WesternBright Quantum - HRP Substrate – Witec AG

Art No | K-12042
from 98.00 CHF

WesternBright Quantum chemiluminescent substrate sets the bar for sensitivity and quantitative ability.


Specially developed for CCD imaging, WesternBright Quantum produces a strong, long-lasting signal with extremely low background, perfect for detecting low abundance proteins. Since it does not exhibit substrate depletion at high protein loads, WesternBright Quantum provides the largest dynamic range of any chemiluminescent substrate for the most quantitative chemiluminescent Western experiments.

Quantum is formulated to take full advantage of the linear dynamic range of CCD imagers.

It provides high sensitivity to detect low abundance proteins, and does not exhibit substrate depletion with high abundance proteins, so has a larger linear dynamic range than other commercially available substrates.

A signal linear with respect to protein concentration over 3 orders of magnitude provides the ability to accurately quantify and compare protein amounts in your samples.

WesternBright Quantum sets the bar for both sensitivity and quantitative ability.

  • Sensitive – detect attomoles of protein per band
  • Quantitative – linear range of signal with respect to protein amount exceeds 3 orders of magnitude
  • Versatile – Optimized for CCD imaging, and compatible with film detection. Chemifluorescent emissions can be detected with fluorescence imaging systems
  • Low background – for high signal to noise ratio
  • Long lasting signal – image blots hours after substrate incubation


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WesternBright Quantum



WesternBright Quantum exhibits high sensitivity with the greatest linear range.

Identical Western blots containing serial dilutions of transferrin were probed with a rabbit-anti-transferrin primary antibody and a goat-anti-rabbit secondary antibody conjugated to HRP. The blots were incubated with chemiluminescent substrates as recommended by each manufacturer. All blots were imaged simultaneously for 2 min on a CCD imager and display parameters were identical across all images. Band intensities were plotted and a best fit linear regression conducted for each substrate. WesternBright Quantum shows the largest linear dynamic range out of all four substrates with the highest R2 value. Bands that fall on the linear part of the curve for each substrate are indicated in the image.

WesternBright Quantum



WesternBright Quantum produces the most stable chemiluminescent signal.

Blots detected using WesternBright Quantum or one of three other chemiluminescent substrates were re-imaged at several times over a 10 hr period. The intensitiy of one band is plotted 60 min after substrate incubation, WesternBright Quantum retains 70% of its initial signal strength, while the competition decays to 5% or less.

WesternBright Quantum



High sensitivity for quantitative detection of low-abundance proteins.

WesternBright Quantum provides the highest sensitivity and broadest linear dynamic range. Serial dilutions of A431 cell lysates were blotted and probed to detect STAT-1 protein. The blots were detected with WesternBright Quantum or two other chemiluminescent substrates (ECL and ECL Plus, GE Healthcare). Only data points on the linear portion of the best-fit curve for each substrate shown. All display parameters were identical across all images in this figure.

WesternBright Quantum

No need to rush to image your Western blot.

WesternBright Quantum allows blots to be imaged several hours after substrate incubation. Blots can be re-imaged to obtain the perfect exposure, without worrying about losing signal. A blot was imaged with 2 min exposures at 5 min, 60 min and 10 hours after substrate incubation. The same band is clearly seen in each image, even after 10 hours.


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