DBCO-PEG4-NHS Ester is a click chemistry PEG reagent containing NHS ester that is able to react specifically and efficiently with primary amines (e.g. the side chain of lysine residues or aminosilane-coated surfaces) at neutral or slightly basic condition to form a covalent bond. The hydrophilic PEG spacer arm improves water solubility and provides a long and flexible connection that minimizes steric hindrance involved with ligation. DBCO is commonly used for copper-free Click Chemistry reactions. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.
DBCO-PEG4-NHS Ester is a click chemistry PEG reagent containing NHS ester that is able to react specifically and efficiently with primary amines (e.g. the side chain of lysine residues or aminosilane-coated surfaces) at neutral or slightly basic condition to form a covalent bond. The hydrophilic PEG spacer arm improves water solubility and provides a long and flexible connection that minimizes steric hindrance involved with ligation. DBCO is commonly used for copper-free Click Chemistry reactions. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.
Usages：
For determination of coliform confirmatory test for multi-tube fermentation.
Principle:
Peptone provide carbon and nitrogen sources; lactose as fermentable sugars; ox bile powder and brilliant green inhibit the non-Enterobacteriaceae.
Formulation (per liter):
Peptone: 10g
Lactose: 10g
Ox bile powder: 20g
Brilliant green: 0.0133g
Final pH7.2 ± 0.2
How to use:
1.Suspend 40g of the product, add 1 L of distilled water, stirring heated to boiling until completely dissolved, packed in a test tube with a small inverted tube, autoclave at 121 ℃ for 15min, cool to room temperature and set aside.
2.Sample handling and dilution. Slightly.
3.Transplanted LST broth tube to brilliant green lactose bile broth tube by using a inoculating loop.
4.the tube was placed in an incubator culture at 36 ± 1 ℃ for 24h.
5.Observe the results. Press production trachea number, check table report MPN MPN value per gram (mL) sample of coliform bacteria.
Quality control:
Quality control strains were inoculated and culuture at 36 ± 1 ℃ for 24h ,results are as follows:
Bacterial Name Bacterial No. Growth Status Gassing
Escherichia coli ATCC25922 good +
Salmonella typhimurium CMCC (B) 50115 good —
Staphylococcus aureus ATCC6538 inhibited —
Storage: Store in a dark, cool and dry place, tighten the cap immediately after use. Storage period of three years.
Specifications: 250g/bottle
250g
Norgen’s Stool Nucleic Acid Collection and Preservation Devices Dx are designed for the collection and preservation of nucleic acids from fresh stool specimens. The Stool Nucleic Acid Collection and Preservation Devices Dx – 50 contains 50 individual Stool Nucleic Acid Collection and Preservation Devices Dx. Each Stool Nucleic Acid Collection and Preservation Device Dx consists of Norgen’s Stool Nucleic Acid Collection and Preservation Tube Dx containing Norgen’s Stool Preservative in a liquid format. The user simply collects stool into the tubes (fill up to the line indicated on the tube) and mixes gently until the stool is well submerged under the preservative. The Stool Nucleic Acid Collection and Preservation Tube Dx is subsequently sent to the laboratory for DNA and/or RNA isolation and analysis. The stool DNA in preserved samples is stable for more than 2 years at room temperature, and the stool RNA in preserved samples is stable for 7 days at room temperature. DNA can be isolated from the preserved stool samples using Norgen’s Stool DNA Isolation Kit Dx (Cat. Dx27600) and RNA can be isolated from the preserved stool samples using Norgen’s Stool Total RNA Purification Kit Dx (Cat. Dx49500). These tubes are ideal for collecting and preserving DNA and RNA samples for in vitro diagnostic use for medical purposes.
NOTE: This product is not available for sale in the United States.
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| Kit Specifications | |
| Stool Input | 2 g |
| Stability of Stool Nucleic Acids at Room Temperature | 2 years for DNA 7 days for RNA* |
* The RNA stability will be vary depending on the samples
Stool Nucleic Acid Collection and Preservation Devices Dx – 50 Contents:
| Kit Components | Cat. Dx45660 |
|---|---|
| Stool Nucleic Acid Collection and Preservation Devices Dx | 50 |
| Product Insert | 1 |
Stool Nucleic Acid Collection and Preservation Device Dx Contents:
| Kit Components | Contents |
|---|---|
| Stool Nucleic Acid Collection and Preservation Tube Dx filled with preservative | 1 |
| Insert Card | 1 |