FAQ: BioFX Products

Table of Contents 

General Questions

What kind of tubing is recommended for filling?

Platinum Cured Silicone or C-flex tubing is recommended. One time use is highly recommended.

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Chemiluminescent AP Microwell and/or Membrane Substrates

What systems can be used and what is the dynamic range of the AP Chemiluminescent Substrates?

The Chemiluminescent AP Substrates can be used in automatic or manual systems with a wide dynamic range (5 to 6 log dynamic range).

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What wash is best suited for membrane applications?

Wash membrane with 0.2 M Tris buffer, pH 7.0 to 7.5 prior to substrate use.

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What kind of blocking reagents are recommended?

Only use blocking reagents that are uncontaminated with residual alkaline phosphatase and toxin free.

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Microwell ELISA Substrates - Peroxidase Enzyme Systems - ABTS

What is the recommended stop solution for ABTS?

BioFX Catalog number ABSS can be used to stop the reaction. 1% of sodium dodecyl sulfate can also be used.

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What is the maximum absorbance value for monitoring and reading the ABTS?

Sample absorbance values should be monitored and read before absorbance values exceed 2.0 OD units.

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ABTS - How can the reaction be slowed?

To reduce or adjust the intensity of the reaction optimization of the antibody or conjugate is suggested.

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Microwell ELISA Substrates - Peroxidase Enzyme Systems - TMB

What is the maximum absorbance value for monitoring and reading the TMB Substrates?

Sample absorbance values should be monitored and read before absorbance values exceed 2.0 OD units.

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Can the TMB Substrates be diluted?

Dilution of the substrates is not recommended. To reduce the intensity of a reaction, it is recommended that the antibodies or conjugates be diluted.

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How can the intensity of the reaction be reduced?

To reduce the intensity of a reaction, it is recommended that the antibodies or conjugates be diluted.

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What stop solutions are recommended?

BioFX catalog numbers STPR, LSTP, BSTP, and LBSP are recommended. 1 N HCL and 0.6 N sulfuric acid can also be used.

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What solvent is used in TMB Substrates?

A proprietary non-toxic, non-hazardous, non-carcinogenic solvent is used in the TMB Substrates

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Will the TMB substrates freeze when stored at 2°C to 8°C?

No.

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How can the reaction be slowed?

To reduce or adjust the intensity of the reaction optimization of the antibody or conjugate is suggested.

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What is the difference between TMBC and TMBW?

TMBC is a system electrically controlled to generate a focused positive charge to a computer chip. Chelated metals in the TMBC make it possible to determine the conductivity and salinity of the substrate.

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What is the conductivity of the TMBC?

The conductivity of the TMBC is greater than or equal to 1500µS/cm.

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How much less sensitive is the TMSK compared to the TMBW?

The TMSK is approximately 25% less sensitive than the TMBW.

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How much less sensitive is the TTMB compared to the TMBW?

The TTMB is approximately 35% less sensitive than the TMBW.

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How much less sensitive is the TMDS compared to the TMBW?

The TMDS is approximately 60% less sensitive than the TMBW.

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How much more sensitive is the TMBS compared to the TMBW?

The TMBS is approximately 40% more sensitive than the TMBW.

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What are the Extinction Coefficients for TMBP?

E288.5 = 23,497 / E212 = 48,231 (c = 0.00447g/l in EtOH)

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Is TMBP soluble in water?

No. Most end users dissolve TMBP in organic solvents such as DMSO and DMF.

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Microwell ELISA Substrates - Alkaline Phosphatase Enzyme Systems

PNPS (pNPP Substrate) - Can the stabilizing pellets be removed?

The removal of stabilizing pellets is not recommended.

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At what range is the PNPS read?

The PNPS (pNPP substrate) can be read in the range of 405 nm to 420 nm.

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What stop reagent is recommended for PNPS?

BioFX catalog number APSR can be used. 50 µl of 3 N NaOH per 200 µl of PNPS can also be used.

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At what range is the APBS read?

The APBS is capable of being read in the range of 490 nm to 650 nm.

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APBS / APRS - How soon should the mixed reagent be used?

The mixed reagent must be used within 60 minutes.

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APBS / APRS - What Stop reagent is recommended for APBS Microwell applications?

BioFX catalog number APSR can be used to stop the APBS.

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APBS / APRS - How do you stop the reaction in membrane applications?

To stop the reaction, rinse the membrane with reagent quality water.

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At what range is the APRS read?

The APRS is capable of being read in the range of 450 nm to 550 nm.

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Membrane Substrates - Peroxidase Enzyme Systems

DABM - How long is the solution stable after combining the components?

Following the combination of the two components, the resulting 1X solution is stable for 2 - 4 hours at 25°C and up to 8 hours at 2°C to 8°C.

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DABM - How is the reaction stopped?

Stop the reaction by gently rinsing the stained membrane in 2 - 3 changes of distilled water.

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TMBM / SPPM - How is the reaction stopped?

To stop the reaction, rinse the membrane with reagent quality water.

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TMBM / SPPM - Is it recommended to dilute the substrate?

Dilution of the substrate is not recommended. To reduce the intensity of a reaction, it is recommended that the antibodies or conjugates be diluted.

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TMBM / SPPM - There appears to be flocculent material in the substrate. Will this affect the performance?

The presence of flocculent material will not affect product performance.

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Membrane Substrates - Alkaline Phosphatase Systems

APMM - After combining the components, how long should I allow the product to incubate?

Use substrate immediately after combining the components.

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APMM - How long is the product stable for after combining the components?

The solution is stable for up to 1 hour. Some color and turbidity may develop over this period that does not affect product performance.

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BCIB / BCID - How is the reaction stopped?

To stop the reaction, rinse the membrane with reagent quality water.

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Can BCIB or BCID be used for immunohistochemical applications?

These products are not recommended for immunohistochemical applications.

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Immunohistochemical Substrates - Eosinophil Staining System

Can the EoProbe signal be seen with brightfield and under fluorescence?

The EoProbe signal can be seen with both brightfield and under fluorescence.

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What filters should be used for fluorescence with EoProbe?

Fluorescence should be performed with an excitation filter of 510 - 590 nm, dichroic mirror of 580 nm and a barrier filter of 590 nm.

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Can the EOPB be used for flow cytometry?

The EOPB is not recommended for flow cytometry applications even though automated cyto-imaging systems can be used.

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EOPB - What is recommended for mounting?

BioFX catalog number FLPM is recommended for mounting.

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EOPB - How long should continuous photoexcitation be used?

Continuous photoexcitation should be used for at least a minute in order to photobleach all nonspecific autofluorescence.

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Immunohistochemical Substrates - Peroxidase Enzyme Systems

DABI - How long is the solution stable after combining the components?

Following the combination of the two components, the resulting 1X solution is stable for 2 - 4 hours at 25°C and up to 8 hours at 2°C to 8°C.

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DABI - How is the reaction stopped?

Stop the reaction by gently rinsing the stained membrane in 2 - 3 changes of distilled water.

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DABI - What is an appropriate counterstain?

Counterstain the section with hematoxylin or methyl green.

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Immunohistochemical Substrates - Phosphatase Enzyme Systems

How long is the APNM stable after combining all of the components?

The solution is stable for up to 1 hour but some color and turbidity may develop over this period that does not affect product performance.

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What is an appropriate counterstain for APNM?

Both hematoxylin and methyl green are appropriate counterstains.

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APNM - What should be used to dehydrate the section?

Dehydrate section in alcohol or another organic solvent and clear in xylene.

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Fluorescent Preserving Media

Does the FLPM contain p-phenylediamine?

No.

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FLPM - When should the specimen be evaluated?

After target specimen is covered with FLPM and a coverslip, evaluate specimen as soon as possible.

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Immunohistochemical - Immunopathology Blocks

Can the APHP be used to block AP enzymatic activity?

The APHP blocks both alkaline phosphatase and peroxidase endogenous enzymatic activity.

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Non Fat Dry Milk (NFDM) Block / Diluent

How can the NFDM blocks be used as a diluent for antigens and antibodies?

The MLKB can serve as a diluent for antigens and antibodies when diluted in a 4% solution of glycerol.

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How does the NFDM block act as a blocking reagent?

As a blocking reagent, the solution binds to the secondary protein binding sites following the binding of the primary antigen or antibody to the solid phase surface.

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Borate Buffered Saline Casein Blocks and Diluents

Tris Buffered Saline Casein Block and Diluent

In what cases is TBSC preferred over PBSC?

To avoid complex formation with ionic species such as calcium and magnesium in blood, Tris buffers are preferable over phosphate buffers.

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For how long should plates be incubated?

When using 1X solution for coating plates, best results are obtained following an overnight incubation at 2°C - 8°C.

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What is the optimal pH range for diluted TBSC?

The optimal pH range for diluted TBSC is 7.4 - 7.8 at 22°C to 28°C.

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Phosphate Buffered Saline Casein Block and Diluent

Can PBSC be used with other phosphate groups?

PBSC should not be used in assays where there is a competition for phosphate groups, if complex formulations with metal ions are essential for the enzyme activation.

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PBSC - For how long should plates be incubated?

When using 1X solution for coating plates, best results are obtained following an overnight incubation at 2°C - 8°C.

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What is the optimal pH range for diluted PBSC?

The optimal pH range for diluted PBSC is 7.2 - 7.6 at 22°C to 28°C.

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PBSC - What will phosphate ions inhibit?

Phosphate ions will inhibit carboxypeptidiase, carboxylas, urease, muscle diaminase, formase, and phosphoglucomutase.

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ELISA Reagents, Washing Solution

Do the wash solutions contain Tween 20?

The solutions contain 0.5% Tween 20, which has no net charge to interfere with assay reactants.

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ELISA Substrate Stopping Solutions

Why is STPR recommended over other acids for stopping TMB?

STPR reacts more slowly, is less volatile and does not form corrosive hydrogen chloride.

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STPR - How long is the stabilization of the reaction product?

At least one hour.

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What is the UN Packaging Group classification for STPR?

Classification III - mildly corrosive with a time of 55 minutes.

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What does your STPR contain?

A proprietary Amphipathetic blend containing alpha and beta unsaturated Carbonyl compound.

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How long is the STPR stable?

Prior to hydration with water, the STPR is stable indefinitely. Following hydration, the reagent is stable for a minimum of 3 years from the date of reconstitution when stored at 25°C.

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What is the UN Packaging Group classification for LSTP?

Classification III - mildly corrosive with a time of 55 minutes

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LSTP - How long is the stabilization of the reaction product?

At least one hour.

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What does your LSTP contain?

A proprietary Amphipathetic blend containing alpha and beta unsaturated Carbonyl compound.

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What does the BSTP contain?

The BSTP is a proprietary dry blend.

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How long is the BSTP stable?

Prior to hydration with water, the BSTP is stable indefinitely. Following hydration, the reagent is stable for a minimum of 3 years from the date of reconstitution when stored at 25°C.

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BSTP - Will it harm the product if stored at 2°C to 8°C?

Refrigerated temperatures will not harm the reagent.

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LBSP - Will it harm the product if stored at 2°C to 8°C?

Refrigerated temperatures will not harm the reagent.

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What is the pH of the LBSP?

The pH of the LBSP is 7.5 - 11.5.

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What does the ABSS contain?

The ABSS is a proprietary dry blend.

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How long is the ABSS stable?

Prior to hydration with water, the ABSS is stable indefinitely. Following hydration, the reagent is stable for a minimum of 3 years from the date of reconstitution when stored at 25°C.

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How long is the ABSS stable for after hydration?

The reagent is stable for 3 years following hydration.

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How much hydrated APSR is to be used?

Use 50 µl of AP Stop Reagent per 200 µl of APRS and APBS, use equal volumes of APSR and PNPS.

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How long is the APSR stable?

Prior to hydration with water, the APSR is stable indefinitely. Following hydration, the reagent is stable for a minimum of 3 years from the date of reconstitution when stored at 25°C.

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Phosphatase and Horseradish Peroxidase Block

APHP - How long should samples be blocked?

Samples should be blocked for a minimum of 10 minutes at 25°C.

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Blocking Buffers

How long should the buffer incubate?

Incubate a minimum of 3 hours.

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Do the blocking buffers contain preservatives?

Antimicrobial agents have been added to retard bacterial growth and are not considered corrosive at the concentration supplied.

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APHP - How long should samples be blocked?

Samples should be blocked for a minimum of 10 minutes at room temperature. Additional blocking time may be required depending on tissue thickness and sample penetrability.

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Can the APHP be used to block both HRP and AP endogenous enzymatic activity?

Yes.

 

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