Propargyl-PEG13-acid consists of an alkyne group and a carboxylic acid. The carboxylic acid reacts with amine groups to form amide bonds in the presence of EDC or HATU as an activator. The alkyne group is commonly used in copper catalyzed azide-alkyne Click Chemistry reactions. The hydrophilic PEG units enhance the solubility of the molecule in aqueous media. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.
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Propargyl-PEG13-acid consists of an alkyne group and a carboxylic acid. The carboxylic acid reacts with amine groups to form amide bonds in the presence of EDC or HATU as an activator. The alkyne group is commonly used in copper catalyzed azide-alkyne Click Chemistry reactions. The hydrophilic PEG units enhance the solubility of the molecule in aqueous media. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.
DBCO-PEG24-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.
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DBCO-PEG24-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 differentiating enteric bacteria based on urease activity by adding 40% sterile urea solution.
Principle: Peptone provides the carbon and nitrogen; maintain a balanced osmotic sodium chloride; potassium dihydrogen phosphate is buffers; decomposing bacteria urease urea medium, produce large amounts of ammonia, agar as medium coagulant.
Formulation (per liter): Peptone 1g Sodium chloride 5g Glucose 1g Ppotassium dihydrogen phosphate 2g Phenol red 0.012g Agar 12g Final pH7.2 ± 0.2
How to use: 1.Suspend 21g in 1L 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. cooling to 50-55 and adding 40% urea solution. 2.Diluted and treated samples.
Storage: Store in a dark, cool and dry place, tighten the cap immediately after use. Storage period of three years.