Intended Use For the selective isolation and culture of Listeria monocytogenes. Principle and Interpretation Peptone provides the carbon and nitrogen sources necessary for growth; yeast ex……
Detail
Introduction
Intended Use
For the selective isolation and culture of Listeria monocytogenes.
Principle and Interpretation
Peptone provides the carbon and nitrogen sources necessary for growth; yeast extract powder and starch provide carbon and nitrogen sources, vitamins and growth factors; sodium chloride can maintain a balanced osmotic pressure; glucose provides a carbon source; Listeria hydrolyzes esculin and reacts with iron ions to form black 6,7-dihydroxycoumarin; mannitol is a fermentable sugar, and phenol red is a pH indicator; lithium chloride and other antibiotics can inhibit Gram-negative bacteria and most Gram-positive bacteria; agar is the coagulant of the culture medium.
Formulation
Ingredients
/liter
Peptone
23 g
Starch
1 g
NaCl
5 g
Columbia agar
13 g
Mannitol
10 g
Ferric ammonium citrate
0.5 g
Esculin (aesculin)
0.8 g
Dextrose (glucose)
0.5 g
Lithium chloride
15.0 g
Phenol red
0.08 g
pH7.2±0.2 at 25°C
Preparation
Weigh 68.9g of dry powder of this product, add 1L of distilled water or deionized water, stir, heat and boil until completely dissolved, divide into Erlenmeyer bottles, sterilize at 121℃ for 15min, cool to room temperature and set aside. Heat to dissolve agar before use, cool to 50℃, add 1 tube of supporting reagent (SR0140) per 100mL of basal culture medium, shake well and pour into sterilized culture dish.
Quality Control
The following quality control strains were inoculated and cultured at 35-37℃ for 24h. The results are as follows:
Quality control strains
Growth
Listeria monocytogenes ATCC19115
Gray-green colonies with a black depression in the center and black surrounding
Enterococcus faecalis ATCC29212
–
Escherichia coli ATCC25922
–
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.
Other Products
Mini-7 laboratory centrifuge
Product Info
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Product Info
Mini-7 laboratory centrifuge
Features of Mini-7 laboratory centrifuge
1. Mini-7 centrifuge is widely used in laboratory and hospital.
2. This model can fit in 2ml, 1.5ml, 0.5ml and 0.2ml tubes. 3. Light weight, small size and beautiful design. 4. Easily control, super speed protection.
Mini-7 Technical Data
Max speed
7000rpm
Volume
6×0.2ml
6×0.5ml
6×1.5ml
6x2ml
8x2x0.5ml
Speed accuracy
≦±1%
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mini centrifuge also called palm centrifuge, we can supply mini centrifuge from 4000rpm to 12000rpm, also we have mini centrifuge with digital display.
Buffer system mainly for stabilizing protein/enzyme and performance
B buffer
0.15ml
1 Tube
Mainly activated systems such as magnesium ions
Positive control template
0.1ml
1 Tube
Mainly the positive plasmid template is used to test the effectiveness of the kit
Positive control primer mix
0.06ml
1 Tube
Mainly the primer combination of the positive control template
Reagent Guide Manua
16T/bags,48T/Box
3 bags
Reagent technology of protein/enzyme system: freeze-dried powder, freeze-dried microspheres
Principle overview
This kit is based on a room temperature and constant temperature nucleic acid rapid amplification technology: at room temperature and constant temperature, the recombinase and primer form the protein/single-stranded nucleotide complex Rec/ssDNA, with the help of auxiliary proteins and single-stranded binding protein SSB , invade the double-stranded DNA template; form a D-loop region at the invasion site, and start scanning the DNA double-strands; after finding the target region complementary to the primer, the Rec/ssDNA complex disintegrates, and the polymerase also binds to The 3′ end of the primer initiates chain extension. This kit relies on the action of exonuclease at 39 ºC, adding specific molecular probes designed based on the template, and using fluorescence monitoring equipment to achieve real-time monitoring of the amplification process of the target fragment.
Primer design
It is recommended to use primers with a length of 30-35 bp. Primers that are too short will affect amplification speed and detection sensitivity; primers are designed to avoid the formation of secondary structures that affect amplification; the amplicon length is recommended to be 150-300 bp, usually no more than 500 bp.
Fluorescent probe design
The probe sequence does not overlap with the specific primer recognition site, is 46-52 nt in length, and the sequence avoids palindromic sequences, internal secondary structures, and continuous repeated bases. The probe has four modification sites: the middle position ≥ 35 nt from the 5′ end is labeled with a dSpacer (tetrahydrofuran, THF) as the recognition site for exonuclease; the upstream of the THF site is labeled with a fluorescent group, and the downstream Label a quenching group, the distance between the two groups is 2-4 nt; THF is ≥15 nt from the 3′ end, and the 3′ end is labeled with a modifying group, such as an amine group, a phosphate group or a C3-Spacer.
Product features and advantages:
This kit has the advantages of high sensitivity, strong specificity,and short reaction time (only 20 minutes), and the reaction groups are in dry powder state, which is easy to operate and easy to store.
It can be applied to various brands of fluorescence quantitative PCR instruments, constant temperature fluorescence amplification instruments and other fluorescence detection equipment.
Document
This kit is based on a room temperature and constant temperature nucleic acid rapid amplification technology: at room temperature and constant temperature, the recombinase and primer form the protein/single-stranded nucleotide complex Rec/ssDNA, with the help of auxiliary proteins and single-stranded binding protein SSB , invade the double-stranded DNA template; form a D-loop region at the invasion site, and start scanning the DNA double-strands; after finding the target region complementary to the primer, the Rec/ssDNA complex disintegrates, and the polymerase also binds to The 3′ end of the primer initiates chain extension. This kit relies on the action of exonuclease at 39 ºC, adding specific molecular probes designed based on the template, and using fluorescence monitoring equipment to achieve real-time monitoring of the amplification process of the target fragment.
DBCO-PEG4-triethoxysilane is a PEG linker containing a triethoxysilane moiety and a DBCO group. Triethoxysilane is commonly used for surface modifications. DBCO group can react with azide-bearing compounds or biomolecules to form a stable triazole linkage without copper catalyst. The hydrophilic PEG chain increasse the water solubility of a compound in aqueous media. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.
Document
DBCO-PEG4-triethoxysilane is a PEG linker containing a triethoxysilane moiety and a DBCO group. Triethoxysilane is commonly used for surface modifications. DBCO group can react with azide-bearing compounds or biomolecules to form a stable triazole linkage without copper catalyst. The hydrophilic PEG chain increasse the water solubility of a compound in aqueous media. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.
