DBCO-TFP ester

endo-BCN-PNP-carbonate is a very reactive compound which can easily react with amine-containing molecules in organic solvents. PNP is a good leaving group. The BCN is used for copper-free Click Chemistry reactions. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.

endo-BCN-PNP-carbonate is a very reactive compound which can easily react with amine-containing molecules in organic solvents. PNP is a good leaving group. The BCN is used for copper-free Click Chemistry reactions. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.

Introduction

Intended Use

For selective enrichment culture of Listeria monocytogenes in food.

Principle and Interpretation

Tryptone, proteose peptone, meat extract, yeast paste powder provide nitrogen sources, vitamins, amino acids, and growth factors; sodium chloride can maintain a balanced osmotic pressure; sodium dihydrogen phosphate and potassium dihydrogen phosphate as buffering agents; esculin are fermentable sugars; lithium chloride and other antibiotics can inhibit Gram negative bacteria and most Gram positive bacteria.

Formulation

Ingredients	/liter
Enzymatic digest of animal tissues　( Proteose peptone)	5.0g
Enzymatic digest of casein　( Tryptone)	5.0g
Meat extract	5.0g
Yeast extract	5.0g
Sodium chloride	20.0g
Disodium hydrogen phosphate dihydrate	12.0g
Potassium dihydrogen phosphate	1.35g
Aesculin	1.0g
Lithium chloride	3.0g
pH7.2±0.2 at 25°C

Preparation

Suspend 57.4g in 1 L of distilled or deionized water. Heat with frequent agitation and boil to completely dissolve the powder. Distribute into flasks. Autoclave at 121℃ for 15 minutes. Cool to 45-50℃,aseptically add the contents of 1 vial of Fraser Selective Supplement (SR0120) to each 225 mL of base to prepare FB1 solution; Add one reagent (SR0130) to each100 mL of FB2 culture medium to prepare FB2 enrichment solution.

Quality Control

Cultural characteristics observed after incubation at 35-37°C for 46~50 hours

Quality control strains	Growth	Characteristics
Listeria monocytogenes ATCC19115 + Escherichia coli ATCC25922 + Enterococcus faecalis ATCC29212	>20 cfu  On PALCAM	Gray to black colony count with black halo
Escherichia coli ATCC25922	< 100 colonies on TSA	Inhibition
Enterococcus faecalis ATCC29212

Storage and Shelf Life

2-30℃，Keep container tightly closed, avoid direct sunlight.

Use before expiry date on the label.

 Precautions

1. When weighing the dehydrated medium, please wear masks to avoid causing respiratory system discomfort

2. Keep container tightly closed after using to prevent clumping.

Waste Disposal

Microbiological contamination was disposed by autoclaving at 121°C for 30 minutes.

Revision

On June 14, 2024

References

ISO 11290

Intended Use For selective enrichment culture of Listeria monocytogenes in food. Principle and Interpretation Tryptone, proteose peptone, meat extract, yeast paste powder provide nitrogen ……

Description 

The ExcelTaq™ 2X Q-PCR Master Mix (SYBR, ROX) is a ready-to-use reagent with all the essential components for quantitative real-time PCR (qPCR) except primers and template. The master mix features high sensitivity and high signal intensity when compared with Brand A. The ExcelTaq™ 2X Q-PCR Master Mix (SYBR, ROX) contains hot-start Taq polymerase in an optimized buffer with dsDNA specific SYBR green fluorescent dye. This master mix allows for sensitive and precise amplification, real-time tracking of the amplification process, and simultaneous quantification for targeted DNA molecules. The master mix includes ROX reference dye for normalization of each qPCR assay. With inert smart blue contrast dye, the ExcelTaq™ 2X Q-PCR Master Mix (SYBR, ROX) is ready-to-use and greatly reduces pipetting errors, while largely improving the reproducibility of the process. 

Features

• High sensitivity and signal intensity
• With ROX reference dye
• Smart blue contrast dye as a visual aid for reaction setup 
• Better compatibility for reverse transcription

Storage 

Protected from light.
Aliquot to avoid multiple freeze-thaw cycles.
-20°C for 12 months

The ExcelTaq™ 2X Q-PCR Master Mix (SYBR, ROX) is a ready-to-use reagent with all the essential components for quantitative real-time PCR (qPCR) except primers and template. The master mix features high sensitivity and high signal intensity when compared with Brand A. The ExcelTaq™ 2X Q-PCR Master Mix (SYBR, ROX) contains hot-start Taq polymerase in an optimized buffer with dsDNA specific SYBR green fluorescent dye. This master mix allows for sensitive and precise amplification, real-time tracking of the amplification process, and simultaneous quantification for targeted DNA molecules. The master mix includes ROX reference dye for normalization of each qPCR assay. With inert smart blue contrast dye, the ExcelTaq™ 2X Q-PCR Master Mix (SYBR, ROX) is ready-to-use and greatly reduces pipetting errors, while largely improving the reproducibility of the process.