chemiluminescence and Stellar Fluorescence Specification Classic Fluorescence Specification Protein Normalization
Sample required 0.3-1.2 µg 0.6-1.2 µg 2-4 µg 2-4 µg
Volume required 3 µL/well
Size range Molecular weight (MW) ladder ranges from 2-440 kDa
Sizing CV <10%
Intra-assay CV <15% <20%
Inter-assay CV <20%* <20%**
Resolution (± percent difference in MW) ± 15-20% for MW <20 kDA
± 10% for MW >20 kDa
Quantitation CV <20% (total protein, chemiluminescence and fluorescence) N/A
Dynamic range 2-3 logs 3-4 logs 1 log
Sensitivity ng Low pg High pg ng
Capillary 5 cm, 100 µm, 400 nL
Runtime <3 hours <4 hours with immunoassay
Samples per run 13 or 25
Weight 23 kg
Dimensions (closed) 0.36 m H X 0.3 m W X 0.57 m D
Dimensions (open) 0.36 m H x 0.53 m W x 0.57 m D
Power US/CAN 120 V AC, 60 hz, 4.2 amps
Europe 240 AC, 50 Hz, 2.1 amps
Japan 100 AC, 50/60 Hz, 5.0 amps
Operating temperature 18-24 °C
Operating humidity 20-60% relative, non-condensing

*inter-assay CV is with system control
**percent peak area