SuperSignal™ West Femto Maximum Sensitivity Substrate
SuperSignal™ West Femto Maximum Sensitivity Substrate
Thermo Scientific™

SuperSignal™ West Femto Maximum Sensitivity Substrate

Thermo Scientific SuperSignal West Femto Maximum Sensitivity Substrate is an ultra-sensitive enhanced chemiluminescent (ECL) substrate for low femtogram protein levelRead more
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Catalog NumberQuantity
34096200 mL
3409420 mL
34095X44 x 100 mL
34095100 mL
34096X44 x 200 mL
Catalog number 34096
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714.00
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Quantity:
200 mL
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Price (USD)
714.00
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Thermo Scientific SuperSignal West Femto Maximum Sensitivity Substrate is an ultra-sensitive enhanced chemiluminescent (ECL) substrate for low femtogram protein level detection by western blot analysis with horseradish peroxidase (HRP) enzyme.

SuperSignal West Femto Maximum Sensitivity Substrate characteristics include:
Sensitivity: low-femtogram (mid-zeptomole)
Stability: 8-hr working solution stability, 1-year kit stability at 4°C
Compatibility: nitrocellulose and PVDF membranes
Signal duration: up to 8 hours
Recommended primary antibody concentration: 1:5,000–1:100,000 dilution (10–200 ng/mL)
Recommended secondary antibody concentration: 1:100,000–1:500,000 dilution (2–10 ng/mL)

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SuperSignal West Femto Maximum Sensitivity Substrate is designed for low femtogram-level detection by western blot analysis. When combined with optimized antibody concentrations and blocking buffers, SuperSignal West Femto substrate enables detection of target proteins in amounts that are too small to be seen with typical ECL substrates.

WARNING: Cancer – www.P65Warnings.ca.gov
For Research Use Only. Not for use in diagnostic procedures.
Specifications
Product TypeSubstrate
Detection MethodChemiluminescence
FormLiquid
For Use With (Application)Western Blot
Membrane CompatibilityNitrocellulose, PVDF
Product LineSuperSignal™
Quantity200 mL
ConjugateHRP
SubstrateHorseradish Peroxidase
Recommended Antibody Concentrations2°: 1:100-500K (2-10ng/mL), 1°: 1:5K (10- 200ng/mL)
SensitivityLow femtogram-level
Signal Duration6 to 8 hr.
Sufficient For25 mini-gel blots, 2000 sq. cm of membrane
Kit ContentsStable Peroxide Buffer (100 mL), Luminol/Enhancer (100 mL)
Unit SizeEach
Contents & Storage
Sufficient For: 25 mini-gel blots; 2000 cm2 of membrane
• Luminol/Enhancer, 100 mL
• Stable Peroxide Buffer, 100 mL

Store reagents at 4°C.

Frequently asked questions (FAQs)

What types of membrane work best with SuperSignal West Femto Maximum Sensitivity Substrate?

Most researchers use nitrocellulose or polyvinyldiflouride (PVDF) membranes with SuperSignal West Femto Maximum Sensitivity Substrate. Both work well, although nitrocellulose seems to be better suited in some applications than PVDF. In addition, charge-modified nylon membrane performs well with this substrate. Please also see our guide for choosing western blot membranes (https://www.thermofisher.com/us/en/home/life-science/protein-biology/protein-assays-analysis/western-blotting/transfer-proteins-western-blot/membranes-transfer-buffers-western-blotting/membranes-western-blotting.html).

Find additional tips, troubleshooting help, and resources within our Protein Electrophoresis and Western Blotting Support Center.

Will SuperSignal West Femto Maximum Sensitivity Substrate work with nucleic acid blots (Southern blotting, etc.)?

Yes. However, SuperSignal West Femto Maximum Sensitivity Substrate was optimized for use in Western blot sand is generally not sensitive enough for most nucleic acid protocols. For Southern and Northern blotting, use our North2South Chemiluminescent Nucleic Acid Hybridization and Detection Kit (Cat. No. 17097), North2South Chemiluminescent Substrate for HRP (Cat. No. 17295), or the Chemiluminescent Nucleic Acid Detection Kit, if probing for biotinylated probes (Cat. No. 89880).

Find additional tips, troubleshooting help, and resources within our Protein Electrophoresis and Western Blotting Support Center.

I used the SuperSignal West Femto Maximum Sensitivity Substrate. Why is the entire film black or showing a reversed image?

The antibody concentration (primary and secondary) is too high. Use the antibody dilutions described in the product instructions. Most background will disappear when the proper blocking reagent and a HRP conjugate concentration are used.

Find additional tips, troubleshooting help, and resources within our Protein Electrophoresis and Western Blotting Support Center.

Why do I see more bands with the SuperSignal West Femto Maximum Sensitivity Substrate than I've seen in the past with other substrates?

Because this substrate is more sensitive than other chemiluminescent substrates you might detect low-abundance proteins that were not visible before. When using a more sensitive substrate, more careful optimization of blocking buffer steps and antibody concentrations is required.

Find additional tips, troubleshooting help, and resources within our Protein Electrophoresis and Western Blotting Support Center.

What protocol should I use to strip and reprobe a blot detected with SuperSignal West Femto Maximum Sensitivity Substrate ?

See Tech Tip # 23: Strip and reprobe Western blots.

Find additional tips, troubleshooting help, and resources within our Protein Electrophoresis and Western Blotting Support Center.