Methyltetrazine-PEG4-DBCO is a PEG linker with a terminal TCO reactive reagent and a DBCO group. DBCO is commonly used for copper-free Click Chemistry reactions. Methyltetrazine can be used to convert azido-containing peptides or proteins into tetrazine-modified peptides or protein without catalyst or axillary reagents. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.
Methyltetrazine-PEG4-DBCO is a PEG linker with a terminal TCO reactive reagent and a DBCO group. DBCO is commonly used for copper-free Click Chemistry reactions. Methyltetrazine can be used to convert azido-containing peptides or proteins into tetrazine-modified peptides or protein without catalyst or axillary reagents. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.
Usages:
For cultivations of yeasts , moulds and acidophilic bacteria.
Principle:
Peptone and yeast extract powder provides carbon and nitrogen sources and trace elements; lactose are fermentable sugars; sodium chloride maintains osmotic equilibrium; the 3rd bile salts and crystal violet inhibiting gram-positive bacteria, especially against Gram positive bacteria and fecal streptococci; neutral red as pH indicator.
Formulation(per liter):
Peptone 5g
Tryptone 5g
Glucose 20g
Final pH 5.7 ± 0.1
How to use:
1.Suspend 30g in 1 L of distilled water , stirring heated to boiling until completely dissolved, dispensing flask, 121 autoclave for 15min.
2.Diluted and treated samples.
Quality control:
| Item | The name and number of strain | Growth | Colony Color |
| 1 | Aspergillus niger ATCC16404 | Good | Spore surface growth |
| 2 | Candida albicans ATCC10231 | Good | Cloudy broth |
| 3 | Escherichia coli ATCC25922 | Inhibition | — |
Storage: Keep container tightly closed, store in a cool, dry place, away from bright light. Storage period of 3 years.
500g
Portable 4000rpm TD4C Centrifuge Machine for Lab, PRP & PRF
Application:
Widely used in the laboratory, hospital, clinic and so on.
Product Features:
1. Brushless motor, free maintenance, no powder pollution, quick in speed up and down.
2. Rang of speed from 0~4000rpm, smooth in operation, low noise and small vibration.
3. Micro-computer control system, digital display the RCF, time and speed.
4. Electric cover lock, compact design, super speed and imblance protection.
5. Small and portable, very convenient to use.
Technical Parameters:
| Max. Speed | 4000rpm | Speed Accuracy | ±20rpm | |
| Max.Volume | 8x20ml | Acc/Dec | 10 Kinds | |
| Max. RCF | 1880xg | Power Supply | AC110V/220V 50HZ/60HZ | |
| Timer | 0~99min | Noise | ≤55dBA | |
| Dimension | 310x270x220mm | Net Weight | 6.5Kg | |
| Warranty | 1 Year | Certifications | CE, ISO & Calibration report are available. |
Matched Rotors:
| Order No. | Rotor Type | Max.Speed(rpm) | Max.Volume(ml) | Max.RCF(xg) |
| 4C-1 | Angle Rotor | 4000 | 8x15ml/20ml | 1800/1840 |
| 4C-2 | Angle Rotor | 4000 | 6x10ml/15ml/20ml | 1790 |
| 4C-3 | Angle Rotor | 4000 | 12x5ml | 1540 |
| 4C-4 | Angle Rotor | 4000 | 12x10ml/7ml | 1792 |
| 4C-5 | Angle Rotor | 4000 | 8x10ml vacuum tube | 1790 |
| 8x5ml vacuum tube adapter | 1790 | |||
| 8x7ml vacuum tube adapter | 1790 |
For the detection of Salmonella spp. in food, animal feed and in environmental samples from the food production area as described in ISO 6579-1:2017.
Meat extract and casein provide a source of nitrogen and amino acids and sodium chloride maintain theosmotic balance. Ox bile and brilliant green act as selective agents against non-target microorganisms. Tetrathionate is generated from the sodium thiosulfate. Iodine and calcium carbonate buffer the sulfuric acid generated from tetrathionate reduction.
| Ingredients | /liter |
| Meat extract | 4.3g |
| Enzymatic digest of casein | 8.6g |
| Sodium chloride | 2.6g |
| Calcium carbonate | 38.7g |
| Sodium Thiosulfate (anhydrous) | 30.4g |
| Ox bile | 4.78g |
| pH8.0±0.2 at 25°C | |
Suspend 89.4g in 1 L of purified water. Heat with frequent agitation and boil to completely dissolve the powder. Distribute into flasks，and then cool to below 45°C. Add a vial of novobiocin sodium salt (SR0640), a vial of iodine solution and a vial of brilliant green (SR0040) into 100 mL of base medium. Mix thoroughly.
Cultural characteristics observed after incubation at 35-37°C for 24 hours
| Quality control strains | Approx. Inoculum(CFU) | Expected Results |
| Salmonella typhimurium ATCC14028 | 10 – 100 | ≥ 10 cfu on XLD |
| Escherichia coli ATCC25922 | > 104 | ≤100 cfu on TSA |
| Enterococcus faecalis ATCC29212 | > 104 | <10 cfu on TSA |
2-30℃，Keep container tightly closed, avoid direct sunlight.
Use before expiry date on the label.
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.
Microbiological contamination was disposed by autoclaving at 121°C for 30 minutes.
On June 14, 2024
ISO 6579:2017 Microbiology of food and animal feeding stuffs – Horizontal method for the detection, enumeration and serotyping of Salmonella spp.
Intended Use For the detection of Salmonella spp. in food, animal feed and in environmental samples from the food production area as described in ISO 6579-1:2017. Principle and Interpretation……
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