The UltraScence Pico Ultra Western Substrate, as a luminol-based enhanced chemiluminescent substrate, is sensitive and compatible with conducting immunoblots with horseradish peroxidase (HRP) – conjugated secondary antibodies. The low picogram to mid femtogram detection of antigen is enabled by UltraScence Pico Ultra Western Substrate’s excellent sensitivity and long signal duration. Further, its long chemiluminescent signal duration makes both digital and film-based imaging possible without any loss of the signal. Appropriate primary and secondary antibody dilutions are suggested for attaining optimal signal intensity and duration.

Product Name: UltraScence Pico Ultra Western Substrate

Product Item No.: CCH345-B100ML

Dimensions: 100ML

Substrate Type: HRP (Horseradish Peroxidase) Substrate

Contents/Storage: Store at 4℃ for 2 years

**US Patent No.: US10,711,185

- No optimization required. 
Switching to theUltraScence Pico Ultra Western Substrate from other brands, such as Thermo Scientific™ SuperSignal™ West Dura and Millipore™ Immobilon™ substrates, does not require optimization or protocol changes.

- High degree of sensitivity and enhanced chemiluminescence duration. 
UltraScence Pico Ultra Western Substrate enables an accurate low picogram to mid femtogram detection of protein on the same immunoblot after a single exposure.

- Optimized for use with PVDF and nitrocellulose membranes.
- Compatible with Western Blotting Markers.
- Optimized for film- and CCD-based imaging.
- Patent pending product.

**US Patent No.: US10,711,185

1. Keep the membrane moist in the wash buffer while preparing the substrate mixture. Make sure the membrane does not dry out in the next steps.

2. The chemiluminescent substrate solution is sufficiently stirred to prepare the 0.1ml of solution / cm² of the membrane.

　- For a small membrane (7 x 8.5 cm), 4 ml of solution is sufficient.
　- For a medium-sized membrane (8.5 x 13.5 cm), 10 ml of solution is sufficient.

3. Place the membrane on a clean, flat surface or in a clean container.

4. Remove the membrane from the chemiluminescent substrate solution and drain the excess solution.

5. Place the membrane in a plastic sheet protector or plastic wrap to prevent the film from drying out.

6. Imaging the membrane with a digital imager or by exposure to the X-ray film. 

Figure 1. UltraScence Pico Ultra Western Substrate enables an accurate low picogram to mid femtogram detection of protein on the same immunoblot after a single exposure. Membranes were probed with GFP tag Rabbit PolyAb diluted at 1:10,000 of and then with Goat Anti-rabbit IgG/HRP secondary antibody (1:10,000) after serial dilution EGFP (Enhanced Green Fluorescent Protein) were prepared and applied in electrophoresis and protein transfer. Identical blots were incubated with the Western substrate. The blots were simultaneously exposed for 5 seconds, 10 seconds, 30 seconds, 60 seconds, and 180 seconds using ChemluxSPX-600 Series digital imaging system.

*Immobilon™ Western Chemiluminescent HRP Substrate is a registered trademark of Millipore, Amersham ECL™ Prime Western Blotting Detection Reagent is a registered trademark of Cytiva, and SuperSignal West Dura is a registered trademark of Thermo Fisher Scientific. The trademark holder is not affiliated with Bio-HeliX Co., Ltd. and does not endorse these products.

Figure 2. 24-hour signal duration with UltraScence Pico Ultra Western Substrate

The Luminol and Peroxide solution of UltraScence Pico Ultra were mixed in a 1:1 ratio and having 400 uL treated on each blot after taken out from 4℃ for 1hr, 12 hrs and 24 hrs. The blots were simultaneously exposed for 5, 10, 30, 60, and 180 seconds using Chemlux SPX-600 Series digital imaging system. The EGFP (Enhanced Green Fluorescent Protein) was serially diluted for electrophoresis, after the proteins were transferred to the membrane, they were blocked and probed with GFP tag Rabbit PolyAb diluted solution (1:10,000), and followed by the Goat Anti-rabbit IgG/HRP secondary antibody (1:10,000).

Q: From Bio-Helix’s UltraScence ECL substrates portfolio, which level of ECL fits best my Western blot applications?
A: UltraScence ECL substrates series is compatible with the use from low picogram to low-femtogram level detections. Please kindly refer to the ECL selection guide of UltraScence Western substrate as the below table:

(a) CCH321-B100ML, UltraScence Pico Plus Western Substrate
(b) CCH345-B100ML, UltraScence Pico Ultra Western Substrate
(c) CCH365-B100ML, UltraScence Femto ECL Western Substrate

(d) CCH375-B100ML, UltraScence Femto Plus ECL Western Substrate

(e) CCH385-B100ML, UltraScence Atto Western Substrate

References

▋GROZAVU, Ingrid, et al. D154Q mutation does not alter KRAS dimerization. Journal of Molecular Biology, 2022, 434.2: 167392.

▋LYONS, Bronwyn JE, et al. Cryo-EM structure of the EspA filament from enteropathogenic Escherichia coli: revealing the mechanism of effector translocation in the T3SS. Structure, 2021, 29.5: 479-487. e4.

▋MALARD, Camille. Efficacy, safety, and delivery of anti-HIV short-hairpin RNA molecules for use in HIV gene therapy. McGill University (Canada), 2019.